MST log search

2731 entries found

Number	9	A routine test of the MST Radar relays was conducted.
Start	2002-07-30 00:00
End	2002-07-30 00:00
Added	2002-07-30 00:00
Author	SJP

[Data]

Number	10	The hard-drive on the Master-PC, which controls the MST Radar, failed on 27th August. It was replaced almost immediately by the nominally identical Backup-PC and normal operations were resumed with only a minor loss of coverage. The working hard-drive on the Backup-PC has been cloned so that the PC can be repaired quickly in the event of another hard-drive failure. Tests have shown that the Backup-PC works with the cloned hard-drive. Although the Master and Backup PCs were supposed to be identical, there are slight differences between them which means that the Master-PC does not function correctly with the cloned hard-drive. Efforts to restore the Master-PC to working order are on-going. It is thought that the interface and network drivers will need to be reinstalled.
Start	2002-08-27 00:00
End	2002-08-27 00:00
Added	2002-08-27 00:00
Author	SJP

[Data]

Number	12	Communications with the radar site were briefly interrupted on 1st October when a hedge trimmer accidentally cut through telephone lines approximately 1 km away. Although telephone and computer connections were restored later the same day, the Met Office's ISDN line remained inoperative for approximately 24 hours.
Start	2002-10-01 00:00
End	2002-10-02 00:00
Added	2002-10-01 00:00
Author	ZKO

[Data]

Number	13	On 31st October maintenance work was carried out on the site PC, which logs surface data, in order to replace a failed fan unit..
Start	2002-10-31 00:00
End	2002-10-31 00:00
Added	2002-10-31 00:00
Author	ZKO

[Data]

Number	14	A routine test and replacement of faulty relays.
Start	2002-11-04 00:00
End	2002-11-04 00:00
Added	2002-11-04 00:00
Author	ZKO

[Data]

Number	15	The Met Office is currently phasing-in a new data acquisition system. During late November it was necessary to make changes to the programs which write the MST Radar data to BUFR files so that the header and footer codes were acceptable by the new system.
Start	2002-11-15 00:01
End	2002-12-11 00:00
Added	2002-11-15 00:00
Author	ZKO

[Data]

Number	16	The new UFAM mobile lidar system arrived at the MST Radar site on 18th November, approximately a month later than originally expected. The instrument will be operated at the site in-between field campaigns.
Start	2002-11-18 00:00
End	2002-11-18 00:00
Added	2002-11-18 00:00
Author	ZKO

[Data]

Number	17	A successful switch-over of BUFR file transmission to the new system was carried out on 11th December.
Start	2002-12-11 00:00
End	2002-12-11 00:00
Added	2002-12-11 00:00
Author	ZKO

[Data]

Number	18	The local electricity supplier shut down power to the Capel Dewi area on 17th December so that they could carry out scheduled maintenance work on their systems. The radar remained out of action for 7 hours.
Start	2002-12-17 00:00
End	2002-12-17 00:00
Added	2002-12-17 00:00
Author	ZKO

[Data]

Number	19	A brief power failure in the early morning of Saturday 28th December caused the radar system to crash. The problem was not noticed until the following day when Dave Wareing rebooted the radar control computer; ZAKO was on holiday at the time.
Start	2002-12-28 00:00
End	2002-12-28 00:00
Added	2002-12-28 00:00
Author	ZKO

[Data]

Number	20	The transmitter to which the others are phase-locked developed a fault around 1630 GMT on 12th January 2003, a Sunday. The problem wasn't noticed until first thing the following morning when the faulty transmitter was repaired, around 0930 GMT. The data for this period are unreliable.
Start	2003-01-12 16:30
End	2003-01-13 09:30
Added	2003-01-12 00:00
Author	ZKO

[Data]

Number	21	The radar remained out of action for approximately another 2 hours on the morning of 13th January to allow students from the Geography Department, University of Wales Aberystwyth, to measure the orientation of the MST Radar antenna array. This is the 3rd time that students have practised their surveying skills on the antenna array.
Start	2003-01-13 00:00
End	2003-01-13 00:00
Added	2003-01-13 00:00
Author	ZKO

[Data]

Number	27	The most significant problems experienced during the last six months have been caused by computer worms (MS-Blaster and subsequently Nachi-A) infecting theWindows2000 PC which controls the climate data logger; the Met Office had similar problems with their PC which collects GPS water vapour receiver data at the radar site. It should be noted that the data logger PC was running up to date anti-virus software, which was initially unable to remove the worms.
Start	2003-04-01 00:00
End	2003-10-16 00:00
Added	2005-08-01 16:23
Author	ZKO

[Data]

Number	26	A problem with the wind measuring equipment at Frongoch farm lead to a loss of surface wind data between 3rd and 14th April. At first it was thought that the anemometer had developed a fault and that it would need to be sent back to Campbell Scientific for repairs. A hand winch was purchased to enable the tower to be lowered to ground level for inspection. ZAKO traced the source of the problem to corrosion of an electrical connector between the wind measuring equipment and the data logging unit. He cleaned and then thoroughly resealed the connector in order to avoid a repetition of the problem.
Start	2003-04-03 00:00
End	2003-04-14 00:00
Added	2005-08-01 16:19
Author	ZKO

[Data]

Number	29	The JANET connection to the radar site suffered a temporary disruption on 16th June. The problem was found to be caused by a tree rubbing against the telephone cables approximately 1 km away. The JANET connection was restored later the same day.
Start	2003-06-16 00:00
End	2003-06-16 00:00
Added	2005-08-01 16:35
Author	ZKO

[Data]

Number	22	The programme of reconditioning the transmitter cooling blower motors has enabled the transmitters to be run at higher power than has been possible for some time. An increase of approximately 20% was introduced on 9th July and there are plans to gradually step this up in the near future.
Start	2003-07-09 00:00
End	2003-07-09 00:00
Added	2005-08-01 16:08
Author	ZKO

[Data]

Number	23	A problem developed on the radar receiver interface board at approximately 0600 UT on 19th July, i.e. on a Saturday morning. Consequently it was not noticed, and rectied, until the Monday morning leading to a loss of approximately 48 hours worth of data. The problem was thought to be caused by a static build-up associated with a thunder storm. There was a series of brief electricity supply interruptions around the same time which caused damage to pin diodes in 3 transmitters.
Start	2003-07-19 06:00
End	2003-07-21 09:00
Added	2005-08-01 16:10
Author	ZKO

[Data]

Number	28	ZAKO cleaned the tipping bucket raingauge on 25th July in order to remove a build-up of fungus which was obstructing the flow of rainwater through a narrow tube. The in-line filters are regularly cleaned as recommended by Campbell Scientific.
Start	2003-07-25 00:00
End	2003-07-25 00:00
Added	2005-08-01 16:34
Author	ZKO

[Data]

Number	24	a short circuit on one of the relay cables caused the radar beam steering unit to lock in one direction. The fact that this problem also developed on a Saturday morning meant that it was again almost 48 hours before it was rectified.
Start	2003-07-26 00:00
End	2003-07-28 09:00
Added	2005-08-01 16:17
Author	ZKO

[Data]

Number	25	The radar was down for approximately 10 minutes on 27th August after a minor disruption of the mains electricity supply to the site.
Start	2003-08-27 00:00
End	2003-08-27 00:00
Added	2005-08-01 16:17
Author	ZKO

[Data]

Number	38	Dr Prabhakaran Nayar, from the University of Kerala, India visited the radar site on 20th October 2003.
Start	2003-10-20 00:00
End	2003-10-20 00:00
Added	2005-08-01 16:52
Author	ZKO

[Data]

Number	32	A relay control unit, located within the antenna array, failed at around 1030 UT on 21st October 2003. The problem was fixed by 1240 UT on the same day.
Start	2003-10-21 10:30
End	2003-10-21 12:40
Added	2005-08-01 16:46
Author	ZKO

[Data]

Number	30	On 30th October 2003 changes were made to the standard mode observation specification. The main objective was to remove a 10 minute break in observations, which occurred approximately every 10 hours when the radar control software switched from one schedule to the next. The schedule length was also increased to approximately 27 hours in order to simplify the specification for continuous operations. The existing radar control and acquisition software is still optimised for making fixed duration observations and there are plans to upgrade it in the near future.
Start	2003-10-30 00:00
End	2003-10-30 00:00
Added	2005-08-01 16:38
Author	ZKO

[Data]

Number	36	MSc students from the Institute of Geography and Earth Sciences, UWA, visited the site on 6th November 2003. They measured the orientation of the MST radar antenna array as part of a surveying practical.
Start	2003-11-06 00:00
End	2003-11-06 00:00
Added	2005-08-01 16:49
Author	ZKO

[Data]

Number	33	The side panels of the power distribution box, which is also located within the antenna array, were replaced on 6th November 2003. The old panels had become rotten.
Start	2003-11-06 00:00
End	2003-11-06 00:00
Added	2005-08-01 16:47
Author	ZKO

[Data]

Number	34	NERC Site survey.
Start	2003-11-06 00:00
End	2003-11-06 00:00
Added	2005-08-01 16:48
Author	ZKO

[Data]

Number	31	The MST radar was operated in a user-specified mode for approximately 72 hours starting at 1300 UT on 7th November 2003. The main objective was to collect IQ data, which are not normally recorded.
Start	2003-11-07 13:00
End	2003-11-11 13:00
Added	2005-08-01 16:40
Author	ZKO

[Data]

Number	37	Between 19th November and 2nd December 2003, the UFAM (Universities Facility for Atmospheric Measurement) boundary-layer wind-profiler was away from the radar site. It was taken to Southampton to test whether it was likely to suffer interference from the proposed Galileo global positioning system. The latter will operate in the same frequency band as many wind-profilers.
Start	2003-11-19 00:00
End	2003-12-02 00:00
Added	2005-08-01 16:52
Author	ZKO

[Data]

Number	35	NERC asbestos check.
Start	2003-11-20 00:00
End	2003-11-20 00:00
Added	2005-08-01 16:48
Author	ZKO

[Data]

Number	40	Site manager away visiting the MO's new VHF wind-profiler at South Uist (Outer Hebrides) from 26th to 28th November 2003.
Start	2003-11-26 00:00
End	2003-11-28 00:00
Added	2005-08-01 16:54
Author	ZKO

[Data]

Number	39	Dr Adrian McDonald, from the University of Canterbury, New Zealand, visited the site on 12th December 2003.
Start	2003-12-12 00:00
End	2003-12-12 00:00
Added	2005-08-01 16:53
Author	ZKO

[Data]

Number	41	Members of the Health and Safety Committee of the RAL Space Science and Technology Department visited the radar site on 28th January 2004. They found no significant problems and made only minor recommendations for improvements.
Start	2004-01-28 00:00
End	2004-01-28 00:00
Added	2005-08-01 16:56
Author	ZKO

[Data]

Number	44	The MO's ISDN line to the radar site developed an intermittent fault on 5th February 2004. ZAKO identified and reported the problem to BT on the same day. Nevertheless the problem became persistent and the line was not restored to full working order until the 9th.
Start	2004-02-05 00:00
End	2004-02-09 00:00
Added	2005-08-01 16:59
Author	ZKO

[Data]

Number	45	The MO's ISDN line to the radar site developed an intermittent fault similar to the one reported on the 5th February 2004. recurred on 15th (once again ZAKO reported it to BT on the same day) and was fixed on the following day. BT confirmed that it had been caused by a battery failure at one of their exchanges.
Start	2004-02-15 00:00
End	2004-02-15 00:00
Added	2005-08-01 17:01
Author	ZKO

[Data]

Number	42	Fire officers from the UWA visited the site on 16th February 2004 to check the fire extinguishers. All were found to be in working order.
Start	2004-02-16 00:00
End	2004-02-16 00:00
Added	2005-08-01 16:57
Author	ZKO

[Data]

Number	46	The new UFAM mobile laboratory arrived at the radar site on 16th February 2004. It will be stored there in-between campaigns.
Start	2004-02-16 00:00
End	2004-02-16 00:00
Added	2005-08-01 17:02
Author	ZKO

[Data]

Number	43	ZAKO attended a NERC Safety Responsibility and Risk Management course in Swindon on 17th and 18th February 2004.
Start	2004-02-17 00:00
End	2004-02-18 00:00
Added	2005-08-01 16:57
Author	ZKO

[Data]

Number	47	On 16th March 2004, DAH, SJP and SJW visited the radar site to identify any outstanding Health and Safety issues and to format a Safety Document.
Start	2004-03-16 00:00
End	2004-03-16 00:00
Added	2005-08-01 17:02
Author	ZKO

[Data]

Number	48	Over the weekend of 20th March 2004, very high winds coincided with a relay fault in the high voltage section of the antenna array. Owing to the dangerous conditions, the relay could not replaced until the morning of 22nd.
Start	2004-03-20 00:00
End	2004-03-22 00:00
Added	2005-08-01 17:03
Author	ZKO

[Data]

Number	49	On 8th April 2004, a MANWEB (electricity company) employee failed to secure the handbrake on his van when posting a letter into the mail-box located just within the site gate. The van rolled forward and demolished a gatepost. MANWEB subsequently completely replaced the post.
Start	2004-04-08 00:00
End	2004-04-08 00:00
Added	2005-08-01 17:04
Author	ZKO

[Data]

Number	50	On 20th April 2004 the UFAM boundary-layer wind-profiler was taken to Weybourne to participate in the TORCH campaign.
Start	2004-04-20 00:00
End	2004-04-20 00:00
Added	2005-08-01 17:05
Author	ZKO

[Data]

Number	51	On 29th April 2004 Jonathan Jones (from the MO) replaced the computer for the GPS water vapour receiver.
Start	2004-04-29 00:00
End	2004-04-29 00:00
Added	2005-08-01 17:05
Author	ZKO

[Data]

Number	52	On 20th May 2004, the MST radar was stopped for several hours in order to allow ZAKO carry out a complete relay check and subsequent repairs.
Start	2004-05-20 00:00
End	2004-05-20 00:00
Added	2005-08-01 17:06
Author	ZKO

[Data]

Number	53	On 25th May 2004, the MST radar was stopped for several hours in order to allow ZAKO carry out a complete relay check and subsequent repairs.
Start	2004-05-25 00:00
End	2004-05-25 00:00
Added	2005-08-01 17:07
Author	ZKO

[Data]

Number	54	The MO's ISDN line developed a fault at 1330 UT on 1st June 2004. It was not rectified by BT until 1030 UT on the 3rd. The fault was found to be 3 miles away from the site.
Start	2004-06-01 13:30
End	2004-06-03 10:30
Added	2005-08-01 17:09
Author	ZKO

[Data]

Number	55	A new radar observation schedule was introduced on 21st June. Vertical beam observations are now made every other dwell. These high time resolution observations will be needed for convection, precipitation and Brunt-Vaisala period determination studies.
Start	2004-06-21 00:00
End	2004-06-21 00:00
Added	2005-08-02 13:07
Author	ZKO

[Data]

Number	56	A technical problem with the site security system resulted in a Police Rapid Response team being called to the site twice within a month - the second time on 28th June. The site was temporarily blacklisted by the Police, until Dyfed alarms retested the system and resolved the problem.
Start	2004-06-28 00:00
End	2004-06-28 00:00
Added	2005-08-02 13:07
Author	ZKO

[Data]

Number	60	ZAKO carried out work on the antenna array.
Start	2004-07-02 00:00
End	2004-07-02 00:00
Added	2005-08-02 13:17
Author	ZKO

[Data]

Number	61	ZAKO carried out work on the antenna array
Start	2004-07-03 00:00
End	2004-07-03 00:00
Added	2005-08-02 13:17
Author	ZKO

[Data]

Number	57	The locking transmitter went down at 0805 UT on (Sunday) 4th July. This caused the data to be unreliable until 0800 UT on (Monday) 5th, when ZAKO spotted and fixed the problem.
Start	2004-07-04 08:05
End	2004-07-05 08:00
Added	2005-08-02 13:09
Author	ZKO

[Data]

Number	62	ZAKO carried out work on the antenna array
Start	2004-07-10 00:00
End	2004-07-10 00:00
Added	2005-08-02 13:17
Author	ZKO

[Data]

Number	58	The MST radar was down for about 30 minutes on the afternoon of 12th July. This was to allow MANWEB to install a new electricity meter for the lidar hut.
Start	2004-07-12 00:00
End	2004-07-12 00:00
Added	2005-08-02 13:10
Author	ZKO

[Data]

Number	63	ZAKO carried out work on the antenna array
Start	2004-07-13 00:00
End	2004-07-13 00:00
Added	2005-08-02 13:18
Author	ZKO

[Data]

Number	59	The tipping bucket raingauge was cleaned on 19th July to clear fungus which was preventing the device from registering rain.
Start	2004-07-19 00:00
End	2004-07-19 00:00
Added	2005-08-02 13:11
Author	ZKO

[Data]

Number	64	The locking transmitter failed at around 2330 UT on 16th August causing the wind profile data to be unreliable. ZAKO fixed the problem by 0835 UT on the 17th.
Start	2004-08-16 23:30
End	2004-08-17 08:35
Added	2005-08-02 13:19
Author	ZKO

[Data]

Number	65	The radar was shut down at around 1235 UT on 18th August because of a fear of a lightning strike. The thunderstorms, which had persisted for much of the morning, soon cleared and normal operations were resumed at 1405 UT.
Start	2004-08-18 12:35
End	2004-08-18 14:05
Added	2005-08-02 13:20
Author	ZKO

[Data]

Number	67	Dyfed Alarms carried out a 6-monthly check on the site alarms, including the panic alarm, on 19th August.
Start	2004-08-19 00:00
End	2004-08-19 00:00
Added	2005-08-02 13:21
Author	ZKO

[Data]

Number	66	The high voltage unit on one of the transmitters failed on 19th August. The spare transmitted was substituted, so there was no loss of operations. The unit was fixed and returned to working order by 1400 UT.
Start	2004-08-19 00:00
End	2004-08-19 14:00
Added	2005-08-02 13:21
Author	ZKO

[Data]

Number	68	A buildings survey was carried out by NERC personnel on 24th August. NERC Health and Safety inspectors also visited the site on 25th. No serious problems were found.
Start	2004-08-24 00:00
End	2004-08-25 00:00
Added	2005-08-02 13:22
Author	ZKO

[Data]

Number	69	The tipping bucket raingauge had to be cleaned again on 25th August because of blockage by fungus.
Start	2004-08-25 00:00
End	2004-08-25 00:00
Added	2005-08-02 13:23
Author	ZKO

[Data]

Number	70	The locking transmitter failed at around 2200 UT on 7th September. This caused corrupt data to be sent to the Met Office for approximately 8 hours. The problem was spotted first thing on the morning of 8th by DAH and he was able to block the transmission of data to the Met Office. However, this was during a week when ZAKO was away on holiday and so it was not until 1200 UT that DaveWareing could switch the locking transmitter and normal operations were resumed. DAH restarted the transmission of data to the Met Office later in the afternoon, once he was satisfied that the radar was functioning correctly. ZAKO repaired the failed transmitter on 12th September, when he had returned from his holiday. DAH noted that although he had relevant pictures for the procedure of changing the locking transmitter, no documentation existed.
Start	2004-09-07 22:00
End	2004-09-08 12:00
Added	2005-08-02 13:26
Author	ZKO

[Data]

Number	71	ZAKO shut down the radar for approximately 20 minutes just after 1500 UT on 14th September. This was to allow him to check whether a problem with a relay unit had caused the failure of the locking transmitter on 7th. It wasn't.
Start	2004-09-14 15:00
End	2004-09-14 15:20
Added	2005-08-02 13:27
Author	ZKO

[Data]

Number	72	On 21st September ZAKO had to take action to remove a virus infection from the Logger PC.
Start	2004-09-21 00:00
End	2004-09-21 00:00
Added	2005-08-02 13:27
Author	ZKO

[Data]

Number	73	Jonathan Jones, from the Met Office, visited the site on 1st October in order to change the PC on the GPS water vapour receiver.
Start	2004-10-01 00:00
End	2004-10-01 00:00
Added	2005-08-02 13:28
Author	ZKO

[Data]

Number	74	An brief power outage caused the radar to stop at around 0726 UT on 4th October. ZAKO restarted the system immediately on arrival at site at 0755 UT. He also restarted the Met Office's GPS water vapour receiver PC.
Start	2004-10-04 07:26
End	2004-10-04 07:55
Added	2005-08-02 13:29
Author	ZKO

[Data]

Number	75	ZAKO cleaned out the tipping bucket raingauge on 7th October.
Start	2004-10-07 00:00
End	2004-10-07 00:00
Added	2005-08-02 13:29
Author	ZKO

[Data]

Number	76	A NERC audit officer visited the site on 14th October to check on matters relating to access and maintenance. She found that everything was in order and therefore considered her visit to have been a waste of time.
Start	2004-10-14 00:00
End	2004-10-14 00:00
Added	2005-08-02 13:30
Author	ZKO

[Data]

Number	77	At around 0845 UT on 19th October, a jumper failure on MANWEB's high voltage transmission system caused a power outage in the Capel Dewi area. Power did not return until 1505 UT. The radar was up and running again by 1515 UT.
Start	2004-10-19 08:45
End	2004-10-19 15:15
Added	2005-08-02 13:31
Author	ZKO

[Data]

Number	78	The radar was shut down around 1600 UT on 21st October because of fears of a lightning strike. There had already been power fluctuations which were causing problems for the radar. Thunder continued to be audible until midnight. The radar was restarted at 0715 UT on 22nd.
Start	2004-10-21 16:00
End	2004-10-22 07:15
Added	2005-08-02 13:32
Author	ZKO

[Data]

Number	79	ZAKO carried out winter preparations in the field (e.g. securing boxes and cables) on 28th and 29th October. This did not require the radar to be powered down.
Start	2004-10-28 00:00
End	2004-10-29 00:00
Added	2005-08-02 13:33
Author	ZKO

[Data]

Number	80	Approximately 10 people from the Ceredigion Amateur Radio Club visited the site from 6:30 - 9:30 pm on 11th November. They were very interested in the transmitters. A mention of their visit appeared in the Cambrian News.
Start	2004-11-11 18:30
End	2004-11-11 21:30
Added	2005-08-02 13:34
Author	ZKO

[Data]

Number	81	A Hercules aircraft flew very low over the radar site, from west to east, at around 1300 UT on 13th November.
Start	2004-11-13 13:00
End	2004-11-13 13:00
Added	2005-08-02 13:35
Author	ZKO

[Data]

Number	82	Two engineers from Anritsu visited the radar site on 15th November to demonstrate their hand-held cable and antenna analyser. The MST radar was shut down from approximately 1345 - 1715 UT in order to allow them to demonstrate the instrument's capabilities on various parts of the antenna system. However, the instrument was found to be not working properly.
Start	2004-11-15 13:45
End	2004-11-15 17:15
Added	2005-08-02 13:37
Author	ZKO

[Data]

Number	83	One of the transmitters went down at around 1445 UT on 17th November after its blower motor seized up. It was not possible to repair the transmitter, and return it to working order, until around 1230 UT the following day.
Start	2004-11-17 14:45
End	2004-11-18 12:30
Added	2005-08-02 13:38
Author	ZKO

[Data]

Number	84	A NERC buildings surveyor visited the site on 18th November in order to inspect the site bungalow and fence. He finished the survey around 1200 UT the following day.
Start	2004-11-18 00:00
End	2004-11-18 12:00
Added	2005-08-02 13:38
Author	ZKO

[Data]

Number	85	The radar was down from 1550 - 1605 on 18th November in order to allow ZAKO to carry out an inspection of the field boxes.
Start	2004-11-18 15:50
End	2004-11-18 16:05
Added	2005-08-02 13:39
Author	ZKO

[Data]

Number	86	ZAKO received a working cable and antenna analyser from Anritsu on 22nd November. The radar was down from 1100 - 1400 UT on the 23rd in order to allow him to test 30 of the 100 quads with the unit.
Start	2004-11-23 11:00
End	2004-11-23 14:00
Added	2005-08-02 13:41
Author	ZKO

[Data]

Number	87	Dave Wareing and EGN tried out the antenna analyser from Anritsu on the UFAM equipment on 24th. It was found to be useful in both cases. The Logger PC was used to download the field test data from the instrument. The use of the Logger PC in this way appears to have disrupted the normal collection of data from the Campbell Scientific instruments. This was not noticed, and rectified, until 30th November. Although this led to the loss of several day's worth of surface wind data, the surface met data appear to be complete.
Start	2004-11-24 00:00
End	2004-11-30 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	88	Students from the UWA Institute of Geography and Earth Sciences visited the site on 30th November in order to carry out their surveying practical. This required the radar to be shut down from approximately 1245 - 1545 UT.
Start	2004-11-30 12:45
End	2004-11-30 15:45
Added	2005-08-02 13:46
Author	ZKO

[Data]

Number	89	NERC carried out an electrical survey of the site bungalow on 15th December 2004. Recommendations for changes included replacing the existing storage heaters with gas or oil on-demand units, and possibly even recycling heat from the transmitters.
Start	2004-12-15 00:00
End	2004-12-15 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	90	The MO's GPS water vapour receiver PC was rebooted on 17th December.
Start	2004-12-17 00:00
End	2004-12-17 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	92	A fault caused the site alarm to go off at 07 UT on 24th December. Dyfed alarms changed a sensor in the lounge area.
Start	2004-12-24 07:00
End	2004-12-24 07:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	91	The MO's GPS water vapour receiver PC was rebooted on 29th December.
Start	2004-12-29 00:00
End	2004-12-29 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	93	A non-locking transmitter went down during the night of 3rd/4th January 2005. This was fixed by 09 UT on 4th January.
Start	2005-01-03 20:00
End	2005-01-04 09:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	94	The timber next to the smaller of the two site sheds was collected for disposal on 6th and 11th January.
Start	2005-01-06 00:00
End	2005-01-11 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	95	The new Anritsu cable testing unit arrived at the site on 12th January.
Start	2005-01-12 00:00
End	2005-01-12 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	96	TX1, the locking transmitter, failed at around 1200 UT on Friday 14th January. The problem was not spotted until the following evening (Saturday 15th). All transmitters were locked and working again by 1930 UT on 15th.
Start	2005-01-14 12:00
End	2005-01-15 19:30
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	97	A problem with the radar control PC caused observations to stop at around 08 UT on 22nd January (a Saturday). The problem was spotted by DAH first thing on the following Monday morning and normal operations resumed at around 10 UT.
Start	2005-01-22 08:00
End	2005-01-23 10:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	98	Some work was carried out in the field on 26th January. This did not require the radar to be shut down.
Start	2005-01-26 00:00
End	2005-01-26 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	99	A control cable to relay unit 21 developed a short circuit at around 0730 UT on 27th January. This caused the radar to malfunction until the cable was by-passed at around 0945 UT.
Start	2005-01-27 07:30
End	2005-01-27 09:45
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	100	TX2 was repaired on 15th February. It had been out of action since 7th February, when Dave Wareing received a burn from it whilst ZAKO was on leave.
Start	2005-02-07 00:00
End	2005-02-15 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	101	15th February. The PC controlling the MO's GPS water vapour receiver also required reboot.
Start	2005-02-15 00:00
End	2005-02-15 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	102	DAH and ZAKO attempted to remove worm infections from the Logger PC on 16th February. It appears that these infections were preventing the Sophos anti-virus software from updating. However, the infections proved hard to remove and so further action was delayed until the PC could be returned to RAL for a more thorough investigation.
Start	2005-02-16 00:00
End	2005-02-16 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	103	Katie Abbott, from NERC, visited the site on 22nd February in order to carry out a site survey.
Start	2005-02-22 00:00
End	2005-02-22 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	104	Field work was carried out on 23rd and 24th February. This did not require the radar to be powered down.
Start	2005-02-23 00:00
End	2005-02-24 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	105	UofWA fire officer visited the site on 28th February in order to carry out checks on the fire extinguishers. No problems were found.
Start	2005-02-28 00:00
End	2005-02-28 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	106	One of the non-locking transmitters was out of action between 11:45 and 12:45 UT on 1st March to allow work be carried out on it.
Start	2005-03-01 11:45
End	2005-03-01 12:45
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	107	Work on the relays was carried out on 2nd and 3rd March. This did not require any down time.
Start	2005-03-02 00:00
End	2005-03-03 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	108	The extractor fan seized on one of the transmitters at 08:50 UT on 4th March. It was switched off between 10:45 and 11:45 UT to allow a replacement be fitted.
Start	2005-03-04 08:50
End	2005-03-04 11:45
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	109	The MST radar was down 12:45 - 18:15 UT on 9th March to allow work to be carried out on the field relays.
Start	2005-03-09 12:45
End	2005-03-09 18:15
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	110	The MST radar was down 13:00 - 15:45 UT on 10th March to allow work to be carried out on the field relays.
Start	2005-03-10 13:00
End	2005-03-10 15:45
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	111	The surface met data logging unit, tipping bucket rain gauge and (faulty) humidity sensor were sent back to Campbell Scientific for recalibration and repairs on 11th March. The fact that the pressure sensor could not be found gave the first indication that it may have been stolen. At first it was thought that it had simply developed a fault.
Start	2005-03-11 00:00
End	2005-03-11 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	112	The MST radar was down 11:30 - 15:30 on 14th March to allow the replacement of some relays.
Start	2005-03-14 15:30
End	2005-03-14 15:30
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	113	The RAL cloud radar arrived at the MST site, direct from its recent field campaign in Mauritius, on 16th March.
Start	2005-03-16 00:00
End	2005-03-16 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	114	The MST radar was down for two brief periods, around 11:30 UT and around 15:30 UT, on 17th March to allow work to be carried out on the relays.
Start	2005-03-17 11:30
End	2005-03-17 15:30
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	115	There were a number of mains fluctuations during 18th March which caused problems for the MST radar: at around 09 UT, between 12:30 and 14:30 UT, and at around 15:20 UT. The radar was shut down again, just after 16 UT, to allow repairs be carried out in the field.
Start	2005-03-18 09:00
End	2005-03-18 16:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	117	31st March - The surface met data logger, and sensors, arrived back from Campbell Scientific.
Start	2005-03-31 00:00
End	2005-03-31 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	116	One of the MST radar transmitters went down at around 08:30 UT on 31st March, but was repaired by 09:15 UT.
Start	2005-03-31 08:30
End	2005-03-31 09:15
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	118	The data logger and met sensors (apart from the replacement pressure sensor) were reinstalled on 5th April.
Start	2005-04-05 00:00
End	2005-04-05 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	119	A new MST radar observation format was introduced on 6th April to allow a single vertical beam mesospheric observation to be made during each ST-mode cycle. At first an 8 mus pulse, with no pulse coding, was used. However, for some reason this caused the radar to operate in an unstable manner and so 2 mus coding was introduced on 7th. This solved the problem.
Start	2005-04-06 00:00
End	2005-04-07 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	120	DAH installed "Nero", the new WindowsXP data logging PC, on 13th April. The old PC was taken back to RAL for disinfection.
Start	2005-04-13 00:00
End	2005-04-13 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	121	The cut wires from the stolen original pressure sensor were discovered whilst DAH and ZAKO were replacing the new pressure sensor in the data logging box on 14th April.
Start	2005-04-14 00:00
End	2005-04-14 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	122	Peter Huggard and Tim Nightingale, from RAL, arrived on site on the afternoon of 14th April to set up the cloud radar. The instrument was in operation by the end of the day.
Start	2005-04-14 00:00
End	2005-04-14 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	123	The blower motor on one of the MST radar transmitters had disintegrated at some time on 16th April (a Saturday). This was discovered at 11:00 UT on 16th and the blower motor was replaced by 12:45 UT.
Start	2005-04-16 11:00
End	2005-04-16 12:45
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	124	The tipping bucket raingauge was cleaned out at 14:30 UT on 18th April.
Start	2005-04-18 14:30
End	2005-04-18 14:30
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	126	On 4th May ZAKO returned from holiday and by 08 UT the two MST radar transmitters which had been down since the 22nd April power disruptions were restarted.
Start	2005-04-22 00:00
End	2005-05-04 08:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	125	Mains interruptions caused the MST radar to stop working at around 14:00 UT on Friday 22nd April, whilst ZAKO was away on holiday. The problem was not spotted until first thing on Monday 25th April by DAH. Since the radar had come back up cleanly, DAH was able to restart data acquisition remotely at just after 08 UT.
Start	2005-04-22 14:00
End	2005-04-25 08:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	127	On 5th May ZAKO discovered that the new pressure sensor had been stolen. This was reported to the Police who came out immediately. Dave Wareing discovered a hole in the security fence (on the stretch running parallel to the road) on 9th May. The Police re-visited the site on 10th May.
Start	2005-05-05 00:00
End	2005-05-10 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	128	The grass was cut on 12th May.
Start	2005-05-12 00:00
End	2005-05-12 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	129	A mains disruption at around 12 UT on 20th May caused an exceptional amount of damage. Two of the transmitters were out of action and a chip blew on the antenna control board. The system was restored to working order and normal operations resumed at 19 UT.
Start	2005-05-20 12:00
End	2005-05-20 19:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	130	Failure of the UPS unit which powered the radar acquisition systems at around 00 UT on Sunday 22nd May caused the radar to be out of action until just after 08 UT on the following morning.
Start	2005-05-22 00:00
End	2005-05-22 08:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	131	One of the MST radar transmitters (a non-locking one) went down overnight on 1st June and was restarted in the morning.
Start	2005-06-01 00:00
End	2005-06-01 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	132	The UFAM boundary-layer wind-profiler was taken from the MST site on 1st June to be used in the CSIP campaign. The mobile lidar was taken on 6th June.
Start	2005-06-01 00:00
End	2005-06-06 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	133	The cloud radar was switched off at around 12:30 UT on 8th June because the temperature of the antenna unit rose too high. It was switched back on around 16:45 UT.
Start	2005-06-08 12:30
End	2005-06-08 16:45
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	134	ZAKO carried out work in the field on 10th and 14th June. There was no need to power down the MST radar.
Start	2005-06-10 00:00
End	2005-06-14 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	135	PC Pat Jalloal, a Community Safety Officer from Dyfed-Powys Police, visited the site on 16th June. He gave recommendations on how to improve site security.
Start	2005-06-16 00:00
End	2005-06-16 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	136	The cloud radar was stopped on 17th June and moved from where it had been in operation (immediately to the north of the bungalow). This was to allow the ground to be excavated for the new instrument platform.
Start	2005-06-17 00:00
End	2005-06-17 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	137	A digger was on site on Saturday 18th. It also excavated the ground where one of the old sheds had been. This area will have a car port built on it.
Start	2005-06-18 00:00
End	2005-06-18 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	138	A failure of a UPS unit at around 19 UT on Sunday 19th June caused MST radar data to stop being acquired. The problem was fixed at around 08 UT the following morning.
Start	2005-06-19 19:00
End	2005-06-20 08:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	139	ZAKO carried out work on the MST antennas on 23rd June. This did not require the radar to be powered down.
Start	2005-06-23 00:00
End	2005-06-23 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	140	The MST radar was shut down at around 17:15 UT on 28th June because of thunderstorms in the area. The thunderstorms caused extensive damage to equipment at the UofWA. The radar was switched back on at 07:30 UT the following morning.
Start	2005-06-28 17:15
End	2005-06-29 07:30
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	141	The concrete for the new instrument platform was poured and levelled on 1st July. The concreting for the car port will be done at a later date.
Start	2005-07-01 00:00
End	2005-07-01 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	142	The cloud radar was placed on the new instrument platform and restarted around 15:45 UT on 4th July.
Start	2005-07-04 15:45
End	2005-07-04 15:45
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	143	The grass was cut on 5th July.
Start	2005-07-05 00:00
End	2005-07-05 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	144	The MST radar was stopped between 09:00 and 10:15 UT on 8th July to allow ZAKO to carry out work on the relays.
Start	2005-07-08 09:00
End	2005-07-08 10:15
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	145	Weed spraying was carried out on 9th July.
Start	2005-07-09 00:00
End	2005-07-09 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	146	The cloud radar was shut down at 11 UT because the temperature of the antenna unit was rising too high. It was switched back on on 15th July.
Start	2005-07-15 00:00
End	2005-07-15 00:00
Added	2005-08-02 13:45
Author	ZKO

[Data]

Number	252	Instrument: MST Radar. There was a short break in observations to allow the radar control and data acquisition PC to be rebooted.
Start	2006-04-03 12:10
End	2006-04-03 12:15
Added	2007-05-16 09:56
Author	DAH

[Data]

Number	253	Instrument: MST Radar. There was a short break in observations to allow the radar control and data acquisition PC to be rebooted.
Start	2006-04-13 09:45
End	2006-04-13 09:50
Added	2007-05-16 09:57
Author	DAH

[Data]

Number	254	Instrument: MST Radar. There was a short gap in observations to allow the radar control and data acquisition PC to be rebooted.
Start	2006-04-20 08:55
End	2006-04-20 09:10
Added	2007-05-16 09:59
Author	DAH

[Data]

Number	255	Instrument: MST Radar. There was a short gap in observations to allow the radar control and data acquisition PC to be rebooted.
Start	2006-05-01 10:05
End	2006-05-01 10:10
Added	2007-05-16 10:01
Author	DAH

[Data]

Number	256	Instrument: MST Radar. There was a short gap in observations to allow the radar control and data acquisition PC to be rebooted.
Start	2006-05-11 18:55
End	2006-05-11 19:00
Added	2007-05-16 10:02
Author	DAH

[Data]

Number	175	Instrument: Relative Humidity sensor. The relative humidity readings during this period show large and unrealistic fluctuations. Some of the readings exceed 100%. At around 2006/05/27 11:40, the readings suddenly drop close to 0% and have remained so ever since (noted on 2006/09/06). This suggests that the probe may have failed.
Start	2006-05-26 21:40
End	2006-05-27 11:40
Added	2006-09-06 10:14
Author	DAH

[Data]

Number	257	Instrument: MST Radar. An unexpected power-cut, after ZAKO left the site in the evening, caused the radar to stop operating. The radar was restarted the following morning when ZAKO returned to site.
Start	2006-06-05 18:10
End	2006-06-06 08:10
Added	2007-05-16 10:07
Author	DAH

[Data]

Number	258	Instrument: MST Radar. There was a short gap in observations to allow the radar control and data acquisition PC to be rebooted.
Start	2006-06-16 14:00
End	2006-06-16 14:05
Added	2007-05-16 10:07
Author	DAH

[Data]

Number	2407	Instrument: MST Radar. Horizontal wind data between times of 17:45 and 19:15 UTC and between altitudes of 12.5 and 21.0 km should be ignored. The signal has been contaminated by interference.
Start	2006-06-23 17:45
End	2006-06-23 19:15
Added	2019-05-09 15:12
Author	DAH

[Data]

Number	2408	Instrument: MST Radar. The horizontal winds between times of 17:00 and 19:00 UTC and between altitudes of 12.5 and 21.0 km should be ignored. The signal has been contaminated by interference.
Start	2006-06-26 17:00
End	2006-06-26 19:00
Added	2019-05-09 15:22
Author	DAH

[Data]

Number	259	Instrument: MST Radar. The radar stopped operating owing to problems with the control and data acquisition PC, which appears to have crashed around 06:10 UT. The PC was restarted when ZAKO arrived on site.
Start	2006-06-27 05:10
End	2006-06-27 08:20
Added	2007-05-16 10:11
Author	DAH

[Data]

Number	260	Instrument: MST Radar. The radar and all computers were powered down to allow DAH and ZAKO to re-arrange equipment.
Start	2006-06-28 13:10
End	2006-06-28 14:10
Added	2007-05-16 10:12
Author	DAH

[Data]

Number	261	Instrument: MST Radar. The radar was powered down because of thunderstorms in the Capel Dewi area. It was restarted the following morning.
Start	2006-07-02 20:45
End	2006-07-03 07:10
Added	2007-05-16 10:19
Author	DAH

[Data]

Number	2410	Instrument: MST Radar. Horizontal wind data between times of 06:45 and 08:00 UTC and between altitudes of 12.5 and 21.0 km should be ignored. The signal has been contaminated by interference.
Start	2006-07-03 06:45
End	2006-07-03 08:00
Added	2019-05-09 16:02
Author	DAH

[Data]

Number	262	Instrument: MST Radar. The radar stopped function owing to a thunderstorm in the Capel Dewi area.
Start	2006-07-04 17:10
End	2006-07-04 18:20
Added	2007-05-16 10:21
Author	DAH

[Data]

Number	263	Instrument: MST Radar. The radar was shut down because of thunderstorms in the Capel Dewi area.
Start	2006-07-05 15:40
End	2006-07-05 19:10
Added	2007-05-16 10:23
Author	DAH

[Data]

Number	2409	Instrument: MST Radar. Horizontal wind data between times of 15:00 and 16:45 UTC and between altitudes of 14.5 and 21.0 km should be ignored. The signal has been contaminated by interference.
Start	2006-07-06 15:00
End	2006-07-06 15:00
Added	2019-05-09 16:01
Author	DAH

[Data]

Number	2411	Instrument: MST Radar. Horizontal wind data should be ignored within two time-altitude regions: between times of 07:15 and 08:45 UTC and between altitudes of 13.5 and 21.0 km, and between times of 12:15 and 13:45 UTC and between altitudes of 13.0 and 21.0 km. The signal has been contaminated by interference.
Start	2006-07-07 07:15
End	2006-07-07 13:45
Added	2019-05-09 16:13
Author	DAH

[Data]

Number	2412	Instrument: MST Radar. Horizontal wind data should be ignored between times of 13:00 and 14:45 UTC and between altitudes of 13.0 and 21.0 km should be ignored. The signal has been contaminated by interference.
Start	2006-07-08 13:00
End	2006-07-08 14:45
Added	2019-05-09 16:19
Author	DAH

[Data]

Number	2413	Instrument: MST Radar. Horizontal wind data should be ignored between times of 14:45 and 15:45 UTC and between altitudes of 17.0 and 21.0 km should be ignored. The signal has been contaminated by interference.
Start	2006-07-09 14:45
End	2006-07-09 15:45
Added	2019-05-09 16:21
Author	DAH

[Data]

Number	2414	Instrument: MST Radar. Horizontal wind data should be ignored between times of 12:50 and 15:10 UTC and between altitudes of 2.0 and 21.0 km. The signal has been contaminated by interference.
Start	2006-07-10 12:50
End	2006-07-10 14:10
Added	2019-05-09 16:26
Author	DAH

[Data]

Number	2415	Instrument: MST Radar. Horizontal wind data should be ignored between times of 12:30 and 15:15 UTC and between altitudes of 7.0 and 21.0 km. The signal has been contaminated by interference.
Start	2006-07-13 12:30
End	2006-07-13 15:15
Added	2019-05-09 16:31
Author	DAH

[Data]

Number	264	Instrument: MST Radar. There was a short gap in observations to allow the radar control and data acquisition PC to be rebooted.
Start	2006-07-14 14:00
End	2006-07-14 14:05
Added	2007-05-16 10:27
Author	DAH

[Data]

Number	2416	Instrument: MST Radar. Horizontal wind data should be ignored within two time-altitude regions: between times of 11:30 and 13:00 UTC and between altitudes of 9.0 and 21.0 km, and between times of 15:30 and 18:00 UTC and between altitudes of 9.0 and 21.0 km. The signal has been contaminated by interference.
Start	2006-07-17 11:30
End	2006-07-17 16:31
Added	2019-05-09 16:35
Author	DAH

[Data]

Number	2417	Instrument: MST Radar. Horizontal wind data should be ignored between times of 11:15 and 12:15 UTC and between altitudes of 7.0 and 21.0 km. The signal has been contaminated by interference.
Start	2006-07-19 11:15
End	2006-07-19 12:15
Added	2019-05-09 16:39
Author	DAH

[Data]

Number	2418	Instrument: MST Radar. Horizontal wind data should be ignored within two time-altitude regions: between times of 14:00 and 16:00 UTC and between altitudes of 10.0 and 21.0 km, and between times of 16:30 and 18:00 UTC and between altitudes of 10.0 and 21.0 km. The signal has been contaminated by interference.
Start	2006-07-20 14:30
End	2006-07-20 14:30
Added	2019-05-10 08:40
Author	DAH

[Data]

Number	2419	Instrument: MST Radar. Horizontal wind data should be ignored between times of 17:00 and 16:00 UTC and between altitudes of 17.0 and 21.0 km. The signal has been contaminated by interference.
Start	2006-07-23 17:00
End	2006-07-23 18:00
Added	2019-05-10 08:49
Author	DAH

[Data]

Number	265	Instrument: MST Radar. There was a short gap in observations to allow the radar control and data acquisition PC to be rebooted.
Start	2006-07-24 07:45
End	2006-07-24 07:55
Added	2007-05-16 10:29
Author	DAH

[Data]

Number	149	Instrument: MST Radar. ZAKO rebooted the radar control and data acquisition PC.
Start	2006-07-24 07:50
End	2006-07-24 07:50
Added	2006-07-31 09:39
Author	DAH

[Data]

Number	152	Instrument: MST radar. The transmitter which first went down on 2006/07/26, and which was fixed by ZAKO on 2006/07/28, continued to cause trouble until 2006/07/31. ZAKO reported that the EHT monitor chip and level detector were feeding incorrect info to the transmitter. He solved the problem by adjausting preset VR11 on IC4 on the interface board.
Start	2006-07-26 00:00
End	2006-07-31 11:00
Added	2006-08-01 15:38
Author	DAH

[Data]

Number	148	Instrument: MST Radar. The radar suffered from radio frequency interference from 11:00 - 14:00 UT and then again from 17:30 - 18:00 UT.
Start	2006-07-26 11:00
End	2006-07-26 18:00
Added	2006-07-27 08:43
Author	DAH

[Data]

Number	2420	Instrument: MST Radar. Horizontal wind data should be ignored within two time-altitude regions: between times of 11:00 and 14:00 UTC and between altitudes of 12.0 and 21.0 km, and between times of 17:00 and 18:00 UTC and between altitudes of 12.0 and 21.0 km. The signal has been contaminated by interference.
Start	2006-07-26 11:00
End	2006-07-26 18:00
Added	2019-05-10 08:55
Author	ZKO

[Data]

Number	147	Instrument: MST Radar. Dave Wareing reported that one of the transmitters has been down since late this morning (ZAKO is away from site). Since this is not the phase-locking transmitter, the radar has continued to operate normally. The transmitter will not be fixed until at least 28/07/2006 when ZAKO returns to site.
Start	2006-07-26 15:57
End	2006-07-26 15:57
Added	2006-07-26 16:01
Author	DAH

[Data]

Number	150	Instrument: MST Radar. Quick-look plots show that the data acquisition was disrupted three times (for approximately 10 minutes each). The probable cause was mains power disruption in the Capel Dewi area - the radar return signal power is at the noise level during each event. The v2 signal processing has apparently filtered out the meaningless data. The PCs kept running from the UPS during these events.
Start	2006-07-28 10:00
End	2006-07-28 11:00
Added	2006-07-31 09:43
Author	DAH

[Data]

Number	151	Instrument: MST Radar. ZAKO returned from leave and restarted the transmitter which had been down since 2006/07/26. This problem had not had a significant effect on data acquisition.
Start	2006-07-28 18:00
End	2006-07-28 18:00
Added	2006-07-31 09:46
Author	DAH

[Data]

Number	2421	Horizontal wind data should be ignored between times of 09:15 and 12:15 UTC and between altitudes of 6.5 and 21.0 km. The signal has been contaminated by interference. Moreover, the beam broadening corrected vertical beam spectral width data should be ignored between times of 10:30 and 14:00 UTC at all altitudes.
Start	2006-08-01 09:15
End	2006-08-01 14:00
Added	2019-05-10 10:13
Author	DAH

[Data]

Number	153	Instrument: MST Radar. The radar experienced three instances of interference - from 09:30 - 10:30 UT, from 11:00 - 12:00 UT, and from 13:00 - 15:00 UT. In the second two instances the interference was particularly intense and was apparent across the entire ST-mode observed altitude range. Although this caused serious contamination, in the second two instances it was filtered out by the complementary beam checking of v2 processing, and was avoided altogether for v3 processing.
Start	2006-08-01 09:30
End	2006-08-01 15:00
Added	2006-08-02 08:24
Author	DAH

[Data]

Number	154	Instrument: MST Radar. The radar control and data acquisition PC was rebooted around 15:30 UT.
Start	2006-08-01 15:30
End	2006-08-01 15:40
Added	2006-08-02 09:33
Author	DAH

[Data]

Number	155	Instrument: MST Radar. Mild interference occurred between 00:00 and 02:30 UT and then again between 17:00 and 18:30 UT.
Start	2006-08-02 00:00
End	2006-08-02 18:30
Added	2006-08-04 08:30
Author	DAH

[Data]

Number	2422	Instrument: MST Radar. Horizontal wind data should be ignored between times of 17:00 and 18:00 UTC and between altitudes of 10.0 and 21.0 km. The signal has been contaminated by interference. Although the horizontal wind does not look overly affected, the contamination is clear in the aspect sensitivity parameter within this time-altitude region.
Start	2006-08-02 17:00
End	2006-08-02 18:00
Added	2019-05-10 10:19
Author	DAH

[Data]

Number	156	Instrument: MST Radar. Mild interference occurred between 04:00 and 06:00 UT and then again between 15:00 and 16:00 UT.
Start	2006-08-03 04:00
End	2006-08-03 16:00
Added	2006-08-04 08:32
Author	DAH

[Data]

Number	157	Instrument: MST Radar. Interference was experienced, primarily from 17:20 - 21:10 UT and apparently confined to vertical beam observations. It was most obvious at the lower range gates of the ST mode. It appears to have resulted in missing data for the v2 processing, rather than contamination. A more minor incident occurred around 11:10 UT.
Start	2006-08-05 17:20
End	2006-08-05 21:10
Added	2006-08-07 08:54
Author	DAH

[Data]

Number	2423	Instrument: MST Radar. Horizontal wind data should be ignored between times of 18:30 and 20:00 UTC and between altitudes of 1.6 and 10.0 km. The signal has been contaminated by interference.
Start	2006-08-05 18:30
End	2006-08-05 20:00
Added	2019-05-10 10:26
Author	DAH

[Data]

Number	158	Instrument: MST Radar. Interference was experienced in a similar pattern to that of the revious day (2006/08/05).
Start	2006-08-06 02:00
End	2006-08-06 09:10
Added	2006-08-07 08:57
Author	DAH

[Data]

Number	2424	Instrument: MST Radar. Horizontal wind data should be ignored between times of 04:00 and 08:45 UTC and between altitudes of 1.6 and 21.0 km. The signal has been contaminated by interference.
Start	2006-08-06 04:00
End	2006-08-06 08:45
Added	2019-05-10 10:30
Author	DAH

[Data]

Number	159	Instrument: MST Radar. The radar was again contaminated by the new type of interference encountered only over the past few days. Rather than manifesting itself most strongly where the atmospheric signal is weakest, it is most prevalent in the altitude range 5 - 15 km. It appears to be caused by a secondary signal component, which is sufficiently close to the desired signal but with a slightly more positive Doppler velocity, for both to be identified (by v2 processing) as belonging to a single signal. The most obvious manifeststation is the persistent upward vertical velocities. v2 processing is able to filter out some of the contamination. v0 is clearly badly affected. v3 appears to be able to cope quite well.
Start	2006-08-07 06:00
End	2006-08-07 23:59
Added	2006-08-08 08:43
Author	DAH

[Data]

Number	2425	Instrument: MST Radar. Horizontal wind data should be treated with caution between times of 06:00 and 23:59 UTC and between altitudes of 1.6 and 21.0 km. The signal has been contaminated by interference. The vertical velocity also looks unrealistic throughout most of this region.
Start	2006-08-07 06:00
End	2006-08-07 23:59
Added	2019-05-10 10:33
Author	DAH

[Data]

Number	160	Instrument: MST Radar. The new (type-2) interference continued over from the previous day until around 00:40 UT.
Start	2006-08-08 00:00
End	2006-08-08 00:40
Added	2006-08-09 09:21
Author	DAH

[Data]

Number	2426	Instrument: MST Radar. Horizontal wind data should be treated with caution between times of 00:00 and 00:45 UTC and between altitudes of 1.6 and 21.0 km. The signal has been contaminated by interference. The vertical velocity also looks unrealistic throughout some of this region.
Start	2006-08-08 00:00
End	2006-08-08 00:45
Added	2019-05-10 10:36
Author	DAH

[Data]

Number	161	Instrument: MST Radar. ZAKO briefly shut down the radar to allow him to re-arrange some equipment in an attempt to track down (or at least to eliminate) the source of the sporadic interference. The problem is known to have become more common since equipment was moved into a new rack. He switched off the oscilloscope and removed a number a scope leads which were attached to the receiver and various parts of the pre-processing units.
Start	2006-08-08 09:30
End	2006-08-08 09:45
Added	2006-08-09 09:21
Author	DAH

[Data]

Number	162	Instrument: Ceilometer. The PC which logs data from the ceilometer stopped functioning at around midnight after performing an automatic Windows update. The PC needs to be re-booted before normal operations can resume. This was done when ZAKO arrived on site. This is a known issue (discussed at the last Experimenters' meeting) and DAH will switch to manual updates when he next visits the site in ten days time. Although the usual download of data from the surface met sensor logger was affected by this problem, the missing data will be captured when the next scheduled download is carried out.
Start	2006-08-10 00:00
End	2006-08-10 08:00
Added	2006-08-10 09:46
Author	DAH

[Data]

Number	163	Instrument: MST Radar. The radar control and data acquisition PC was rebooted resulting in a small loss of coverage.
Start	2006-08-10 15:30
End	2006-08-10 15:40
Added	2006-08-15 09:26
Author	DAH

[Data]

Number	2427	Instrument: MST Radar. Horizontal wind data should be ignored between times of 10:20 and 11:10 UTC and between altitudes of 10.5 and 11.5 km.
Start	2006-08-13 10:20
End	2006-08-13 11:10
Added	2019-05-10 10:41
Author	DAH

[Data]

Number	164	Instrument: Ceilometer. The data logging PC stopped acquiring data at 00:00 UT and did not resume operations until ZAKO logged back in at 08:00 UT. Typically this problem occurs when an automatic Windows update has taken place. However, on this occasion the other Windows PCs did not show any indications that an update had taken place.
Start	2006-08-14 00:00
End	2006-08-14 08:00
Added	2006-08-15 09:30
Author	DAH

[Data]

Number	165	Instrument: MST Radar. The Met Office switched over from v0 to v3 data for operational assimilation. The v3 data stream under test status was shut down after the 09:30 UT message and restarted in operational status for the 11:00 UT message. The last v0 message in operational status was for 09:59 UT. No more v0 messages were sent for the rest of the day.
Start	2006-08-16 10:00
End	2006-08-16 11:00
Added	2006-08-17 12:35
Author	DAH

[Data]

Number	166	Instrument: MST Radar. DAH restarted the v0 data stream to the Met Office, now in test status, in time for the 10:03 UT message. This required changes to be made to the v0 BUFR encoding program so that data were only sent to the CWINDE hub and not distributed to other users.
Start	2006-08-17 10:03
End	2006-08-17 10:03
Added	2006-08-17 12:37
Author	DAH

[Data]

Number	266	Atmospheric. A thunderstorm passed over the radar site. The radar was not powered down and so there was no loss of observations.
Start	2006-08-18 08:40
End	2006-08-18 08:40
Added	2007-05-16 11:48
Author	DAH

[Data]

Number	167	Instrument: MST Radar. Instrument: Ceilometer. The radar was down for nearly 2 hours, and no ceilometer data were collected, to allow equipment to be re-organised in the computer rack.
Start	2006-08-21 16:00
End	2006-08-21 17:45
Added	2006-08-22 09:23
Author	DAH

[Data]

Number	169	Instrument: Ceilometer. The time stamps for ceilometer data are taken from the internal clock. This was changed manually at 10:55 UT as it was running approximately 5 minutes slow. During this procedure, the units in which altitudes are recorded was accidentally changed from metres to feet. The units are stored in the data messages and so this does not affect the usefulness of the data. The units were reset to metres at 12:40 UT.
Start	2006-08-22 10:55
End	2006-08-22 12:40
Added	2006-08-23 09:19
Author	DAH

[Data]

Number	168	Instrument: MST Radar. The regular supply of data was halted for almost 48 hours whilst a new radar control and data acquisition system was being tested.
Start	2006-08-22 15:25
End	2006-08-24 09:00
Added	2006-08-23 09:10
Author	DAH

[Data]

Number	170	Instrument: MST Radar. Observations were interrupted for approximately 5 minutes to allow the radar control and data acquistion computer to be re-booted.
Start	2006-09-01 13:20
End	2006-09-01 13:25
Added	2006-09-04 11:11
Author	DAH

[Data]

Number	172	Instrument: MST Radar. The power output from TX1 was found to be very low. ZAKO made gradual adjustments, starting at 08 UT, to bring the power back up to a normal level. This was completed by 10 UT.
Start	2006-09-04 08:00
End	2006-09-04 10:00
Added	2006-09-06 10:01
Author	DAH

[Data]

Number	171	Instrument: MST Radar. The radar experienced interference - the first time since ZAKO re-arranged equipment in the rack on 2006/08/08. The interference is more apparent in the M-mode data than in the ST-mode data. It affected both v0 and v2 processing. It is not yet clear whether it affected v3 processing.
Start	2006-09-04 13:20
End	2006-09-04 17:40
Added	2006-09-05 08:32
Author	DAH

[Data]

Number	2428	Instrument: MST Radar. Horizontal wind data should be ignored between times of 15:30 and 16:50 UTC and between altitudes of 10.0 and 11.5 km. This reg ion appears to be contaminated with interference.
Start	2006-09-04 15:30
End	2006-09-04 16:50
Added	2019-05-10 11:54
Author	DAH

[Data]

Number	174	Instrument: MST Radar. A problem associated with the blower motor of TX2 caused the insulation on some wires to melt and for the transmitter to stop working (possibly at around 05 UT). ZAKO returned the transmitter to working order at 12 UT.
Start	2006-09-05 05:00
End	2006-09-05 12:00
Added	2006-09-06 10:06
Author	DAH

[Data]

Number	173	Instrument: MST Radar. The radar appears to have experienced mild interference. However, this is only apparent in the M-mode data.
Start	2006-09-05 11:30
End	2006-09-05 12:00
Added	2006-09-06 10:03
Author	DAH

[Data]

Number	177	Instrument: Humidity Sensor. ZAKO removed the sensor - which had stopped working on 2006/05/26 - cleaned it and then replaced it to see if corrosion on the contacts was causing the problem. Although a change can be seen in the readings at this time, it is from around 1.0% to around 0.5% - an unrealistic value.
Start	2006-09-06 09:15
End	2006-09-06 09:15
Added	2006-09-08 08:58
Author	DAH

[Data]

Number	176	Instrument: MST Radar. ZAKO rebooted the radar control and data acquisition PC leading to a short gap in observations.
Start	2006-09-06 14:15
End	2006-09-06 14:20
Added	2006-09-07 09:51
Author	DAH

[Data]

Number	178	Instrument: MST Radar. There were two brief periods of missing observations. These appear to have been caused by mains power fluctuations. At the same time the UPS logged instances of the voltage first being too low and then being too high.
Start	2006-09-09 05:00
End	2006-09-09 05:30
Added	2006-09-12 08:40
Author	DAH

[Data]

Number	182	Instrument: Wind Sensors. There have been problems connecting to the data logger (via a dial-up modem) at Frongoch farm since 2006/09/12. The problem appears to have been at the Capel Dewi end as a successful connection was established after some general fiddling-with-wires on 2006/09/14. This problem caused the data from approximately 15:30 - 18:30 UT on 2006/09/11 to be lost. Although it was thought that the connection issue was solved, no data were downloaded from Frongoch over the weekend. The problem was spotted on 2006/09/19 and again, after some fiddling-with-wires, a connection was established. This time the data from 2006/09/14 10:07 - 2006/09/16 19:43 were lost.
Start	2006-09-11 15:30
End	2006-09-19 11:00
Added	2006-09-19 15:11
Author	DAH

[Data]

Number	179	Instrument: MST Radar. ZAKO rebooted the radar control and data acquisition PC resulting in a short period of no observations being made.
Start	2006-09-15 14:40
End	2006-09-15 14:45
Added	2006-09-19 12:21
Author	DAH

[Data]

Number	180	Instrument: MST Radar. The radar experienced a short period of interference. This is only known to have contaminated v2 data. It is likely that both v0 and v3 data were unaffected.
Start	2006-09-17 21:20
End	2006-09-17 22:30
Added	2006-09-19 12:26
Author	ZKO

[Data]

Number	181	Instrument: MST Radar. The radar again experienced a short period of interference. ZAKO was still on site and so at around 18:30 UT he switched all TXs to state 1 (i.e. non-transmitting) and removed the antenna connection cables. Interference was still detected by the RX. The TXs were switched back into an operational state at around 18:40 UT and the interference persisted for a short while longer. The interference appears to have only contaminated v2 data - not v0 or v3 data.
Start	2006-09-18 17:30
End	2006-09-18 19:20
Added	2006-09-19 12:37
Author	DAH

[Data]

Number	183	Instrument: MST Radar. The radar experienced a mild case of interference. This does not appear to have contaminated either the v0 or v3 data streams and the corresponding data were automatically blanked by the v2 processing scheme. ZAKO spotted the problem and experimented by leaving the transmitters running but disconnecting the antenna feed to the receiver between approximately 08:50 and 08:52 UT. No interference was observed during this time but it re-appeared as soon as ZAKO reconnected the antenna feed. The interference disappeared by iteself shortly thereafter.
Start	2006-09-19 08:00
End	2006-09-19 09:00
Added	2006-09-21 14:35
Author	DAH

[Data]

Number	184	Instrument: MST Radar. The radar appears to have experienced three instances of very mild interference - between 10:00 and 11:00 UT, around 13:30 UT, and between 16:50 and 17:50 UT. This does not appear to have contaminated the data from any of the processing schemes. Ground clutter between 12:50 and 20:00 UT gave rise to missing data below 3 km for the v2 processing scheme.
Start	2006-09-21 10:00
End	2006-09-21 20:00
Added	2006-09-22 09:53
Author	DAH

[Data]

Number	186	Instrument: Wind Sensors. DAH synchronised the clock on the Frongoch data logger, which had been running approximately 1 minute late.
Start	2006-09-21 11:00
End	2006-09-21 11:00
Added	2006-09-22 10:17
Author	DAH

[Data]

Number	230	Instrument: Relative Humidity sensor. ZAKO once again cleaned the contacts of the relative humidity sensor and replaced it at 13 UT (addressing the problem of clearly incorrect data readings which started on 2006-05-26). The readings rose from near 1% to over 130% (and fluctuating)but settled down to more realistic values at 21 UT.
Start	2006-09-21 13:00
End	2006-09-21 21:00
Added	2007-01-30 09:31
Author	DAH

[Data]

Number	189	Instrument: Wind Sensors. Despite the fact that it was thought the dial-up connection to Frongoch had been fixed on Friday 22nd, no wind data were collected automatically over the weekend. Data were downloaded manually on the morning of Monday 25th. Nine hours of wind data were lost (the memory in the data logger can only hold less than three days' worth of data).
Start	2006-09-22 10:03
End	2006-09-22 19:43
Added	2006-09-26 08:34
Author	DAH

[Data]

Number	185	Instrument: Wind sensors. The dial-up modem used to connect to the Frongoch data logger continued to give problems (which began on 2006/09/11). This meant that data had to be downloaded at sporadic times although no further data were lost. ZAKO switched over to a new modem on 2006/09/22 and this appears to have solved the problem.
Start	2006-09-22 10:07
End	2006-09-22 10:07
Added	2006-09-22 10:10
Author	DAH

[Data]

Number	2430	Instrument: MST Radar. Horizontal wind data should be ignored between times of 23:30 and 23:59 UTC and between altitudes of 13.5 and 21.0 km. The speeds are unrealistically large compared to those at adjacent times.
Start	2006-09-23 23:30
End	2006-09-23 23:59
Added	2019-05-10 12:25
Author	DAH

[Data]

Number	2429	Instrument: MST Radar. Horizontal wind data should be ignored between times of 00:00 and 00:30 UTC and between altitudes of 13.5 and 21.0 km. The speeds are unrealistically large compared to those at adjacent times.
Start	2006-09-24 00:00
End	2006-09-24 00:30
Added	2019-05-10 12:24
Author	DAH

[Data]

Number	187	Instrument: MST Radar. The radar experienced some interference which led to mild contamination of v2 data.
Start	2006-09-24 02:00
End	2006-09-24 04:00
Added	2006-09-25 09:38
Author	DAH

[Data]

Number	188	Instrument: MST Radar. The radar experienced an extended period of interference. The contaminated data were mostly filtered out by the v2 processing. V1 and v3 data appear to have suffered only minor contamination. Shorter gaps in the v2 data, around 08 UT and 13 UT, were probably also related to interference.
Start	2006-09-25 19:30
End	2006-09-25 23:59
Added	2006-09-26 08:23
Author	DAH

[Data]

Number	2431	Instrument: MST Radar. Horizontal wind data should be ignored within two time-altitude regions: between times of 19:50 and 20:50 UTC and between altitudes of 13.5 and 15.0 km, and between times of 22:30 and 23:30 UTC and between altitudes of 13.5 and 16.5 km The speeds are unrealistically large compared to those at adjacent times.
Start	2006-09-25 19:50
End	2006-09-25 23:30
Added	2019-05-10 12:31
Author	DAH

[Data]

Number	190	Instrument: MST Radar. The radar control and data acquisition PC was rebooted, leading to a short gap in observations.
Start	2006-09-26 08:20
End	2006-09-26 08:30
Added	2006-09-27 08:33
Author	DAH

[Data]

Number	191	Instrument: MST Radar. The radar experienced two brief periods of interference - from 01:50 - 02:40 and from 13:40 - 14:20. These do not appear to have contaminated v0 or v3 data. There is a low degree of contamination of v2 data for the first occurrence, but the affected data were filtered out by the reliability flagging for the second occurrence.
Start	2006-09-26 13:40
End	2006-09-26 14:20
Added	2006-09-27 08:39
Author	DAH

[Data]

Number	192	Instrument: MST Radar. The radar suffered interference between 21:40 and 23:59 UT and previously for a shorter time between 10:30 and 11:20 UT. This was mostly filtered out by the v2 processing. The v3 data were contaminated above 15 km. The v0 data appear to be free of contamination.
Start	2006-09-27 21:40
End	2006-09-27 23:59
Added	2006-09-28 08:31
Author	DAH

[Data]

Number	2432	Instrument: MST Radar. Horizontal wind data should be ignored between times of 21:50 and 23:40 UTC and between altitudes of 5.0 and 19.0 km. The speeds are unrealistically large compared to those at adjacent times. The contamination appears to be the result of interference.
Start	2006-09-27 21:50
End	2006-09-27 23:40
Added	2019-05-10 12:36
Author	DAH

[Data]

Number	193	Instrument: MST Radar. The radar experienced interference. This was mostly filtered out by the v2 processing and only caused minor contamination of the v0 and v3 data.
Start	2006-09-28 19:00
End	2006-09-28 21:20
Added	2006-09-29 08:22
Author	DAH

[Data]

Number	2433	Instrument: MST Radar. Horizontal wind data should be ignored between times of 19:20 and 20:30 UTC and between altitudes of 8.0 and 18.0 km. The speeds are unrealistically large compared to those at adjacent times. The contamination appears to be the result of interference.
Start	2006-09-28 19:20
End	2006-09-28 20:30
Added	2019-05-10 12:40
Author	DAH

[Data]

Number	267	Atmospheric. There was a brief period of heavy rain.
Start	2006-09-29 09:30
End	2006-09-29 09:30
Added	2007-05-16 11:57
Author	DAH

[Data]

Number	198	Instrument: Wind Sensors. The problems connecting via dial-up modem to Frongoch persisted even after a new modem was installed. Connections have been difficult to establish and each day it has been necessary to download the data manually, ususally after several unsuccessful attempts. This resulted is the loss of six and a half hours data from 2006-09-29 (a Friday) since the logger is only able to store less than three days worth of data and these were not downloaded until the Monday morning (2006-10-02). It has been established that there are faults on the site telephone and fax lines (the latter of which is used to connect to Frongoch) and it is now thought that this has been causing the problems connecting to Frongoch.
Start	2006-09-29 11:01
End	2006-09-29 17:38
Added	2006-10-05 08:45
Author	DAH

[Data]

Number	194	Instrument: MST Radar. The radar experienced mild interference. It was filtered out from the v2 data and was unlikely to have had a significant effect on the v0 and v3 data.
Start	2006-09-30 18:30
End	2006-09-30 19:30
Added	2006-10-02 09:00
Author	DAH

[Data]

Number	195	Instrument: MST Radar. The radar experienced three short periods of interference - between 09:40 and 11:00 UT, between 14:00 and 14:30 UT, and between 16:00 and 17:00 UT. This does not appear to have caused significant contamination for any of the data streams.
Start	2006-10-01 09:40
End	2006-10-01 17:00
Added	2006-10-02 09:05
Author	DAH

[Data]

Number	196	Instrument: MST Radar. The radar experienced four short periods of mild interference - around 10:00 UT, around 11:20 UT, around 14:50 UT and around 17:20 UT. This does not appear to have caused significant contamination for any of the data streams.
Start	2006-10-02 09:50
End	2006-10-02 18:00
Added	2006-10-05 08:29
Author	DAH

[Data]

Number	197	Instrument: MST Radar. The radar experienced 5 relatively mild periods of interference - around 02:00 UT, around 05:00 UT, around 09:20 UT, around 12:00 UT and around 17:00 UT - and then one longer period from 21:00 - 23:59 UT. All resulted in gaps in the v2 data and only mild contamination of the v0 and v3 data.
Start	2006-10-04 01:30
End	2006-10-04 23:59
Added	2006-10-05 08:34
Author	DAH

[Data]

Number	2434	Instrument: MST Radar. Horizontal wind data should be ignored between times of 04:15 and 05:45 UTC and between altitudes of 7.5 and 21.0 km. The speeds are unrealistically large compared to those at adjacent times. The contamination appears to be the result of interference. There is already a gap in the data at around 21:00 UTC, which appears to be where the signal processing has correctly blanked another region of contamination.
Start	2006-10-04 04:15
End	2006-10-04 05:45
Added	2019-05-10 14:42
Author	DAH

[Data]

Number	199	Instrument: MST Radar. The radar experienced a short period of interference. The v2 data show mild contamination.
Start	2006-10-05 06:00
End	2006-10-05 07:20
Added	2006-10-09 09:21
Author	DAH

[Data]

Number	200	Instrument: MST Radar. The radar control and data acqusition PC was rebooted leading to a short gap in observations.
Start	2006-10-06 11:25
End	2006-10-06 11:35
Added	2006-10-09 09:23
Author	DAH

[Data]

Number	201	Instrument: MST Radar. The radar experienced a short period of interference. V2 data show only mild contamination.
Start	2006-10-06 21:50
End	2006-10-06 23:00
Added	2006-10-09 09:24
Author	DAH

[Data]

Number	202	Instrument: MST Radar. The radar experienced three short periods of interference - around 07:30 UT, around 11:30 UT and around 14:30 UT. None of these appears to have caused contamination of the data.
Start	2006-10-07 07:00
End	2006-10-07 15:00
Added	2006-10-09 09:29
Author	DAH

[Data]

Number	2435	Instrument: MST Radar. Horizontal wind data should be ignored within two time-latitude regions: between times of 12:50 and 13:40 UTC and between altitudes of 7.0 and 21.0 km, and between times of 14:10 and 14:50 UTC and between altitudes of 7.0 and 21.0 km. Although the speeds do not look so different from those at adjacent times and altitudes, the aspect sensitivity data indicate the presence of contamination.
Start	2006-10-08 12:50
End	2006-10-08 14:50
Added	2019-05-10 15:20
Author	DAH

[Data]

Number	203	Instrument: MST Radar. The radar experienced a period of interference. This appears to have caused mild contamination of the v0 and v2 data.
Start	2006-10-08 13:00
End	2006-10-08 15:00
Added	2006-10-09 09:31
Author	DAH

[Data]

Number	204	Instrument: MST Radar. The radar experienced two periods of mild interference - between 00:00 and 01:00 UT and between 13:00 and 14:30 UT. This appears to have caused only minor contamination of v2 data.
Start	2006-10-09 00:00
End	2006-10-09 14:30
Added	2006-10-17 08:36
Author	DAH

[Data]

Number	2436	Instrument: MST Radar. Horizontal wind data should be ignored within two time-latitude regions: between times of 00:10 and 01:00 UTC and between altitudes of 8.5 and 21.0 km, and between times of 13:30 and 14:30 UTC and between altitudes of 14.0 and 21.0 km. The sudden increase in altitude coverage during these periods is the result of interference.
Start	2006-10-09 00:10
End	2006-10-09 14:30
Added	2019-05-10 15:25
Author	DAH

[Data]

Number	268	Atmospheric. ZAKO reported that a thunderstorm passed over (at an unspecified time) during the early hours of the morning.
Start	2006-10-11 00:00
End	2006-10-11 06:00
Added	2007-05-16 12:02
Author	DAH

[Data]

Number	205	Instrument: MST Radar. The radar control and data acquisition PC was rebooted at 09:00 UT leading to a short gap in observations.
Start	2006-10-16 09:00
End	2006-10-16 09:10
Added	2006-10-17 08:37
Author	DAH

[Data]

Number	206	Instrument: MST Radar. The radar control and data acquisition PC was rebooted at 09:00 UT leading to a short gap in observations.
Start	2006-10-16 09:00
End	2006-10-16 09:10
Added	2006-10-17 12:05
Author	DAH

[Data]

Number	207	Instrument: Ceilometer. Data from the instrument stopped being logged at 10:01 UT on 2006-10-18. This problem was not spotted until the following morning when DAH restarted the acquisition program.
Start	2006-10-18 10:01
End	2006-10-19 07:08
Added	2006-10-19 08:13
Author	DAH

[Data]

Number	208	Instrument: MST Radar. The radar suffered a prolonged period of interference. It is speculated that this was a result of the door to the computer room being left shut overnight without the air conditioning being switched on. ZAKO was on site on 21st (a Saturday) and noticed that the computer room very hot.
Start	2006-10-20 17:30
End	2006-10-21 12:00
Added	2006-10-23 08:43
Author	DAH

[Data]

Number	2437	Instrument: MST Radar. Horizontal wind data should be ignored within two time-altitude regions: between times of 18:20 and 20:00 UTC and between altitudes of 7.5 and 21.0 km, and between times of 22:10 and 22:50 UTC and between altitudes of 12.5 and 14.5 km. The sudden increase in altitude coverage during the first period is the result of interference.
Start	2006-10-20 18:20
End	2006-10-20 22:50
Added	2019-05-10 15:32
Author	DAH

[Data]

Number	2438	Instrument: MST Radar. Horizontal wind data should be ignored between times of 01:50 and 06:00 UTC and between altitudes of 7.5 and 21.0 km. This is part of a longer episode of interference, which carries on until at least 09:30 UTC, although the signal processing appears to have been effective at avoiding the contamination during later times.
Start	2006-10-21 01:50
End	2006-10-21 09:30
Added	2019-05-10 16:13
Author	DAH

[Data]

Number	269	Instrument: MST Radar. ZAKO visited the site (a Sunday) and noticed that TX5 was down at 1225 UT. He restarted it but it was down again at 1430 UT. ZAKO shut down all transmitters at 1450 UT to allow him to carry out further repairs. Observations were resumed at 1800 UT.
Start	2006-10-21 14:50
End	2006-10-21 18:00
Added	2007-05-16 12:12
Author	DAH

[Data]

Number	209	Instrument: MST Radar. The radar experienced a short period of mild interference. It appears to have caused only minor contamination of v2 data.
Start	2006-10-23 13:30
End	2006-10-23 14:30
Added	2006-10-27 08:33
Author	DAH

[Data]

Number	210	Instrument: MST Radar. ZAKO rebooted the radar control and data acquisition PC leading to a small gap in observations.
Start	2006-10-26 08:30
End	2006-10-26 08:40
Added	2006-10-27 08:35
Author	DAH

[Data]

Number	2439	Instrument: MST Radar. Horizontal wind data should be ignored between times of 10:45 and 12:00 UTC and between altitudes of 15.0 and 21.0 km. Some of the speeds are unrealistically faster than those at adjacent times and altitudes.
Start	2006-10-27 10:45
End	2006-10-27 12:00
Added	2019-05-10 16:18
Author	DAH

[Data]

Number	211	Instrument: Ceilometer. Logging of data from the laser ceilometer stopped at 10 UT on 2006-11-04, a Saturday. It is likely that this was caused by the acquisition computer connecting to the Frongoch data logger (via a dial-up modem) to download surface wind data. Similar problems have occasionally occured in the past. ZAKO was on site on 2006-11-05, a Sunday, and restarted the ceilometer logging program at 16:54 UT.
Start	2006-11-04 10:00
End	2006-11-05 16:54
Added	2006-11-06 09:59
Author	DAH

[Data]

Number	212	Instrument: MST Radar. ZAKO rebooted the radar control and data acquisition PC leading to a short gap in observations.
Start	2006-11-06 09:15
End	2006-11-06 09:20
Added	2006-11-08 08:23
Author	DAH

[Data]

Number	213	Instrument: Ceilometer. The data acquisition PC stopped logging ceilometer data at 2006-11-09 10:00 UT, probably when the dial-up connection was being made to Fronmgoch to retrieve surface wind data. This was not spotted until 08:15 the following morning, when logging was resumed.
Start	2006-11-09 10:00
End	2006-11-10 08:15
Added	2006-11-10 08:18
Author	DAH

[Data]

Number	214	Instrument: MST Radar. The radar was powered down to allow students from the University of Wales Aberystwyth to carry out a surveying exercise on the antenna array.
Start	2006-11-14 13:40
End	2006-11-14 16:15
Added	2006-11-15 08:19
Author	DAH

[Data]

Number	215	Instrument: Laser Ceilometer. Data from the ceilometer stopped being acquired by the data logging PC. This is thought to have been caused by the same PC connecting to the Frongoch data logger via dial-up modem. The data acquisition program was restarted as soon as this was spotted - approximately 23 hours later.
Start	2006-11-20 10:00
End	2006-11-21 09:19
Added	2006-11-21 09:22
Author	DAH

[Data]

Number	216	Instrument: MST Radar. The radar control and data acquisition PC was rebooted leading to a small gap in observations.
Start	2006-11-23 16:20
End	2006-11-23 16:30
Added	2006-11-24 09:34
Author	DAH

[Data]

Number	217	Instrument: Laser Ceilometer. Data acquisition stopped at 10 UT on 2006-11-25 (a Saturday). This was not spotted until the following Monday morning (2006-11-27) leading to a loss of almost 48 hours of data.
Start	2006-11-25 10:00
End	2006-11-27 08:26
Added	2006-11-27 08:29
Author	DAH

[Data]

Number	270	Instrument: MST Radar. There was a brief gap in observations. There is no record, from the PC UPS, that the mains power was disrupted around this time although the radar was apparently not transmitting.
Start	2006-11-26 03:10
End	2006-11-26 03:20
Added	2007-05-16 12:24
Author	DAH

[Data]

Number	218	Atmospheric. A suspected tornado struck Bow Street, approximately 3 km to the north of the radar site, at around 01:15 UT. This caused isolated but severe damage to buildings. Although there is evidence (in the MST radar data) of convection around this time, there is nothing obvious to suggest that it is out of the ordinary. Frongoch surface wind data do show an increase in speed from around 6 m/s to 10 m/s around this time, but the higher speeds persist for at least an hour. The event appears to have been coincident with a surface cold front as the wind direction (in meteorological convention) changes from around 170 degrees to around 240 degrees at this time.
Start	2006-11-28 01:00
End	2006-11-28 01:30
Added	2006-11-29 10:21
Author	DAH

[Data]

Number	219	Instrument: MST Radar. The radar control and data acquisition PC was rebooted leading to a small gap in observations.
Start	2006-12-04 11:40
End	2006-12-04 11:45
Added	2006-12-05 08:18
Author	DAH

[Data]

Number	271	Atmospheric. ZAKO reported hearing thunder at around 09 UT.
Start	2006-12-07 09:00
End	2006-12-07 09:00
Added	2007-05-16 12:26
Author	DAH

[Data]

Number	220	Instrument: MST Radar. The radar control and data acquisition PC was rebooted leading to a small gap in observations.
Start	2006-12-13 09:25
End	2006-12-13 09:35
Added	2007-01-04 11:54
Author	DAH

[Data]

Number	221	Instrument: MST Radar. The radar control and data acquisition PC was rebooted leading to a small gap in observations.
Start	2006-12-20 10:00
End	2006-12-20 10:05
Added	2007-01-04 11:56
Author	DAH

[Data]

Number	223	Instrument: Laser Ceilometer. Data from the ceilometer stopped being acquired on 2006-12-22 at 10:00 UT, probably caused by the download of Frongoch surface wind data to the same PC. Since this occured over the Christmas period, the problem was not spotted (and the data acquisition was not re-started) until 2006-12-27.
Start	2006-12-22 10:00
End	2006-12-27 09:00
Added	2007-01-04 12:06
Author	DAH

[Data]

Number	222	Instrument: MST Radar. The radar control and data acquisition PC was rebooted leading to a small gap in observations.
Start	2006-12-29 09:50
End	2006-12-29 09:55
Added	2007-01-04 12:00
Author	DAH

[Data]

Number	272	Atmospheric. ZAKO reported hearing thunder at around 13 UT.
Start	2006-12-31 13:00
End	2006-12-31 13:00
Added	2007-05-16 12:29
Author	DAH

[Data]

Number	273	Atmospheric. ZAKO reported hearing thunder at around 16 UT.
Start	2007-01-01 16:00
End	2007-01-01 16:00
Added	2007-05-16 12:30
Author	DAH

[Data]

Number	224	Instrument: MST Radar. The radar control and data acquisition PC was rebooted leading to a small gap in observations.
Start	2007-01-08 09:05
End	2007-01-08 09:10
Added	2007-01-09 09:35
Author	DAH

[Data]

Number	225	Instrument: MST Radar. The usual collection of data was suspended twice - from 09:50 to 10:50 and from 16:30 to 18:00 - to allow DAH to carry out tests with the new radar control and data acquisition system.
Start	2007-01-17 09:50
End	2007-01-17 18:00
Added	2007-01-25 09:00
Author	DAH

[Data]

Number	226	Instrument: MST Radar. The usual collection of data was suspended to allow DAH to carry out tests with the new radar control and data acquisition system.
Start	2007-01-18 14:10
End	2007-01-18 16:10
Added	2007-01-25 09:02
Author	DAH

[Data]

Number	228	Instrument: Ceilometer. The normal acquisition of data was disrupted to allow DAH to investigate the possibility of recording backscatter profiles (in addition to the cloud base altitudes).
Start	2007-01-18 16:00
End	2007-01-18 17:00
Added	2007-01-25 09:25
Author	DAH

[Data]

Number	229	Instrument: Ceilometer. The normal acquisition of data was disrupted to allow DAH to investigate the possibility of recording backscatter profiles (in addition to the cloud base altitudes).
Start	2007-01-19 09:30
End	2007-01-19 10:50
Added	2007-01-25 09:26
Author	DAH

[Data]

Number	227	Instrument: Ceilometer. The normal recording of data from the ceilometer was disrupted by the download of Frongoch surface wind data by the data acquisition PC. Recording was restarted by DAH as soon as the problem was spotted.
Start	2007-01-24 10:00
End	2007-01-25 08:35
Added	2007-01-25 09:06
Author	DAH

[Data]

Number	274	Instrument: MST Radar. There was a short gap it observations to allow ZAKO to reboot the radar control and data acquisition PC.
Start	2007-01-25 11:00
End	2007-01-25 11:15
Added	2007-05-16 12:34
Author	DAH

[Data]

Number	275	Instrument: MST Radar. TX4 was briefly out of action to allow ZAKO to change the driver valve.
Start	2007-01-30 11:00
End	2007-01-30 12:00
Added	2007-05-16 12:36
Author	DAH

[Data]

Number	237	Instrument: MST Radar. Met Office quality control statistics for February 2007 show a slight, but noticeable, reduction in wind-profile data quality at all altitudes. The reduction is not sufficient to cause concern from the Met Office's point of view. It is possible that the statistics reflect the fact that the winds were highly variable over the course of the month. However, they could reflect the change over to the new data acquisition system at the beginning of the month. This situation will be monitored closely.
Start	2007-02-01 00:00
End	2007-02-28 23:59
Added	2007-03-26 09:03
Author	DAH

[Data]

Number	235	Instrument: Relative Humidity sensor. The sensor malfunctioned owing to corrosion on one of the pins. ZAKO removed the sensor at around 09:00 UT on 2007-03-23, cleaned it and replaced it at around 12:00 UT. The readings between 09:00 and 12:00 UT should consequently be ignored.
Start	2007-02-01 16:00
End	2007-03-23 12:00
Added	2007-03-26 08:47
Author	DAH

[Data]

Number	231	Instrument: MST Radar. The radar control and data acquisition PC was rebooted which resulted in a short gap in observations. ZAKO took the opportunity to switch the power feed for one of the transmitters to a UPS unit.
Start	2007-02-02 10:00
End	2007-02-02 10:15
Added	2007-02-05 09:51
Author	DAH

[Data]

Number	232	Instrument: Laser Ceilometer. The data logging PC stopped recording data from the laser ceilometer at the time of the download of surface wind data from Frongoch (via dial-up modem). This occurred on a Saturday morning and was not spotted until DAH checked for file availability shortly after 08:00 on 2007-02-05, the following Monday. He restarted the recording of data although the error messages indicated a test laser failure. No data were being recorded. The problem persisted after ZAKO switched the instrument off and then back on again. However, the instrument appears to be functioning correctly after ZAKO pressed the internal Reset button.
Start	2007-02-03 10:00
End	2007-02-05 09:40
Added	2007-02-05 10:20
Author	DAH

[Data]

Number	233	Instrument: MST Radar. There was a gap in observations to allow ZAKO to switch over from the old to the new radar control and data acquisition system. Initially the v3 data stream to the Met Office was blocked to allow DAH to check that all systems were integrated correctly. However, the automatic feed was re-enabled around 16:00 once it was clear that all was well. The main result of this switch over is that the production of v0 and v2 files has been discontinued. Only v3 processing software was adapted to operate on the netCDF spectral files created by the new acqusition system. Users should note that the signal powers in the v3 radial and Cartesian files have jumped by an offset of approximately 70 dB as a result of the way in which spectral data are now stored.
Start	2007-02-06 13:23
End	2007-02-06 13:44
Added	2007-02-07 12:26
Author	DAH

[Data]

Number	234	Instrument: MST Radar. The new data acquisition system was recording invalid data for the M-mode, i.e. covering the approximate altitude range 56 - 94 km. The reason for this is that the hardware pre-processing unit ignores observations between range gates 192 and 385, inclusive. A hint of this was found in the source code for the original acquisition system. However, it was only by chance that DAH found a document which stated this explicitly. Appropriate changes were made to the new acquisition program on 2007-02-14. Note that the ST mode data (i.e. covering the approximate altitude range 2 - 20 km) are not affected by this issue.
Start	2007-02-06 13:44
End	2007-02-14 13:01
Added	2007-03-06 14:04
Author	DAH

[Data]

Number	311	Instrument: MST Radar. Owing to a bug in the new MST radar control and data acquisition system, which began operations on 2007-02-06 13:44 UT, there has been an error of approximately 1 km in the reported ranges and altitudes of data products. The quality of the data appears to be otherwise unaffected. A compensation for this error was introduced to the signal processing software, starting at 2008-02-07 12:48 UT. A fix for the radar control and data acquisition software will need to be applied in the near future.
Start	2007-02-06 13:44
End	2008-02-07 12:48
Added	2008-03-10 09:35
Author	DAH

[Data]

Number	236	Instrument: Laser Ceilometer. The recording of ceilometer data was interrupted by the download of surface wind data from Frongoch. ZAKO spotted the problem and restarted the data acquisition program. This is the first time that this problem has occurred for over a month. Previously it was happening approximately once every 10 days.
Start	2007-03-21 10:00
End	2007-03-21 12:48
Added	2007-03-26 08:53
Author	DAH

[Data]

Number	238	Instrument: MST Radar. The data weighting window used in the derivation of radar return Doppler spectra was switched from the Hanning to the Rectangular. This was because of a slight (but noticeable) reduction in wind-profile data quality statistics (supplied by the Met Office) for the month of February, when the new data acquisition system (which was using the Hanning window) began operations. Observations using the Rectangular window will continue until at least mid-May when Met Office data quality statistics for April are made available.
Start	2007-04-02 07:32
End	2007-04-02 07:33
Added	2007-04-02 09:06
Author	DAH

[Data]

Number	239	Instrumnet: MST Radar. Owing to a typing error in setting up the new MST radar schedule, one of the dwells (for the SE6 beam - number 13) was missed from the observation cycle. This is likely to have had only a minor effect on data quality since it would only have prevented complemntary beam checking to be applied.
Start	2007-04-02 07:32
End	2007-04-03 07:42
Added	2007-04-03 08:46
Author	DAH

[Data]

Number	240	Instrument: MST Radar. The altitude coverage of wind-profiles provided by the radar reduced significantly at around 05:30 UT on 2007-04-05 (a Thursday). This was not immediately apparent as a problem since variations in altitude coverage are commonly associated with changes in atmospheric structure. However, the altitude coverage was reduced to a very low level on 2007-04-06. Since this was Good Friday, the problem was not spotted by DAH until the following Tuesday, 2007-04-10 (Monday having also been a Bank Holiday), by which time the problem was less sever. The source of the problem was not immediately apparent. The radar return spectra suggested that reliable profiles (with good radial continuity) should be obtainable over a much greater altitude range. This prompted DAH to check the status of the dynamic signal processing. It turns out that dwells were not being archived once they had been finished with. The backlog stretched back to 2007/04/03 06 UT. This could have caused the time-continuity checks for the most recent data to have been performed against an inappropriate (out of date) reference. The prevalence of high pressure conditions over the past several days meant that the wind conditions had not changed sufficiently for the time continuity tests to have failed completely. DAH cleared the blockage at around 10:43 UT on 2007-04-10.
Start	2007-04-05 05:30
End	2007-04-10 11:00
Added	2007-04-10 12:28
Author	DAH

[Data]

Number	241	Instrument: Laser Ceilometer. Data recording stopped when the data acquisition PC initiated a dial-up connection to download wind data from Frongoch. DAH restarted the recording of ceilometer data as soon as the problem was spotted the following morning.
Start	2007-04-10 10:00
End	2007-04-11 08:16
Added	2007-04-11 08:19
Author	DAH

[Data]

Number	246	Instrument: MST Radar. The radar experienced interference, although this did not contaminate the wind data.
Start	2007-04-13 23:00
End	2007-04-13 23:59
Added	2007-04-25 10:10
Author	DAH

[Data]

Number	247	Instrument: MST Radar. The radar experienced interference between 00:00 and 02:00 UT and between 23:00 and 23:59 UT. This did not contaminate the wind data in either case.
Start	2007-04-14 00:00
End	2007-04-14 23:59
Added	2007-04-25 10:13
Author	DAH

[Data]

Number	242	Instrument: MST Radar. The radar experienced a number of periods of interference - notably between 00:00 and 02:00 UT and between 12:00 and 22:00 UT. Although this did not lead to contamination of the wind data, it did lead to a number of data gaps at around 01:00, 12:00, 14:00, 15:00, 16:00 and 21:00 UT.
Start	2007-04-15 00:00
End	2007-04-15 23:59
Added	2007-04-19 08:12
Author	DAH

[Data]

Number	243	Instrument: MST Radar. The radar experienced a number of periods of interference during this 3 hours interval. The v3 signal processing was largely effective at blanking its effects.
Start	2007-04-16 14:50
End	2007-04-16 18:10
Added	2007-04-19 08:15
Author	DAH

[Data]

Number	244	Instrument: MST Radar. The radar experienced interference which mostly had no effect on the wind data. There were two short periods - one at around 15:00 UT and the second at around 19:00 UT - when blanking of vertical beam data resulted.
Start	2007-04-18 14:30
End	2007-04-18 19:30
Added	2007-04-19 08:17
Author	DAH

[Data]

Number	248	Instrument: MST Radar. The radar experienced interference although this had not impact on the wind profile data.
Start	2007-04-19 15:40
End	2007-04-19 19:00
Added	2007-04-25 10:53
Author	DAH

[Data]

Number	245	Instrument: Humidity Sensor. The sensor, which has experienced problems caused by corrosion in the recent past, has once again stopped supplying data. NOTE: this sensor is now beyond repair and will not be replaced directly. A new surface met station will be installed instead. Any apparent readings of RH after this date (2007-04-23) are caused by floating voltages at the data logger input.
Start	2007-04-23 21:00
End	2007-04-23 23:59
Added	2007-04-24 08:19
Author	DAH

[Data]

Number	304	Instrument: Relative Humidity probe. This suffered from corrosion and had stopped working on a number of occasions. It was removed after 2007-04-23. A new probe was installed on 2007-12-12.
Start	2007-04-23 21:00
End	2007-12-12 10:40
Added	2008-01-17 14:52
Author	DAH

[Data]

Number	250	Instrument: MST Radar. ZAKO spotted that the choke on TX1 had burnt out and that the extractor fan had seized on TX4, causing the latter to overheat and consequently to switch off. He replaced the faulty components and returned all TXs to operational status by 13:00 UT.
Start	2007-05-09 00:00
End	2007-05-09 13:00
Added	2007-05-14 16:33
Author	DAH

[Data]

Number	249	Instrument: MST Radar. ZAKO briefly powered down TX2 so that he could attach it to a new UPS unit. However, the TX tripped within a few seconds each time that it was connected to the UPS. ZAKO eventually just reconnected the TX to its mains supply and it functioned normally.
Start	2007-05-14 09:00
End	2007-05-14 10:00
Added	2007-05-14 16:16
Author	DAH

[Data]

Number	251	Instrument: MST Radar. The radar experienced two periods of interference: the first between 16:20 and 20:20 UT and the second between 21:30 and 23:10 UT. Although the reliability flagging was largely effective at blanking the wind-profile data for this period, some contaminated data were sent to the Met Office.
Start	2007-05-15 16:20
End	2007-05-15 23:10
Added	2007-05-16 09:50
Author	DAH

[Data]

Number	277	Instrument: MST Radar. The radar was powered down to allow ZAKO to clear up the cabling associated with TX3. This is in anticipation of powering TX3 from a UPS unit which will be mounted directly underneath it.
Start	2007-05-16 14:05
End	2007-05-16 15:02
Added	2007-05-17 15:35
Author	DAH

[Data]

Number	278	Instrument: MST Radar. The radar experienced a prolonged period of interference. The v3 signal processing was doing a reasonable job of blanking the horizontal winds for this period although the vertical velocities appear to be contaminated. ZAKO and DAH blocked the transmission of data to the BADC and to the Met Office between 11:30 and 13:30 UT on 2007-05-18 whilst they undertook a series of tests to establish the cause of the problem. Switching receivers had no effect and the problem persisted when the the radar was operated with only one tranmsmitter at a time - except in the case of TX5, which was being used to phase-lock all 5 transitters. Consequently ZAKO switched phase-locking to TX2 and restarted the radar with all transmitters operating (and using the original receiver). This solved the problem. It is noted that this is a different type of interefence (denoted type-2) to the one which was commonly observed during 2006 (type-1). The latter is thought to be caused by an internal oscillation in the receive side of the radar system brought about by high temperatures. V3 processing contains a special algorithm to detect and to avoid type-1 interference, which is consequently much less of a problem even though it is much more commonly occurring. ssing software to give he Met Office to block the sending of wind-profile
Start	2007-05-17 11:00
End	2007-05-18 13:20
Added	2007-05-21 09:59
Author	DAH

[Data]

Number	276	Instrument: MST Radar. A change has been made to the one of the criteria for producing wind-profile data for 30-minute average Met Office messages. For each range gate there must now be a minimum of 3 (rather than just 1) single-cycle data points flagged as being reliable. This is an attempt to decrease the possibility of interference contamination contributing to Met Office messages, as happened on 2007-05-15.
Start	2007-05-17 14:19
End	2007-05-17 14:19
Added	2007-05-17 15:29
Author	DAH

[Data]

Number	279	Instrument: Wind Sensors. A problem with the phone line to Frongoch prevented the data logging PC establishing a connection to the wind sensor data logger after the download on 2007-05-29. On 2007-06-05, BT engineers established that there was a fault on the line 2 miles from Fronch and it was possible to establish a connection to the data logger that afternoon. Owing to the fact that the data logger can hold less than 3 days' worth of data before it starts to overwrite the oldest data, it was only possible to download the data as far back as 2007-06-02 23:00.
Start	2007-05-29 10:00
End	2007-06-02 23:00
Added	2007-05-31 08:17
Author	DAH

[Data]

Number	280	Instrument: MST Radar. The radar experienced two short periods of interference. The v3 signal processing was largely effective at blanking the data although some contamination remained in the 30 minute messages sent to the Met Office.
Start	2007-06-24 07:50
End	2007-06-24 12:00
Added	2007-06-25 09:14
Author	DAH

[Data]

Number	281	Instrument: Rain Gauge. No rain was recorded since 2007-06-24 10 UT although sky camera images for the first week of July 2007 suggest that it has rained at site. ZAKO investigated the unit on 2007-07-17 and found that ants had made a nest under the bucket. The tipping mechanism was covered in fine soil. ZAKO cleaned the unit and it was returned to working order at 10 UT.
Start	2007-06-24 10:00
End	2007-07-17 10:00
Added	2007-07-06 09:05
Author	DAH

[Data]

Number	282	Instrument: Laser Ceilometer. The date field in the cloud base messages output by the ceilometer has contained the number "0" rather than appropriate month since 04:26 on 2007-07-03. DAH stopped and then restarted the acquisition program on 2007-07-11 but this did not resolve the problem. ZAKO power-cycled the instrument on 2007-07-20 and this similarly had no effect. DAH implemented a fix for this in the software which produces the NASA-Ames files, but this ceased to work at the beginning of August (when the month field started to show "1"). DAH introduced an updated software fix on 2007-08-03.
Start	2007-07-03 04:26
End	2007-08-03 12:00
Added	2007-07-11 14:17
Author	DAH

[Data]

Number	283	Instrument: MST Radar. ZAKO disconnected TX4 for which the induction on the driver valve had burnt out. The radar appears to have operated in an unstable fashion during this period, although much of the wind-profile data was blanked by the signal processing. It is not clear when the problem occurred with the transmitter. It will have contributed to the fact that altitude coverage has been reduced of late. Coverage increased noticeably when TX4 was returned to operation.
Start	2007-07-18 09:00
End	2007-07-18 11:45
Added	2007-07-19 08:42
Author	DAH

[Data]

Number	285	Instrument: Surface-met sensors. The data logging PC was unable to establish a connection with the surface met sensor logger for almost 2 weeks. The problem was apparently caused by water leaking into the logging box, which is located outside. Although this does not appear to have damaged the logging unit itself, it did affect the communications port. No data appear to have been lost during this period, although they have been delayed in appearing on the BADC.
Start	2007-08-28 00:00
End	2007-09-11 12:22
Added	2007-09-11 13:07
Author	DAH

[Data]

Number	284	Instrument: Sky-Camera. There is an approximately 24 hour gap in observations resulting from the power lead to the camera accidentally being disconnected.
Start	2007-09-10 11:08
End	2007-09-11 11:06
Added	2007-09-11 12:22
Author	DAH

[Data]

Number	287	Instrument: Ceilometer. DAH resynchronised the time of the ceilometer's internal clock, which had been running approximately 2 minutes and 10 s behind UT.
Start	2007-09-12 14:55
End	2007-09-12 14:55
Added	2007-09-14 16:03
Author	DAH

[Data]

Number	286	Instrument: Sky-Camera. There are a few missing images during the time when DAH was updating the Axis firmware from version 4.30 to 4.40. Unexpectedly this upgrade caused the colour bias of the image to change from a yellow-grey to a bluey-grey under overcast conditions. However, it did appear to improve the distinction between overlapping clouds.
Start	2007-09-12 16:15
End	2007-09-12 16:19
Added	2007-09-14 15:58
Author	DAH

[Data]

Number	288	Instrument: Surface-met sensors. The problem connecting to the surface met sensor data logger, which first occurred on 2007-08-28, again prevented the download of surface met data. The logger and communications were sent back to Campbell Scientific for repairs. They have now been re-installed, though any data prior ot 09:53 UT on 2007-10-03 should be ignored.
Start	2007-09-18 02:00
End	2007-10-03 09:53
Added	2007-09-20 09:47
Author	DAH

[Data]

Number	289	Instrument: Surface wind sensors. The clock on the data logging PC was found to have been running slow. Although the PC had been set up to synchronise its clock using Network Time Protocol, this had not been happening and so the clock was approximately 7 minutes behind actual time (its clock showed 09:46 when it was resynchronised at 09:53 UT on 2007-10-03). This will have affected both the surface met and surface wind data loggers, which synchronise their clocks to that of the PC. Note that the surface met sensor data logger was only re-installed, after being sent away for repairs, on 2007-10-03.
Start	2007-10-03 09:46
End	2007-10-03 09:53
Added	2007-10-04 08:20
Author	DAH

[Data]

Number	290	Instrument: MST Radar. The radar was out of action to allow tests to be conducted for the Phase-II data acquisition system. A small problem associated with the restarting of the current data acquisition system resulted in subsequent observations not being processed until a data blockage was removed on the morning of 2007-10-09. No data were lost by this.
Start	2007-10-08 15:13
End	2007-10-08 19:33
Added	2007-10-10 18:15
Author	DAH

[Data]

Number	291	Instrument: MST Radar. The radar was out of action to allow tests to be conducted for the Phase-II data acquisition system.
Start	2007-10-09 09:20
End	2007-10-09 14:32
Added	2007-10-10 18:18
Author	DAH

[Data]

Number	292	Instrument: MST Radar. The radar was out of action to allow tests to be conducted for the Phase-II data acquisition system. The radar was restarted using an updated version (0.3) of the current data acquisition system.
Start	2007-10-10 14:33
End	2007-10-10 14:58
Added	2007-10-10 18:20
Author	DAH

[Data]

Number	293	Instrument: MST Radar. The radar appears to have suffered two short periods of intereference: one around 01:20 UT, the second around 09:00 UT - and possibly a third around 21:10 UT. None of these contaminated the wind data.
Start	2007-10-17 00:00
End	2007-10-17 23:00
Added	2007-10-19 08:52
Author	DAH

[Data]

Number	294	Instrument: MST Radar. The radar suffered from two short periods of interference: one at around 11:00 UT and the second at around 20:30 UT. Neither caused contamination of the winds.
Start	2007-10-18 10:30
End	2007-10-18 21:00
Added	2007-10-19 08:54
Author	DAH

[Data]

Number	295	Instrument: MST Radar. The radar suffered from two short periods of interference: one at around 10:30 UT and the second at around 21:45 UT. Neither caused contamination of the winds.
Start	2007-10-19 10:00
End	2007-10-19 22:00
Added	2007-10-25 14:10
Author	DAH

[Data]

Number	296	Instrument: MST Radar. The radar suffered from a short period of interference between 11:00 and 12:10 UT. This did not cause contamination of the winds.
Start	2007-10-20 11:00
End	2007-10-20 12:10
Added	2007-10-25 14:11
Author	DAH

[Data]

Number	297	Instrument: MST Radar. The radar suffered from a short period of interference at around 05:00 UT. This did not cause contamination of the winds.
Start	2007-10-21 04:45
End	2007-10-21 05:15
Added	2007-10-25 14:13
Author	DAH

[Data]

Number	298	Instrument: MST Radar. The radar suffered from two short periods of interference: one at around 00:15 UT and the second at around 08:30 UT. Neither caused contamination of the winds.
Start	2007-10-22 00:00
End	2007-10-22 09:00
Added	2007-10-25 14:15
Author	DAH

[Data]

Number	299	Instrument: MST Radar. The radar suffered from a short period of interference at around 05:00 UT. This did not cause contamination of the winds.
Start	2007-10-23 20:30
End	2007-10-23 21:15
Added	2007-10-25 14:16
Author	DAH

[Data]

Number	300	Instrument: MST Radar. The radar suffered from a short period of interference at around 12:00 UT. This did not cause contamination of the winds.
Start	2007-10-24 11:30
End	2007-10-24 12:30
Added	2007-10-25 14:17
Author	DAH

[Data]

Number	301	Instrument: MST Radar. The radar was not collecting any useful data although it was still nominally running. This follows ZAKO having removed unnecessary T-connectors from the back of the receiver. The "TX-Phase" cable was "on" but not "locked-in".
Start	2007-10-29 12:56
End	2007-10-31 09:26
Added	2007-10-30 12:21
Author	DAH

[Data]

Number	302	Instrument: MST Radar. The radar began to malfunction overnight during several distinct periods. The spectra show that this is not caused by interference. Spectral features appear smeared out in range as though the range resolution has been reduced. DPW checked the goodness of a number of cable connections and power cycled the receiver units before observations were re-started.
Start	2007-10-31 21:45
End	2007-11-01 10:25
Added	2007-11-01 10:33
Author	DAH

[Data]

Number	305	Instrument: MST Radar. The radar was powered down for 2 hours to allow MSc students from the University of Aberystwyth to carry out a surveying practical on the antenna array.
Start	2007-11-27 13:50
End	2007-11-27 15:50
Added	2008-01-18 12:25
Author	DAH

[Data]

Number	303	Instrument: MST Radar. The radar developed an instability overnight, which was apparent in the scope trace on either the I or the Q channel output of the receiver. It's not clear which - but only one channel was affected. This was causing contamination of the wind profile data. DAH blocked data being sent to the Met Office at around 08 UT, but the radar continued to run until about 11:30 when DPW assisted him (remotely) to switch the receiver units off and then on again. This failed to solve the problem of the first few attempts. However, DPW eventually disconnected and then re-connected various wires from the receiver. The problem was gone when the radar was restarted at around 12:15.
Start	2007-11-29 00:00
End	2007-11-29 12:15
Added	2007-11-29 09:53
Author	DAH

[Data]

Number	306	Instrument: MST Radar. The radar was powered down to allow ZAKO to carry out an inspection of the antenna relays.
Start	2008-01-30 11:10
End	2008-01-30 16:15
Added	2008-02-05 08:19
Author	DAH

[Data]

Number	307	Instrument: MST Radar. The radar was powered down to allow ZAKO to replace some of the antenna relays.
Start	2008-02-04 11:45
End	2008-02-04 16:15
Added	2008-02-05 08:21
Author	ZKO

[Data]

Number	308	Instrument: MST Radar. The radar was powered down to allow ZAKO to replace some of the antenna relays.
Start	2008-02-05 09:10
End	2008-02-05 15:00
Added	2008-02-06 08:27
Author	DAH

[Data]

Number	309	Instrument: MST Radar. The radar was powered down to allow ZAKO to replace some of the antenna relays.
Start	2008-02-06 09:30
End	2008-02-06 12:15
Added	2008-02-07 07:58
Author	DAH

[Data]

Number	312	Instrument: MST Radar. There was a gap in observations to allow DAH to implement hacks to compensate for the problem with altitudes being out by almost 1 km.
Start	2008-02-07 11:00
End	2008-02-07 12:50
Added	2008-03-10 09:56
Author	DAH

[Data]

Number	310	Instrument: signal processing PC "Claudius" and Sky-camera. The hard drive on Claudius became filled early on 2008-02-10, a Sunday, which prevented new data being acquired. This lead to a gap in sky-camera images. No MST radar observations were lost, although they could not be processed until DAH cleared some disc space the following day.
Start	2008-02-10 05:56
End	2008-02-11 09:45
Added	2008-03-10 09:26
Author	DAH

[Data]

Number	313	Instrument: MST Radar. The radar operated unstably. This caused the signal processing to blank most of the wind-profile data.
Start	2008-02-12 08:30
End	2008-02-12 16:00
Added	2008-03-10 10:02
Author	DAH

[Data]

Number	314	Instrument: MST Radar. The radar operated unstably causing the signal processing to blank most of the wind-profile data.
Start	2008-02-14 00:00
End	2008-02-14 04:00
Added	2008-03-10 10:04
Author	DAH

[Data]

Number	315	Instrument: MST Radar. The radar operated unstably for a short period. The signal processing blanked the wind-profile data during this time.
Start	2008-02-17 02:00
End	2008-02-17 03:00
Added	2008-03-10 10:06
Author	DAH

[Data]

Number	316	Instrument: MST Radar. The radar appears to have suffered a loss of transmitter power, which gave rise to reduced altitude coverage.
Start	2008-02-19 15:30
End	2008-02-19 16:50
Added	2008-03-10 11:23
Author	DAH

[Data]

Number	317	Instrument: MST Radar. The radar appears to have suffered a loss of transmitter power, which gave rise to reduced altitude coverage.
Start	2008-02-19 22:00
End	2008-02-20 11:10
Added	2008-03-10 11:24
Author	DAH

[Data]

Number	318	Instrument: Surface-wind sensors. It was not possible to establish a dial up connection to Frongoch from some time on 2008-02-29 (probably in the afternoon) until approximately 10:15 on 2008-03-03. It turns out that BT disconnected the line as part of the transfer of billing from Aberystwyth University to RAL. When the line was re-established, it was possible to download all but 12 hours of the data backlog.
Start	2008-02-29 09:50
End	2008-02-29 22:00
Added	2008-03-10 11:47
Author	DAH

[Data]

Number	319	Instrument: MST Radar. When the billing for the MSTRF telephone lines was transferred from Aberystwyth University to RAL, the broadband connection was broken on the morning of 2008-03-05 and not re-established until around 10 UT on 2008-03-07. Although this did not stop the radar from running, or the observations from being processed, it did cause a data blockage. This caused the time-continuity flagging to compare the most recent observations with all previous observations made since 2008-03-05. This means that most of the wind-profile data are blanked out. This problem should be removed when the observations are reprocessed off-line. DAH cleared the blockage around 13:10 on 2008-03-08.
Start	2008-03-05 08:10
End	2008-03-08 13:10
Added	2008-03-10 12:26
Author	DAH

[Data]

Number	320	Instrument: MST Radar, Ceilometer, Sky-camera. There was a power cut at the MST Radar site between approximately 11:00 and 15:30 UT. DPW informed DAH of the problem shortly after the power was lost, allowing DAH to stop the MST radar (which is powered through UPS units) in a controlled way. DAH later restarted the radar from home. The aquisition of ceilometer and sky-camera data was interrupted when the UPS units became discharged and was resumed automatically when the power returned. All PCs appear to have restarted automatically.
Start	2008-03-31 11:00
End	2008-03-31 17:24
Added	2008-04-01 11:49
Author	DAH

[Data]

Number	321	Instrument: MST Radar. The radar suffered a short period of interference. This does not appear to have contaminated the wind-profile data.
Start	2008-04-04 00:50
End	2008-04-04 02:30
Added	2008-04-07 14:02
Author	DAH

[Data]

Number	322	Instrument: MST Radar. The radar suffered a short period of interference. This does not appear to have contaminated the wind-profile data.
Start	2008-04-04 15:30
End	2008-04-04 19:00
Added	2008-04-07 14:03
Author	DAH

[Data]

Number	323	Instrument: MST Radar. The radar suffered a short period of interference. This does not appear to have contaminated the wind-profile data.
Start	2008-04-05 13:30
End	2008-04-05 19:10
Added	2008-04-07 14:04
Author	DAH

[Data]

Number	324	Instrument: MST Radar. The beam steering unit became stuck in an off-vertical pointing direction, apparently as a result of a short circuit in relay box 39. This caused all Cartesian data products to be corrupted for this period.
Start	2008-04-14 20:30
End	2008-04-15 08:18
Added	2008-04-15 10:32
Author	DAH

[Data]

Number	326	Instrument: MST Radar. The radar suffered from interference. This was largely eliminated by the signal processing, though some contamination is evident in the wind-profile data at around 08 - 09 UT.
Start	2008-04-23 06:00
End	2008-04-23 10:40
Added	2008-04-28 13:42
Author	DAH

[Data]

Number	325	Instrument: Tipping bucket raingauge. ZAKO dismantled and cleaned the bucket to remove a partial blockage. The apparent rain spike around 12:00 UT was caused by him pouring water into the mechanism to test it. It is not clear when the raingauge was last working reliably.
Start	2008-04-23 11:45
End	2008-04-23 12:15
Added	2008-04-28 08:42
Author	DAH

[Data]

Number	327	Instrument: MST Radar. The radar suffered from interference in three separate periods: 03:30 - 07:00, 11:30 - 13:00, and 17:30 - 19:00. None of these appears to have caused any contamination of the wind-profile data.
Start	2008-04-24 03:30
End	2008-04-24 19:00
Added	2008-04-28 13:48
Author	ZKO

[Data]

Number	328	Instrument: MST radar. The radar suffered from interference, although this appears to have caused contamination of the wind-profile data only for the limited period 04:00 - 06:00 UT.
Start	2008-04-25 03:20
End	2008-04-25 08:00
Added	2008-04-28 13:51
Author	DAH

[Data]

Number	329	Instrument: MST radar. The radar suffered from interference for several hours, although this appears to have caused contamination of the wind-profile data only for the limited period 23:30 - 23:59 UT.
Start	2008-04-25 18:30
End	2008-04-25 23:59
Added	2008-04-28 13:52
Author	ZKO

[Data]

Number	330	Instrument: MST Radar. The radar suffered from interference, although this did not cause any contamination of the wind-profile data.
Start	2008-04-26 00:00
End	2008-04-26 01:00
Added	2008-04-28 13:58
Author	DAH

[Data]

Number	331	Instrument: MST Radar. The radar suffered a short period of interference, although this appears to have caused only minor contamination of the wind-profile data.
Start	2008-04-27 11:30
End	2008-04-27 13:30
Added	2008-04-28 14:00
Author	DAH

[Data]

Number	332	Instrument: MST Radar. The radar suffered a short period of interference, although this appears to have caused only minor contamination of the wind-profile data.
Start	2008-04-27 19:30
End	2008-04-27 20:30
Added	2008-04-28 14:01
Author	DAH

[Data]

Number	333	Instrument: MST Radar. The radar suffered a period of interference, although this appears to have been successfully blanked by the signal processing.
Start	2008-04-28 13:50
End	2008-04-28 19:00
Added	2008-05-07 08:10
Author	DAH

[Data]

Number	334	Instrument: MST Radar. The radar suffered from two short periods of interference, one around 11:00 UT and the second around 17:30. In both cases the signal processing was successful in avoiding contamination of the wind-profile data.
Start	2008-04-29 10:50
End	2008-04-29 18:00
Added	2008-05-07 08:12
Author	DAH

[Data]

Number	335	Instrument: MST radar. The radar suffered from a short period of interference. However, the signal processing prevented the wind-profile data from being contaminated.
Start	2008-05-01 10:30
End	2008-05-01 11:10
Added	2008-05-07 08:14
Author	DAH

[Data]

Number	336	Instrument: MST Radar. The radar suffered from two periods of interference - the first 00:00 - 01:40 UT and the second 07:20 - 08:20 UT. In both cases the signal processing prevented the wind-profile data from being contaminated.
Start	2008-05-02 00:00
End	2008-05-02 08:20
Added	2008-05-07 08:19
Author	DAH

[Data]

Number	337	Instrument: MST Radar. The radar suffered from two periods of interference, the first 00:00 - 01:30 UT and the second 09:00 - 09:40 UT. In both cases the signal processing was successful in preventing contamination of the wind-profile data.
Start	2008-05-05 00:00
End	2008-05-05 09:40
Added	2008-05-07 08:22
Author	DAH

[Data]

Number	338	Instrument: WXT510 met sensors. The unit ceased to record any precipitation after 2008-04-15, despite the fact that it is known to have rained since then. The unit was powered down for 2 hours, during which time ZAKO washed the bird-crap off the piezo-electric precipitation sensor. Although it seems more likely that the problem was caused within the electronics, it is conceivable that a crust on top of the sensor might reduce its sensitivity to rain.
Start	2008-06-10 08:42
End	2008-06-10 10:55
Added	2008-06-10 12:27
Author	DAH

[Data]

Number	339	Instrument: All. An unexpected power cut occurred at around 10:45 UT. ZAKO, who was on site, informed DAH, who was able to shut down the radar and the computers cleanly at around 11:00 UT. The power returned at around 12:00 UT. However, DAH was not able to restart all data acquisition programs until around 14:00 UT.
Start	2008-07-04 11:00
End	2008-07-04 14:00
Added	2008-07-04 16:09
Author	DAH

[Data]

Number	340	Instrument: Tipping bucket raingauge. There was a heavy downpour at around 2008-07-18 15:05. However, the tipping bucket raingauge did not record anything. ZAKO dismantled and cleaned the unit and returned it to serive at around 2008-07-18 15:20 UT. The last time that there was a clear indication of rain was shortly before 2008-07-11 16:00.
Start	2008-07-11 16:00
End	2008-07-18 15:20
Added	2008-07-24 11:50
Author	DAH

[Data]

Number	344	Instrument: Tipping bucket raingauge. The raingauge did not record any rain (except for one tip at 2008-07-29 15:30) during this period although it is thought to have rained. Rain drops are certainly visible in sky-camera images around 2008-07-29 16:00, although the duration of the event may have been too short to accumulate enough rain for a tip. ZAKO inspected the instrument on 2008-07-30 and found that a large black snail had taken residence in the saddle of the tipping mechanism. He removed this and poured 2 litres of water through the system at around 09:00 UT.
Start	2008-07-20 21:00
End	2008-07-30 10:00
Added	2008-08-04 08:28
Author	DAH

[Data]

Number	341	Instrument: All. There appears to have been a mains power failure at the site at 17:08 UT. The data acquisition PCs continued to run for approximately 20 minutes before the UPS became discharged. Although all machines came back up cleanly, the MST radar data acquisition and the WXT510 data logging programs did not restart automatically. DAH started them manually the next day.
Start	2008-07-23 17:08
End	2008-07-23 18:13
Added	2008-07-24 14:20
Author	DAH

[Data]

Number	342	Instrument: MST Radar. An approximately 1 hour long power failure (starting at 2008-07-23 17:08) caused all instruments to shut down. Although the MST radar control and data acquisition PC (Augustus) came back up cleanly after the power was restored, radar and WXT510 programs did not start automatically. DAH spotted the fact that the radar was not running first thing on the mornming of the 2008-07-24. However, since it was not first clear that there had been a power cut, he tried rebooting Augustsus. This took a long time as the PC performed a full disk check. Consequently there was a delay in restarting the MST Radar and WXT510 until 11:18 UT.
Start	2008-07-23 17:31
End	2008-07-24 11:18
Added	2008-07-24 14:28
Author	DAH

[Data]

Number	343	Instrument: MST Radar. The radar was powered down owing to persistent thunderstorms in the Aberystwyth area. Although direct hits are rare, lightning can indirectly damage the radar through mains fluctuations and induced currents. The radar was restarted in the evening after the storms had passed.
Start	2008-07-29 15:19
End	2008-07-29 18:49
Added	2008-07-30 08:17
Author	DAH

[Data]

Number	345	Instrument: Tipping bucket raingauge. The raingauge did not record any rain during 2008-08-06 despite the fact that the was a mixture of light and heavy rain during the afternoon. DAH dismantled and cleaned the collecting unit and inflow pipe between 09 and 10 UT on 2008-08-07. The inflow pipe appeared to have been blocked by grass cuttings. DAH poured a cup of water into the collecting bowl at around 09:55 UT and could hear the tips of the bucket. However, the collecting bowl has become detatched from the base of the unit and since the two must be aligned for correct operation, the unit will beed to be glued together at a later date.
Start	2008-08-06 00:00
End	2008-08-07 10:58
Added	2008-08-07 11:02
Author	DAH

[Data]

Number	346	Instrument: Laser ceilometer. DAH reset the internal clock at 09:05 UT. It had been running approximately 45 s slow.
Start	2008-08-07 09:05
End	2008-08-07 09:05
Added	2008-08-07 11:40
Author	DAH

[Data]

Number	347	Instrument: MST Radar. The radar appears to have suffered from interference, although this did not contaminate the wind profiles.
Start	2008-08-07 14:00
End	2008-08-07 15:30
Added	2008-08-11 09:00
Author	DAH

[Data]

Number	348	Instrument: MST Radar. The radar appears to have suffered from interference. This caused only a minor contamination of the wind profiles at altitudes above 13 km.
Start	2008-08-08 10:30
End	2008-08-08 11:30
Added	2008-08-11 09:03
Author	DAH

[Data]

Number	349	Instrument: Tipping bucket raingauge. The instrument has continued to fail to register rain, despite recent attempts to fix it. The measurements between 10 and 11 UT were caused by the unit being dismantled - not by actual rain.
Start	2008-08-14 10:00
End	2008-08-14 11:00
Added	2008-08-26 15:29
Author	DAH

[Data]

Number	350	Instrument: Tipping bucket raingauge. ZAKO replaced the raingauge after re-gluing parts of the broken unit back together. The measurements between 10:00 and 10:30 UT were caused by him pouring water into the unti in order to test it. It now appears to be working correctly and measurements made later in the day correspond to actual rain fall. ZAKO has raised the base of the unit by 20 cm. It has gradually sunk into the ground over the past few years.
Start	2008-08-18 10:00
End	2008-08-18 10:30
Added	2008-08-26 15:33
Author	DAH

[Data]

Number	351	Instrument: MST Radar. The radar was powered down to allow ZAKO to carry out some work within the antenna array.
Start	2008-09-03 08:18
End	2008-09-03 10:13
Added	2008-09-04 08:07
Author	DAH

[Data]

Number	352	Instrument: MST Radar. The radar was powered down to allow ZAKO to carry out some work within the antenna array.
Start	2008-09-08 08:20
End	2008-09-08 10:15
Added	2008-09-09 08:09
Author	DAH

[Data]

Number	353	Instrument: Campbell Scientific tipping bucket raingauge. The raingauge had not recorded any rain since 2008-09-04, although the Vaisala WXT510 had done. ZAKO removed grass seeds, which had accumulated in the inlet and poured 1/2 litre of water in as a test (consequently the data from 09:00 - 09:40 UT should be ignored). This resulted in 46 tips, which compares well with the 92 tips produced by a litre of water in an earlier test.
Start	2008-09-10 09:00
End	2008-09-10 09:40
Added	2008-09-11 08:06
Author	DAH

[Data]

Number	354	Instrument: Wind sensors (Frongoch). No surface wind data were downloaded from Frongoch after 2008-09-25 10:00. DAH spotted this after he returned from leave on 2008-10-06. He contacted the Institute of Mathematics and Physics at Aberystwyth University as they also have equipment at Frongoch. They had noticed a loss in communications with the hut at around the same time. A member of staff visited the site and traced the cause of the problem to a blown fuse. This was fixed on 2008-10-07. However, DAH did not, at first, realise that the loss of power had caused the wind data logging unit to lose its acqusition program. He uploaded this, and normal logging was resumed, on 2008-10-09.
Start	2008-09-25 10:00
End	2008-10-09 11:15
Added	2008-10-10 08:26
Author	DAH

[Data]

Number	355	Instrument: UPS units. There was a thunderstorm in the general Aberystwyth area which caused the mains power to fail for approximately 2 minutes around 11:20. However, the UPS units and all equipment stayed up without a problem.
Start	2008-10-28 11:15
End	2008-10-28 11:25
Added	2008-10-29 10:03
Author	DAH

[Data]

Number	356	Instrument: Sky-camera. There was a gap in image capture for just over an hour during a reboot of the acquisition PC. If the computer has not been rebooted for several months, there is a lengthy disk checking process on the next start-up.
Start	2008-10-29 13:55
End	2008-10-29 15:20
Added	2008-10-30 08:02
Author	DAH

[Data]

Number	357	Instrument: MST Radar. The radar was powered down in order to permit a scheduled inspection of the antenna array.
Start	2008-10-30 13:50
End	2008-10-30 16:18
Added	2008-10-30 16:37
Author	DAH

[Data]

Number	358	Instrument: MST Radar. The beam steering unit became stuck in an off-vertical beam-pointing direction during the early hours of the morning. This resulted in a failure of the signal processing to be able to generate reliable wind-profile data. DAH spotted the problem at 08 UT and stopped the radar. ZAKO checked all of the components within the unit but was initially unable to find the source of the problem. There appeared to be an earth mismatch between the PC control output and the beam-steering unit itself. This led ZAKO to remove a legacy PDP-11 interface unit from the control system which solved the problem.
Start	2008-11-07 03:30
End	2008-11-07 15:10
Added	2008-11-07 14:25
Author	DAH

[Data]

Number	359	Instrument: WXT510. DAH rebooted the PC which controls the MST radar and which acquires data from the WXT510 on the morning of 2008-11-07 (a Friday). This was to take advantage of the fact that the radar had been powered down following the discovery of a problem. If the PC is left for a long time (i.e. several months) between restarts, it takes several tens of minutes to perform a disk check on reboot. This can be a problem after an unscheduled restart, e.g. following a power outage. However, DAH forgot to restart the program which records data from the WXT510. He did not spot this problem until the following Monday (2008-11-10).
Start	2008-11-07 08:36
End	2008-11-10 17:30
Added	2008-11-11 09:56
Author	DAH

[Data]

Number	360	Instrument: WXT510 rain sensor. No rain was measured between 2008-11-13 16:00 and 2008-11-17 12:00 UT, despite the fact that the tipping bucket rain gauge recorded heavy rain on 2008-11-14, persistent rain on 2008-11-15, and mild rain on 2008-11-16. The instrument was power cycled around 2008-11-17 12:00 UT and recorded rain later in the afternoon.
Start	2008-11-13 16:00
End	2008-11-17 12:00
Added	2008-11-18 08:17
Author	ZKO

[Data]

Number	361	Instrument: Electricity, MST Radar, Sky-Camera, WXT510. Manweb visited the site in order to install a new monitoring device on the electricity supply. This required the power to be cut for a short period of time. DAH powered down the radar control and signal processing PCs which resulted in short losses of sky-camera and WXT510 data in addition to the fact that the MST radar was shut down.
Start	2008-11-20 13:15
End	2008-11-20 13:39
Added	2008-11-21 08:24
Author	DAH

[Data]

Number	362	Instrument: MST Radar. One of the transmitters (TX2) drifted out of tune at some time around 06:00 UT on 2008-11-23, a Sunday. This was apparent from the wind data becoming flagged as being unreliable at the lowest few range gates. ZAKO fixed the problem by 10:00 the following day.
Start	2008-11-23 06:00
End	2008-11-24 10:00
Added	2008-11-26 08:24
Author	DAH

[Data]

Number	363	Instrument: Tipping Bucket Raingauge. The instrument recorded rain (mediumly heavy for a while) when the WXT510 showed nothing and the sky-camera images reveal almost completely clear skies. The reason for this erroneous reading is unknown.
Start	2008-11-25 10:00
End	2008-11-25 15:30
Added	2008-11-26 10:19
Author	DAH

[Data]

Number	364	Instrument: MST Radar. The radar suffered from interference on two occasions - the first between 00:30 and 03:30 UT and the second between 09:45 and 11:00 UT. Neither instance appears to have caused any contamination of the wind-profile data.
Start	2008-11-28 00:30
End	2008-11-28 00:30
Added	2008-12-01 10:34
Author	DAH

[Data]

Number	365	Instrument: MST Radar. There was a problem with the data from the lowest few range gates, principally between 03:00 and 11:30 UT, with some evidence of a repeat of the problem (albeit to a much lesser extent) after 15:00. This appears to be a repeat of the problem which first occurred on 2008-11-23. The quality control routines mostly blanked these portions and so there should be little (if any) contamination of the wind-profile data.
Start	2008-11-29 03:00
End	2008-11-29 23:59
Added	2008-12-01 11:24
Author	DAH

[Data]

Number	366	Instrument: MST Radar. There was a repeat of the problem first seen on 2008-11-23 which affects the data at the lowest 5 range gates. The problem appeared between 03:00 and 11:30 UT and then again between 18:45 and 23:59. There is evidence of contamination of the vertical velocities during these periods although the horizontal wind components are less affected. The problem has continued into 2008-12-01.
Start	2008-11-30 03:00
End	2008-11-30 23:59
Added	2008-12-01 11:29
Author	DAH

[Data]

Number	367	Instrument: MST Radar. The receiver signals continued to be contaminated at the lowest 5 range gates. This is only apparent in the vertical velocities, which were mostly flagged as being reliable, whereas the quality control was more effective at blanking the horizontal wind components. The problem disappeared without any changes being made to the radar.
Start	2008-12-01 00:00
End	2008-12-01 12:30
Added	2008-12-02 08:15
Author	DAH

[Data]

Number	368	Instrument: MST Radar. The radar was powered down for 2 hours to allow students from Aberystwyth University to carry out a surveying practical on the antenna array.
Start	2008-12-02 13:30
End	2008-12-02 15:29
Added	2008-12-02 16:17
Author	DAH

[Data]

Number	369	Instrument: MST Radar. The radar appears to have suffered from interference, primarily between 10:00 and 15:00 UT and then again between 21:00 and 23:59 UT. This lead to only a very small amount of contamination of the wind-profile data between 21:30 and 22:30 at a few altitude gates above 18 km. It also lead to a reduction in useful altitude coverage at around 11:00 UT.
Start	2008-12-04 10:00
End	2008-12-04 23:59
Added	2008-12-05 09:33
Author	DAH

[Data]

Number	370	Instrument: MST Radar. The radar suffered from interference, although this was mostly filtered out by the automatic quality control algorithms. It caused only minor contamination of the wind-profile data at the highest range gates.
Start	2008-12-05 00:00
End	2008-12-05 02:40
Added	2008-12-08 08:35
Author	DAH

[Data]

Number	371	Instrument: MST Radar. The radar suffered from interference, although this was mostly filtered out by the automatic quality control algorithms. It caused only minor contamination of the wind-profile data at the highest range gates.
Start	2008-12-05 09:20
End	2008-12-05 11:00
Added	2008-12-08 08:35
Author	DAH

[Data]

Number	372	Instrument: MST Radar. Spectra at the lowest range gates were affected by a form of contamination which has been seen on several occasions during the past 3 weeks. Mostly this was dealt with by the automatic quality control although sporadic contamination of the wind-profile data is evident.
Start	2008-12-07 02:00
End	2008-12-07 12:00
Added	2008-12-08 08:39
Author	DAH

[Data]

Number	373	Instrument: MST Radar. The radar suffered from interference. Although this does not appear to have resulted in contamination of the wind-profile data, it did lead to a reduction in useful altitude cover.
Start	2008-12-08 07:50
End	2008-12-08 09:20
Added	2008-12-09 09:39
Author	DAH

[Data]

Number	374	Instrument: MST Radar. The radar suffered from interference. Although this does not appear to have resulted in contamination of the wind-profile data, it did lead to a reduction in useful altitude cover.
Start	2008-12-08 18:50
End	2008-12-08 20:40
Added	2008-12-09 09:39
Author	DAH

[Data]

Number	375	Instrument: MST Radar. The radar suffered from a short period of interference. This does not appear to have contaminated the wind-profile data but did lead to a brief loss of coverage.
Start	2008-12-09 11:20
End	2008-12-09 12:10
Added	2008-12-10 08:25
Author	DAH

[Data]

Number	376	Instrument: MST Radar, Ceilometer, WXT510. All computers and instruments were powered down to allow work to be carried out on the mains electricity supply to the site.
Start	2008-12-10 10:10
End	2008-12-10 13:47
Added	2008-12-11 08:10
Author	DAH

[Data]

Number	377	Instrument: MST radar. The radar suffered a short period of interference. This does not appear to have contaminated the wind-profile data.
Start	2008-12-10 14:30
End	2008-12-10 15:10
Added	2008-12-11 08:11
Author	DAH

[Data]

Number	379	Instrument: Laser Ceilometer. There is a gap in the recorded data for no apparent reason. Although all instruments were powered down during the middle of the day on 2008-12-10, the ceilometer resumed normal operations when the power was restored. It wasn't until 6 hours later that the generation/acquisition of data ceased. The problem was resolved as mysteriously as it had begun, i.e. without any intervention.
Start	2008-12-10 20:10
End	2008-12-11 12:10
Added	2008-12-12 10:13
Author	DAH

[Data]

Number	378	Instrument: MST Radar. The radar suffered from contamination of the Doppler spectra at the lowest range gates. Although the vertical velocities were affected by this, the automatic quality control prevented the horizontal wind data from being contaminated. ZAKO was on site towards the end of the event but was unable to identify the source of the problem, which disappeared by itself.
Start	2008-12-11 01:30
End	2008-12-11 11:30
Added	2008-12-12 10:07
Author	DAH

[Data]

Number	380	Instrument: MST Radar. The radar suffered from a short period of interference. This does not appear to have caused any contamination of the wind-profile data.
Start	2008-12-12 11:15
End	2008-12-12 13:00
Added	2008-12-18 08:19
Author	DAH

[Data]

Number	381	Instrument: MST Radar. The radar suffered from a short period of interference. This does not appear to have caused any contamination of the wind-profile data.
Start	2008-12-13 19:55
End	2008-12-13 21:15
Added	2008-12-18 08:20
Author	DAH

[Data]

Number	382	Instrument: MST Radar. The radar suffered from contamination of the Doppler spectra at the lowest range gates. However, this does not appear to have caused any contamination of the wind-profile data.
Start	2008-12-15 01:40
End	2008-12-15 09:00
Added	2008-12-18 08:23
Author	DAH

[Data]

Number	383	Instrument: MST Radar. The radar suffered from a short period of interference. This does not appear to have caused any contamination of the wind-profile data.
Start	2008-12-16 05:50
End	2008-12-16 07:20
Added	2008-12-18 08:25
Author	DAH

[Data]

Number	384	Instrument: MST Radar. The radar suffered from a short period of interference. This does not appear to have caused any contamination of the wind-profile data.
Start	2008-12-17 06:15
End	2008-12-17 07:00
Added	2008-12-18 08:25
Author	DAH

[Data]

Number	385	Instrument: MST Radar. The radar suffered from a short period of interference. This does not appear to have caused any contamination of the wind-profile data.
Start	2008-12-17 11:00
End	2008-12-17 13:30
Added	2008-12-18 08:26
Author	DAH

[Data]

Number	386	Instrument: MST Radar. The radar suffered from a period of interference. This does not appear to have caused any contamination of the wind-profile data.
Start	2008-12-19 07:20
End	2008-12-19 10:20
Added	2008-12-22 08:20
Author	DAH

[Data]

Number	388	Instrument: MST Radar. The radar suffered from a period of interference although this appears to have caused only a mild contamination of the wind-profile data for a short period around 03:40 UT. This is only visible at the higher range gates.
Start	2008-12-26 00:00
End	2008-12-26 04:30
Added	2009-01-06 09:00
Author	DAH

[Data]

Number	389	Instrument: MST Radar. The radar suffered from instabilities at the lowest range gates, although the number of range gates affeceted varies during the period. This does not appear to have caused contamination of the wind-profile data.
Start	2008-12-26 18:50
End	2008-12-27 11:00
Added	2009-01-06 09:04
Author	DAH

[Data]

Number	390
Start	2008-12-29 00:00
End	2009-01-01 14:46
Added	2009-01-06 14:47
Author	DAH

[Data]

Number	391	Instrument: MST Radar. The radar suffered from a long period of the spectra at the lowest range gates being contaminated. This does not appear to have contaminated the horizontal components of the wind-profile data, but the vertical velocity components are cleary contaminated at the lowest few range gates.
Start	2008-12-29 00:00
End	2009-01-01 08:40
Added	2009-01-06 14:50
Author	DAH

[Data]

Number	387	Instrument: MST Radar. A hard-drive overflow on the signal processing machine caused an interruption in the data flow. DAH freed up some disk space, which allowed the backlog of observations to be processed as normal.
Start	2008-12-30 19:40
End	2008-12-31 12:40
Added	2008-12-31 12:54
Author	DAH

[Data]

Number	392	Instrument: MST Radar. The radar appears to have suffered from a short period of interference although this does not appear to have contaminated the wind-profile data.
Start	2009-01-01 09:30
End	2009-01-01 10:00
Added	2009-01-06 14:51
Author	DAH

[Data]

Number	393	Instrument: MST Radar. The radar suffered from a prolonged period of the spectra at the lowest range gates showing signs of instability. This caused some limited contamination of the horizontal components of the wind-profile data, but the problems were primarily confined to the vertical velocities at the very lowest range gates.
Start	2009-01-01 19:00
End	2009-01-04 14:30
Added	2009-01-06 15:09
Author	DAH

[Data]

Number	394	Instrument: MST Radar. The radar suffered from another prolonged period of contamination of the Doppler spectra at the lowest range gates. This has caused some contamination of the vertical velocities but not of the horizontal wind components - which have data gaps instead. The cessation of the problem appears to have coincided with DPW switching off the ventilation fans in the transmitter room. It has possible that the problem is realted to the markedly cold temperatures.
Start	2009-01-04 21:00
End	2009-01-06 12:00
Added	2009-01-07 08:24
Author	DAH

[Data]

Number	395	Instrument: MST Radar. The radar suffered from a period of interference, although this does not appear to have contaminated the wind-profile data.
Start	2009-01-07 02:00
End	2009-01-07 04:20
Added	2009-01-08 08:14
Author	DAH

[Data]

Number	396	Instrument: MST Radar. DAH changed the date-time stamp in the file names and in the headers of 30-minute-averaged wind-profile messages (which are used by the Office) to indicate the end of the averaging period. This stamp had previously indicated the beginning of the averaging period.
Start	2009-01-15 11:45
End	2009-01-15 11:45
Added	2009-01-16 14:29
Author	DAH

[Data]

Number	398	Instrument: MST Radar. ZAKO replaced the choke on TX5. It is not known when this component failed, although it does not appear to have a major impact on the radar's performance. ZAKO also adjusted board 7 on the beam steering unit. It had not been inserted securely which had caused some of the relay units for some of the beam pointing directions to have suffered some problems. Again this does not appear to have a significant impact on the radar's performance.
Start	2009-01-16 09:30
End	2009-01-16 09:30
Added	2009-01-19 08:14
Author	DAH

[Data]

Number	397	Instrument: MST Radar. DAH optimised the timing of processes on both the MST radar data acquisition and signal processing PCs in order to minimise the delay before a 30-minute-averaged wind-profile message (which is used by the Met Office) is produced. Previously such messages were available 25 minutes after the end of an averaging period. Now they are available only 16 minutes after the end of an averaging period.
Start	2009-01-16 10:19
End	2009-01-16 10:19
Added	2009-01-16 14:33
Author	DAH

[Data]

Number	399	Instrument: MST Radar. The radar suffered from a period of interference. This does not appear to have contaminated the wind-profile data but to have left a gap of missing data.
Start	2009-01-18 02:00
End	2009-01-18 03:40
Added	2009-01-19 08:16
Author	DAH

[Data]

Number	400	Instrument: MST Radar. The radar suffered from a period of interference. This does not appear to have contaminated the wind-profile data but to have left a gap of missing data.
Start	2009-01-18 18:15
End	2009-01-18 21:10
Added	2009-01-19 08:16
Author	DAH

[Data]

Number	401	Instrument: MST Radar. The radar suffered from several periods of interference during the course of the day. This primarily led to a reduction in useful altitude coverage although the wind-profile data at the higher altitudes (> 17 km) show small signs of contamination at around 06:00, 11:30, 15:00 and 17:40 UT.
Start	2009-01-19 03:00
End	2009-01-19 18:20
Added	2009-01-20 08:08
Author	DAH

[Data]

Number	402	Instrument: MST Radar. The radar suffered from a short period of interference. This does not appear to have contaminated the wind-profile data.
Start	2009-01-20 02:00
End	2009-01-20 02:40
Added	2009-01-21 08:20
Author	DAH

[Data]

Number	403	Instrument: MST Radar. The radar suffered from a short period of interference. This does not appear to have contaminated the wind-profile data.
Start	2009-01-20 18:00
End	2009-01-20 19:20
Added	2009-01-21 08:21
Author	DAH

[Data]

Number	404	Instrument: MST Radar. The radar appears to have suffered from a short a mild period of interference. This did not cause any contamination of the wind-profile data.
Start	2009-01-21 17:45
End	2009-01-21 18:15
Added	2009-01-22 08:44
Author	DAH

[Data]

Number	405	Instrument: MST Radar. The radar suffered from a period of interference. However, this does not appear to have caused any contamination of the wind-profile data.
Start	2009-01-23 00:00
End	2009-01-23 03:40
Added	2009-01-26 08:09
Author	DAH

[Data]

Number	406	Instrument: MST Radar. The radar suffered from a period of interference. However, this caused only brief contamination of the wind-profile data at around 07:50 and then again at around 08:30 UT.
Start	2009-01-23 07:00
End	2009-01-23 12:00
Added	2009-01-26 08:10
Author	ZKO

[Data]

Number	407	Instrument: MST Radar. The radar suffered from a period of interference. However, this does not appear to have caused any contamination of the wind-profile data.
Start	2009-01-23 20:40
End	2009-01-23 21:10
Added	2009-01-26 08:11
Author	ZKO

[Data]

Number	408	Instrument: MST Radar. The radar suffered from a period of interference. However, this does not appear to have caused any contamination of the wind-profile data.
Start	2009-01-24 13:30
End	2009-01-24 14:30
Added	2009-01-26 08:13
Author	DAH

[Data]

Number	409	Instrument: MST Radar. The radar suffered from a period of interference. However, this does not appear to have caused any contamination of the wind-profile data.
Start	2009-01-24 21:00
End	2009-01-24 23:00
Added	2009-01-26 08:13
Author	DAH

[Data]

Number	410	Instrument: MST Radar. The radar suffered from a period of interference. However, this does not appear to have caused any contamination of the wind-profile data.
Start	2009-01-25 00:00
End	2009-01-25 01:00
Added	2009-01-26 08:14
Author	DAH

[Data]

Number	411	Instrument: MST Radar. The radar suffered from a period of interference. However, this does not appear to have caused any contamination of the wind-profile data.
Start	2009-01-25 09:00
End	2009-01-25 10:30
Added	2009-01-26 08:15
Author	DAH

[Data]

Number	412	Instrument: MST Radar. The radar suffered from a period of interference. However, this does not appear to have caused any contamination of the wind-profile data.
Start	2009-01-26 07:40
End	2009-01-26 08:50
Added	2009-01-27 08:21
Author	DAH

[Data]

Number	413	Instrument: MST Radar. The radar suffered from a period of interference. However, this does not appear to have caused any contamination of the wind-profile data.
Start	2009-01-26 19:00
End	2009-01-26 19:40
Added	2009-01-27 08:22
Author	DAH

[Data]

Number	414	Instrument: MST Radar. The radar suffered from a period of interference. This does not appear to have contaminated the wind-profile data.
Start	2009-01-27 06:00
End	2009-01-27 08:30
Added	2009-01-28 08:07
Author	DAH

[Data]

Number	415	Instrument: MST Radar. The radar sufered from a very short period of interference. This does not appear to have contaminated the wind-profile data.
Start	2009-01-28 20:30
End	2009-01-28 20:45
Added	2009-01-30 08:07
Author	DAH

[Data]

Number	416	Instrument: MST Radar. The radar suffered from a short period of interference although this does not appear to have contaminated the wind-profile data.
Start	2009-01-29 05:00
End	2009-01-29 06:20
Added	2009-01-30 08:09
Author	DAH

[Data]

Number	417	Instrument: MST Radar. The radar suffered from a period of interference. This caused contamination of the wind-profile data 04:30 - 05:10 UT.
Start	2009-01-31 03:20
End	2009-01-31 06:00
Added	2009-02-02 08:13
Author	DAH

[Data]

Number	418	Instrument: MST Radar. The radar suffered from a period of interference. This did not cause any contamination of the wind-profile data.
Start	2009-01-31 10:30
End	2009-01-31 11:20
Added	2009-02-02 08:14
Author	DAH

[Data]

Number	419	Instrument: MST Radar. The radar suffered from a period of interference. This does not appear to have caused any contamination of the wind-profile data.
Start	2009-01-31 19:30
End	2009-01-31 20:50
Added	2009-02-02 08:16
Author	DAH

[Data]

Number	420	Instrument: MST Radar. The radar suffered from a period of "comb" interference at the lowest range gates, which is expected to have been caused by very low temperatures in the TX room. This primarily lead to a gap in reliable wind-profile data at the lowest altitudes, although there is some slight contamination of the vertical velocities.
Start	2009-01-31 21:00
End	2009-02-01 00:30
Added	2009-02-02 08:21
Author	DAH

[Data]

Number	421	Instrument: MST Radar. The radar experienced another instance of "comb" interference at the lowest range gates. Although this primarily lead to a loss of reliable wind-profile data, there is some evidence of contamination of the vertical velocities.
Start	2009-02-01 03:00
End	2009-02-01 11:00
Added	2009-02-02 08:27
Author	DAH

[Data]

Number	422	Instrument: MST Radar. The radar suffered from another episode of "comb" interference at the lowest range gates. This lead to contamination of the vertical velocities but not to the horizontal wind components. The problem disappeared after ZAKO switched off the extractor fans in the TX room.
Start	2009-02-01 21:00
End	2009-02-02 09:30
Added	2009-02-02 11:25
Author	DAH

[Data]

Number	423	Instrument: MST Radar. The radar was powered down so that some maintenance work could be undertaken.
Start	2009-02-04 09:50
End	2009-02-04 13:14
Added	2009-02-04 16:04
Author	DAH

[Data]

Number	424	Instrument: MST Radar. The radar suffered from a prolonged period of (apparently) intermittent interference. This appears to have caused only a minor level of contamination of the wind-profile data at around 04:20 UT on 2009-02-21.
Start	2009-02-20 19:30
End	2009-02-21 06:20
Added	2009-03-02 10:30
Author	DAH

[Data]

Number	425	Instrument: MST Radar. The radar suffered from a short period of intereference which did not cause any contamination of the wind-profile data.
Start	2009-02-21 12:30
End	2009-02-21 12:50
Added	2009-03-02 10:33
Author	DAH

[Data]

Number	426	Instrument: MST Radar. The radar suffered from a short period of intereference which did not cause any contamination of the wind-profile data.
Start	2009-02-21 18:00
End	2009-02-21 20:00
Added	2009-03-02 10:33
Author	DAH

[Data]

Number	427	Instrument: MST Radar. The radar suffered from a period of interference. Mild contamination of the wind-profile data was confined to the period 21:30 - 23:30 UT on 2009-02-22.
Start	2009-02-22 20:00
End	2009-02-23 02:00
Added	2009-03-02 10:37
Author	DAH

[Data]

Number	428	Instrument: MST Radar. The radar suffered from a period of interference. Contamination of the wind-profile and vertical velocity data was confined to the period 02:00 - 03:00 UT.
Start	2009-02-24 00:30
End	2009-02-24 04:30
Added	2009-03-02 10:41
Author	DAH

[Data]

Number	429	Instrument: MST radar. The radar suffered from a short period of interference. This does not appear to have caused any contamination of the wind-profile data.
Start	2009-02-24 23:30
End	2009-02-25 01:00
Added	2009-03-02 10:46
Author	DAH

[Data]

Number	430	Instrument: MST Radar. The radar suffered from three short instances of interference - around 12:50 UT, 13:40 UT and 16:30 UT. None caused any contamination of the wind-profile data.
Start	2009-02-26 12:00
End	2009-02-26 17:00
Added	2009-03-02 10:49
Author	DAH

[Data]

Number	431	Instrument: MST Radar. One of the four 28 V Power Supply units in the relay driver shorted after a relay cable fault to Box number 60. It appears that the associated relay cable had been cut through by an animal but that this fault did not become apparent until the cable was moved to allow building contractors to carry out work on the site. ZAKO was on site (a Saturday) and so was able to repair the damage. The wind-profile data are unreliable for the whole of the affected period.
Start	2009-02-28 08:30
End	2009-02-28 09:50
Added	2009-03-02 11:02
Author	DAH

[Data]

Number	432	Instrument: MST Radar. The radar suffered from a short period of interference. This did not cause any contamination of the wind-profile data.
Start	2009-02-28 20:30
End	2009-02-28 22:00
Added	2009-03-02 11:06
Author	DAH

[Data]

Number	433	Instrument: MST Radar. The radar suffered from a period of mild interference. This did not cause any contamination of the wind-profile data.
Start	2009-03-01 13:00
End	2009-03-01 14:00
Added	2009-03-02 11:54
Author	DAH

[Data]

Number	434	Instrument: MST Radar. The radar suffered sporadically from interference during this period. Although this does not appear to have caused any contamination of the wind-profile data, it did lead to a significant reduction in useful altitude coverage between 2009-03-06 23:45 and 2009-03-07 00:45 UT.
Start	2009-03-06 19:00
End	2009-03-07 01:00
Added	2009-03-12 08:24
Author	DAH

[Data]

Number	435	Instrument: MST Radar. The radar suffered from a short period of interference. This does not appear to have caused any contamination of the wind-profile data but it did lead to a significant reduction in useful altitude coverage.
Start	2009-03-08 01:30
End	2009-03-08 02:15
Added	2009-03-12 08:27
Author	DAH

[Data]

Number	436	Instrument: MST Radar. The radar suffered from a short period of interference. This does not appear to have caused any contamination of thw wind-profile data.
Start	2009-03-10 00:00
End	2009-03-10 01:00
Added	2009-03-12 09:43
Author	DAH

[Data]

Number	437	Instrument: MST Radar. The radar suffered from a period of interference. This does not appear to have caused any contamination of thw wind-profile data, although it did cauise the useful altitude range to be reduced.
Start	2009-03-10 05:00
End	2009-03-10 08:30
Added	2009-03-12 09:45
Author	DAH

[Data]

Number	438	Instrument: MST Radar. The radar suffered from a period of interference. This does not appear to have caused any contamination of thw wind-profile data, although it did cause the useful altitude range to be significantly reduced.
Start	2009-03-10 11:40
End	2009-03-10 13:20
Added	2009-03-12 09:48
Author	DAH

[Data]

Number	439	Instrument: MST Radar. The radar suffered from a short period of interference, This does not appear to have contaminated the wind-profile data.
Start	2009-03-14 03:30
End	2009-03-14 04:40
Added	2009-03-17 08:27
Author	DAH

[Data]

Number	440	Instrument: MST Radar. The radar suffered from a short period of interference, This does not appear to have contaminated the wind-profile data.
Start	2009-03-14 11:30
End	2009-03-14 12:30
Added	2009-03-17 08:34
Author	DAH

[Data]

Number	441	Instrument: MST Radar. The radar suffered from a short period of interference, This does not appear to have contaminated the wind-profile data.
Start	2009-03-14 23:00
End	2009-03-14 23:59
Added	2009-03-17 08:35
Author	DAH

[Data]

Number	442	Instrument: MST Radar. The radar suffered from a short period of interference, This does not appear to have contaminated the wind-profile data.
Start	2009-03-15 10:30
End	2009-03-15 11:00
Added	2009-03-17 08:44
Author	DAH

[Data]

Number	443	Instrument: MST Radar. The radar suffered from a short period of interference, This does not appear to have contaminated the wind-profile data.
Start	2009-03-15 23:00
End	2009-03-15 23:30
Added	2009-03-17 08:44
Author	DAH

[Data]

Number	444	Instrument: MST Radar. The radar suffered from a short period of interference. This does not appear to have contaminated the wind-profile data.
Start	2009-03-21 22:00
End	2009-03-21 22:40
Added	2009-03-27 09:28
Author	DAH

[Data]

Number	452	Instrument: MST Radar. The radar was operated in a special campaign mode for which ST observations were made at both 150 and 300 m range resolution. This had a number of effects. The total cycle time was increased from just under 5 minutes to just under 10 minutes. Moreover, only 1 vertical beam observation was made per cycle at 300 m resolution. Typically these are made every other dwell and horizontal wind-components are derived using the vertical dwell which is closest in time to the corresponding off-vertical dwell. In the campaign mode, the separation between dwells could be up to 2 minutes (as opposed to just 24 s). The observation format has returned to that used prior to the campaign except that a Hanning data weightinmg window is not used instead of a Rectangular in deriving the Doppler spectra.
Start	2009-03-23 09:55
End	2009-05-05 07:30
Added	2009-05-05 13:33
Author	DAH

[Data]

Number	445	Instrument: MST Radar. The radar suffered from two short instances of interference during this period. Neither appears to have contaminated the wind-profile data.
Start	2009-03-24 02:00
End	2009-03-24 05:00
Added	2009-03-27 12:27
Author	DAH

[Data]

Number	446	Instrument: MST Radar. The radar suffered from a short period of interference. This does not appear to have contaminated the wind-profile data.
Start	2009-03-28 06:45
End	2009-03-28 08:00
Added	2009-03-30 08:17
Author	DAH

[Data]

Number	447	Instrument: MST Radar. The radar suffered from a short period of interference. This does not appear to have contaminated the wind-profile data.
Start	2009-03-28 21:00
End	2009-03-28 22:00
Added	2009-03-30 08:17
Author	DAH

[Data]

Number	448	Instrument: MST Radar. The radar suffered from a short period of interference. This did not contaminate the wind-profile data.
Start	2009-04-02 03:00
End	2009-04-02 03:50
Added	2009-04-03 08:05
Author	DAH

[Data]

Number	449	Instrument: MST Radar. The radar suffered from a short period of interference. This did not contaminate the wind-profile data.
Start	2009-04-03 03:50
End	2009-04-03 04:45
Added	2009-04-06 08:13
Author	DAH

[Data]

Number	450	Instrument: MST Radar. The radar suffered from a short period of interference. This did not contaminate the wind-profile data.
Start	2009-04-05 02:30
End	2009-04-05 03:20
Added	2009-04-06 08:17
Author	DAH

[Data]

Number	451	Instrument: MST Radar, Laser Ceilometer, WXT510, Sky-camera. There was a power failure in the Capel Dewi area. According to Manweb, this was caused by a broken insulator on an overhead cable. DPW, who came to the site during the afternoon, warned DAH that the power was down. However, the UPS units had already become discharged and so it was too late to shut down equipment in a controlled manner. Neverthless, everything came back up cleanly (except PC Gaius, which DPW restarted manually) when the power was resumed at around 14:20 UT. PC Augustus always takes a long time to restart after a reboot (owing to the disk check) and so DAH retstarted the MST Radar and the WXT510 acquisition programs from home later in the evening.
Start	2009-04-27 13:00
End	2009-04-27 16:45
Added	2009-04-28 09:06
Author	DAH

[Data]

Number	453	Instrument: MST Radar. The radar was powered down to allow LED to install a new blower motor on TX1.
Start	2009-05-07 14:10
End	2009-05-07 15:47
Added	2009-05-08 08:11
Author	DAH

[Data]

Number	454	Instrument: Campbell Scientific surface met sensors. There has been an intermittent problem with the comms link to the data logger which has prevented the data from being downloaded. LED encased the comms unit within a waterproof box (comms problems are thought to be typically associated with a build up of moisture within the data logging box), which allowed it to function for a short while. However, the problem was finally cured by LED tapping the comms unit with the back-end of a screwdriver. A poor connection appears to have been the limiting factor. In connection with this problem, no data were recorded between 2009/05/15 15:10 and 2009/06/08 07:30 UT. This situation was resolved when DAH reloaded the acquisition program to the logger. It turns out that the unit had been power cycled, in an attempt to diagnose the initial problem, and this had caused the logger to lose its program.
Start	2009-05-12 00:00
End	2009-06-08 07:30
Added	2009-06-02 09:12
Author	DAH

[Data]

Number	463	Instrument: MST Radar. LED replaced the driver choke on TX3. It is not clear when it failed, though the useful altitude coverage of the radar had been somewhat reduced since at least early May 2009.
Start	2009-05-22 12:00
End	2009-05-22 12:00
Added	2009-06-23 16:27
Author	DAH

[Data]

Number	464	Instrument: MST Radar. LED replaced the EHT fuse on TX3.
Start	2009-05-26 12:00
End	2009-05-26 12:00
Added	2009-06-23 16:29
Author	DAH

[Data]

Number	455	Instrument: Campbell Scientific surface met sensors. DAH updated the clock on the data logger which had been running 11 s slow.
Start	2009-06-08 07:18
End	2009-06-08 07:18
Added	2009-06-08 10:13
Author	DAH

[Data]

Number	456	Instrument: MST Radar. The radar suffered from a period of interference. This caused a mild level of contamination of the horizontal wind data above 14 km and at around 16 UT.
Start	2009-06-08 15:00
End	2009-06-08 18:30
Added	2009-06-09 08:06
Author	DAH

[Data]

Number	457	Instrument: MST Radar. The radar suffered from a short period of interference. This caused only a very small amount of contamination of the horizontal winds.
Start	2009-06-09 12:30
End	2009-06-09 13:30
Added	2009-06-10 12:08
Author	DAH

[Data]

Number	458	Instrument: MST Radar. The radar suffered from a short period of interference. This caused only a very minor contamination of the wind-profile data.
Start	2009-06-11 17:30
End	2009-06-11 18:00
Added	2009-06-12 08:10
Author	DAH

[Data]

Number	459	Instrument: MST Radar. The radar suffered from a problem - apparently a reduction in transmit power - which led to an unusual form of loss of altitude coverage: vertical velocities are only available around the tropopause altitude and horizontal velocities are flagged as being unrelaible at most altitudes.
Start	2009-06-12 08:50
End	2009-06-12 12:00
Added	2009-06-22 08:16
Author	DAH

[Data]

Number	460	Instrument: MST Radar. The radar suffered from a period of interference. This led to a contamination of the vertical velocities at altitudes of above approximately 17 km and of the horizontal velocities at altitudes of above approximately 12 km.
Start	2009-06-12 18:00
End	2009-06-12 20:30
Added	2009-06-22 08:20
Author	DAH

[Data]

Number	461	Instrument: MST Radar. The radar operated in an unstable manner which led to the horizontal velocities and, to a lesser extent, the vertical velocities being flagged as unreliable for most of the period.
Start	2009-06-19 09:50
End	2009-06-20 09:00
Added	2009-06-22 08:28
Author	DAH

[Data]

Number	462	Instrument: MST Radar. The radar suffered from a period of interference, which led to contamination of the vertical velocities and, to a lesser extent, of the horizontal velocities at altitudes of above approximately 15 km.
Start	2009-06-21 08:28
End	2009-06-21 11:10
Added	2009-06-22 08:33
Author	DAH

[Data]

Number	465	Instrument: MST Radar. TX6 was powered down to allow LED to fix a new blower motor to it.
Start	2009-06-26 10:20
End	2009-06-26 12:50
Added	2009-06-26 16:16
Author	DAH

[Data]

Number	467	Instrument: Campbell Scientific tipping bucket rain gauge. LED cleaned out the rain collecting bowl on 2009-07-14. However, he didn't check the inside of the instrument and on 2009-07-21, when it was raining, he noticed that the water was not draining through properly. He cleaned out the nozzle, which had become blocked. There is evidence of unreliable rain data on 2009-07-18 and 2009-07-19.
Start	2009-07-14 12:00
End	2009-07-21 12:00
Added	2009-07-22 08:22
Author	DAH

[Data]

Number	466	Instrument: MST Radar. The radar appears to have suffered from interference, although this does not appear to have contaminated any of the data products.
Start	2009-07-17 09:00
End	2009-07-17 11:00
Added	2009-07-20 08:10
Author	DAH

[Data]

Number	468	Instrument: MST Radar. The radar was powered down to allow LED to change the blower motor on TX4, which was acting as the locking transmitter.
Start	2009-07-24 08:30
End	2009-07-24 11:32
Added	2009-07-24 13:59
Author	DAH

[Data]

Number	469	Instrument: Vaisala WXT510. DAH took advantage of the MST radar being powered down to reboot Augustus, which also logs data from the WXT510. Owing to the lengthy disk check performed on restart, the data acquisition could not be started for 2 hours. This is normal.
Start	2009-07-24 09:22
End	2009-07-24 11:13
Added	2009-07-24 14:03
Author	DAH

[Data]

Number	470	Instrument: MST Radar. LED powered down TX1 to allow him to change the extractor fan on it. This gave rise to a slight reduction in radar return signal power for the duration.
Start	2009-07-28 14:00
End	2009-07-28 14:45
Added	2009-07-29 08:13
Author	DAH

[Data]

Number	473	Instrument: MST Radar. LED reported that one of the new transmitter extractor fans failed over the weekend. Although these are nominally slightly more powerful than the ones they replaced, two have failed within their first couple of months of operation. LED suspects that strong winds blowing back along the extractor pipes may be responsible. He is experimenting with simply venting the extracted air into the transmitter room and not along the pipes. This does not appear to cause any undesirable increase in transmitter temperature.
Start	2009-08-28 12:00
End	2009-09-02 09:01
Added	2009-09-07 09:24
Author	DAH

[Data]

Number	471	Instrument: MST Radar. The radar appears to have suffered from a short period of interference. This does not appear to have contaminated any of the data products.
Start	2009-08-30 08:00
End	2009-08-30 09:00
Added	2009-09-02 08:48
Author	DAH

[Data]

Number	474	Instrument: Frongoch Wind Sensors. Over 100 hours of data were lost following the failure of the dial-up modem at Capel Dewi (which is needed to connnect to the data logger at Frongoch). This is thought to have been caused by a close lightning strike on the afternoon of 2009-09-01. A replacement modem was installed on the morning of 2009-09-08.
Start	2009-09-01 10:00
End	2009-09-05 19:34
Added	2009-09-09 08:45
Author	DAH

[Data]

Number	472	Instrument: All. There was a lightning strike very close to the MST Radar site at some time between 14:00 and 15:00 on 2009-09-01. Deep convection can be seen by the MST radar during this time. There was apparently a brief loss of the mains electricity, although all equipment was kept running by the UPS units. However, it has not since been possible to establish contact with the Frongoch surface wind data logger. It is assumed that one of the dial-up modems has blown, although it is not yet clear whether it was the one at the Capel Dewi or at the Frongoch end. New modems have been ordered.
Start	2009-09-01 14:00
End	2009-09-01 15:00
Added	2009-09-07 09:17
Author	DAH

[Data]

Number	475	Instrument: Frongoch Surface Wind Sensors. The wind vane and anemometer were damaged when the 10 m support tower was being winched down. Communications between the data logger and the instruments were lost. The equipment (including the data logger) was sent back to Campbell Scientific for repairs and recalibration. The data for the first hour of operations after the equipment was re-installed, i.e. 2009-11-09 15:00 - 16:00 UT, should be ignored as repeated attempts were being made to correctly align the wind vane sensor. This process proved to be quite tricky and was virtually impossible to do using a compass and alignement by eye. The final attempt involved locking the wind vane in place and rotating the entire sensor until the real-time readings indicated that it was pointing towards north. A reading of 354.6 degrees was as close as could be managed. At first it was suspected that the sensor has been rotated by 180 degrees relative to its original alignment; the wind direction was not consistent with that seen at the lowest levels observed by the MST radar. However, when south-westerly winds began to dominate, it became clear that the alignment was correct.
Start	2009-09-14 13:50
End	2009-11-09 14:48
Added	2009-09-21 14:51
Author	DAH

[Data]

Number	477	Instrument: MST Radar. TX1 was powered down to allow LD to replace the driver valve in an attempt to increase the power output. However, since there was no change (from 4.2 kW) when TX1 was powered back up, it is assumed that the P. A. valve needs replacing at some point in the nearish future. The mains lead was changed whilst the power was down. The radar suffered from interference during this procedure, although this did not contaminate the wind-profile data.
Start	2009-10-02 08:30
End	2009-10-02 10:30
Added	2009-10-02 14:24
Author	DAH

[Data]

Number	479	Instrument: MST Radar. TX1 was powered down to allow LD to replace the final output valve. This did not result in the increase in output power that had been anticipated.
Start	2009-10-09 09:00
End	2009-10-09 11:15
Added	2009-10-23 08:38
Author	DAH

[Data]

Number	478	Instrument: MST Radar. A disk overflow on the incoming data area of Claudius caused a blockage in the data flow. This was removed by DAH at around 2009-10-12 07:15 UT. The backlog of data should start to flow through the system during the course of the morning.
Start	2009-10-10 16:00
End	2009-10-12 08:23
Added	2009-10-12 08:25
Author	DAH

[Data]

Number	480	Instrument: MST Radar. The radar was powered down to allow a survey to be carried out on the antenna array.
Start	2009-11-03 13:25
End	2009-11-03 16:06
Added	2009-11-03 16:29
Author	DAH

[Data]

Number	483	Instrument: (Campbell Scientific) Tipping bucket raingauge. The collector had become blocked with gunk, which was preventing the rain from feeding through and being registered. From an inspection of WXT510 rain data, it is clear that rain events were missed on 2009-11-06, and 2009-11-07. Although the tipping bucket raingauge registered rain on 2009-11-05, it is possible that a partial blockage was already causing the rain water to drain from the device more slowly than usual.
Start	2009-11-06 00:00
End	2009-11-10 12:00
Added	2009-11-18 10:35
Author	DAH

[Data]

Number	481	Instrument: MST Radar, Ceilometer, Sky-Camera, WXT510. The power supply to the site bungalow was down in order to allow the trip circuits to be upgraded. This led to a gap in data acquisition for all instruments except the Campbell Scientific sensors.
Start	2009-11-13 09:00
End	2009-11-13 12:30
Added	2009-11-13 13:55
Author	DAH

[Data]

Number	482	Instrument: MST Radar. The radar was powered down to allow a scheduled inspection to be carried out within the antenna array.
Start	2009-11-17 09:58
End	2009-11-17 12:47
Added	2009-11-18 10:06
Author	DAH

[Data]

Number	484	Instrument: MST Radar. The radar suffered from a prologed period of interference. This does not appear to have contaminated the wind-profile data.
Start	2009-11-22 16:00
End	2009-11-23 04:00
Added	2009-11-23 08:02
Author	DAH

[Data]

Number	485	Instrument: MST Radar. The radar suffered from 4 brief episodes of interference - at around 03:00, 06:30, 11:00 and 12:30 UT - whilst making st150 observations. None of these appears to have contaminated the wind-profile data.
Start	2009-11-26 02:30
End	2009-11-26 13:00
Added	2009-11-27 09:31
Author	DAH

[Data]

Number	486	Instrument: MST Radar. The radar suffered from a period of interference. This does not appear to have contaminated the wind-proifle data, although it did lead to a short period of missing data at around 21:00 UT.
Start	2009-12-03 20:00
End	2009-12-03 22:00
Added	2009-12-04 08:27
Author	DAH

[Data]

Number	487	Instrument: MST Radar. The radar suffered from a prolonged period of interference. Unusually this caused contamination of the wind-profile data, although only in the period 08:10 - 10:30 UT.
Start	2009-12-13 03:00
End	2009-12-13 12:00
Added	2009-12-14 17:10
Author	DAH

[Data]

Number	488	Instrument: MST Radar. The radar suffered from a period of interference. This caused contamination of the wind-profile data. DAH blocked the transmission of the data to the Met Office at around 08:15 UT and unblocked it again at 15:45 UT.
Start	2009-12-14 04:00
End	2009-12-14 10:30
Added	2009-12-14 17:12
Author	DAH

[Data]

Number	490	Instrument: MST Radar. The radar suffered from a prolonged period of interference - although this does not appear to have contaminated the wind-profile data. It seems likely that this was related to a simultaneous problem with the beam steerting unit. The interference disappeared as soon as the beam steering unit was fixed.
Start	2009-12-15 12:40
End	2009-12-17 10:40
Added	2009-12-18 08:18
Author	DAH

[Data]

Number	489	Instrument: MST Radar. The beam steering unit malfunctioned, apparently becoming stuck in a single direction, which caused the wind-profile data to be erroneous. DAH initially stopped the radar at 09:57 UT on 2009-12-16, and DPW power-cycled the RX and pre-processor unit, in an attempt to clear a simultaneous interference problem. However, both problems persisted when the radar was restarted at 10:02 UT. The radar was stopped again at around 15:15 UT so that DPW could power-cycle the beam steering unit. This was initially effective, although the beam steering unit began to malfunction again at 18:15 UT. LD was able to visit site the following morning (2009-12-17). He found that one of the beam steering circuit boards was slightly loose and normal operation was resumed once this been corrected. The data feed to the Met Office, which had been blocked at the beginning of the problem, was not resumed until almost 17:30 UT since DAH was out of the office all day.
Start	2009-12-16 07:30
End	2009-12-17 10:30
Added	2009-12-17 09:16
Author	DAH

[Data]

Number	491	Instrument: MST Radar. The radar initially suffered from unusual symptoms, which were similar to those seen 2007-05-17 - 2007-05-18. This primarily consisted of a series of interference bands, with (apparently) equal Doppler velocity spacing, affecting the lowest several range gates. A consequence of this was that vertical wind data were only available in the middle range gates and the horizontal winds were filtered out at all range gates by the quality control procedures. LD was able to visit the site on the afternoon of 2009-12-18 (a Friday), although he and DAH were unable to diagnose the cause of the problem. Consequently the radar was stopped at 15:30 UT and left idle over the weekend. LD was able to be on site again on the morning of 2009-12-21 (the Monday). He and DAH followed the procedure used when a similar problem had been seen on 2007-05-17, when a phase-lock issue was suspected. All TXs were taken out of line and then, starting with TX4, made active whilst the spectra were inspected. Three TXs were up by about 12:00 on 2009-12-21. However, it was not until 16:00, that TX6, which had blown its choke earlier in the day, was activiated and the data feed was resumed. Spectra acquired for test purposes during the earlier part of 2009-12-21 were discarded.
Start	2009-12-18 11:40
End	2009-12-21 16:00
Added	2009-12-22 08:49
Author	DAH

[Data]

Number	492	Instrument: MST Radar. The radar appears to have experienced interference sporadically during this period, although no contamination of the wind-profile data is evident.
Start	2009-12-21 18:30
End	2009-12-22 11:00
Added	2009-12-23 08:33
Author	DAH

[Data]

Number	494	Instrument: MST Radar. The radar suffered from a short period of interference, which did not cause any contamination of the wind-profile data.
Start	2009-12-23 11:30
End	2009-12-23 12:00
Added	2010-01-04 10:04
Author	DAH

[Data]

Number	495	Instrument: MST Radar. The radar suffered from intermittent interference, which did not contaminate the wind-profile data.
Start	2009-12-25 00:00
End	2009-12-25 12:30
Added	2010-01-04 10:10
Author	DAH

[Data]

Number	496	Instrument: MST Radar. The radar suffered from a period of interference, which did not contaminate the wind-profile data.
Start	2009-12-27 07:00
End	2009-12-27 14:00
Added	2010-01-04 10:14
Author	DAH

[Data]

Number	497	Instrument: MST Radar. The radar suffered from a period of interference, which did not contaminate the wind-profile data.
Start	2009-12-27 21:30
End	2009-12-28 03:00
Added	2010-01-04 10:18
Author	DAH

[Data]

Number	498	Instrument: MST Radar. The radar suffered from intermittent interference, which did not contaminate the wind-profile data.
Start	2009-12-28 11:30
End	2009-12-29 03:00
Added	2010-01-04 10:20
Author	DAH

[Data]

Number	499	Instrument: MST Radar. The radar suffered from a prolonged period of interference, which did not contaminate the wind-profile data.
Start	2009-12-29 20:30
End	2009-12-31 00:30
Added	2010-01-04 10:23
Author	DAH

[Data]

Number	500	Instrument: MST Radar. The radar suffered from a period of interference, which did not contaminate the wind-profile data.
Start	2009-12-31 03:50
End	2009-12-31 06:00
Added	2010-01-04 10:24
Author	DAH

[Data]

Number	502	Instrument: Campbell Scientific Surface Wind Sensors (Frongoch). There is an (as-yet) inexplicable gap in the data recorded by the logger.
Start	2010-01-01 22:22
End	2010-01-02 07:00
Added	2010-01-04 11:46
Author	DAH

[Data]

Number	501	Instrument: MST Radar. The radar suffered from a period of interference. This appears to have contaminated the wind-profile data for only a very short time at around 16:00 - 16:30 UT.
Start	2010-01-03 06:00
End	2010-01-03 17:10
Added	2010-01-04 10:36
Author	DAH

[Data]

Number	493	Instrument: Vaisala LD40 Laser Ceilometer. The instrument ceased to make observations. The error code changed from "00000000" to "00050004", which (according to the Vasiala handbook) suggests: "Test laser failure. Error. No more measurements possible." The problem cleared by itself just over 24 hours later. The advice given by the Vasiala helpdesk is as follows: According to the manual (M210256, revision D), the error descrpition reads for the fault 00050004 (error code 52): "Check test laser: The test laser must be regulated to a constant output signal: Utlpm = 3.25 V. If the test laser output cannot be adjusted to the correct value by the software but the value is still within valid tolerance limits, the lower luminous intensity is compensated by way of calculation. If the software cannot adjust the test laser within the valid tolerance limits, a failure message is generated." The solution to the error code, however, states: "Replace the receiver module and/or the Main Board PCB 1540 and/or the test laser. Refer to section Receiver Module Replacement on page 110." So there might be fault in the receiver or Main board instead of the test laser, or in the worst case scenario, fault at multiple modules. If you have spare parts on location, you could try changing one or another of the mentioned modules to see if the error goes away. Changing the receiver module is described in the manual. Changing the test laser is not but it's easy since the part is connected only with two screws and a coax cable. Changing the mother board should be the last choice due its complexity and lack of instructions in the manual (it's prefarbly done at our service center).
Start	2010-01-03 20:48
End	2010-01-04 21:42
Added	2010-01-04 09:56
Author	DAH

[Data]

Number	503	Instrument: MST Radar. The radar suffered from interference. This appears to have caused some minor contamination of the wind-profile data, although over limited time and altitude regions.
Start	2010-01-04 18:40
End	2010-01-05 01:40
Added	2010-01-05 08:10
Author	DAH

[Data]

Number	504	Instrument: MST Radar. The radar suffered from intermittent interference, which does not appear to have contaminated the wind-profile data.
Start	2010-01-06 19:10
End	2010-01-07 01:30
Added	2010-01-08 08:27
Author	DAH

[Data]

Number	505	Instrument: Vaisala LD40 Laser Ceilometer. The instrument has suffered from a repeat failure of the test laser, which first occured on 2010-01-03. Although the instrument started working again after the 13:23 message, the time of the next logged message suddenly jumped to 03:05 UT. All subsequent data have a time stamp which is in error by - 10 hours 19 minutes. DAH corrected this problem in software and re-created all BADC files starting from 20101-01-08 on 2010-01-29.
Start	2010-01-08 00:29
End	2010-01-08 16:00
Added	2010-01-08 08:34
Author	DAH

[Data]

Number	506	Instrument: MST Radar. The radar suffered from a short period of interference which did not contaminate the wind-profile data.
Start	2010-01-08 11:40
End	2010-01-08 13:20
Added	2010-01-11 10:14
Author	DAH

[Data]

Number	507	Instrument: MST Radar. The radar suffered from a short period of interference which did not contaminate the wind-profile data.
Start	2010-01-08 17:45
End	2010-01-08 19:00
Added	2010-01-11 10:15
Author	DAH

[Data]

Number	508	Instrument: MST Radar. The radar suffered from a short period of interference which did not contaminate the wind-profile data.
Start	2010-01-08 21:50
End	2010-01-08 23:00
Added	2010-01-11 10:16
Author	DAH

[Data]

Number	509	Instrument: MST Radar. The radar suffered from a few short periods of interference during this interval. None caused contamination of the wind-profile data.
Start	2010-01-09 00:00
End	2010-01-09 19:00
Added	2010-01-11 10:19
Author	DAH

[Data]

Number	510	Instrument: MST Radar. The radar suffered from a few short periods of interference during this interval. None caused contamination of the wind-profile data.
Start	2010-01-10 00:00
End	2010-01-10 19:00
Added	2010-01-11 10:21
Author	DAH

[Data]

Number	511	Instrument: MST Radar. LD powered down TX5 to allow him to install a new output valve. This resulted in the peak power increasing from around 5 kW to in excess of 8 kW even on the lowest power setting.
Start	2010-01-12 10:30
End	2010-01-12 12:30
Added	2010-01-14 08:40
Author	DAH

[Data]

Number	512	Instrument: MST Radar. LD removed TX6 from service in order to investigate its output power level.
Start	2010-01-15 10:00
End	2010-01-15 11:00
Added	2010-01-18 08:21
Author	DAH

[Data]

Number	513	Instrument: Vaisala WXT510. The instrument failed to record precipitation during this period, despite the fact that the Campbell Scientific sensors and the sky-camera indicate that it was raining. The last occasion on which both sensors simultaneously detected rain was on 2010-01-24. [It appears that the rain on 2010-01-27 was more like a fine mist, which fell very slowly. This would account for it not being detected by the WXT510].
Start	2010-01-27 13:30
End	2010-01-27 16:30
Added	2010-01-28 10:06
Author	DAH

[Data]

Number	514	Instrument: MST Radar. The radar suffered from a brief period of interference. This did not cause any contamination of the wind-profile data.
Start	2010-02-01 12:30
End	2010-02-01 15:00
Added	2010-02-02 08:13
Author	DAH

[Data]

Number	515	Instrument: MST Radar. LD powered down TX5 so that he could install an attachment mechanism for a new type of extractor fan.
Start	2010-02-02 10:00
End	2010-02-02 12:00
Added	2010-02-02 16:20
Author	DAH

[Data]

Number	516	Instrument: MST Radar. The radar suffered from a few brief instances of interference during this period. This did not contaminate the wind profile data.
Start	2010-02-02 17:00
End	2010-02-02 20:00
Added	2010-02-03 08:08
Author	DAH

[Data]

Number	517	Instrument: MST Radar. LD powered down TX6 so that he could change the extractor fan.
Start	2010-02-09 10:00
End	2010-02-09 12:30
Added	2010-02-10 08:05
Author	DAH

[Data]

Number	518	Instrument: MST Radar. The radar suffered from intermittent interference. This did not cause any contamination of the wind-profile data.
Start	2010-02-10 05:50
End	2010-02-10 09:10
Added	2010-02-11 08:08
Author	DAH

[Data]

Number	519	Instrument: MST Radar. The radar suffered from a period of interference. This did not cause any contamination of the wind-profile data.
Start	2010-02-11 03:50
End	2010-02-11 09:30
Added	2010-02-12 08:05
Author	DAH

[Data]

Number	520	Instrument: MST Radar. LD powered down TX5 to allow him to undertake some work on it.
Start	2010-02-12 10:30
End	2010-02-12 12:15
Added	2010-02-12 16:28
Author	DAH

[Data]

Number	523	Instrument: MST Radar. The radar suffered from a very brief period of interference. This did not contaminate the wind-profile data.
Start	2010-02-14 09:00
End	2010-02-14 09:10
Added	2010-03-15 10:29
Author	DAH

[Data]

Number	524	Instrument: MST Radar. The radar suffered from a period of interference. The wind-profile data were not contaminated.
Start	2010-02-26 14:30
End	2010-02-26 17:30
Added	2010-03-15 11:18
Author	DAH

[Data]

Number	525	Instrument: MST Radar. The radar suffered from intermittent interference. This did not cause any contamination of the wind profile data.
Start	2010-03-02 03:00
End	2010-03-02 10:00
Added	2010-03-15 11:33
Author	DAH

[Data]

Number	521	Instrument: MST radar. The radar was powered down for most of the week in order to allow a detailed survey of the system to be undertaken. During this period, it was operated 2010-03-04 17:12 - 2010-03-05 09:51.
Start	2010-03-02 09:17
End	2010-03-05 12:09
Added	2010-03-03 17:02
Author	DAH

[Data]

Number	526	Instrument: MST Radar. The radar suffered from intermittent interference. This did not cause any contamination of the wind-profile data.
Start	2010-03-05 03:30
End	2010-03-05 09:30
Added	2010-03-15 11:36
Author	DAH

[Data]

Number	527	Instrument: MST Radar. The radar suffered from intermittent interference. This did not cause any contamination of the wind-profile data.
Start	2010-03-07 05:30
End	2010-03-07 08:00
Added	2010-03-15 11:38
Author	DAH

[Data]

Number	528	Instrument: MST Radar. The radar suffered from a period of interference. This did not contaminate the wind-profile data.
Start	2010-03-08 06:30
End	2010-03-08 09:30
Added	2010-03-15 11:43
Author	DAH

[Data]

Number	522	Instrument: MST Radar. The radar suffered from a period of interference. This did not cause any contamination of the wind-profile data.
Start	2010-03-13 05:00
End	2010-03-13 08:45
Added	2010-03-15 08:17
Author	DAH

[Data]

Number	529	Instrument: MST Radar. The radar suffered from non-continuous interference during this period. The wind-profile data were not contaminated.
Start	2010-03-15 03:00
End	2010-03-15 10:50
Added	2010-03-16 08:04
Author	DAH

[Data]

Number	530	Instrument: MST Radar. The radar suffered from intermittent interference during this period. This did not cause any contamination of the wind-profile data. On 2010-03-16 LD fitted a fan to aid air circulation around the radar control and data acquisition boards. It is thought that interference may be associated with high temperatures in these units.
Start	2010-03-15 21:00
End	2010-03-16 11:15
Added	2010-03-18 09:28
Author	DAH

[Data]

Number	531	Instrument: MST Radar. The radar suffered from intermittent interference during this period. This did not cause any contamination of the wind-profile data.
Start	2010-03-20 19:40
End	2010-03-21 09:20
Added	2010-03-22 08:48
Author	DAH

[Data]

Number	533	Instrument: MST Radar. The radar suffered from intermittent interference during this period. This does not appear to have contaminated the wind-profile data.
Start	2010-03-22 21:10
End	2010-03-23 08:55
Added	2010-03-29 14:57
Author	ZKO

[Data]

Number	532	Instrument: MST Radar. LD powered down TX6 and then TX1 (one at a time) during this period to allow him to carry out maintenance work.
Start	2010-03-23 10:30
End	2010-03-23 12:30
Added	2010-03-29 14:54
Author	DAH

[Data]

Number	536	Instrument: MST Radar. LD installed a replacement battery pack on the UPS for TX5. This had been complaining for some time about one of the batteries being non-functional.
Start	2010-03-23 11:59
End	2010-03-23 12:00
Added	2010-03-29 15:04
Author	DAH

[Data]

Number	534	Instrument: MST Radar. The radar suffered from intermittent interference during this period. This does not appear to have contaminated the wind-profile data.
Start	2010-03-23 13:50
End	2010-03-24 02:20
Added	2010-03-29 14:59
Author	DAH

[Data]

Number	535	Instrument: MST Radar. LD powered up one of the TXs, which had auto-powered down at some indeterminate point during the previous 24 hours.
Start	2010-03-24 11:29
End	2010-03-24 11:30
Added	2010-03-29 15:02
Author	DAH

[Data]

Number	540	Instrument: Tipping bucket raingauge. LD cleaned out the inlet with bleach in order to remove a build-up of bio-gunge. The last recorded rain event, which was rather weak, was on 2010-03-12. It is not thought to have rained since then. A reasonable accumulation of rain was recorded on the day after cleaning, i.e. 2010-03-25.
Start	2010-03-24 16:30
End	2010-03-24 17:00
Added	2010-03-29 16:25
Author	DAH

[Data]

Number	537	Instrument: MST Radar. LD powered down TX5 in order to carry out maintenance work on it.
Start	2010-03-26 10:00
End	2010-03-26 11:00
Added	2010-03-29 15:09
Author	DAH

[Data]

Number	538	Instrument: MST Radar. The radar suffered from intermittent interference during this period.
Start	2010-03-27 20:00
End	2010-03-27 21:00
Added	2010-03-29 15:18
Author	DAH

[Data]

Number	539	Instrument: MST Radar. The quick-look plots appear to suggest that no observations were made during this period. However, spectral files are available. This is apparently a problem caused by the change from GMT to BST although it is not clear exactly where in the processing chain it occurs. There is a high degree of confidence that the time stamps of individual observations are recorded correctly (in UT) and so should not affect observations made on days to either side. It is noted that the same problem was seen when the clocks changed last year on 2009-03-29.
Start	2010-03-28 01:00
End	2010-03-28 02:00
Added	2010-03-29 15:35
Author	DAH

[Data]

Number	541	Instrument: MST Radar. The radar suffered from intermittent interference during this period. The wind-profile data do not appear to have been contaminated.
Start	2010-03-28 03:00
End	2010-03-28 10:45
Added	2010-03-30 09:07
Author	DAH

[Data]

Number	542	Instrument: MST Radar. The radar suffered from intermittent interference during this period. This does not appear to have contaminated the wind-profile data.
Start	2010-03-28 19:00
End	2010-03-29 06:00
Added	2010-03-30 09:08
Author	DAH

[Data]

Number	543	Instrument: MST Radar. The radar suffered from an isolated incidence of interference. This did not contaminate the wind-profile data.
Start	2010-03-30 12:30
End	2010-03-30 12:50
Added	2010-03-31 09:46
Author	DAH

[Data]

Number	544	Instrument: MST Radar. The radar suffered from some minor, non-continuous interference during this period. This did not contaminate the wind-profile data.
Start	2010-04-02 21:50
End	2010-04-02 23:59
Added	2010-04-06 08:44
Author	DAH

[Data]

Number	545	Instrument: Vaisala WXT510. Sporadic data messages produced by this instrument became corrupted starting at 2010-04-10 08:53 UT. DAH power-cycled the instrument at 2010-04-14 16:26 UT, although no corrupted data messages had been seen since around 13:00 of that day. At the time of updating this log entry, no corrupted messages have been seen for over 24 hours. BADC files for the affected period will need to be re-created in order to remove the obviously-incorrect measurements.
Start	2010-04-10 08:53
End	2010-04-14 16:26
Added	2010-04-12 15:31
Author	DAH

[Data]

Number	546	Instrument: Vaisala WXT510. The instrument did not record any rain during this period, although the Campbell Scientific tipping bucket rain-gauge recorded events at around 01:30, 08:50, 11:50 and 12:50 UT. It is possible that the rain was too light to be detected by the piezo-electric sensor.
Start	2010-04-25 01:00
End	2010-04-25 13:00
Added	2010-04-26 08:23
Author	DAH

[Data]

Number	547	Instrument: Vaisala WXT510. This instrument did not detect a (non-continuous) rain event during this period, although it was detected by the tipping bucket rain gauge.
Start	2010-05-01 14:10
End	2010-05-02 00:40
Added	2010-05-04 08:35
Author	DAH

[Data]

Number	548	Instrument: Vaisala WXT510. The piezo-electric sensor failed to record the very light rain which fell during this period and which was recorded by the tipping bucket rain gauge.
Start	2010-05-05 06:00
End	2010-05-05 15:50
Added	2010-05-06 08:08
Author	DAH

[Data]

Number	550	Instrument: Vaisala WXT510. This instrument failed to detect a (non-continuous) mild rain event which was recorded by the tipping bucket rain gauge.
Start	2010-05-14 00:20
End	2010-05-14 13:40
Added	2010-05-17 08:19
Author	DAH

[Data]

Number	549	Instrument: Vaisala WXT510. This instrument failed to detect a mild rain event, which was detected by the tipping bucket rain gauge.
Start	2010-05-16 00:30
End	2010-05-16 05:10
Added	2010-05-17 08:16
Author	DAH

[Data]

Number	551	Instrument: MST Radar. The radar was powered down to allow LD to carry out work on the locking transmitter.
Start	2010-05-18 09:10
End	2010-05-18 10:30
Added	2010-05-19 08:19
Author	DAH

[Data]

Number	552	Instrument: MST radar, Vasiala LD40, Vaisala WXT510, Campbell Scientific surface met sensors, Campbell Scientific surface wind sensors. A software update on the BADC computer used for generaing quick-look plots ("fair") caused the quick-look plotting facilities to stop working on 2010-05-20. The plotting tasks were transferred to another machine, although this required modifications to be made to the scripts so that they could be used with the latest version (4.4) of the gnuplot software. The modified scripts were not fully functional until 2010-05-28.
Start	2010-05-20 00:00
End	2010-05-28 16:00
Added	2010-06-03 10:02
Author	DAH

[Data]

Number	553	Instrument: MST Radar. LD took the transmitters out of operation so that he could increase their output power settings from level 2 to level 3 (out of 5). This was successful for all transmitters except the one driving the central part of the antenna array, which did not operate stably at this setting. Its output power setting was reset to level 2 before operations resumed.
Start	2010-05-25 09:00
End	2010-05-25 10:18
Added	2010-06-03 10:16
Author	DAH

[Data]

Number	554	Instrument: MST Radar. The radar suffered a short period of interference. This appears of to have mildly contaminated the wind-profile data, although for only less than 10 minutes at around 22:00 UT.
Start	2010-05-25 21:50
End	2010-05-25 23:30
Added	2010-06-03 10:20
Author	DAH

[Data]

Number	555	Instrument: MST Radar. The radar suffered from a very brief period of interference. This does not appear to have caused any contamination of the wind-profile data.
Start	2010-05-27 17:55
End	2010-05-27 18:15
Added	2010-06-03 11:25
Author	DAH

[Data]

Number	556	Instrument: MST Radar. The radar suffered from a brief period of interference. This appears to have caused some slight contamination of the wind-profile data for a small proportion of the period.
Start	2010-05-27 21:30
End	2010-05-27 22:30
Added	2010-06-03 11:31
Author	DAH

[Data]

Number	557	Instrument: MST Radar. The radar suffered from two narrowly-separated periods of interference. Neither appears to have caused any contamination of the wind-profile data.
Start	2010-05-28 10:00
End	2010-05-28 14:30
Added	2010-06-03 11:37
Author	DAH

[Data]

Number	558	Instrument: MST Radar. The radar suffered from a period of interference. This appears to have caused only very mild contamination of the wind-profile data.
Start	2010-05-31 10:30
End	2010-05-31 14:00
Added	2010-06-03 11:41
Author	DAH

[Data]

Number	559	Instrument: MST Radar. The radar suffered from a brief period of interference. This caused some contamination of the wind-profile data.
Start	2010-06-01 14:45
End	2010-06-01 15:45
Added	2010-06-03 11:45
Author	DAH

[Data]

Number	560	Instrument: MST Radar. The radar suffered from three brief periods of interference: at around 15:00, 17:10 and 19:45 UT. None of these appears to have caused contamination of the wind-profile data.
Start	2010-06-03 14:55
End	2010-06-03 20:00
Added	2010-06-04 08:41
Author	DAH

[Data]

Number	562	Instrument: MST Radar. The radar suffered from a brief period of interference. This did not cause any contamination of the wind-profile data.
Start	2010-06-05 11:50
End	2010-06-05 12:45
Added	2010-06-10 09:36
Author	DAH

[Data]

Number	561	Instrument: UPS units. The UPS units indicated a short-lived fluctuation in mains power. This does not appear to have had any further effects.
Start	2010-06-06 09:07
End	2010-06-06 09:08
Added	2010-06-06 15:33
Author	DAH

[Data]

Number	563	Instrument: MST Radar. The radar suffered from a brief period of interference. This caused some contamination of the wind-profile data.
Start	2010-06-07 09:30
End	2010-06-07 10:30
Added	2010-06-10 09:41
Author	DAH

[Data]

Number	564	Instrument: MST Radar. The radar was powered down to allow a survey of the antenna array to be conducted.
Start	2010-06-07 13:00
End	2010-06-07 16:30
Added	2010-06-10 09:43
Author	DAH

[Data]

Number	565	Instrument: MST Radar. The radar was powered down to allow a survey of the antenna array to be conducted.
Start	2010-06-08 08:30
End	2010-06-08 18:00
Added	2010-06-10 09:45
Author	DAH

[Data]

Number	568	Instrument: Vaisala WXT510. There is a gap in data capture owing to the acquisition PC, "augustus", being rebooted.
Start	2010-06-08 10:37
End	2010-06-08 12:51
Added	2010-06-11 08:24
Author	DAH

[Data]

Number	567	Instrument: Sky-Camera. There is a gap in image capture owing to the acquisition PC, "claudius", being rebooted.
Start	2010-06-08 10:40
End	2010-06-08 12:14
Added	2010-06-11 08:20
Author	DAH

[Data]

Number	566	Instrument: MST Radar. The radar was powered down to allow a survey of the antenna array to be conducted.
Start	2010-06-09 08:00
End	2010-06-09 13:00
Added	2010-06-10 09:48
Author	DAH

[Data]

Number	569	Instrument: MST Radar. LD fixed a blown choke on TX1. It is not known for how long the TX had not been transmitting.
Start	2010-06-11 10:30
End	2010-06-11 10:30
Added	2010-06-14 08:30
Author	DAH

[Data]

Number	570	Instrument: MST Radar. The radar suffered from a brief period of interference, which does not appear to have contaminated the wind-profile data.
Start	2010-06-12 20:00
End	2010-06-12 21:45
Added	2010-06-14 08:32
Author	DAH

[Data]

Number	571	Instrument: MST Radar. The radar appears to have suffered from a brief period of interference. This did not cause any contamination of the wind profile data although it did result in a data gap down to low altitudes.
Start	2010-06-21 14:45
End	2010-06-21 15:55
Added	2010-06-22 08:10
Author	DAH

[Data]

Number	572	Instrument: MST Radar. The radar suffered from a brief period of interference. This did not cause any contamination of the wind profile data.
Start	2010-06-22 19:15
End	2010-06-22 19:35
Added	2010-06-24 08:19
Author	DAH

[Data]

Number	573	Instrument: MST Radar. The radar suffered from a brief period of interference, which did not cause contamination of the wind-profile data.
Start	2010-06-24 13:00
End	2010-06-24 13:45
Added	2010-06-25 08:41
Author	DAH

[Data]

Number	574	Instrument: MST Radar. The radar suffered from a brief period of interference, which did not cause contamination of the wind-profile data.
Start	2010-06-24 18:50
End	2010-06-24 19:10
Added	2010-06-25 08:42
Author	DAH

[Data]

Number	575	Instrument: MST Radar. The radar suffered from a period of interference which did not cause any contamination of the wind-profile data.
Start	2010-06-26 16:50
End	2010-06-26 20:30
Added	2010-06-29 08:22
Author	DAH

[Data]

Number	581	Instrument: Campbell Scientific tipping bucket rain gauge. LD cleaned out the instrument, which had become blocked with gunge.
Start	2010-06-29 09:00
End	2010-06-29 09:00
Added	2010-07-08 16:24
Author	DAH

[Data]

Number	578	Instrument: Vaisala WXT510. The instrument did not record any rain during this period although some light rain was recorded (non-continuously) by the tipping bucket rain gauge. However, since the WXT510 began to record the heavy rain after 21:00, it is thought that the earlier rain was too light to register.
Start	2010-07-01 06:30
End	2010-07-01 21:00
Added	2010-07-06 08:20
Author	DAH

[Data]

Number	579	Instrument: UPS. The UPS units indicate a brief disruption in the mains electricity supply.
Start	2010-07-03 18:41
End	2010-07-03 18:42
Added	2010-07-06 08:26
Author	DAH

[Data]

Number	576	Instrument: MST Radar. The radar suffered from a brief period of interference, which did not cause any contamination of the wind profile data.
Start	2010-07-05 12:00
End	2010-07-05 12:40
Added	2010-07-06 08:14
Author	DAH

[Data]

Number	577	Instrument: MST Radar. The radar was powered down in order to allow LD to change the locking transmitter from TX3 to TX4. The latter proved to be unstable and so locking was shortly switched to TX5
Start	2010-07-06 09:30
End	2010-07-06 10:00
Added	2010-07-06 08:18
Author	DAH

[Data]

Number	580	Instrument: MST Radar. The radar appears to have suffered from a brief period of interference, This caused some contamination of the wind profile data, although for only a short section of this period.
Start	2010-07-06 17:00
End	2010-07-06 19:30
Added	2010-07-08 10:31
Author	DAH

[Data]

Number	584	Instrument: MST Radar. LD restarted TX3, which had blown a fuse. It's not known for how long the transmitter had been out of action.
Start	2010-07-07 11:00
End	2010-07-07 11:00
Added	2010-07-15 15:30
Author	DAH

[Data]

Number	582	Instrument: Vaisala WXT510. The piezo electric sensor failed to detect what looks like an itense rain event at around 20:00. The sky-camera images suggest that the rain was of the "suspended wetness" variety.
Start	2010-07-13 19:40
End	2010-07-13 20:10
Added	2010-07-14 08:10
Author	DAH

[Data]

Number	583	Instrument: Vaisala WXT510. The piezo electric sensor failed to record a number of separate rain events during the course of the day which were detected by the tipping bucket rain gauge. Although sky-camera images suggest that the rain rate was quite light for some of these events, the rain rates towards the end of the day look sufficiently heavy that they should have been detected.
Start	2010-07-14 05:50
End	2010-07-14 23:50
Added	2010-07-15 10:05
Author	DAH

[Data]

Number	585	Instrument: MST Radar. The radar suffered from a short period of interference. This did not cause any contamination of the wind-profile data.
Start	2010-07-18 17:00
End	2010-07-18 18:30
Added	2010-07-19 08:14
Author	DAH

[Data]

Number	586	Instrument WXT510. The piezo-electric sensor failed to detect any precipitation during this day, although the tipping bucket rain gauge did. Although there has been some doubt recently as to whether the sensor is capable of detecting light rain, the tipping bucket rain gauge data show 10 minute mean rates peaking at over 10 mm/hour in two events of heavy rain - 10:00 - 13:30 UT and 14:50 - 20:10. These should definitely have been detected by the WXT510. The cause of the problem is unknown.
Start	2010-07-20 00:00
End	2010-07-20 22:30
Added	2010-07-22 08:54
Author	DAH

[Data]

Number	587	Instrument: Vaisala WXT510. The piezo-electric sensor failed to the detect the intermittent rain that was seen by the tipping bucket rain gauge.
Start	2010-07-21 04:00
End	2010-07-21 20:30
Added	2010-07-22 08:57
Author	ZKO

[Data]

Number	588	Instrument: Vaisala WXT510. The instrument was power cycled (which resulted in a gap in data acquisition for 20 minutes) in an attempt to clear the problem which prevented it from detecting precipitation. This has previously helped.
Start	2010-07-27 08:30
End	2010-07-27 08:49
Added	2010-07-29 08:59
Author	DAH

[Data]

Number	589	Instrument: Electricity + MST Radar, Vaisala WXT510, Sky-Camera. The electricity supply was down for this period as part of scheduled maintenance work, by Scottish Power, on the local distribution network. All pieces of equipment were brought down in a controlled manner before 08:00 UT and then restarted after the supply was resumed. Only the Campbell Scientific data-loggers continued to operate during this period.
Start	2010-08-02 08:00
End	2010-08-02 14:00
Added	2010-08-03 08:49
Author	DAH

[Data]

Number	590	Instrument: Vaisala LD40 laser ceilometer. The instrument's internal clock, which is used to generate date-time stamps for data messages, was (passively) reset when the electricity suplly was resumed. DAH added a correction for this in soft ware by 2010-08-03 08:00 UT.
Start	2010-08-02 14:50
End	2010-08-03 08:00
Added	2010-08-03 09:05
Author	DAH

[Data]

Number	592	Instrument: MST Radar. The radar suffered from a very short period of interference. This did not cause any contamination of the wind-profile data.
Start	2010-08-03 10:05
End	2010-08-03 10:15
Added	2010-08-06 08:37
Author	DAH

[Data]

Number	591	Instrument: MST Radar. LD repaired the choke on transmitter TX1. It had first blown when the radar was restarted, following by the mains electricity becoming available on 2010-08-02. It blew once more before4 stable operations were resumed.
Start	2010-08-03 11:00
End	2010-08-03 11:00
Added	2010-08-06 08:35
Author	DAH

[Data]

Number	593	Instrument: MST Radar. The choke blew on transmitter TX5 - on a Sunday afternoon - which lead to a reduction in useful radar altitude coverage. LD repaired the choke the next time he was on site.
Start	2010-08-08 16:30
End	2010-08-10 10:10
Added	2010-08-10 13:49
Author	DAH

[Data]

Number	594	Instrument: WXT510. Although the instrument was generating rain messages during this prolonged period of moderate rain, most showed zero rain rates. Consequently the instrument recorded very little accumulation of rain.
Start	2010-08-17 00:30
End	2010-08-17 07:00
Added	2010-08-18 08:19
Author	DAH

[Data]

Number	597	Instrument: Vaisala WXT510. The instrument failed to detect significant rain accumulations in three short episodes during this period, the first of which (00:30 - 02:20 UT) had peak rain rates in excess of 5 mm/hour as measured by the tipping bucket rain gauge.
Start	2010-08-20 00:30
End	2010-08-20 09:00
Added	2010-08-23 08:28
Author	DAH

[Data]

Number	595	Instrument: UPS units. There was a brief (~ 1s) disruption of the incoming mains electricity.
Start	2010-08-20 09:40
End	2010-08-20 09:40
Added	2010-08-20 11:25
Author	DAH

[Data]

Number	596	Instrument: UPS units. All units indicated a brief (< 1 minute) disruption to the incoming mains electricity.
Start	2010-08-22 19:46
End	2010-08-22 19:46
Added	2010-08-23 08:18
Author	DAH

[Data]

Number	598	Instrument: MST Radar. The radar suffered from a brief period of interference. This did not cause any contamination of the wind profile data.
Start	2010-08-28 14:50
End	2010-08-28 15:10
Added	2010-09-01 08:22
Author	DAH

[Data]

Number	599	Instrument: MST Radar. At least one of the 6-degree beams appears to have been contaminated with ground clutter, at an altitude of around 6.5 km, although this did not affect the wind-profile data. This is of interest rather than concern as ground clutter is commonly-occurring, but is typically filtered out by the signal processing on a beam by beam basis. Evidence for the contamination is manifest in large values of the horizontal wind complementary beam variability factor and corresponding gaps in the wind-profile data.
Start	2010-09-06 12:30
End	2010-09-06 17:30
Added	2010-09-07 09:01
Author	DAH

[Data]

Number	600	Instruments: UPS units. There was a brief disruption in the incoming mains.
Start	2010-09-08 05:45
End	2010-09-08 05:45
Added	2010-09-08 08:07
Author	DAH

[Data]

Number	601	Instrument: MST Radar. The beam steering unit appears to have malfunctioned, sticking in a single off-vertical beam pointing direction. The wind-profile data for this period are consequently invalid. The problem recurred the following day, 2010-09-18.
Start	2010-09-17 23:25
End	2010-09-17 23:55
Added	2010-09-20 09:33
Author	DAH

[Data]

Number	602	Instrument: MST Radar. The beam steering unit malfunctioned again for the second time in 24 hours. It was apparently stuck in a single off-vertical direction and so the wind-profile data are invalid. The problem started on a Saturday night and so was not spotted until first thing on the following Monday morning (2010-09-20), when DAH blocked the Met Office's data feed. LD was able to be on site, in an emergency capacity, the same morning and fixed the problem. He thought that loose circuit board connections in the beam steering unit were to blame.
Start	2010-09-18 17:00
End	2010-09-20 11:15
Added	2010-09-20 09:36
Author	DAH

[Data]

Number	603	Instrument: MST Radar. LD powered down one of the transmitters (TX6) so that he could replace the blower motor with a spare unit. The original motor, which has been in operation for approximately 18 months, was beginning to make a lot of noise and will probably need to have its bearings replaced.
Start	2010-09-28 09:00
End	2010-09-28 11:00
Added	2010-09-29 08:17
Author	DAH

[Data]

Number	604	Instrument: MST Radar. The beam steering unit developed a fault which caused it to stick in an off-vertical direction. LD happened to spot this from the quick-look plot and was able to visit the site shortly afterwards. LD was able to determine, from watching the patterns on the beam steering unit display, that the problem was related to Quad 8 - probably a result of the control cable for the Phasing Unit being in a very poor condition. LD disconnected the control cable from the beam steering unit and normal operations were resumed.
Start	2010-09-30 10:50
End	2010-09-30 13:31
Added	2010-09-30 15:50
Author	DAH

[Data]

Number	605	Instrument: UPS units. All units indicated a brief dip in the incoming mains voltage. This did not cause any disruptions for the other equipment.
Start	2010-11-02 09:15
End	2010-11-02 09:15
Added	2010-11-02 11:50
Author	DAH

[Data]

Number	606	Instrument: UPS units. All units indicated a brief irregularity in the incoming mains voltage. This did not cause any disruptions for the other equipment.
Start	2010-11-02 12:29
End	2010-11-02 12:29
Added	2010-11-02 13:52
Author	DAH

[Data]

Number	607	Instrument: UPS units. All units indicated a brief irregularity in the incoming mains voltage. This did not cause any disruptions for the other equipment.
Start	2010-11-02 13:15
End	2010-11-02 13:15
Added	2010-11-02 13:53
Author	DAH

[Data]

Number	608	Instrument: Telephone/broadband connections. All communications with the site were lost for just over 24 hours. The cause of the problem is not known. All instruments appear to have continued working correctly during this period.
Start	2010-11-09 09:30
End	2010-11-10 10:30
Added	2010-11-11 08:37
Author	DAH

[Data]

Number	609	Instrument: MST Radar. The altitude coverage during this period appears to be quite low, as if the radar had lost power or transmitter lock. However, this turned out to be caused by a failure of the signal processing system to clear intermediate files for the previous day, i.e. 2010-11-09. This meant that the time-continuity quality control algorithm was comparing current data with data which was more than 24 hours old. The reason that the problem had not shown up earlier was probably that the winds did not vary significantly during the preceding hours. It is possible that this problem was an indirect result of the loss of broadband connection.
Start	2010-11-10 07:00
End	2010-11-10 19:00
Added	2010-11-11 08:43
Author	DAH

[Data]

Number	610	Instrument: MST Radar. The radar was taken out of action for 90 minutes to allow Aberystwyth University students to carry out a surveying practical on the antenna array. The choke blew on one of the transmitters (TX4) when the system was restarted but was soon fixed.
Start	2010-11-16 13:58
End	2010-11-16 15:30
Added	2010-11-16 16:00
Author	DAH

[Data]

Number	611	Instrument: MST Radar. The radar appears to have suffered from intermittent interference, which did not cause any contamination of the wind-profile data. This was probably a result of the extremely cold overnight temperatures down to -10 C.
Start	2010-11-28 07:00
End	2010-11-28 09:30
Added	2010-11-29 09:27
Author	DAH

[Data]

Number	612	Instrument: MST Radar. The radar suffered from 2 brief instances of interference - just before 09:00 UT and just after 11:00 UT - which did not cause any contamination of the wind-profile data. This was probably a result of the extremely cold overnight temperatures.
Start	2010-11-29 08:45
End	2010-11-29 11:15
Added	2010-12-06 09:00
Author	DAH

[Data]

Number	617	Instrument: Vaisala LD40 Laser Ceilometer. There is a gap in the recorded data. The cause of this remains unknown.
Start	2010-11-29 13:40
End	2010-11-29 17:00
Added	2010-12-06 11:40
Author	DAH

[Data]

Number	613	Instrument: MST Radar. The radar was powered down so that safety testing could be carried out on the electricity supply cables.
Start	2010-12-01 09:43
End	2010-12-01 11:44
Added	2010-12-06 09:22
Author	DAH

[Data]

Number	615	Instrument: Vaisala WXT510. There is a gap of 5 days in the recorded data. This was a result of the acquisition software not being manually restarted after "augustus" was rebooted following electrical cable safety tests being conducted on 2010-12-01.
Start	2010-12-01 09:52
End	2010-12-06 09:36
Added	2010-12-06 09:40
Author	DAH

[Data]

Number	619	Instrument: Sky-Camera. There is a gap of almost an hour in the recorded images for the period when the electricity supply cables were undergoing safety testing.
Start	2010-12-01 10:00
End	2010-12-01 10:58
Added	2010-12-06 11:54
Author	DAH

[Data]

Number	618	Instrument: Vaisala LD40 Laser Ceilometer. There is a gap in the recorded data. The cause of this remains unknown.
Start	2010-12-01 14:10
End	2010-12-01 15:00
Added	2010-12-06 11:41
Author	DAH

[Data]

Number	706	Instrument: MST Radar. LD restarted one of the transmitters (TX3) which had not been in operation. He changed the choke, although the problem was not caused by the existing one having blown (as was expected).
Start	2010-12-03 00:00
End	2010-12-03 12:00
Added	2012-01-23 11:36
Author	DAH

[Data]

Number	614	Instrument: MST Radar. The radar suffered from a prolonged period of interference although this did not cause any contamination of the wind-profile data. The interference was probably a result of low temperatures.
Start	2010-12-03 04:15
End	2010-12-03 08:00
Added	2010-12-06 09:28
Author	DAH

[Data]

Number	616	Instrument: MST Radar. The radar suffered from a period of interference, which did not cause any contamination of the wind-profile data.
Start	2010-12-07 03:10
End	2010-12-07 07:30
Added	2010-12-06 11:38
Author	DAH

[Data]

Number	620	Instrument: MST Radar. The radar suffered from a period of interference, which may have caused some slight contamination of the wind-profile data.
Start	2010-12-08 05:00
End	2010-12-08 09:30
Added	2010-12-09 08:48
Author	DAH

[Data]

Number	621	Instrument: MST Radar. The radar suffered from a prolonged episode of interference. Although this primarily resulted in reduced altitude coverage for useful data, some contamination of the wind-profile data is evident, particular 2010-12-09 01:00 - 02:00 UT.
Start	2010-12-08 22:00
End	2010-12-09 11:30
Added	2010-12-10 08:09
Author	DAH

[Data]

Number	622	Instrument: Vaisala LD40 laser ceilometer. The instrument failed to operate during this period, probably as a result of the very cold air temperatures. The error code ("00050004") indicates "Test laser failure. Error. No more measurements possible". This problem last occured during the very cold weather of January 2010.
Start	2010-12-20 12:30
End	2010-12-21 15:00
Added	2011-01-04 12:23
Author	DAH

[Data]

Number	623	Instrument: UPS units. All UPS indicated a brief fluctuation in input mains voltage. This did not affect the operation of any other equipment.
Start	2011-01-11 03:57
End	2011-01-11 03:57
Added	2011-01-11 08:10
Author	DAH

[Data]

Number	625	Instrument: Internet connection. The internet connection for the site appears to have been down for approximately 3 hours. This should not have lead to any problems other than delaying the delivery of files.
Start	2011-01-11 14:00
End	2011-01-11 17:00
Added	2011-01-13 08:33
Author	DAH

[Data]

Number	624	Instrument: UPS units. There appears to have been a brief fluctuation in incoming mains electricity, although only 2 UPS units (for TX2 and TX4) indicated this. No other equipment should have been affected by this.
Start	2011-01-12 15:59
End	2011-01-12 15:59
Added	2011-01-13 08:30
Author	DAH

[Data]

Number	627	Instrument: Vaisala WXT510 Met and Wind Sensors. There is a 90 minute gap in data acquisition. The cause for this is unclear.
Start	2011-01-19 11:13
End	2011-01-19 12:45
Added	2011-01-21 08:43
Author	ZKO

[Data]

Number	626	Instrument: UPS units. All units indicated a brief irregularity in incoming mains electricity. This should not have affected any of the other equipment.
Start	2011-01-19 14:16
End	2011-01-19 14:16
Added	2011-01-19 15:53
Author	DAH

[Data]

Number	628	Instrument: Vaisala WXT510 Met and Wind Sensors. There is a 45 minute gap during which data acquisition was not continuous. Within this gap data are available between 11:56 and 12:00, and between 12:07 and 12:09 UT. The cause for this is unclear.
Start	2011-01-20 11:44
End	2011-01-20 12:32
Added	2011-01-21 08:47
Author	DAH

[Data]

Number	629	Instrument: UPS units. All units indicated a brief irregularity in incoming mains electricity. This should not have affected any of the other equipment.
Start	2011-01-26 11:29
End	2011-01-26 11:29
Added	2011-01-26 11:55
Author	DAH

[Data]

Number	630	Instrument: UPS units. All units indicated a brief irregularity in incoming mains electricity. This should not have affected any of the other equipment.
Start	2011-02-05 01:24
End	2011-02-05 01:24
Added	2011-02-07 08:27
Author	DAH

[Data]

Number	631	Instrument: UPS units. All units indicated a brief irregularity in incoming mains electricity. This should not have affected any of the other equipment.
Start	2011-02-05 09:47
End	2011-02-05 09:47
Added	2011-02-07 08:27
Author	DAH

[Data]

Number	676	Instrument: MST Radar. The radar was operated using a long cycle of 24 dwells, which lasted 9 minutes and 50 seconds and encompassed 16 of the 17 available beam pointing directions (all except beam 12 - NE12.0). This was for the purpose of establishing a benchmark dataset, against which the performance of the renovated radar could be compared.
Start	2011-02-09 09:44
End	2011-02-28 11:03
Added	2011-07-04 11:19
Author	DAH

[Data]

Number	632	Instrument: MST Radar. The radar was powered down whilst voltage optimisation equipment was installed on the site's electricity supply.
Start	2011-02-15 09:22
End	2011-02-15 17:13
Added	2011-02-16 08:23
Author	DAH

[Data]

Number	638	Instrument: Vaisala WXT510 surface met and wind sensors. The instrument had to be powered down for several hours on 2011-02-15 whilst a voltage optimisation unit was installed on the radar site's power supply. However, DAH initially forgot to restart the data acquisition program and didn't spot this until first thing the following morning.
Start	2011-02-15 09:37
End	2011-02-16 08:02
Added	2011-03-18 10:32
Author	ZKO

[Data]

Number	633	Instrument: Sky-Camera. No images were recorded whilst the acquisition computer "claudius" was powered down owing to voltage optimisation equipment being installed on the site's electricity supply.
Start	2011-02-15 09:38
End	2011-02-15 12:12
Added	2011-02-16 08:50
Author	DAH

[Data]

Number	634	Instrument: UPS units. The mains electricity supply to the site bungalow was interrupted for several hours in order to allow voltage optimisation equipment to be installed. The end time corresponds to when the power was permanently restored. Power appears to have been sporadically available since around 12:00.
Start	2011-02-15 09:48
End	2011-02-15 15:17
Added	2011-02-16 11:52
Author	DAH

[Data]

Number	637	Instrument: Vaisala LD40 Ceilometer. No data were recorded whilst the acquisition computer "gaius" was powered down owing to voltage optimisation equipment being installed on the site's electricity supply.
Start	2011-02-15 09:52
End	2011-02-15 14:59
Added	2011-03-18 09:52
Author	DAH

[Data]

Number	635	Instrument: Vaisala LD40 Laser Ceilometer. The injstrument malfunctioned during this period, possibly as a result of cold night time temperatures. The error flag indicates "Test laser failure. Error. No more measurements possible". The instrument began to operate normally again without intervention.
Start	2011-03-05 04:19
End	2011-03-05 09:27
Added	2011-03-05 09:54
Author	DAH

[Data]

Number	646	Instrument: MST Radar. The radar was operated using a long cycle of 27 dwells, which took 11 minutes 40 seconds to complete and encompassed all 17 available beam pointing directions. This was for the purposes of evaluating the performance of the renovated radar.
Start	2011-03-07 15:00
End	2011-05-03 07:20
Added	2011-05-05 08:33
Author	DAH

[Data]

Number	636	Instrument: UPS units. The power within the site bunglow was briefly (i.e. for up to a few minutes) interrupted on a few occasions in order to allow a Periodic Test And Inspection survey to be carried out. Since the UPS units are able to power equipment for approximately 20 - 30 minutes in the event of a loss of supply, this had no effect on operations. The supply was interrupted at around 13:11, 13:20, 13:28, and 14:52. No more interruptions were made after 14:56.
Start	2011-03-12 13:11
End	2011-03-12 14:56
Added	2011-03-12 16:59
Author	DAH

[Data]

Number	639	Instrument: Vaisala WXT510 met and wind sensors. It's not exactly clear why this instrument stopped producing data (the problem was not spotted for almost 48 hours). However, it may have been a result of the serial port connector being slightly loose. After the connection was made firm, it was necessary to power-cycle the instrument before the flow of data was resumed.
Start	2011-03-12 14:52
End	2011-03-14 10:36
Added	2011-03-18 11:18
Author	DAH

[Data]

Number	640	Instrument: Vaisala WXT510 met and wind sensors. The initial break in data was a result of the acquisition PC, "augustus", being rebooted in connection with an MST radar problem. DAH forgot to restart the data acquisition program and did not spot the problem until first thing the following morning.
Start	2011-03-16 13:06
End	2011-03-17 08:13
Added	2011-03-18 11:22
Author	DAH

[Data]

Number	641	Instrument: MST Radar. The radar was powered down to allow voltage optimisation work to be carried out on the site's electricity supply. Although the radar was restarted at 14:43, the data were not consistently flagged as being reliable until 17:00.
Start	2011-04-07 08:05
End	2011-04-07 17:00
Added	2011-04-11 08:40
Author	DAH

[Data]

Number	644	Instrument: Vaisala LD40 Ceilometer. No data were captured whilst the power was down in the site bungalow.
Start	2011-04-07 08:05
End	2011-04-07 14:11
Added	2011-04-11 08:54
Author	DAH

[Data]

Number	645	Instrument: Vaisala WXT510 surface met and wind sensors. No data were captured whilst the power was down in the site bungalow.
Start	2011-04-07 08:16
End	2011-04-07 14:12
Added	2011-04-11 08:56
Author	DAH

[Data]

Number	643	Instrument: Sky-Camera. No images were captured whilst the electricity supply to the site bungalow was down.
Start	2011-04-07 08:20
End	2011-04-07 14:34
Added	2011-04-11 08:46
Author	DAH

[Data]

Number	642	Instrument: UPS units. The electricity supply for the whole site bungalow was powered down so that the voltage optimisation unit could be transferred from the bungalow to the wooden shed - this allowed it to optimise the voltage for both feeds to the site bungalow, not just for the TX room.
Start	2011-04-07 08:45
End	2011-04-07 14:30
Added	2011-04-11 08:44
Author	DAH

[Data]

Number	647	Instrument: Broadband Modem/Router. The internet connection to the NERC network appears to have been lost some time shortly after 2011-05-06 23:20, a Friday night. DAH did not spot this until first thing on the following Monday monring (2011-05-09). DPW power-cycled the router as soon as he arrived on site and this solved the problem. He also power-cycled the lightning-detector PC, which had been beeping irritatingly - possibly because it could not see the the outside internet. Although all of the instruments continued to operate over the weekend, the flow of MST radar data became disrupted and it appears that the time-continuity quality-control algorithm may have flagged many good data as bad as a result. The data for weekend will be reprocessed offline in order to ensure that any such problems are avoided.
Start	2011-05-06 23:20
End	2011-05-09 08:30
Added	2011-05-09 15:07
Author	DAH

[Data]

Number	648	Instrument: UPS units. The units indicate a brief disruption in the electricity supply. This did not affect any of the equipment.
Start	2011-05-13 06:56
End	2011-05-13 06:56
Added	2011-05-13 08:05
Author	DAH

[Data]

Number	649	Instrument: MST Radar. The radar appears to have suffered from interference (on at least one of the 6 degree beams), which caused some mild contamination of the wind-profile data for a short part of this time.
Start	2011-05-21 11:00
End	2011-05-21 15:00
Added	2011-05-23 08:11
Author	DAH

[Data]

Number	650	Instrument: MST Radar. The radar was running with TX1 out of operation owing to a blown choke. It is not known when the problem began, but it was spotted at around 2011-05-22 02:20 UT when a member of ATRAD, the company which installed the new beam steering components, logged on to the controller and noticed abnormally low power levels in the A sector of the antenna array.
Start	2011-05-22 02:20
End	2011-05-24 10:00
Added	2011-05-27 16:21
Author	DAH

[Data]

Number	651	Instrument: UPS units. Some, but not all, of the UPS units (i.e. those for TX1, TX2, TX3, and for the beam steering unit) complained of a brief input power problem.
Start	2011-06-01 07:03
End	2011-06-01 07:03
Added	2011-06-01 08:12
Author	DAH

[Data]

Number	653	Instrument: MST Radar. The radar experienced two short-lived episodes of interference - one at around 16:30 UT and the second at around 20:30 UT. Neither appears to have caused contamination of either the vertical or horizontal winds.
Start	2011-06-03 16:30
End	2011-06-03 20:30
Added	2011-06-06 08:33
Author	DAH

[Data]

Number	652	Instrument: MST Radar. The radar appears to have experienced 2 short-lived and minor episodes of interference - one centred at around 16:00 UT and the second at around 18:30 UT. The first one appears to have some minor contamination of the vertical velocities at altitudes of above 15 km, although the horizontal winds do not appear to have been affected.
Start	2011-06-04 15:30
End	2011-06-04 19:00
Added	2011-06-06 08:15
Author	DAH

[Data]

Number	655	Instrument: MST Radar. Owing to the problem with the broadband modem, there was a blockage of the regular data flow. This lead to the MST radar Cartesian and radial files for 2011-06-07 initially containing no data after approximately 21 UT. The complete files were generated, and deposited at the BADC, during the morning of 2011-06-09.
Start	2011-06-07 00:00
End	2011-06-07 23:59
Added	2011-06-09 12:12
Author	DAH

[Data]

Number	654	Instrument: Broadband modem. The modem appears to have lost its internet connection, which stopped data transfers taking place. Normal service was resumed after DPW rebooted the modem.
Start	2011-06-07 22:20
End	2011-06-08 14:00
Added	2011-06-09 08:37
Author	DAH

[Data]

Number	656	Instrument: MST Radar. The radar experienced a short period of interference. This did not cause any contamination of the wind profile data, although it did lead to a gap in the data.
Start	2011-06-10 13:00
End	2011-06-10 13:30
Added	2011-06-13 08:08
Author	DAH

[Data]

Number	657	Instrument: MST Radar. The radar experienced a short period of interference, which affected the data above 12 km. Although this was mostly filtered out by the quality control procedures (leading to a data gap), some contamination of the horizontal wind data is still evident in the v4 Cardinal data.
Start	2011-06-10 17:00
End	2011-06-10 18:30
Added	2011-06-13 08:10
Author	DAH

[Data]

Number	658	Instrument: MST Radar. The radar experienced two short periods of interference - one at around 17:45 UT and the second at around 19:30 UT. Neither caused any contamination of the wind-profile data or lead to any gaps in the data.
Start	2011-06-11 17:30
End	2011-06-11 19:45
Added	2011-06-13 08:18
Author	DAH

[Data]

Number	659	Instrument: MST Radar. The radar experienced a short period of interference. This did not cause any contamination of the wind profile data.
Start	2011-06-13 16:30
End	2011-06-13 17:00
Added	2011-06-14 08:03
Author	DAH

[Data]

Number	660	Instrument: MST Radar. The radar experienced a brief period of interference. This did not cause any contamination of the wind-profile data.
Start	2011-06-14 08:10
End	2011-06-14 08:45
Added	2011-06-15 08:12
Author	DAH

[Data]

Number	661	Instrument: MST Radar. The radar experienced a brief period of interference. This did not cause any contamination of the wind-profile data.
Start	2011-06-14 14:00
End	2011-06-14 14:30
Added	2011-06-15 08:12
Author	ZKO

[Data]

Number	662	Instrument: MST Radar. The radar experienced a brief period of interference. This did not cause any contamination of the wind-profile data.
Start	2011-06-14 22:30
End	2011-06-14 22:45
Added	2011-06-15 08:13
Author	DAH

[Data]

Number	667	Instrument: MST Radar. The radar experienced a short period of interference, which did not cause any contamination of the wind-profile data.
Start	2011-06-15 13:30
End	2011-06-15 14:15
Added	2011-06-23 08:42
Author	DAH

[Data]

Number	663	Instrument: Broadband Connection. The broadband connection to the site went down in the early hours of the morning. DPW tried power-cycling the modem, but this did not clear the problem. However, he discovered that he could only get a dialling tone on the (fax) line if he missed out the final section of the extension cable. As a preliminary measure, he switched over the MSTRF modem to the (phone) line normally used for the University of Manchester network. This allowed the backlog of data to be cleared before the MSTRF modem was switched back to its original position (albeit avoiding the final section of extension cable). Everything appears to be working as normal again.
Start	2011-06-16 01:00
End	2011-06-16 11:00
Added	2011-06-16 12:04
Author	DAH

[Data]

Number	664	Instrument: MST Radar. The radar experienced two short periods of interference. These do not appear to have caused any contamination of the wind-profile data.
Start	2011-06-16 18:15
End	2011-06-16 20:00
Added	2011-06-17 08:05
Author	DAH

[Data]

Number	665	Instrument: Broadband modem. The modem lost its internet connection late on 2011-06-17, a Friday evening. This stopped data transfers taking place. DPW noticed this from home, when looking at the supplementary website and came into site on the following day (a Saturday) to power cycle the modem.
Start	2011-06-17 21:20
End	2011-06-18 13:40
Added	2011-06-21 09:31
Author	DAH

[Data]

Number	666	Instrument: Broadband modem. DAH installed a new modem to replace the one which has been in operation since late March 2011 and which has gone off-line 3 times since then. The new modem is expected to be more robust.
Start	2011-06-19 17:00
End	2011-06-19 17:00
Added	2011-06-23 08:34
Author	DAH

[Data]

Number	668	Instrument: MST Radar. The radar experienced a short period of interference, which did not cause any contamination of the wind-profile data.
Start	2011-06-22 15:00
End	2011-06-22 15:30
Added	2011-06-23 08:49
Author	DAH

[Data]

Number	669	Instrument: MST Radar. The radar observation format was changed slightly so that mesospheric observations are now made using 3 beam pointing directions (NE6.0, Vert, and SE6.0) instead of just 1 (Vert). The additional dwells replace 2 st-mode Vert beam dwells and so the total cycle length remains unchanged. This format will be used for the rest of the summer season (i.e. June and July) when mesospheric echoes are expected to occur commonly.
Start	2011-06-24 08:09
End	2011-06-24 08:09
Added	2011-06-24 09:10
Author	DAH

[Data]

Number	670	Instrument: MST Radar. The radar experienced intermittent interference during this period. This does not appear to have caused any contamination of the wind-profile data.
Start	2011-06-26 15:45
End	2011-06-26 21:30
Added	2011-06-27 08:31
Author	DAH

[Data]

Number	671	Instrument: MST Radar. The radar experienced 5 brief instances of interference - at around 07:40, 14:30, 15:30, 19:15, and 20:50 UT. None of these appears to have caused any contamination of the wind-profile data.
Start	2011-06-27 07:30
End	2011-06-27 20:00
Added	2011-06-28 14:50
Author	DAH

[Data]

Number	672	Instrument: MST Radar. For some reason, communications between the radar control PC and the beam steering control PC became broken, which stopped from the beam direction changing from the Vertical. This resulted in the horizontal wind speed appearing (incorrectly) to be close to 0.0 m/s. DAH spotted this as soon as he reached the office and blocked the feed of data to the Met Office and interrupted the observation cycle shortly after 07 UT. He was able to localise the problem by examining the logs for both units. The beam steering controller PC was rebooted for good measure and LD changed phasing unit 77, which was flagged up as being faulty. However, the error message persisted with the replacement unit until LD investigated the wiring to the unit. This cleared the problem without LD having discovered any obvious problem, suggested that a sub-optimal connection was to blame. Incidentally, ATRAD happened to be monitoring the beam steering controller unit at the time and sent an alert by e-mail.
Start	2011-06-28 04:33
End	2011-06-28 09:38
Added	2011-06-28 14:53
Author	DAH

[Data]

Number	673	Instrument: MST Radar. The radar experienced interference during this period although it does not appear to have caused any contamination of the wind-profile data.
Start	2011-06-28 17:50
End	2011-06-28 19:30
Added	2011-06-29 08:29
Author	DAH

[Data]

Number	674	Instrument: MST Radar. The radar experienced interference during this period although it does not appear to have caused any contamination of the wind-profile data.
Start	2011-06-29 14:40
End	2011-06-29 15:30
Added	2011-06-30 08:09
Author	DAH

[Data]

Number	675	Instrument: MST Radar. The radar experienced a brief period of interference. This does not appear to have caused any contamination of the wind-profile data.
Start	2011-07-02 14:30
End	2011-07-02 14:50
Added	2011-07-04 08:07
Author	DAH

[Data]

Number	677	Instrument: MST Radar. The radar experienced a brief period of interference. This did not cause any contamination of the wind-profile data.
Start	2011-07-05 04:30
End	2011-07-05 05:10
Added	2011-07-07 08:28
Author	DAH

[Data]

Number	678	Instrument: MST Radar. The radar experienced a brief period of interference. This did not cause any contamination of the wind-profile data.
Start	2011-07-07 19:00
End	2011-07-07 19:30
Added	2011-07-08 08:21
Author	DAH

[Data]

Number	679	Instrument: MST Radar. The radar appears to have experienced interference on at least one of the 6 degree beams. This has caused some contamination of the wind-profile data.
Start	2011-07-08 12:00
End	2011-07-08 13:00
Added	2011-07-11 09:14
Author	DAH

[Data]

Number	680	Instrument: MST Radar. The radar experienced a brief period of interference. This did not cause any contamination of the wind-profile data.
Start	2011-07-09 11:00
End	2011-07-09 11:30
Added	2011-07-11 09:17
Author	DAH

[Data]

Number	681	Instrument: MST Radar. The radar experienced a brief period of interference. This did not cause any contamination of the wind-profile data.
Start	2011-07-09 23:20
End	2011-07-09 23:40
Added	2011-07-11 09:18
Author	DAH

[Data]

Number	682	Instrument: MST Radar. LD discovered that TX1 had blown a fuse and so had not been operating for some time - probably for most of the previous day and possibly for even longer. When LD replaced the fuse, it blew immediately. However, he could not find any obvious reason for this. TX1 was back in operation by 15:00 UT.
Start	2011-07-12 08:30
End	2011-07-12 15:00
Added	2011-07-13 08:34
Author	ZKO

[Data]

Number	683	Instrument: MST Radar. The radar was powered down in order to allow weed spraying to be carried out within the antenna array.
Start	2011-07-14 11:00
End	2011-07-14 13:00
Added	2011-07-15 08:20
Author	DAH

[Data]

Number	709	Instrument: MST Radar. One of the transmitters (TX1) blew a component whilst LD was investigating the recurrent problems which it has been experiencing. LD could not fix the transmitter until some replacement parts had been ordered.
Start	2011-07-16 15:00
End	2011-07-19 11:00
Added	2012-01-23 12:10
Author	DAH

[Data]

Number	684	Instrument: MST Radar. The radar malfunctioned owing to communication problems between the radar control PC and the beam steering control PC. Ironically, this appears to have been the result of an ATRAD engineer investigating previous instances of such problems. Unreliable wind-profile data were created for the earlier part (18:30 - 22:50 UT) of this period.
Start	2011-07-16 18:30
End	2011-07-17 00:30
Added	2011-07-18 10:09
Author	DAH

[Data]

Number	713	Instrument: MST Radar. One of the transmitters (TX1) was out of action on several occasions during this period owing to a recuurrent problem of the fuse blowing. Some of these occasions may already be logged individually. This period was marked out as a whole for an analysis of electricity consumption at the site.
Start	2011-07-17 00:00
End	2011-08-11 23:59
Added	2012-01-23 14:42
Author	DAH

[Data]

Number	685	Instrument: UPS units. The UPS units all indicated a brief disruption in the incoming mains: "On battery power in response to an input power problem".
Start	2011-08-01 12:02
End	2011-08-01 12:02
Added	2011-08-01 13:52
Author	DAH

[Data]

Number	707	Instrument: MST Radar. LD happened to be on site (a Saturday) and spotted that one of the transmitters (TX1) was down after having blown its fuse. He changed the fuse and restarted it.
Start	2011-08-06 00:00
End	2011-08-06 12:00
Added	2012-01-23 11:42
Author	DAH

[Data]

Number	710	Instrument: MST Radar. DAH discovered that the old "txtstatus" programme, which can be used to interogate the status of each of the transmitters, was unable to establish a connection to any of the units. LD found that the RS-232 interface cables had been left unconnected - possibly since the time that electrical wire testing was carried out in December 2010 but likely from the time of the rnovation work in March 2011. This program is not used operationally - hence the failure to spot the problem.
Start	2011-08-16 10:00
End	2011-08-16 11:00
Added	2012-01-23 12:23
Author	DAH

[Data]

Number	686	Instrument: Vaisala WXT510 met sensors. This instrument failed to detect 4 rain events - at around 00:30, 04:00, 09:00 and 13:45 UT - which were detected by the tipping bucket raingauge. Nevertheless, it did detect the heavt rain event at around 22:50 UT.
Start	2011-08-20 00:30
End	2011-08-22 14:30
Added	2011-08-22 08:19
Author	DAH

[Data]

Number	687	Instrument: MST Radar. LD replaced the fuse on one of the transmitters, TX1, which had been down for an unknown period of time. Based on the quick-look plots, it is possible that it went down at around 15:00 UT on the previous day. It is possible that TX1 being out of action was the cause of the persistent coincident contamination of the m-mode observations.
Start	2011-09-22 15:00
End	2011-09-23 08:30
Added	2011-09-23 11:51
Author	DAH

[Data]

Number	688	Instrument: MST Radar. One of the transmitters, TX1, was found to be down on the morning of 2011-09-26. It is not known at what time it stopped transmitting, although it had been in operation on 2011-09-25. LD fixed the blown fuse and returned it to operation on 2011-09-27.
Start	2011-09-26 00:00
End	2011-09-27 09:00
Added	2011-09-30 09:49
Author	DAH

[Data]

Number	689	Instrument: MST Radar. One of the transmitters, TX1, stopped working after it blew its fuse. Coincident contamination of the m-mode observations appears to have been related to this issue. The st-mode observations have noticeably reduced height coverage during this time.
Start	2011-09-27 13:30
End	2011-09-28 09:00
Added	2011-09-30 09:52
Author	DAH

[Data]

Number	690	Instrument: Campbell Scientific wind sensors. No data were captured for this period. The cause of the problem is not known. However, it began when there was a problem with the broadband on the phone line use for the dial-up connection to Frongoch. Consequently it might have been the result of a bad line connection.
Start	2011-10-13 06:00
End	2011-10-15 18:00
Added	2011-10-21 08:34
Author	DAH

[Data]

Number	1886	Instrument: MST Radar. The v4 wind speed within a narrow altitude band at around 9.0 km is unrealistically enhanced compared to that at adjacent times and altitudes.
Start	2011-10-15 18:20
End	2011-10-15 19:00
Added	2017-09-22 12:01
Author	DAH

[Data]

Number	691	Instrument: Campbell Scientific wind sensors. There was again a period of missing data. The cause of the problem is not known.
Start	2011-10-16 04:45
End	2011-10-16 13:00
Added	2011-10-21 08:37
Author	DAH

[Data]

Number	1887	Instrument: MST Radar. The v4 wind speed within a narrow altitude band at around 9.5 km is unrealistically enhanced compared to that at adjacent times and altitudes.
Start	2011-10-21 17:00
End	2011-10-21 17:50
Added	2017-09-22 12:05
Author	DAH

[Data]

Number	1888	Instrument: MST Radar. The v4 wind speed within a narrow altitude band at around 11.0 km is unrealistically enhanced compared to that at adjacent times and altitudes.
Start	2011-10-22 14:20
End	2011-10-22 15:10
Added	2017-09-22 12:10
Author	DAH

[Data]

Number	692	Instrument: MST Radar. One of the transmitters (TX1) blew both of its fuses. In addition to causing the radar to operate on reduced power, this also caused the noise floor to be raised. The reason for the latter is unknown although it has been seen in association with a number of similar problems with TX1 over the past couple of months. LD made an emergency visit to the site to fix TX1.
Start	2011-10-30 10:45
End	2011-10-31 09:15
Added	2011-11-01 08:19
Author	DAH

[Data]

Number	693	Instrument: MST Radar. In order to investigate the frequent problems which transmitter TX1 has been causing recently, LD isolated Quad number 3. One of the Yagis was marked with red tape, which suggested that there may have been a problem with it. LD replaced the antenna with a dummy load. However, this did not appear to make any difference.
Start	2011-11-01 11:30
End	2011-11-01 11:45
Added	2011-11-03 10:02
Author	DAH

[Data]

Number	708	Instrument: MST Radar. LD carried out a short test on transmitter TX1 to see if he could isolate the problem which has been causing it to frequently stop working in recent months. He first disconnected its RF feed, which did not affect the noise level. He then reconnected the RF feed but removed the RX feed, which reduced the noise level noticeably.
Start	2011-11-04 11:30
End	2011-11-04 11:40
Added	2012-01-23 11:49
Author	DAH

[Data]

Number	694	Instrument: MST Radar. LD took transmitter TX1 offline so that he could carry out some network measurements on antennas in quad 3. A first analysis suggests that there are problems with 2 antennas within this quad. Further work will be required. The noise floor was raised during this period, but the wind-profile data were otherwise unaffected.
Start	2011-11-08 11:20
End	2011-11-08 11:50
Added	2011-11-08 14:33
Author	DAH

[Data]

Number	695	Instrument: MST Radar. The radar was stopped to allow LD to carry out tests on a few individual Yagis within the antenna array. This was motivated by the problems caused by transmitter TX1 in recent months.
Start	2011-11-11 10:15
End	2011-11-11 11:00
Added	2011-11-14 08:15
Author	DAH

[Data]

Number	696	Instrument: UPS units. All units indicated a brief irregularity in the incoming electricity.
Start	2011-11-12 03:13
End	2011-11-12 03:13
Added	2011-11-14 08:22
Author	DAH

[Data]

Number	697	Instrument: MST Radar. The radar was powered down to allow LD to carry out tests on some of the Yagis within the antenna array.
Start	2011-11-15 11:00
End	2011-11-15 11:30
Added	2011-11-15 13:42
Author	DAH

[Data]

Number	711	Instrument: MST Radar. One of the transmitters (TX1) went down shortly after LD had been on site. He made a special visit later in the day to fix it.
Start	2011-11-15 14:00
End	2011-11-15 16:30
Added	2012-01-23 12:35
Author	DAH

[Data]

Number	776	Instrument: MST Radar. The radar went off line as a result of an ATRAD engineer trying to fix the error-logging system on the beam steering controller PC. This inadvertently caused a recursive loop in the system, which stopped it from doing its primary job. The radar was restarted when LD was on site.
Start	2011-11-16 01:15
End	2011-11-16 12:15
Added	2012-06-06 11:34
Author	DAH

[Data]

Number	698	Instrument: MST Radar. One of the transmitters (TX1) was out of action for the whole of this period whilst LD carried out maintenance work on it. A second transmitter, which feeds one of the outer rings of the antenna array, was also taken out of action 13:00 - 15:30, to allow Aberystwyth University students to carry out a surveying practical on the array. The altitude coverage is notably reduced during this second period, although the quality of the data should not have been seriously affected.
Start	2011-11-22 10:30
End	2011-11-22 15:30
Added	2011-11-25 14:02
Author	DAH

[Data]

Number	699	Instrument: MST Radar. The noise floor was raised during this period, which suggests that one of the transmitters may have been out of operation. This resulted in slightly reduced altitude coverage, although the quality of the data should be unaffected.
Start	2011-11-29 10:00
End	2011-11-29 14:00
Added	2011-12-01 08:21
Author	DAH

[Data]

Number	700	Instrument: UPS units. Four of the units inidicated that they were on battery power for approximately 10 s in response to a mains input problem.
Start	2011-12-21 04:21
End	2011-12-21 04:21
Added	2011-12-21 08:13
Author	DAH

[Data]

Number	701	Instrument: UPS units. The units inidicated that they were on battery power for approximately 20 s in response to a mains input problem.
Start	2011-12-21 10:02
End	2011-12-21 10:02
Added	2011-12-21 10:13
Author	DAH

[Data]

Number	702	Instrument: UPS units. All units inidicated that there was a disruption in the mains electricity supply which lasted for approximately 12 s.
Start	2011-12-22 19:46
End	2011-12-22 19:46
Added	2012-01-03 08:25
Author	DAH

[Data]

Number	1889	Instrument: MST Radar. The v4 wind speed within a narrow altitude band at around 9.5 km is unrealistically enhanced compared to that at adjacent times and altitudes.
Start	2011-12-26 13:50
End	2011-12-26 14:40
Added	2017-09-22 13:43
Author	DAH

[Data]

Number	703	Instrument: Campbell Scientific Surface Wind Sensors. No reliable wind data were recorded for this period. It's not clear what caused the problem, which coincided with very strong winds in the area. Mean speeds were in excess of 15 m/s when the problem began. The minimum wind gust speeds do not appear to be reliable until around 2012-01-05 12:00 UT, i.e. ten and a half hours after the mean wind speeds became reliable.
Start	2012-01-03 08:34
End	2012-01-05 01:21
Added	2012-01-09 08:38
Author	DAH

[Data]

Number	704	Instrument: MST Radar. The radar was stopped to allow LD to change phasing unit 62 within the antenna array. The readings from this unit, particluarly the high VSWR values, have been abnormal for some time. However, no attempt was made to swap it during the DIAMET/TROSIAD campaign period in late 2011.
Start	2012-01-10 10:30
End	2012-01-10 11:00
Added	2012-01-10 11:08
Author	DAH

[Data]

Number	705	Instrument: MST Radar. One of the transmitters (TX1) went down, which caused the noise floor to be raised. This does not appear to have caused any contamination of the wind-profile data although it did result in a noticeable reduction in useful altitude coverage. LD changed the blower motor on TX1 whilst it was powered down.
Start	2012-01-19 16:50
End	2012-01-20 11:20
Added	2012-01-20 13:46
Author	DAH

[Data]

Number	714	Instrument: MST Radar. The noise floor was raised as a result of one of the transmitters (TX1) going down. Despite this being a Saturday, LD was in the area and so visited the site. He had fixed the transmitter by 15:15 but it went down again at around 17:30 UT. LD spotted this from the quick-look plots and, since he was still in the area, returned to site to restart the radar.
Start	2012-01-21 00:00
End	2012-01-21 22:00
Added	2012-01-27 08:42
Author	DAH

[Data]

Number	712	Instrument: MST Radar. The noise floor was dramatically raised during the earlier part of this period, i.e. 10:30 - 12:30 UT, which lead to a large reduction in useful altitude coverage. LD made an emergency visit to the site. Unexpectedly, none of the transmitters had gone down. He disconnected the receiver feed for each of the 5 antenna sectors in turn and found that the noise level dropped after he disconnected sector E, which is associated with TX6. LD also found that the auxilliary fan for the pre-processor unit had seized up, although this is not thought to have contributed to the problem. He left the receiver feed for sector E disconnected.
Start	2012-01-25 10:30
End	2012-01-25 14:00
Added	2012-01-23 14:18
Author	DAH

[Data]

Number	716	Instrument: Broadband Modem. The internet connection went down just after 00:00 on 2012-02-05, a Sunday morning. BT tests show that there was a problem with the external line. However, internet connectivity was restored a short while after DPW rebooted the modem on the Monday morning - despite the fact that BT did not send an engineer to investigate until the following day. There was a backlog of files to transfer after the connection was restored.
Start	2012-02-05 00:00
End	2012-02-06 09:40
Added	2012-02-07 15:26
Author	DAH

[Data]

Number	717	Instrument: MST Radar. A knock-on effect of the internet blockage which began at 2012-02-05 00:00 UT was that the flow of data through the signal processing chain was interrupted. Consequently the time-continuity algorithm was comparing the latest observations with those made over 24 hours previously - it should only compare them with observations made in the previous hour. Owing to the relatively-unchanging wind conditions, this did not initially have a noticeable impact. However, the mid-tropospheric wind coverage began to be significantly reduced by 2012-02-08 12:00 UT. DAH first became aware of the problem owing to the fact that the daily radial files were approximately 1/10th the size of usual. The problem was resolved by DAH manually clearing the data flow system.
Start	2012-02-05 00:00
End	2012-02-09 09:45
Added	2012-02-13 08:25
Author	DAH

[Data]

Number	715	Instrument: MST Radar. One of the transmitters, TX1, went down, which lead to a raised noise floor. This should not have affected the quality of the wind-profile data. LD made an unscheduled visit to the site on the morning of 2012-02-06. However, TX1 went down again shortly afterwards and LD had to return to site later in the day to restart it.
Start	2012-02-05 00:50
End	2012-02-06 15:30
Added	2012-02-07 15:21
Author	DAH

[Data]

Number	719	Instrument: MST Radar. One of the transmitters, TX1, went down which resulted in a raising of the noise floor. LD made an unscheduled visit to the site to restart the transmitter.
Start	2012-02-08 19:00
End	2012-02-09 10:20
Added	2012-02-13 08:43
Author	DAH

[Data]

Number	718	Instrument: MST Radar. The radar was powered down to allow LD to switch the position of one of the transmitters, TX1, which has been suffering a high failure rate recently. It was not clear whether it was the transmitter itself or the sector (A) of the antenna which is was powering that was the root cause of the problem. Consequently LD switched its position with the transmitter which was initially powering sector B.
Start	2012-02-10 10:20
End	2012-02-10 11:20
Added	2012-02-13 08:35
Author	DAH

[Data]

Number	720	Instrument: UPS units. All units indicated a 5 s disruption of the mains electricity.
Start	2012-02-13 08:52
End	2012-02-13 08:52
Added	2012-02-13 09:04
Author	DAH

[Data]

Number	721	Instrument: Vaisala WXT510. The WXT510's piezo-electric sensor detected hardly any rain during this 6 hour period period although the tipping bucket raingauge detected it quasi-continuously. The rain rain (~ 1mm/hour) was very low and so it may have been difficult for the WXT510 to detect. Similar instances have occurred in the past.
Start	2012-02-16 14:00
End	2012-02-16 20:00
Added	2012-02-17 08:22
Author	DAH

[Data]

Number	725	Instrument: Vaisala LD40. There are a few short gaps in the recorded data for this period. The reason is unknown.
Start	2012-02-16 16:30
End	2012-02-16 18:10
Added	2012-02-21 09:35
Author	DAH

[Data]

Number	723	Instrument: MST Radar. One of the transmitters, TX1, happened to go down whilst LD was on site. He was able to fix it and restart it within 15 minutes.
Start	2012-02-17 09:45
End	2012-02-17 10:00
Added	2012-02-21 09:13
Author	DAH

[Data]

Number	726	Instrument: Vaisala LD40. There are a few short gaps in the recorded data for this period - at around 07:00, 14:05, 17:10 and 23:45 UT. The reason for this unknown.
Start	2012-02-18 07:00
End	2012-02-18 23:59
Added	2012-02-21 09:38
Author	DAH

[Data]

Number	727	Instrument: Vaisala LD40. There are two short gaps in the recorded data for this period. The reason for this is unknown.
Start	2012-02-19 01:40
End	2012-02-19 02:45
Added	2012-02-21 09:39
Author	DAH

[Data]

Number	722	Instrument: Broadband modem. The internet connection to the site was down for just over 24 hours. It was restored by DPW power-cycling the broadband modem when he arrived on site. Eclipse, the ISP, confirmed that they had carried out an administrative reset on the line at around 2012-02-19 06:20 UT (a Sunday morning). These are carried out automatically on the rare occasions when there is a technical problem - in this case one which affected many of their customers. However, Eclipse could not see any reason for a similar loss of internet at the radar site on 2012-02-05.
Start	2012-02-19 06:20
End	2012-02-20 09:45
Added	2012-02-20 11:38
Author	DAH

[Data]

Number	724	Instrument: MST Radar. There is an apparent gap in the wind-profile data between altitudes of 5 and 10 km. This is a knock-on effect of the loss of the internet connection on 2012-02-19, which interrupted the data flow. This caused the time-continuity algorithm to compare the latest observations with those made over 24 hours ago. It should only compare them with observations made in the latest hour. The problem was resolved by DAH manually clearing the older files.
Start	2012-02-20 04:20
End	2012-02-20 08:45
Added	2012-02-21 09:24
Author	DAH

[Data]

Number	728	Instrument: MST Radar. The radar suffered from a short period of interference. This led to a reduction in useful altitude coverage for the wind-profile data.
Start	2012-02-26 04:00
End	2012-02-26 04:50
Added	2012-02-27 08:16
Author	DAH

[Data]

Number	729	Instrument: MST Radar. The radar suffered from a short period of interference or from a raised noise floor. This resulted in a reduction in useful altitude coverage for wind-profiles.
Start	2012-02-27 15:15
End	2012-02-27 17:30
Added	2012-02-28 08:35
Author	DAH

[Data]

Number	730	Instrument: MST Radar. The radar suffered from a short period of a raised noise floor. This lead to a reduction in useful altitude coverage for wind-profiling purposes, principally during the earlier part of the period.
Start	2012-03-02 06:40
End	2012-03-02 10:00
Added	2012-03-05 08:19
Author	DAH

[Data]

Number	731	Instrument: MST Radar. The radar suffered from a short period of a raised noise floor. This lead to a reduction in useful altitude coverage for wind-profiles.
Start	2012-03-02 23:00
End	2012-03-02 23:50
Added	2012-03-05 08:24
Author	DAH

[Data]

Number	732	Instrument: MST Radar. The radar was powered down to allow work to be carried out within the antenna array. The wooden shacks which house the primary power splitters are being replaced.
Start	2012-03-08 11:55
End	2012-03-08 15:38
Added	2012-03-09 08:13
Author	DAH

[Data]

Number	733	Instrument: Vaisala WXT510. Since the MST radar was powered down, the opportunity was taken to reboot PC augustus, which acquires data from the Vaisala WXT510, as well as the MST radar. This lead to a two and a half hour gap in WXT510 coverage. Since the PC is rarely rebooted, it performs a lengthy disk check on retstart.
Start	2012-03-08 12:06
End	2012-03-08 14:45
Added	2012-03-09 08:20
Author	DAH

[Data]

Number	734	Instrument: MST Radar. The radar was powered down to allow work to be carried out within the antenna array. The wooden shacks which house the primary power splitters are being replaced.
Start	2012-03-09 10:00
End	2012-03-09 14:20
Added	2012-03-12 08:31
Author	DAH

[Data]

Number	735	Instrument: MST Radar. The radar suffered from a short period of raised noise floor, which lead to a reduction in useful altitude coverage for wind-profiling purposes.
Start	2012-03-12 08:20
End	2012-03-12 10:40
Added	2012-03-13 08:14
Author	DAH

[Data]

Number	737	Instrument: MST Radar. The radar suffered intermittently from a raised noise floor, caused by transmitter TX1 going down.
Start	2012-03-12 19:30
End	2012-03-13 09:42
Added	2012-03-16 08:42
Author	DAH

[Data]

Number	738	Instrument: MST Radar. The radar was powered down to allow the huts housing the primary power splitters to be replaced.
Start	2012-03-13 09:42
End	2012-03-13 16:24
Added	2012-03-16 08:43
Author	DAH

[Data]

Number	739	Instrument: MST Radar. The radar was powered down to allow the huts housing the primary power splitters to be replaced.
Start	2012-03-14 09:50
End	2012-03-14 15:50
Added	2012-03-30 13:18
Author	DAH

[Data]

Number	740	Instrument: MST Radar. The radar was powered down to allow the huts housing the primary power splitters to be replaced.
Start	2012-03-15 09:30
End	2012-03-15 16:30
Added	2012-03-30 13:21
Author	DAH

[Data]

Number	736	Instrument: Vaisala WXT510. A gap in data coverage resulted from the acquisition PC, augustus, needing to be rebooted.
Start	2012-03-15 09:55
End	2012-03-15 12:56
Added	2012-03-16 08:32
Author	DAH

[Data]

Number	741	Instrument: MST Radar. The radar was powered down to allow the huts housing the primary power splitters to be replaced.
Start	2012-03-16 10:05
End	2012-03-16 11:46
Added	2012-03-30 13:23
Author	DAH

[Data]

Number	742	Instrument: MST Radar. The noise floor was raised after two of the transmitters, TX3 and TX5, went down. LD came onto site on Saturday 17th and replaced the fuse on TX3, for which he had recently upped the output power level. He was unable to get TX5, which was indicating an HV error, restarted. He disconnected its receiver feed in order to avoid a noise floor issue.
Start	2012-03-16 18:00
End	2012-03-17 15:00
Added	2012-03-30 13:30
Author	DAH

[Data]

Number	743	Instrument: Broadband modem. The internet connection to the site was lost. It is assumed that the problem originated at the ISP's end. DAH spotted the problem as he happened to be in the office (a Saturday) making conference preparations. DPW happened to need to go to site and power-cycled the modem, which cleared the problem.
Start	2012-03-16 23:20
End	2012-03-17 14:30
Added	2012-03-30 13:34
Author	DAH

[Data]

Number	744	Instrument: MST Radar. There were multiple transmitter problems and LD found 3 of them out of action when he visited the site on Sunday 18th. He could not get one of them, TX6, restarted. The start date-time of these problems is estimated from the m300 data plot, which indicates a raised noise floor after the given time.
Start	2012-03-17 17:00
End	2012-03-18 15:30
Added	2012-03-30 13:39
Author	DAH

[Data]

Number	745	Instrument: MST Radar. LD managed to get TX6 restarted after he discovered the cause of the problem connected with the 6 kV power supply. He changed the bridge rectifier and got the transmitter back into operation.
Start	2012-03-23 12:00
End	2012-03-23 12:00
Added	2012-03-30 13:41
Author	DAH

[Data]

Number	746	Instrument: MST Radar. The radar was powered down to allow a ATRAD engineer to inspect the beam steering components and to add some new modules to the couplers.
Start	2012-03-27 08:50
End	2012-03-27 15:00
Added	2012-03-30 13:43
Author	DAH

[Data]

Number	747	Instrument: MST Radar. The radar was powered down during two periods, 09:55 - 13:10 and 14:00 - 15:10, to allow beam steering components to be tested.
Start	2012-03-28 09:55
End	2012-03-28 15:10
Added	2012-03-30 13:45
Author	DAH

[Data]

Number	748	Instrument: Broadband Modem. The modem lost its internet connection for over 2 hours. LD spotted this from IMAPS and visited the site in order to power-cycle the unit.
Start	2012-03-30 13:51
End	2012-03-30 15:51
Added	2012-04-02 10:03
Author	DAH

[Data]

Number	749	Instrument: MST Radar. At least one of the radar transmitters was down during this period, when LD was away on leave, though two of them (for antenna sectors A and C) were found to be down on 2012-04-11. The noise floor was raised for much of this period which caused a reduction in useful altitude coverage.
Start	2012-04-02 19:30
End	2012-04-11 08:45
Added	2012-04-13 15:01
Author	DAH

[Data]

Number	750	Instrument: MST Radar. The radar was stopped to allow an engineer from ATRAD to update the beam steerng software. In principle the radar could have been restarted after only 20 minutes or so. However, since LD was on site, he took the opportunity to fix the transmitters for antenna sectors A and C before the radar was restarted.
Start	2012-04-11 07:55
End	2012-04-11 08:44
Added	2012-04-13 15:11
Author	DAH

[Data]

Number	751	Instrument: MST Radar. The radar was again stopped for a short period to allow an ATRAD engineer to update the beam steering software.
Start	2012-04-11 11:45
End	2012-04-11 12:07
Added	2012-04-13 15:12
Author	DAH

[Data]

Number	752	Instrument: MST Radar. The radar suffered from a short period of raised noise floor. This was most intense during the period 21:00 - 22:20 UT, when the useful altitude coverage for wind-profiling was noticeably reduced.
Start	2012-04-16 19:00
End	2012-04-16 22:20
Added	2012-04-17 09:25
Author	DAH

[Data]

Number	753	Instrument: MST Radar. One of the transmitters went down, which lead to a raising of the noise floor a reduction in useful altitude coverage. Owing to changes ATRAD had made to the beam steering controller software, this was the first time that the unit sent automatic emails to warn DAH about both the transmitter going down and coming back up. LD made a un-scheduled visit to the site in order to restart the transmitter.
Start	2012-04-17 12:52
End	2012-04-17 14:08
Added	2012-04-19 08:26
Author	DAH

[Data]

Number	754	Instrument: MST Radar. One of the transmitters, for antenna sector A, went down, leading to an increase in the noise floor - and a reduction in useful height coverage. LD made an unscheduled visit to the site in order to restart it.
Start	2012-04-19 03:25
End	2012-04-19 13:12
Added	2012-04-20 08:09
Author	DAH

[Data]

Number	755	Instrument: MST Radar. The transmitter for antenna sector A went down, which lead to a raised noise floor and reduced useful altitude coverage. LD was on site at the time and restarted the transmitter.
Start	2012-04-26 10:14
End	2012-04-26 10:59
Added	2012-04-27 08:12
Author	DAH

[Data]

Number	756	Instrument: MST Radar. The transmitter for antenna sector A went down, causing a raised noise floor and a reduction is useful altitude coverage.
Start	2012-04-27 18:02
End	2012-04-29 17:05
Added	2012-04-30 08:15
Author	DAH

[Data]

Number	757	Instrument: UPS units. All units indicated an approximately 1 s long irregularity in the incoming mains exlectricity. This required them to briefly switch to battery power.
Start	2012-04-28 11:57
End	2012-04-28 11:57
Added	2012-04-30 08:35
Author	DAH

[Data]

Number	758	Instrument: MST Radar. The transmitter for antenna sector A went down, which caused a raised noise floor and a reduction in useful altitude coverage.
Start	2012-04-30 01:53
End	2012-04-30 14:16
Added	2012-05-01 08:08
Author	DAH

[Data]

Number	759	Instrument: MST Radar. The transmitter powering antenna sector A went down, causing a raised noise floor and a reduction in useful altitude coverage. LD restarted it during a scheduled visit to the site.
Start	2012-05-07 09:33
End	2012-05-08 08:26
Added	2012-05-10 08:24
Author	DAH

[Data]

Number	760	Instrument: MST Radar. The transmitter powering antenna sector A went down on a Friday evening, leading to a raised noise floor and a reduction in useful altitude coverage. LD made an unscheduled visit to the site on the Monday morning, 2012-05-13, and restarted the transmitter at 08:25 UT. However, it was down again by 09:30 UT. LD returned to the site in the afternoon and restarted the transmitter at 15:55 UT.
Start	2012-05-11 21:15
End	2012-05-15 09:38
Added	2012-05-15 09:44
Author	DAH

[Data]

Number	761	Instrument: MST Radar. The radar was stopped for a few minutes after 2012-05-15 09:00 UT. This was part of an ongoing investigation into the cause of frequent problems with the transmitter which powers antenna sector A. LD swapped the cables connecting the transmitter to the phase lock unit with those for another transmitter. At first it was thought that this lead to just a slight reduction in received signal power. However, the "Secondary Radial Chain Exists" diagnostic data indicate that this introduced unwanted signals into the spectra. The problem stopped only when the transmitter went down, which lead to a raising of the noise floor.
Start	2012-05-15 09:00
End	2012-05-17 01:30
Added	2012-05-18 08:12
Author	DAH

[Data]

Number	762	Instrument: MST Radar. The transmitter supplying antenna sector A went down, leading to a riased noise floor and reduced usfeul altitude coverage. The radar was stopped at 08:42 UT to allow LD to revert the phase lock unit cabling to its original configuration.
Start	2012-05-17 01:30
End	2012-05-17 08:53
Added	2012-05-18 08:15
Author	DAH

[Data]

Number	763	Instrument: MST Radar. The transmitter supplying antenna sector A was down during this period, which lead to a raised noise level and reduced altitude coverage. The transmitter was first restarted at 10:37 UT, but was down again almost immediately.
Start	2012-05-18 04:28
End	2012-05-18 10:46
Added	2012-05-21 08:22
Author	DAH

[Data]

Number	764	Instrument: Tipping bucket rainguage. The Vaisala WXT510 detected a moderate and prolonged rain event during this period although the tipping bucket rainguage detected nothing.
Start	2012-05-18 18:00
End	2012-05-18 23:59
Added	2012-05-21 08:27
Author	DAH

[Data]

Number	766	Instrument: MST Radar. The transmitter for antenna sector B went out of action after it blew its fuse. This lead to a raised noise floor and a reduction in useful altitude cover. LD made an unscheduled visit to the site to restart the transmitter.
Start	2012-05-19 06:28
End	2012-05-21 08:30
Added	2012-05-28 09:53
Author	DAH

[Data]

Number	765	Instrument: UPS units. All units indicated a brief (no more than 1 or 2 s) irregulariry in the incoming voltage.
Start	2012-05-19 08:09
End	2012-05-19 08:09
Added	2012-05-21 08:37
Author	DAH

[Data]

Number	770	Instrument: Tipping Bucket Rainguage. LD cleaned out the tipping bucket rainguage with bleach. It had been blocked with a grey crust of what looked like lime scale. The instrument had failed to detect a rain event on 2012-05-18.
Start	2012-05-22 09:25
End	2012-05-22 09:35
Added	2012-05-28 10:04
Author	DAH

[Data]

Number	767	Instrument: MST Radar. The transmitter for antenna sector B went out of action after it blew its fuse. This lead to a raised noise floor and a reduction in useful altitude cover. LD made an unscheduled visit to the site to restart the transmitter.
Start	2012-05-22 13:39
End	2012-05-22 16:58
Added	2012-05-28 09:55
Author	DAH

[Data]

Number	768	Instrument: MST Radar. The transmitter for antenna sector B went out of action after it blew its fuse. This lead to a raised noise floor and a reduction in useful altitude cover. LD made an unscheduled visit to the site to restart the transmitter.
Start	2012-05-22 23:44
End	2012-05-23 08:50
Added	2012-05-28 09:57
Author	DAH

[Data]

Number	769	Instrument: MST Radar. The radar was powered down to allow a final coat of weather-proofing to be applied to the new primary power splitter huts within the antenna array.
Start	2012-05-24 08:57
End	2012-05-24 13:16
Added	2012-05-28 09:59
Author	DAH

[Data]

Number	772	Instrument: Frongoch surface wind sensors. A problem with the telephone line at the Frongoch end has meant it has not been possible to download data since 2012-05-25. (Continued on 2012-07-02). It turns out that there was a problem with the telephone line and a new pole had to be fitted somewhere along its length (presumably near Frongoch). Although the line was nominally working on 2012-06-29, a data connection could not be established until 2012-07-02.
Start	2012-05-25 10:00
End	2012-07-02 09:00
Added	2012-06-06 09:10
Author	DAH

[Data]

Number	773	Instrument: Vaisala WXT510 surface met sensors. The piezo-electric rain sensor failed to detect mild precipitation events during this period. From the sky-camera images, it looks likely that the gentleness of the rain was the reason that it was not detected.
Start	2012-06-01 01:10
End	2012-06-01 10:20
Added	2012-06-06 09:18
Author	DAH

[Data]

Number	774	Instrument: Vaisala WXT510 surface met sensors. During this period, both the tipping bucket rainguage and the WXT510 managed to detect a rain event. This suggests that the failure of the WXT510 to detect rain events on 2012-06-01 was related to the nature of the rain (gentle) rather than to an instrument problem.
Start	2012-06-02 19:30
End	2012-06-03 00:30
Added	2012-06-06 09:22
Author	DAH

[Data]

Number	775	Instrument: Vaisala WXT510 surface met sensors. Again, the piezo-electric rain sensor of the WXT510 failed to detect a mild rain event that was seen by the tipping bucket rainguage. This is attributed to the gentleness of the rain rather than an instrument problem.
Start	2012-06-03 06:00
End	2012-06-03 10:10
Added	2012-06-06 09:24
Author	DAH

[Data]

Number	771	Instrument: MST Radar. The transmitter powering antenna sector A went down, causing a raised noise floor and reduced altitude coverage. LD made an unscheduled visit to the site to restart the transmitter.
Start	2012-06-04 20:20
End	2012-06-05 09:41
Added	2012-06-06 09:07
Author	DAH

[Data]

Number	777	Instrument: MST Radar. The transmitter powering antenna sector A went down, causing a raised noise floor and a reduction in useful altitude cover.
Start	2012-06-06 17:55
End	2012-06-07 11:34
Added	2012-06-08 08:15
Author	DAH

[Data]

Number	778	Instrument: MST Radar. The radar suffered from a short period of interference (10:30 - 12:30 UT), which reducd useful altitude cover. Then the transmitter powering antenna sector A went down at 12:45 UT. This lead to a raised noise floor and a reduction in altitude cover. LD made an unscheduled visit to the site to restart the transmitter.
Start	2012-06-08 10:30
End	2012-06-08 17:02
Added	2012-06-11 08:10
Author	DAH

[Data]

Number	779	Instrument: UPS units. The units indicated a brief (i.e. ~ 1 s) irregularity in the incoming mains electricity supply.
Start	2012-06-11 15:19
End	2012-06-11 15:19
Added	2012-06-12 08:27
Author	DAH

[Data]

Number	780	Instrument: MST Radar. The radar suffered from a short period of interference. This lead to a reduction in useful height cover.
Start	2012-06-14 14:30
End	2012-06-14 15:30
Added	2012-06-15 08:10
Author	DAH

[Data]

Number	781	Instrument: UPS units. The units indicated a brief (~ 1s) input power problem.
Start	2012-06-18 05:31
End	2012-06-18 05:31
Added	2012-06-18 08:07
Author	DAH

[Data]

Number	782	Instrument: MST Radar. The transmitter powering antenna sector B blew its choke. This lead to a bried period when the noise floor was raised. LD was on site at the time and fixed it.
Start	2012-06-22 11:21
End	2012-06-22 11:37
Added	2012-06-22 14:58
Author	DAH

[Data]

Number	784	Instrument: Tipping bucket raingauge. This instrument failed to detect an intense rainfall event, which was seen by the WXT510 piezo-electric sensor.
Start	2012-06-26 08:10
End	2012-06-26 09:50
Added	2012-06-28 08:20
Author	DAH

[Data]

Number	786	Instrument: Tipping bucket raingauge. LD cleaned out the tpping bucket, which had become clogged with grass seeds. It had been unable to detect two rain events on 2012-06-26 and on 2012-06-28.
Start	2012-06-26 08:10
End	2012-06-29 10:00
Added	2012-06-29 11:04
Author	DAH

[Data]

Number	783	Instrument: MST Radar. The radar was powered down briefly so that LD could change the phasing unit for quad 28. This had been showing status "ready, but low power" for about a weak. Although the status had actually returned to normal on the morning when it was wapped, LD decided to bring it in for investigation in any case.
Start	2012-06-26 09:55
End	2012-06-26 10:14
Added	2012-06-26 11:24
Author	DAH

[Data]

Number	785	Instrument: Tipping bucket raingauge. This instrument failed to detect a moderately-intense rainfall event, which was seen by the WXT510 piezo-electric sensor.
Start	2012-06-28 09:20
End	2012-06-28 10:10
Added	2012-06-29 08:06
Author	DAH

[Data]

Number	787	Instrument: MST Radar. The transmitter powering antenna sector A tripped out of action. This lead to a raised noise level and a reduction in useful altitude cover.
Start	2012-06-29 16:39
End	2012-07-02 09:01
Added	2012-07-02 11:48
Author	DAH

[Data]

Number	788	Instrument: MST Radar. The transmitter powering antenna sector A went out of action. This lead to a raised noise floor and a reduction in useful altitude cover. LD made an unscheduled visit to the site to restart the transmitter at 2012-07-03 17:16 UT. However, it went down again just half an hour later at 17:45 UT. LD suspects that this was because he hadn't given it time to warm up properly.
Start	2012-07-03 15:21
End	2012-07-04 10:10
Added	2012-07-05 09:07
Author	DAH

[Data]

Number	789	Instrument: UPS units. There were two brief (i.e. ~ 1 s) problems with the input electricity supply - at 08:35 and at 08:38 UT.
Start	2012-07-06 08:25
End	2012-07-06 08:38
Added	2012-07-06 11:44
Author	DAH

[Data]

Number	790	Instrument: Vaisala WXT510 rain sensor. The piezo-electric rain sensor failed to detect a weak rain event, which was seen by the tipping bucket raingauge.
Start	2012-07-08 17:50
End	2012-07-08 23:00
Added	2012-07-09 08:18
Author	DAH

[Data]

Number	791	Instrument: MST Radar. The transmitter powering antenna sector B blew its fuse, leading to a raised noise floor and a reduction in useful altitude cover. LD made an unscheduled visit to the site in order to restart it.
Start	2012-07-10 18:47
End	2012-07-11 08:43
Added	2012-07-11 09:54
Author	DAH

[Data]

Number	793	Instrument: MST Radar. The transmitter powering antenna sector A went out of action. This lead to a raised noise floor and a reduction in useful altitude cover. DPW restarted the transmitter.
Start	2012-07-12 22:31
End	2012-07-13 10:29
Added	2012-07-16 08:10
Author	DAH

[Data]

Number	792	Instrument: MST Radar. The transmitter powering antenna sector A went down, leading to a raised noise flloor and a reduction in useful altitude cover. LD made an unscheduled visit to the site to restart it.
Start	2012-07-13 15:31
End	2012-07-14 12:28
Added	2012-07-14 14:25
Author	DAH

[Data]

Number	794	Instrument: MST Radar. The transmitter powering antenna sector B blew its fuse. This lead to a raised noise floor and a reduction in useful altitude cover. LD made an unscheduled visit to the site in order to restart the transmitter.
Start	2012-07-18 22:31
End	2012-07-19 13:47
Added	2012-07-19 15:05
Author	DAH

[Data]

Number	795	Instrument: MST Radar. The transmitter powering antenna sector A automatically shut down. This lead to a raised noise floor and a reduction in useful altitude cover.
Start	2012-07-19 17:47
End	2012-07-20 08:24
Added	2012-07-23 08:08
Author	DAH

[Data]

Number	796	Instrument: UPS units. The units indicated a brief (< 1 s) irregularity of the incoming mains electricity supply.
Start	2012-07-24 10:33
End	2012-07-24 10:33
Added	2012-07-24 16:14
Author	DAH

[Data]

Number	797	Instrument: UPS units. The units indicated a brief (~ 1 s) irregularity of the incoming electricity supply.
Start	2012-07-25 09:00
End	2012-07-25 09:00
Added	2012-07-25 10:15
Author	DAH

[Data]

Number	801	Instrument: Broadband modem. A problem with a BADC computer, which started at around 2012-07-27 17:00 UT, prevented data from being transferred from the mst radar site until around 2012-07-30 08:00. It took the rest of that day, i.e. until around 2012-07-30 19:00 UT, until the backlog of file transfers was completed. During this period, the broadband connection was very slow owing to the large volume of continuous traffic.
Start	2012-07-27 17:00
End	2012-07-30 19:00
Added	2012-07-31 12:16
Author	DAH

[Data]

Number	798	Instrument: MST Radar. The transmitter powering antenna sector A shut down, which lead to an increase in noise level and to a reduction in useful altitude cover. LD made an unscheduled visit to the site in order to restart the transmitter.
Start	2012-07-29 05:50
End	2012-07-29 11:34
Added	2012-07-30 10:15
Author	DAH

[Data]

Number	799	Instrument: MST Radar. The transmitter powering antenna sector A shut down, which lead to an increase in noise level and to a reduction in useful altitude cover. LD made an unscheduled visit to the site in order to restart the transmitter.
Start	2012-07-30 07:58
End	2012-07-30 09:02
Added	2012-07-30 10:26
Author	DAH

[Data]

Number	800	Instrument: MST Radar. The transmitter powering antenna sector A went out of action, which lead to an increase in noise level and a reduction in altitude cover. LD made an unscheduled visit to the site and restarted the transmitter at around 2012-07-30 15:40 UT. However, it went down again by 2012-07-30 17:00 and remained out of action until 2012-07-31 08:48.
Start	2012-07-30 14:48
End	2012-07-31 08:48
Added	2012-07-31 12:12
Author	DAH

[Data]

Number	1885	Instrument: MST Radar. The v4 wind data show some mild contamination from interference at altitudes above 17 km.
Start	2012-08-02 16:50
End	2017-08-02 18:00
Added	2017-09-20 16:33
Author	DAH

[Data]

Number	803	Instrument: MST Radar. The transmitter powering antenna sector A shut down, leading to a raised noise floor and a reduction in useful altitude cover. LD made an unscheduled visit to the site to restart the transmitter at 2012-08-05 17:50 UT, but it went down again just 7 minutes later. It was restarted 10 minutes after that, i.e. at 18:08 UT.
Start	2012-08-04 05:56
End	2012-08-05 18:08
Added	2012-08-07 10:12
Author	DAH

[Data]

Number	802	Instrument: MST Radar. The transmitter powering antenna sector A shut down, leading to a raised noise floor and a reduction in useful altitude cover. DPW restarted the transmitter.
Start	2012-08-06 09:43
End	2012-08-06 10:51
Added	2012-08-06 13:56
Author	DAH

[Data]

Number	804	Instrument: MST Radar. LD deliberately switched the transmitter powering antenna sector A through its different states so that DAH could test the ability of the txstatus software to read these.
Start	2012-08-07 08:50
End	2012-08-07 08:53
Added	2012-08-07 10:14
Author	DAH

[Data]

Number	805	Instrument: MST Radar. The transmitter powering antenna sector E went down (this ususally affects sector A) which lead to a raised noise floor and a reduction in altitude cover.
Start	2012-08-09 23:18
End	2012-08-10 08:51
Added	2012-08-10 10:29
Author	DAH

[Data]

Number	806	Instrument: MST Radar. The transmitter powering antenna sector A went down, which lead to a raised noise floor and a reduction in altitude cover. LD made an unscheduled visit to the site to restart the transmitter.
Start	2012-08-10 17:09
End	2012-08-13 08:29
Added	2012-08-13 09:34
Author	DAH

[Data]

Number	807	Instrument: MST Radar. The transmitter powering antenna sector A went down, which lead to a raised noise floor and a reduction in cover. LD made an unscheduled visit to site to restart the transmitter.
Start	2012-08-13 11:43
End	2012-08-13 16:05
Added	2012-08-14 10:15
Author	DAH

[Data]

Number	808	Instrument: MST Radar. The transmitter powering antenna sector A went down, which lead to a raised noise floor and reduced altitude cover. DPW restarted the transmitter.
Start	2012-08-16 09:28
End	2012-08-16 11:28
Added	2012-08-17 08:05
Author	DAH

[Data]

Number	809	Instrument MST Radar. The transmitter powering antenna sector A was switched through diffrent states during this period. This was in order to test new software, which can both read the status of the transmitters and switch their states. The tests were successful.
Start	2012-08-17 11:09
End	2012-08-17 11:18
Added	2012-08-17 14:18
Author	DAH

[Data]

Number	810	Instrument: Tipping Bucket Raingauge. There are significant differences between the patterns of rainfall measured by the tipping bucket rainguage and the Vaisala WXT510 over this period. Less rain was recorded by the tipping bucket rainguage and it is likely that it has become (at least partially) blocked. The two instruments measured similar patterns of rainfall on 2012-08-17.
Start	2012-08-18 00:00
End	2012-08-21 13:10
Added	2012-08-22 08:26
Author	DAH

[Data]

Number	811	Instrument: MST Radar. The fuse blew on the transmitter powering sector B. This lead to an increase in the noise level and a reduction in altitude cover. LD made an unscheduled visit to the site on 2012-08-19 (a Sunday) to replace the fuse. Although the transmitter was restarted at 12:54 UT, the fuse blew again at 13:08. LD restarted it at 13:23, but the fuse blew again at 14:08. The transmitter remained out of action until LD made his next scheduled visit to the site on 2012-08-21.
Start	2012-08-18 20:56
End	2012-08-21 10:21
Added	2012-08-22 08:39
Author	DAH

[Data]

Number	812	Instrument. MST Radar. The transmitter powering antenna sector A shut down at a time when the transmitter for sector B was already out of action. This lead to a larger than usual reduction in altitude cover. For the first time, DAH was successfully able to restart the transmitter (for sector A) using software that he has been developing.
Start	2012-08-20 23:26
End	2012-08-21 08:46
Added	2012-08-22 08:59
Author	DAH

[Data]

Number	813	Instrument: MST Radar. The transmitter powering antenna sector A shut down, which lead to a raised noise floor and reduced altitude cover. On this occassion, DAH was unable to restart the transmitter remotely. It turns out that this was a result of (erroneous) changes he had made to the computer code since he had first demonstrated its usefulness.
Start	2012-08-22 09:37
End	2012-08-22 15:51
Added	2012-08-23 11:21
Author	DAH

[Data]

Number	814	Instrument: MST Radar. The transmitter powering antenna sector A shut down, which lead to a raised noise floor and reduced altitude cover. DAH was successfully able to restart the transmitter remotely after he had made suitable changes to the necessary computer code.
Start	2012-08-22 20:17
End	2012-08-23 10:13
Added	2012-08-23 11:23
Author	DAH

[Data]

Number	815	INstrument: MST Radar. The transmitter powering antenna sector A went down. DAH was able to restart the transmitter, although he was unsuccessful on his first attempt.
Start	2012-08-23 12:58
End	2012-08-23 13:46
Added	2012-08-23 15:01
Author	DAH

[Data]

Number	816	Instrumet: Tipping Bucket Raingauge. LD cleaned out the instrument, which had become blocked with seeds.
Start	2012-08-23 16:00
End	2012-08-23 16:15
Added	2012-08-24 08:38
Author	DAH

[Data]

Number	820	Instrument: MST Radar. The transmitter powering antenna sector A blew its fuse. This appears to have lead to only intermittent reductions in useful altitude cover.
Start	2012-08-23 21:44
End	2012-08-28 09:25
Added	2012-08-28 11:49
Author	DAH

[Data]

Number	817	Instrument: MST Radar. The transmitter powering antenna sector A shut down, leading to a raised noise level and reduced altitude cover. DAH restarted the transmitter remotely, although it took him several attempts.
Start	2012-08-23 23:23
End	2012-08-24 08:34
Added	2012-08-24 09:39
Author	DAH

[Data]

Number	819	INstrument: UPS units. The units indicated a brief (~ 1 s) irregularity of the mains electricity supply.
Start	2012-08-25 07:57
End	2012-08-25 07:57
Added	2012-08-28 08:48
Author	DAH

[Data]

Number	818	Instrument: MST Radar. The transmitter powering antenna sector A shut down, which lead to a raised noise level and a reduction in altitude cover. DAH restarted the transmitter remotely.
Start	2012-08-25 10:31
End	2012-08-25 14:52
Added	2012-08-28 08:36
Author	DAH

[Data]

Number	823	Instrument: Vaisala WXT510 precipitation sensor. This sensor failed to detect rain, which was see by the tipping bucket raingauge. Images from the sky-camera suggest that the rain was falling very lightly and so might not ahave generated a sufficient piezo-electric signal.
Start	2012-08-31 17:00
End	2012-08-31 19:40
Added	2012-09-05 08:49
Author	DAH

[Data]

Number	821	Instrument: MST Radar. The transmitter powering antenna sector A shut down with a error code 6. This lead to a raised noise floor and a reduction in cover. DAH restarted the transmitter remotely.
Start	2012-09-01 17:47
End	2012-09-01 18:51
Added	2012-09-04 08:07
Author	DAH

[Data]

Number	824	Instrument: Tipping Bucket Raingauge. The inlet became partially blocked with dead insects, which LD cleared at 2012-09-04 10:00 UT. The blockage appears to have slowed down the rate at which water could enter the mechanism and so made the rain appear to be more persistent than it really was. Images from the sky-camera suggest that the first period of rain, which began at 2012-09-01 22:00 UT, ended by 2012-09-02 13:00 UT. The skies became largely clear by 16:00 UT of that day and remained so until at least 20:00 UT, after which it was too dark to see. The follwoing morning, i.e. 2012-09-03 began with clear skies. which persisted until at least 12:00 UT. Although it became cloudy in the afternoon, it does not appear to have rained. It appears to have rained very mildly during the morning of 2012-09-04. This ceased before 10:00 UT. The WXT510 recorded almost negligible amounts of rain during this entire period, probably because the rain was too light to be effectively detected.
Start	2012-09-01 22:00
End	2012-09-04 10:00
Added	2012-09-05 09:03
Author	DAH

[Data]

Number	822	Instrument: MST Radar. The transmitter powering antenna sector A shut down with error code 4. This lead to a raised noise level and a reduction in altitude cover. DAH restarted the transmitter remotely.
Start	2012-09-05 00:10
End	2012-09-05 07:24
Added	2012-09-05 08:30
Author	DAH

[Data]

Number	825	Instrument: MST Radar. The transmitter powering antenna sector A shut down with error code 4. DAH restarted the transmitter remotely.
Start	2012-09-05 12:57
End	2012-09-05 13:20
Added	2012-09-05 14:37
Author	DAH

[Data]

Number	827	Instrument: UPS units. All units indicated a relatively long, i.e. 13 s, input power problem.
Start	2012-09-08 15:48
End	2012-09-08 15:48
Added	2012-09-10 08:22
Author	DAH

[Data]

Number	826	Instrument: MST Radar. The transmitter powering antenna sector A shut down with error code 4. This leadf to a raised noise level and a reduction in altitude cover. DAH was able to restart the transmitter remotely, although it took him several attempts before the transmitter was able to stably remain with the main power switched on.
Start	2012-09-09 06:28
End	2012-09-09 08:40
Added	2012-09-10 08:07
Author	DAH

[Data]

Number	831	Instrument: Vaisala WXT510. Owing to tests being carried out with a replacement radar control and data acquisition PC, there is a gap in the recorded WXT510 data. In fact, data were recorded until 15:37 UT on 2012-09-10. However, owing to a software problem with handling data gaps, it has not been possible to create the netCDF files at the present time. It proved possible to record WXT510 to the new PC (julius) using a 9-way D-type to USB converter.
Start	2012-09-10 00:00
End	2012-09-11 17:47
Added	2012-09-13 09:50
Author	DAH

[Data]

Number	828	Instrument: MST Radar. The radar was briefly out of action to allow "julius", a replacement for the current radar-control and data acquisition PC "augustus", to be put into place. Julius was left running overnight without any problems.
Start	2012-09-10 16:07
End	2012-09-10 16:55
Added	2012-09-13 08:45
Author	DAH

[Data]

Number	867	Instrument: Cambell Scientific Surface Met Sensors, Cambell Scientific Surface Wind Sensors, Vaisala LD40 Laser Ceilometer. The time stamps for the data collected by these 3 sets of instruments drifted to 311.7 s (approximately 5 minutes) behind the actual time over this 5 month period. The problem was caused by the switch from PC "augustus" to PC "julius" (on 2012-09-10) for controlling the MST radar. PC "gaius", which collects data from the affected instruments, had been synchronising its clock to that of PC "augustus". Consequenly it began a slow drift. The problem was only noticed because DAH had been trying to determine the cause of loss of Surface Wind data, which are collected by "gaius".
Start	2012-09-10 16:07
End	2013-02-04 08:28
Added	2013-03-04 10:14
Author	DAH

[Data]

Number	830	Instrument: MST Radar. The transmitter powering antenna sector B blew its fuse and remained out of action until LD was on site later in the day.
Start	2012-09-11 01:34
End	2012-09-11 13:51
Added	2012-09-13 09:29
Author	DAH

[Data]

Number	829	Instrument: MST Radar. The radar was stopped for several periods during the day (08:30 - 09:58, 11:21 - 13:51, 15:40 - 16:12, 16:54 - 17:48 UT) to allow repairs to be carried out on antenna dipoles. The new PC "julius" had been used to control the radar during the day, but "augustus" was put back into operation a the end.
Start	2012-09-11 08:30
End	2012-09-11 17:48
Added	2012-09-13 09:27
Author	DAH

[Data]

Number	832	Instrument: UPS units. The units indicated a brief, i.e. ~ 1 s, input power problem.
Start	2012-09-12 17:27
End	2012-09-12 17:27
Added	2012-09-13 09:54
Author	DAH

[Data]

Number	833	Instrument: MST Radar. The transmitter powering antenna sector A shut down with error code 4. This lead to an increased noise level and a reduction in altitude cover. DAH was eventually able to restart the transmitter remotely, although the error code 4 state was recurred several times after he switched the main power on.
Start	2012-09-13 17:13
End	2012-09-13 18:58
Added	2012-09-14 08:52
Author	DAH

[Data]

Number	834	Instrument: MST Radar. The transmitter powering antenna sector A shut down with an error code 4. This lead to an increased noise level and a reduction in altitude cover. DAH restarted the transmitter remotely at 07:38 UT on 2012-09-14, but it shut down again at 07:54 UT with the same error code. LD arrived on site shortly afterwards and took over from DAH in restarting the transmitter. Although it was up at 08:04 UT, it shut again a minute later. After several unsuccessful attempts to restart the transmitter by the usual method, LD set about investigating the transmitter. Based on advice from DPW, he tweaked the heater voltage measurement circuitry (effectively modifying the scaling factor; the actual voltage of 15 V registers as close to 10 V) to bring the values within the permissible range. At the time of writing (2012-09-14 13:24 UT) the transmitter is still up, although the beam steering unit has reported several instances of the forward power being slightly below the expected value.
Start	2012-09-13 21:41
End	2012-09-14 10:49
Added	2012-09-14 14:25
Author	DAH

[Data]

Number	1882	Instrument: MST Radar. The v4 data show unrealistically-large wind speeds within a narrow time/altitude region at around 9.5 km.
Start	2012-09-16 06:30
End	2012-09-16 07:15
Added	2017-09-20 15:33
Author	DAH

[Data]

Number	1883	Instrument: MST Radar. The v4 data show unrealistically-large wind speeds within a narrow time/altitude region at around 12.5 km.
Start	2012-09-23 15:30
End	2012-09-23 16:15
Added	2017-09-20 16:15
Author	DAH

[Data]

Number	1884	Instrument: MST Radar. The v4 wind speeds at the lowest range gates (where they are not blanked by the reliability flagging) are significantly larger than at adjacent times and altitudes. This appears to be the result of contamination of the clear air signals by hydrometeor returns.
Start	2012-09-24 05:00
End	2012-09-24 08:00
Added	2017-09-20 16:22
Author	DAH

[Data]

Number	837	Instrument: MST Radar. The transmitter powering antenna sector B was out of action for most of this period after it blew a fuse on 2012-10-06, a Saturday. This led to a raised noise floor and a slight reduction in altitude cover. LD fixed the fuse at 09:59 UT on the following Monday morning (2012-10-08). However, it blew again at 10:07 UT. LD spent the rest of the day trying to diagnose the problem and restarted the transmitter at 15:35 UT. However, the fuse blew again at 16:49 UT. LD spent much of the next day (2012-10-09) continuing to investigate the problem. The transmitter was restarted at 15:19 UT.
Start	2012-10-06 02:25
End	2012-10-09 15:19
Added	2012-10-17 08:49
Author	DAH

[Data]

Number	835	Instrument: Broadband Modem. The internet connection was lost on 2012-10-06, a Saturday, and was restored on the following Monday morning (2012-10-08), when LD power-cycled the modem.
Start	2012-10-06 13:00
End	2012-10-08 08:30
Added	2012-10-09 11:15
Author	DAH

[Data]

Number	836	Instrument: MST Radar. There is a reduction in mid-altitude ST cover during this period. It appears to have resulted from the loss of internet connection on 2012-10-06, which is known to lead to processing problems after more than 24 hours of data have accumulated. DAH manually cleared the offending files around 2012-10-08 08:30 UT, once the internet connection to the site was re-established.
Start	2012-10-07 11:30
End	2012-10-08 05:00
Added	2012-10-09 11:23
Author	DAH

[Data]

Number	838	Instrument: Beam Steering Controller. The controller sent several messages during this period to alert that phasing unit 91 (which is in antenna sector A) was first not responding and then responding again. The last message, at 15:17 UT, indicated the phasing unit was responding again.
Start	2012-10-08 10:26
End	2012-10-08 15:17
Added	2012-10-17 08:53
Author	DAH

[Data]

Number	839	Instrument: MST Radar. The transmitter powering antenna sector B blew its fuse. This led to a raised noise floor and a slight reduction ion wind-profile cover. The whole radar was powered down at 08:12 UT, to allow work to be carried out within the antenna array. LD fixed the fuse whilst this was being done and all transmitters were in operation when the radar was restarted at 15:00 UT.
Start	2012-10-16 02:03
End	2012-10-16 15:00
Added	2012-10-17 09:04
Author	DAH

[Data]

Number	840	Instrument: MST Radar. The radar was powered down to allow work to be carried out on the primary power splitter huts within the antenna array. The new huts were installed in March 2012 but, owing to the unusually wet conditions, have suffered from persistently standing in puddles of water over the past 6 months. The work was aimed at preventing further water damage.
Start	2012-10-16 08:12
End	2012-10-16 15:00
Added	2012-10-17 14:10
Author	DAH

[Data]

Number	841	Instrument: MST Radar. The radar was briefly out of action twice during this period: 13:55 - 14:29 UT, and 15:32 - 15:52 UT. The first period allowed DAH and AD to switch over from the old radar control PC "Augustus" to the new one, "Julius". Owing to the fact that NTP had not initially been configured on Julius, its clock was running 73 s behind the actual time. This was corrected during the second period of downtime.
Start	2012-10-18 13:55
End	2012-10-18 15:52
Added	2012-10-23 09:15
Author	DAH

[Data]

Number	842	Instrument: LD40 Laser Ceilometer. There are some short gaps in the data during this period as a result of the acquisition PC being rebooted.
Start	2012-10-18 14:50
End	2012-10-18 15:30
Added	2012-10-23 10:24
Author	DAH

[Data]

Number	843	Instrument: MST Radar. The radar was powered down to allow work to be carried out on the primary power splitter huts within the antenna array.
Start	2012-10-23 09:58
End	2012-10-23 11:52
Added	2012-10-24 08:28
Author	DAH

[Data]

Number	844	Instrument: MST Radar. The transmitter powering atenna sector B blew its fuse. LD made an unscheduled visit to the site in order to restart the transmitter.
Start	2012-10-24 18:44
End	2012-10-25 10:35
Added	2012-10-30 11:27
Author	DAH

[Data]

Number	846	Instrument: MST Radar. The transmitter powering antenna sector B blew its fuse. LD restarted it during a scheduled visit.
Start	2012-10-26 01:49
End	2012-10-26 12:01
Added	2012-10-30 11:41
Author	DAH

[Data]

Number	845	Instrument: MST Radar. The transmitter powering antenna sector B blew its fuse. LD made an unscheduled visit to the site in order to restart it.
Start	2012-10-28 11:53
End	2012-10-29 16:59
Added	2012-10-30 11:29
Author	DAH

[Data]

Number	1881	Instrument: MST Radar. The v4 data show unrealistically-large wind speeds within a narrow time/altitude region at around 9 km.
Start	2012-10-29 20:30
End	2012-10-29 21:20
Added	2017-09-20 15:05
Author	DAH

[Data]

Number	848	Instrument: MST Radar. The transmitter power antenna sector B blew its fuse. LD made an unscheduled visit to the site in order to restart it.
Start	2012-11-01 05:24
End	2012-11-01 14:17
Added	2012-11-02 14:47
Author	DAH

[Data]

Number	847	Instrument: UPS Units. The units switched to battery power for approximately 1 s in response to an input power problem.
Start	2012-11-01 07:24
End	2012-11-01 07:24
Added	2012-11-01 08:08
Author	DAH

[Data]

Number	849	Instrument: UPS units. Three of the units indicated a brief (~ 1 s) input power problem.
Start	2012-11-04 05:38
End	2012-11-04 05:38
Added	2012-11-05 09:24
Author	DAH

[Data]

Number	1879	Instrument: MST Radar. The v4 data show unrealistically-large wind speeds within a narrow time/altitude region at around 11 km.
Start	2012-11-05 19:40
End	2012-11-05 20:30
Added	2017-09-20 14:40
Author	DAH

[Data]

Number	850	Instrument: MST Radar. The radar was powered down in order to allow Aberystwyth University MSc students to carry out a surveying practical on the antenna array.
Start	2012-11-06 13:52
End	2012-11-06 16:01
Added	2012-11-06 16:33
Author	DAH

[Data]

Number	1880	Instrument: MST Radar. The v4 data show unrealistically-large wind speeds within a narrow time/altitude region at around 9.5 km.
Start	2012-11-10 08:30
End	2012-11-10 09:15
Added	2017-09-20 14:44
Author	DAH

[Data]

Number	851	Instrument: MST Radar. The beam controller had been sending large numbers of reports of high VSWR values on phasing unit 30 since 04:30 UT. LD suspects that this was caused by moisture getting into the power splitter unit, which had previously fallen over owing to corrosion of its support pole. The radar was stopped between 11:18 and 11:30 UT so LD can switch over the phasing units. It appears that the beam steering unit was not fully powered up when operations restarted. DAH tried to remove the spectral files for this first cycle, although it appears that the first two (for 11:30:26 and 11:30:50 UT) got through to the processing chain. This does not appear to have crashed the software. It is likely that the collected data default to vertical beam observations.
Start	2012-11-20 11:18
End	2012-11-20 11:37
Added	2012-11-20 11:55
Author	DAH

[Data]

Number	1876	Instrument: MST Radar. The v4 data show two vertically-narrow regions of unrealistically-large win speeds - one ataround 07:00 UT and 10 km and the second at around 16:00 UT and 11 km.
Start	2012-12-02 07:00
End	2012-12-02 16:30
Added	2017-09-20 14:04
Author	DAH

[Data]

Number	1877	Instrument: MST Radar. The v4 data show unrealistically-large wind speeds within a narrow time/altitude region at around 19 km.
Start	2012-12-08 17:45
End	2012-12-08 18:45
Added	2017-09-20 14:13
Author	DAH

[Data]

Number	1878	Instrument: MST Radar. The v4 data show a vertically-narrow region of unrealistically-large wind speeds at around 9.5 km.
Start	2012-12-14 04:50
End	2012-12-14 05:40
Added	2017-09-20 14:25
Author	DAH

[Data]

Number	852	Instrument: Broadband Modem. The internet connection was lost, which led to a file transfer blockage. LD solved the problem by power-cycling the modem the following day. Some data products files for 2012-12-16 were incomplete as a result of this blockage.
Start	2012-12-16 17:52
End	2012-12-17 09:41
Added	2013-01-03 09:33
Author	DAH

[Data]

Number	853	Instrument: Vaisala WXT510. The precipitation sensor failed to detect the majority of a rain event, which was seen by the tipping bucket rain gauge. This is likely to be a result of the rain falling very slowly. The laser ceilometer indicates a very low cloud base at this time.
Start	2013-01-02 07:10
End	2013-01-02 13:00
Added	2013-01-03 09:38
Author	DAH

[Data]

Number	854	Instrument: Broadband Modem. The modem lost its internet connection, which led to a backlog of file transfers. DPW power-cycled the unit whe he arrived on site. The ISP does not know the reason for this loss of connectivity.
Start	2013-01-09 00:51
End	2013-01-09 09:23
Added	2013-01-10 15:22
Author	DAH

[Data]

Number	856	Instrument: Broadband Modem. The modem lost its broadband connection early on a Saturday morning. DPW made a special visit to the site, later that day, in order to power-cycle the modem.
Start	2013-01-19 05:50
End	2013-01-19 13:10
Added	2013-01-21 09:04
Author	DAH

[Data]

Number	857	Instrument: MST Radar. The transmitter powering antenna sector B went out of action - presumably with a blown choke. This was early on a Sunday morning. LD restored the transmitter to working order, when he visited the site the following afternoon.
Start	2013-01-20 02:47
End	2013-01-21 15:55
Added	2013-01-22 14:15
Author	DAH

[Data]

Number	855	Instrument: UPS units. All units indicated a brief (~ 1 s) input power problem.
Start	2013-01-20 19:26
End	2013-01-20 19:26
Added	2013-01-21 08:44
Author	DAH

[Data]

Number	858	Instrument: UPS units. The units indicated 3 brief (~ 1 s) input power problems during this 1 minute period.
Start	2013-01-23 13:30
End	2013-01-23 13:31
Added	2013-01-23 13:54
Author	DAH

[Data]

Number	861	Instrument: Surface Wind Sensors (Frongoch). It was not possible to establish a dial-up connection with the Frongoch data logger between 2013-01-26 and 2013-01-29, exclusive. The problem appears to have been caused by a failed broadband/telephobe filter, which might have suffered damage as a result of lightning activity on 2013-01-26. Just over 10 hours' worth if data could not be recovered as a result of this issue.
Start	2013-01-26 10:00
End	2013-01-26 20:03
Added	2013-01-29 14:17
Author	DAH

[Data]

Number	859	Instrument: UPS units. The units indicted a relatively long (~ 13 s) input power problem.
Start	2013-01-26 20:59
End	2013-01-26 20:59
Added	2013-01-28 08:44
Author	DAH

[Data]

Number	860	Instrument: Broadband Modem. The modem lost its internet connection. LD made an unscheduled visit to the site, on a Sunday, in order to power-cycle the unit.
Start	2013-01-27 06:20
End	2013-01-27 15:50
Added	2013-01-28 10:23
Author	DAH

[Data]

Number	862	Instrument: UPS units. Two of the units indicated a brief (~ 1 s) input power problem.
Start	2013-01-31 06:58
End	2013-01-31 06:58
Added	2013-02-01 08:59
Author	DAH

[Data]

Number	863	Instrument: MST Radar. The radar suffered 6 brief instances (i.e. of no more than a few minutes) of internal interference during this period: at around 00:30, 04:30, 05:15, 05:45, 08:30, and 23:20 UT. The corresponding wind-profile data do not appear to have been contaminated as they were flagged as being unreliable.
Start	2013-02-15 00:30
End	2013-02-15 23:20
Added	2013-02-18 08:48
Author	DAH

[Data]

Number	864	Instrument: MST Radar. The radar suffered from a 30 minute period of internal interference. The corresponding wind-profile data were flagged as being unreliable.
Start	2013-02-17 06:55
End	2013-02-17 07:30
Added	2013-02-18 08:55
Author	DAH

[Data]

Number	866	Instrument: MST Radar. The transmitter powering antenna sector B blew its choke and so went out of action.Although LD fixed it 2 days later, at 2013-02-19 12:27 UT, it went out of action again 5 minutes later. It remained out of action until 2013-02-22. The quality of the data does not appear to have been affected by this problem. The low altitude cover is attributed to the lack of winds.
Start	2013-02-17 23:36
End	2013-02-22 10:56
Added	2013-03-04 09:51
Author	DAH

[Data]

Number	865	Instrument: Vaisala LD40 Laser Ceilometer. The instrument made no observations during this period. The error code - 00050004 - indicates "Test laser failure. Error. No more measurements possible". It began to function again without intervention. Similar problems have previously occurred during cold weather. The temperature was close to -4 degrees C when the temperature began and had risen sharply to +4 degrees C when the instrument began to function again.
Start	2013-03-03 04:30
End	2013-03-03 09:30
Added	2013-03-04 09:39
Author	DAH

[Data]

Number	868	Instrument: MST Radar. The radar was powered down to allow work to be carried out within the antenna array. The work involved the removal of Willow saplings. which had become established within the SW corner of the antenna array.
Start	2013-03-08 09:10
End	2013-03-08 17:15
Added	2013-03-11 08:22
Author	DAH

[Data]

Number	871	Instrument: MST Radar. The transmitter powering antenna sector B blew its choke and so went out of action. LD had been on site during the morning and briefly returned to the site in the afternoon in order to fix the transmitter.
Start	2013-03-15 14:31
End	2013-03-15 16:04
Added	2013-04-10 11:39
Author	DAH

[Data]

Number	869	Instrument: MST Radar. The radar experienced 7 brief episodes (< 15 minutes long) of interference during this period. This resulted in reductions in altitude cover.
Start	2013-03-28 02:00
End	2013-03-28 05:50
Added	2013-04-02 08:56
Author	DAH

[Data]

Number	870	Instrument: Vaisala LD40 Laser Ceilometer. No observations were made during this period, for which the following error message was given: "Test laser failure. Error. No more measurements possible." This problem has previously been encountered in association with low temperatures. They ranged between -3 and -5 degrees C, during the early part of this period, before rising sharply to +3 degrees C shortly after sunrise. The instrument began to operate again without the need for intervention.
Start	2013-03-30 05:00
End	2013-03-30 08:10
Added	2013-04-02 09:38
Author	DAH

[Data]

Number	872	Instrument: MST Radar. The radar suffered from a period of interference. This led to a reduction in altitude cover for the wind-profile data.
Start	2013-04-13 15:00
End	2013-04-13 17:30
Added	2013-04-15 10:01
Author	DAH

[Data]

Number	873	Instrument: MST Radar. The radar suffered two brief (~ minutes) episodes of interference.
Start	2013-04-16 02:55
End	2013-04-16 03:30
Added	2013-04-17 08:01
Author	DAH

[Data]

Number	874	Instrument: MST Radar. The beam steering controller began generating frequent messages of high VSWR values (>= 2.5; typical values are below 1.5) on the beam steering unit for quad 16 on the Saturday (2013-05-04) of the May Day Bank Holiday weekend. The radar was powered down at around 08:13 UT on the follwing Tuesday morning (2013-05-07) so that LD could swap beam steering units. The radar was restarted at 08:49 UT. This problem does not appear to have affected the radar's performance.
Start	2013-05-04 18:17
End	2013-05-07 08:49
Added	2013-05-07 10:45
Author	DAH

[Data]

Number	875	Instrument: MST Radar. The transmitter powering antenna sector B blew its choke. Although this was a Sunday, LD visited the site to fix and restart the transmitter.
Start	2013-05-05 03:06
End	2013-05-05 19:12
Added	2013-05-07 10:54
Author	DAH

[Data]

Number	878	Instrument: MST radar. The transmitter powering antenna sector B blew its fuse. LD made an unscheduled visit to the site in order to fix it.
Start	2013-05-07 14:57
End	2013-05-08 09:00
Added	2013-05-13 16:29
Author	DAH

[Data]

Number	877	Instrument: MST Radar. Three of the phasing units - numbers 23, 25, and 26 - indicated a supply voltage of 0.0 V for a single dwell. The voltage had returned to ormal (23.7 V) by the following dwell.
Start	2013-05-08 08:58
End	2013-05-08 08:59
Added	2013-05-13 16:26
Author	DAH

[Data]

Number	876	Instrument: Broadband Modem. The modem lost its connection on the morning of 2013-05-12, a Sunday. LD visited the site later in the day in order to restart it.
Start	2013-05-12 04:51
End	2013-05-12 15:00
Added	2013-05-13 16:21
Author	DAH

[Data]

Number	880	Instrument: MST Radar. The transmitter powering antenna sector C blew its fuse and was out of action for approximately 48 hours.
Start	2013-05-18 03:05
End	2013-05-20 08:59
Added	2013-05-20 16:35
Author	DAH

[Data]

Number	879	Instrument: MST Radar. The radar suffered a brief (< 1 hour) period of interference. Although the vertical velocities were affecetd (principally above 13 km), the horizontal winds do not appear to have been contaminated.
Start	2013-05-18 12:00
End	2013-05-18 12:50
Added	2013-05-20 08:06
Author	DAH

[Data]

Number	881	Instrument: MST Radar. The radar was powered down so that LD could conduct tests with a mobile-phone-activated relay unit. This is intended for power-cycling the broadband modem when it loses its internet connection. The mobile reception at the site is not good and LD thought that it would be easier to set up the unit when the MST radar was not transmitting. LD managed to get the best signal when he made use of an external antenna, albeit when it was pointing at the side of the hill. Presumably it is picking up a reflected signal.
Start	2013-05-20 14:06
End	2013-05-20 15:22
Added	2013-05-20 16:39
Author	DAH

[Data]

Number	882	Instrument: MST Radar. The beam streering unit for quad 95 began reporting high VSWR values (> 2.5) at 2013-05-22 07:51 UT. LD visited the site in the afternoon in order to switch units. He found that water had enetered the unit. This is assumed to have seeped along one of the the antenna connection cables and it is further assumed that water had worked its way into the potted unit on the dipole for that particular antenna. LD connected a dummy load in place of that antenna.
Start	2013-05-22 13:59
End	2013-05-22 14:56
Added	2013-05-22 16:17
Author	DAH

[Data]

Number	883	Instrument: Broadband Modem. The modem lost its internet connection, which prevented any file transfers from taking place. DAH was successfully able to remotely power-cycle the modem using a mobile-phone-based switch. LD had only managed to get the unit to work a couple of days earlier (the radar site is in an area of poor mobile reception) and this is the first time that it has been used operationally.
Start	2013-05-23 22:12
End	2013-05-24 07:05
Added	2013-05-24 08:50
Author	DAH

[Data]

Number	884	Instrument: MST Radar. The supply voltage for beam steering unit 14 began flipping between its expected value of around 24 V and low values of around 0.3 V at 2013-05-25 17:39 UT. The controller was sending alert messages approximately every minute. LD visited the site on 2013-05-26 (a Sunday) in order to switch the affected unit. Rather than stopping the radar control software, he put all of the transmitters into a standby state 11:11 - 11:23 UT. However, he accidentally switched over unit 4 rather than 14. Since the error messages continued, he repeated the procedure 12:04 - 12:22.
Start	2013-05-25 17:39
End	2013-05-28 09:48
Added	2013-05-28 10:26
Author	DAH

[Data]

Number	886	Instrument: Vaisala WXT510. The software that creates the netCDF files from the raw data logs is hanging when run for this day. This appears to be the result of a short data gap.
Start	2013-05-26 00:00
End	2013-05-26 23:59
Added	2013-05-28 15:35
Author	DAH

[Data]

Number	885	Instrument: MST Radar. There are two gaps in data, 11:11 - 11:23 and 12:04 - 12:22 UT, resulting from LD switching the transmitters into standy mode. This allowed him to switch beam steering unit 14, which was showing errors.
Start	2013-05-26 11:11
End	2013-05-26 12:22
Added	2013-05-28 10:28
Author	DAH

[Data]

Number	1874	Instrument: MST Radar. Using v4 processing, there are two regions of enhanced horizontal wind speed, just above the jet, that appear to be caused by "cross-talk" from the vertical velocity mountain wave activity. They do not look realistic.
Start	2013-05-30 10:30
End	2013-05-30 16:30
Added	2017-09-19 15:37
Author	DAH

[Data]

Number	887	Instrument: Broadband modem. The modem lost its connection leading to a backlog in file transfers. DAH remotely-power-cycled the modem when he spotted the problem the next day (a Saturday).
Start	2013-05-31 22:50
End	2013-06-01 10:50
Added	2013-06-01 12:03
Author	DAH

[Data]

Number	888	Instrument: UPS units. The UPS units indicated a brief (~ 1 s) input power problem.
Start	2013-06-01 21:59
End	2013-06-01 21:59
Added	2013-06-03 09:55
Author	DAH

[Data]

Number	889	Instrument: MST Radar. The transmitter powering antenna sector B shut down. LD restarted it when he was on site the following day.
Start	2013-06-03 16:26
End	2013-06-04 09:43
Added	2013-06-17 16:23
Author	DAH

[Data]

Number	890	Instrumeht: MST Radar. The transmitter powering antenna sector B shut down.. LD restarted it the folllowing day.
Start	2013-06-04 17:13
End	2013-06-05 14:14
Added	2013-06-17 16:24
Author	DAH

[Data]

Number	891	Instrument: MST Radar. The transmitter powering antenna sector B shut down. LD restarted it the following day. He also changed the gain settings on the transmitter's internal measurement amplifiers in order to prevent it from auto-shutting-down.
Start	2013-06-05 17:03
End	2013-06-06 16:19
Added	2013-06-17 16:27
Author	DAH

[Data]

Number	892	Instrument: UPS Units. Two of the units indicated a brief (~ 1 s) input power problem.
Start	2013-06-16 06:38
End	2013-06-16 06:38
Added	2013-06-17 16:30
Author	DAH

[Data]

Number	1873	Instrument: MST Radar. The wind speeds from the v4 processing above 15 km during this period are faster than at neighboring times suggesting some contamination by interference.
Start	2013-06-16 15:10
End	2013-06-16 16:50
Added	2017-09-19 12:17
Author	DAH

[Data]

Number	893	Instrument: MST Radar. The radar suffered a problem that resulted in a brief loss of useful wind coverage at around 15:00 UT. The "secondary radial chain exists" diagnostic parameter suggests that an underlying problem occurred between 14:00 and 15:30 UT.
Start	2013-06-19 14:00
End	2013-06-19 15:30
Added	2013-06-20 08:25
Author	DAH

[Data]

Number	898	Instrument: MST Radar. LD raised the power setting on the transmitter powering antenna sector E from level 3 to 4, out of 5.
Start	2013-06-28 10:10
End	2013-06-28 10:27
Added	2013-07-12 11:33
Author	DAH

[Data]

Number	894	Instrument: MST Radar. The transmitter powering antenna sector C blew uts fuse. LD made an unscheduled visit to the site in order to repair it. He also adjusted the fional heater voltage setting.
Start	2013-06-30 07:32
End	2013-07-01 09:38
Added	2013-07-01 15:06
Author	DAH

[Data]

Number	899	Instrument: MST Radar. During this 90 minute period, LD carried out work on several of the transmitters - increasing the power settings from level 3 to level 4 on the transmitter for antenna sector C at around 10:21 UT and for antenna sector A at around 11:07 UT. After retuning the transmitters, the one for sector A tripped on 3 occasions: 10:47 - 11:07, 11:12 - 11:20, and 11:25 - 11:41 UT. The one for antenna sector C tripped on 2 occasions: 11:01 - 11:20, and 11:41 - 11:48 UT.
Start	2013-07-02 10:14
End	2013-07-12 11:48
Added	2013-07-12 15:25
Author	DAH

[Data]

Number	895	Instrument: Broadband Modem. The supplementary website - http://www.mstrf.eclipse.co.uk/ - was not being updated during this overnight period. When DAH spotted this first thing on the following morning (07:20 UT), he assumed that the modem had lost its internet connection and initiated a remote reboot. However, it soon became clear that it was only the website that had been affected and not the broadband connection. It turns out that the problem was caused by the ISP carrying out maintenance on their ftp server.
Start	2013-07-04 20:20
End	2013-07-05 08:11
Added	2013-07-05 09:51
Author	DAH

[Data]

Number	900	Instrument: MST Radar. Two of the transmitters were out of action during some of this period. The one powering antenna sector A was down on 3 occasions: 09:21 - 09:30, 09:34 - 09:58, and 10:04 - 10:14 UT. The one powering antenna sector D was down on 2 occasions: 09:22 - 09:31, and 09:35 - 09:58 UT.
Start	2013-07-09 09:21
End	2013-07-09 10:14
Added	2013-07-12 16:27
Author	DAH

[Data]

Number	896	Instrument: MST Radar. The transmitter powering antenna sector B shut down with an analogue parameter error. LD made an unscheduled visit to the site in order to restart it.
Start	2013-07-09 17:31
End	2013-07-10 08:58
Added	2013-07-10 10:29
Author	DAH

[Data]

Number	901	Instrument: MST Radar. The transmitter powering antenna sector was down on occasions: 17:31 UT on the 9th- 08:58 UT the following day; 09:51 - 14:00, 14:07 - 14:22 UT on the 10th; 14:50 on 10th - 11:19 on 11th; 11:25 on 11th - 09:07 on 12th; 11:16 - 11:48 on 12th.
Start	2013-07-09 17:31
End	2013-07-12 16:27
Added	2013-07-12 16:36
Author	DAH

[Data]

Number	897	Instrument: MST Radar. The radar suffered from a brief period of interference. This caused obvious contamination of the vertical beam data - particularly in the altitude range 15 - 20 km - and some contamination of the horizontal wind data, albeit in a more-restricted way.
Start	2013-07-11 13:00
End	2013-07-11 13:50
Added	2013-07-12 10:27
Author	DAH

[Data]

Number	902	Instrument: Broadband Modem. The modem lost its internet connection overnight, which led to a blockage of file transfers. DAH remotely power-cycled the unit as soon as he spotted the problem the following morning. Owing to unconnected networking issues at RAL, it was an hour after he arrived in the office before he noticed that there was a problem.
Start	2013-07-14 21:51
End	2013-07-15 08:00
Added	2013-07-15 10:01
Author	DAH

[Data]

Number	903	Instrument: MST Radar. The transmitter powering antenna sector B shut down with an analogue error. LD was confused about this as he had altered the measurement circuits so that all of the readings were comfortably within their acceptable ranges. However, some drift had subsequently occurred.
Start	2013-07-18 19:14
End	2013-07-19 08:50
Added	2013-07-19 14:36
Author	DAH

[Data]

Number	904	Instrument: MST Radar. The transmitter powering antenna sector B shut down with error code 7: "Analog parameter error at State 4". DAH was able to remotely restart the transmitter as soon as he spotted the problem on the Monday morning. It went down on a Friday afternoon. LD only switched the RS232 connection to the transmitter back to the main radar control and data acqusition PC on the Friday. For some time previously it had been connected to a separate monitoring PC, which did not allow remote restarts to be carried out.
Start	2013-07-19 16:36
End	2013-07-22 08:17
Added	2013-07-22 09:34
Author	DAH

[Data]

Number	905	Instrument: MST Radar. The transmitter powering antenna sector C was out of action for most of this period after blowing its choke. Despite the fact it went down on a Saturday, LD visited site the following day (2013-07-28) to fix it. However, it was only up for half an hour (17:49 - 18:18 UT) before it blew its choke again. LD made another visit to site on the following day (2013-07-29), but it only operated for half an hour, 09:52 - 10:20 UT, before blwoing its choke again. LD worked on it for much of 2013-07-30 before returning it to working order.
Start	2013-07-27 11:46
End	2013-07-30 15:59
Added	2013-07-30 16:40
Author	DAH

[Data]

Number	907	Instrument: MST Radar. Beam steering unit 30 began to operate intermittently at 2013-07-29 07:35 UT. The beam steering controller indicated that it was alternately not-responding and then responding again. The radar was stopped for this 20 minute period on 2013-07-30 to allow LD to switch it with a spare unit. There was no obvious sign that it had suffered from recent rains.
Start	2013-07-30 13:59
End	2013-07-30 14:22
Added	2013-07-31 10:06
Author	DAH

[Data]

Number	906	Instrument: UPS units. Three of the six UPS uints reported a brief (~ 1 s) input power problem that required them to switch to battery power.
Start	2013-07-31 03:47
End	2013-07-31 03:47
Added	2013-07-31 09:38
Author	DAH

[Data]

Number	908	Instrument: MST Radar. Two transmitters were out of action, with blown chokes, for most of this period. The transmitter powering antenna sector B went down at 00:14 UT (on 2013-08-01) and the one for sector C at 05:46 UT on the same day. LD repaired them both the following morning. The transmitter for sector B continued to be problematic for the rest of this second day.
Start	2013-08-01 00:14
End	2013-08-02 08:45
Added	2013-08-08 08:47
Author	DAH

[Data]

Number	909	Instrument: MST Radar. The transmitter powering antenna sector B was out of action for most of this period owing to the fact that it repeatedly blew its choke. The transmitter was functioning 11:59 - 13:09 UT and 16: 22 - 16:23 UT on 2013-08-02, and 11:52 - 12:25 UT on 2013-08-06.
Start	2013-08-02 11:25
End	2013-08-06 14:39
Added	2013-08-08 09:28
Author	DAH

[Data]

Number	910	Instrument: MST Radar. The transmitter powering antenna sector C was out of action, with a blown choke, for the whole of this period. The transmitter powering antenna sector B was out of action, also with a blown choke, for most of this period, having gone down at 04:41 UT. Both transmitters were restarted at the same time when LD repaired them.
Start	2013-08-13 04:04
End	2013-08-13 10:05
Added	2013-08-14 09:25
Author	DAH

[Data]

Number	913	Instrument: Vaisala WXT510 Surface met and wind sensors. The netcdf file for this day could not be created. A longer than expected gap in the raw data log caused the file creation software to crash.
Start	2013-08-20 00:00
End	2013-08-20 23:59
Added	2013-08-29 08:51
Author	DAH

[Data]

Number	914	Instrument: Vaisala WXT510 Surface met and wind sensors. The netcdf file for this day could not be created. A longer than expected gap in the raw data log caused the file creation software to crash.
Start	2013-08-23 00:00
End	2013-08-23 23:59
Added	2013-08-29 08:51
Author	DAH

[Data]

Number	911	Instrument: MST Radar. The radar suffered from interference during this time - principally between 12:00 and 12:40 UT. Although this did not appear to have caused any contamination of the v3 wind data, it is clear from the v4 Cardinal data that some contamination occurred.
Start	2013-08-26 11:50
End	2013-08-26 14:30
Added	2013-08-28 09:46
Author	DAH

[Data]

Number	915	Instrument: MST Radar. The transmitter powering antenna sector B was out of action for this period, when LD was on leave. DAH assumed that the transmitter had blown its choke and so did nothing about it. However, it turns out that it had simply shut down with an analogue error and so could have been restarted remotely. The performance of the radar was not significantly affected by this issue.
Start	2013-08-26 17:29
End	2013-09-03 08:42
Added	2013-09-03 10:13
Author	DAH

[Data]

Number	916	Instrument: MST Radar. The beam steering unit for node 24 indicated that it updated its software during this period. A message of this type has not been seen before.
Start	2013-08-28 04:57
End	2013-08-28 04:58
Added	2013-09-03 10:19
Author	DAH

[Data]

Number	912	Instrument: MST Radar. The radar experienced a brief period of interference. This does not appear to have caused any contamination of the horizontal wind data, although there is a limted region of contaminated vertical velocity data at altitudes above 17 km.
Start	2013-08-28 14:45
End	2013-08-28 15:45
Added	2013-08-29 08:35
Author	DAH

[Data]

Number	921	Instrument: MST Radar. The transmitter powering antenna sector B was out of action with a blown fuse.
Start	2013-09-03 19:37
End	2013-09-04 14:02
Added	2013-09-20 10:10
Author	DAH

[Data]

Number	917	Instrument: MST Radar. The radar appears to have suffered from interference on at least one of its off-vertical beams. This resulted in a reduction in altitude cover by several km. The quality of the wind-profile data does not otherwise appear to have been affected.
Start	2013-09-03 19:45
End	2013-09-04 01:00
Added	2013-09-05 08:46
Author	DAH

[Data]

Number	922	Instrument: Campbell Sci. Tipping Bucket Raingauge. LD cleaned out the raingauge on the morning of 2013-09-06. Unfortunately he re-assembled it with the inlet pointing in the wrong direction. This meant that it failed to detect the rain that fell every day 6th - 12th September, inclusive. These venets were detected by the Vaisala WXT510. Both instruments detected the rain that fell during the evening of the 13th.
Start	2013-09-06 00:00
End	2013-09-13 09:00
Added	2013-09-20 10:35
Author	DAH

[Data]

Number	919	Instrument: Vaisala WXT510. A small gap in the raw data caused the the netCDF file creation program to crash. Although the data are not lost, netCDF files will not be created until the file creation software can be updated.
Start	2013-09-19 00:00
End	2013-09-19 23:59
Added	2013-09-20 09:32
Author	DAH

[Data]

Number	920	Instrument: MST Radar. The transmitter powering antenna sector C was out of action with a blown fuse. This did not cause a significant change in useful altitude cover for wind-profiling purposes.
Start	2013-09-19 10:16
End	2013-09-20 08:33
Added	2013-09-20 10:06
Author	DAH

[Data]

Number	918	Instrument: Broadband Modem. The modem lost its broadband connection overnight leading to a backlog of file transfers. DAH spotted the problem first thing on the following morning and remotely power-cycled the modem.
Start	2013-09-19 22:51
End	2013-09-20 07:05
Added	2013-09-20 08:32
Author	DAH

[Data]

Number	925	Instrument: MST Radar. The transmitter powering antenna sector B was out of action for most of this period. owing to a blown choke It was briefly back in action 09:53 - 10:04, 10:36 - 12:40, and 16:52 - 16:58 UT on 2013-09-24, but blew its choke again on each occasion. It was restarted reliably on the following day. LD had taken the opportunity before the first restart on 2013-09-24 to change the capacitors coupling the output circuit of the PA.
Start	2013-09-23 14:49
End	2013-09-25 15:26
Added	2013-09-30 12:21
Author	DAH

[Data]

Number	928	Instrument: MST Radar. Beam steering unit number 74 gave an unknown response to the controller at this time. However, the error message has not been repeated and no intervention has been taken.
Start	2013-09-27 06:13
End	2013-09-27 06:13
Added	2013-10-07 15:12
Author	DAH

[Data]

Number	924	Instrument: Vaisala LD40 Laser Ceilometer. The mains electricity problem that occurred at 2013-09-28 06:20 UT appears to have caused the time stamp of ceilometer messages to jump by +4 hours. DAH modified the NASA Ames file creation software to compensate for this and recreated the file for 2013-09-29. The file for 2013-09-28 contains a time discontinuity and will need to be removed from the BADC file store.
Start	2013-09-28 00:00
End	2013-09-29 23:59
Added	2013-09-30 11:53
Author	DAH

[Data]

Number	923	Instrument: UPS Units. The units switched to battery power in response to two brief input power problems. The first occurred at 05:59 UT and lasted for 1 s. The second occurred at 06:20 UT and lasted for 20 s.
Start	2013-09-28 05:59
End	2013-09-28 06:21
Added	2013-09-30 08:36
Author	DAH

[Data]

Number	926	Instrument: Sky-Camera. The camera, which was not powered through a UPS unit, stopped working at the time of a 20 s mains power disruption. It is suspected that its power supply unit has failed. The instrument will remain out of action until replacement parts can be installed.
Start	2013-09-28 06:20
End	2013-09-28 06:20
Added	2013-10-07 14:21
Author	DAH

[Data]

Number	927	Vaisala WXT510. A small gap in the raw data caused the the netCDF file creation program to crash. Although the data are not lost, netCDF files for 3rd and 4th of October 2013 will not be created until the file creation software can be updated.
Start	2013-10-03 00:00
End	2013-10-04 23:59
Added	2013-10-07 15:06
Author	DAH

[Data]

Number	929	Instrument: Vaisala WXT510. This instrument did not detect the precipitation event that the tipping bucket rain gauge detected during this period. However, both instruments detected a precipitatio event the following day without any intervention having been taken.
Start	2013-10-08 01:20
End	2013-10-08 07:10
Added	2013-10-10 09:38
Author	DAH

[Data]

Number	932	Instrument: MST Radar. There was an unexplained gap in observations during this period. The first two dwells of the cycle beginning at 14:14:36 UT were made as normal, but there was then a 16 minute gap before the third dwell began. The beam steering controller indicated sub-normal transmitter powers at 14:23 UT, although there was likely to have been a delay before this was detected. It indicated a return to normal powers at 14:31 UT. The log files do not suggest that the beam steering unit was responsible for this issue.
Start	2013-10-12 14:15
End	2013-10-12 14:31
Added	2013-10-14 12:16
Author	DAH

[Data]

Number	930	Instrument: Broadband Modem. The modem lost its internet connection leading to a delay in file transfers. DAH power-cycled the modem remotely. However, it lost its connection again an hour later.
Start	2013-10-13 00:51
End	2013-10-13 11:00
Added	2013-10-14 08:28
Author	DAH

[Data]

Number	931	Instrument: Broadband Modem. The modem lost its internet connection again only an hour after it had been restarted. DAH once again power-cyles it remotely.
Start	2013-10-13 11:51
End	2013-10-13 13:00
Added	2013-10-14 08:37
Author	DAH

[Data]

Number	933	Instrument: MST Radar. Beam steering unit number 94 updated its software at this time. The reason for it doing this is unknown.
Start	2013-10-13 19:42
End	2013-10-13 19:42
Added	2013-10-14 16:36
Author	DAH

[Data]

Number	934	Instrument: Broadband Modem. There was no internet connection to the site during most of this period. The source of the problem appears to have been at an exchange in Birmingham and so was not specific to the ISP or the Aberystwyth area. LD had visited the site and tried to power-cycle the modem a couple of times in an attempt to clear the problem. A connection was established for some time. DAH spotted the fact that the quick-look plots were not being updated later in the afternoon and remotely power-cycled the modem. The underlying problem must have been sorted by then as no more interruptions were encountered.
Start	2013-10-16 12:53
End	2013-10-16 16:50
Added	2013-10-18 14:46
Author	DAH

[Data]

Number	935	Instrument: MST Radar. The transmitter powering antenna sector B blew its fuse. LD was on site later the same morning and fixed it.
Start	2013-10-18 06:36
End	2013-10-18 09:27
Added	2013-10-18 14:48
Author	DAH

[Data]

Number	936	Instrument: MST Radar. The beam steering unit for quad 67 began reporting high values of VSWR (> 2.5) at 07:55 UT on 2013-10-22. The radar was stopped between 10:22 and 10:38 to allow LD to switch beam steering units. However, since this did not immediately improve the readings, the radar was stopped again between 10:43 and 10:52 UT. Thereafter the readings jumped to 9.0. The radar was stopped again in the afternoon, 13:38 - 14:36 UT, to allow LD to investigate further, although he could not find any obvious problems. The performance of the radar does not appear to be significantly affected by this issue.
Start	2013-10-22 10:22
End	2013-10-22 14:36
Added	2013-10-23 09:19
Author	DAH

[Data]

Number	937	Instrument: MST Radar. The radar was stopped briefly to alllow LD to switch beam steering unit 67 for a fresh device (following up o the previous day's activities). This resulted in the VSWR value dropping down to 1.6, which is within the expected range. LD had earlier (08:36 - 08:44 UT) put the transmitter for the relevant antenna sector (D) out of action so that he could visually inspect the beam steering unit.
Start	2013-10-23 09:10
End	2013-10-23 09:22
Added	2013-10-23 11:50
Author	DAH

[Data]

Number	939	Instrument: MST Radar. The transmitter powering antenna sector B was out of action with a blown choke.
Start	2013-10-25 15:59
End	2013-10-29 10:34
Added	2013-11-04 10:10
Author	DAH

[Data]

Number	940	Instrument: MST Radar. The transmitter powering antenna sector B was out of action with a blown choke.
Start	2013-10-29 23:18
End	2013-11-01 12:35
Added	2013-11-04 10:11
Author	DAH

[Data]

Number	938	Instrument: UPS units, Vaisala WXT510, Vaisala. There was an unusually long period (9 minutes) during which the UPS units were on battery power in response to an input power problem. It is assumed that there was a black out. This affected the Vaisala WXT510 and Vaisala LD40 instruments, which do not appear to be powered by a UPS unit. There are data gaps for both during this period.
Start	2013-11-02 13:14
End	2013-11-02 13:23
Added	2013-11-04 09:04
Author	DAH

[Data]

Number	941	Instrument: MST Radar. The beam steering controller indicated that the forward power levels for 3 of the transmitters (those powering antenna sectors A, B, and E) was low for a single dwell.
Start	2013-11-04 22:34
End	2013-11-04 22:34
Added	2013-11-05 09:52
Author	DAH

[Data]

Number	942	Instrument: MST Radar. The radar was powered down whilst Aberystwyth University students carried out a surveying practical on the antenna array.
Start	2013-11-05 09:47
End	2013-11-05 11:47
Added	2013-11-05 13:50
Author	DAH

[Data]

Number	943	Instrument: Vaisala LD40 Ceilometer. There was a short gap in data acquisition whilst LD transferred the instrument to a UPS unit. The fact that it was not already powered this way came to light during the recent power cut.
Start	2013-11-05 11:31
End	2013-11-05 11:42
Added	2013-11-07 08:50
Author	DAH

[Data]

Number	944	Instrument: MST Radar. The radar suffered from interference, which led to a reduction in the useful altitude coverage.
Start	2013-11-11 08:50
End	2013-11-11 10:40
Added	2013-11-11 16:20
Author	DAH

[Data]

Number	946	Instrument: MST Radar. The radar suffered intermittently from a raised noise floor during this period. This led to corresponding reductions in useful altitude coverage. At first it was thought that the radar was suffering from receiver interference, which usually passes off without any intervention having to be taken. However, when the problem persisted, suspicion turned to the transmitters. A similar problem used to be seen when the transmitter powering antenna sector A shut down with an analogue error. Consequently, LD took out of action first the transmitter for sector A (09:38 - 15:48 UT on 2013-11-14) and then the transmitter for sector B (15:48 - 17:00 UT on 2013-11-14). Neither action had any effect. The radar was stopped briefly (09:39 - 09:58 UT on 2013-11-15) on the following day. Transmitter A was out of action 11:07 - 12:26 UT and transmitter B 12:05 - 15:50 UT. Finally, LD disconnected the receiver feed for transmitter E (but left the transmitter connected) and this solved the problem.
Start	2013-11-12 03:30
End	2013-11-15 16:30
Added	2013-11-22 09:23
Author	DAH

[Data]

Number	945	Instrument: MST Radar. Beam steering unit 95 failed to respond during 3 intervals of this period: 02:44 - 03:44, 04:41 - 04:50, and 06:16 - 07:14. It started to repond again without any intervention being taken.
Start	2013-11-13 02:44
End	2013-11-13 07:14
Added	2013-11-15 12:24
Author	DAH

[Data]

Number	947	Instrument: MST Radar. The beam steering unit indicated that the output power for transmitter A was low during two brief periods: 02:49 - 02:51 UT and 03:01 - 03:04.
Start	2013-11-18 02:49
End	2013-11-18 03:04
Added	2013-11-22 09:25
Author	DAH

[Data]

Number	948	Instrument: Vaisala WXT510 surface met and wind sensors. A known bug in the netCDF file creation software prevented the file being created for the day owing to a short gap in the raw data.
Start	2013-11-29 00:00
End	2013-11-29 23:59
Added	2013-12-02 09:05
Author	DAH

[Data]

Number	949	Instrument: MST Radar. The radar was stopped to allow a dipole to be changed on one of the Yagis.
Start	2013-12-04 15:30
End	2013-12-04 16:21
Added	2013-12-09 09:02
Author	DAH

[Data]

Number	951	Instrument: Vaisala WXT510. A known bug in the netCDF file creation software prevented the file being created for the day owing to a short gap in the raw data.
Start	2013-12-05 00:00
End	2013-12-05 23:59
Added	2013-12-09 10:19
Author	DAH

[Data]

Number	961	Instrument: MST Radar. The transmitter for antenna sector E was powered down so that one of the Yagi dipoles could be swapped.
Start	2013-12-05 11:24
End	2013-12-05 11:57
Added	2014-01-09 09:25
Author	DAH

[Data]

Number	962	Instrument: MST Radar. The transmitter for antenna sector E was powered down so that one of the Yagi dipoles could be swapped.
Start	2013-12-05 12:48
End	2013-12-05 13:07
Added	2014-01-09 09:26
Author	DAH

[Data]

Number	950	Instrument: Vaisala WXT510. A known bug in the netCDF file creation software prevented the files being created for these days owing to short gaps in the raw data.
Start	2013-12-07 00:00
End	2013-12-08 23:59
Added	2013-12-09 10:19
Author	DAH

[Data]

Number	963	Instrument: MST Radar. The transmitter for antenna sector E was powered do so that LD could investigate a raised noise floor issue. He replaced all of the PIN diodes (although they tested OK) and re-soldered a capacitor on the receiver RF side. This may have come loose when he was working on the diodes.
Start	2013-12-10 09:54
End	2013-12-10 14:24
Added	2014-01-09 11:18
Author	DAH

[Data]

Number	952	Instrument: Vaisala WXT510. A known bug in the netCDF file creation software prevented the file being created for the day owing to a short gap in the raw data.
Start	2013-12-13 00:00
End	2013-12-13 23:59
Added	2013-12-16 10:36
Author	DAH

[Data]

Number	953	Instrument: Vaisala WXT510. A known bug in the netCDF file creation software prevented the file being created for the day owing to a short gap in the raw data.
Start	2013-12-13 00:00
End	2013-12-13 23:59
Added	2013-12-17 08:33
Author	DAH

[Data]

Number	954	Instrument: Vaisala WXT510. A known bug in the netCDF file creation software prevented the file being created for the day owing to a short gap in the raw data.
Start	2013-12-16 00:00
End	2013-12-16 23:59
Added	2013-12-17 08:38
Author	DAH

[Data]

Number	964	Instrument: UPS Units. The units switched to battery power in response to a brief (~ 1s) input power problem.
Start	2013-12-22 12:36
End	2013-12-22 12:36
Added	2014-01-09 11:27
Author	DAH

[Data]

Number	967	Instrument: MST Radar. The transmitter for antenna sector B was out of action with a blown fuse. LD visited the site in order to fix it.
Start	2013-12-25 12:38
End	2013-12-28 15:37
Added	2014-01-13 14:50
Author	DAH

[Data]

Number	965	Instrument: UPS Units. The units switched to battery power in response to a brief (~ 1s) input power problem.
Start	2013-12-26 21:02
End	2013-12-26 21:02
Added	2014-01-09 11:32
Author	DAH

[Data]

Number	960	Instrument: Broadband modem. There was no internet connection to the site during most of this period. DAH first spotted the break just a few hours into the period and remotely power-cycled the modem at 2013-12-28 09:50. Although the quick-look plots appear to have been updating for the next 3 days, the spectral files were not being transferred up to RAL. The quick-look plots stopped updating at 2013-12-31 18:41. DAH did not spot the problem until 11:08 the following day. However, it took him 3 attempts at remotely power-cycling the modem before he could re-establish a connection. Connectivity did not last for long and despite numerous attempts that day and the next, he only re-established it briefly on a few occasions. The ISP was closed on New Year's Day and so DAH had to wait until 2014-01-02 before speaking to them. LD came to the site that morning and established that the "fax" line (used for the broadband connection) was very noisy. He switched the modem to the Manchester University "phone" line for a while (this was primarily to allow the backlog of Met Office messages to upload). However, under instructions from the ISP he reconnected the modem to the "fax" line in case Open Reach began line testing the following morning. The ISP changed their advice the following day (Friday 2014-01-03) since it had now been established that the problem was classified as a phone line fault and not a broadband one. Apparently an Open Reach engineer attempted to visit the site at around 10:00 on Sunday 2014-01-05, but obviously found no-one there. They are now scheduled to return on the afternoon of 2014-01-09. The University of Manchester line continues to be used in the meantime.
Start	2013-12-28 04:31
End	2014-01-03 12:00
Added	2014-01-07 16:39
Author	DAH

[Data]

Number	956	Instrument: MST Radar. Data are unavailable for this period since some of the spectral files were causing the signal processing software to crash. LD spotted from the quick-look plots that something was wrong at around 16:00 and was on site at around 17:00. He was surprised to find that the radar was apparently working and called DAH, who had not yet spotted the gap in data. DAH quickly established the immediate (rather than the underlying) cause of the problem and removed the spectral files for the period 14:15 - 15:21. He subsequently established that the gap between dwells (which is normally around 25 s) suddenly increased to over 7 minutes after the 3rd dwell of the cycle. There was a gap of over 20 minutes after the 5th dwell. There is no indication as to what might have caused this problem. The logs seem to rule out a communications failure with the beam steering unit. They do, however, show that the forward power was low for antenna sectors B and E 14:20 - 14:23 UT, and for sectors A, B, and C 14:28 - 14:53 UT.
Start	2013-12-30 14:15
End	2013-12-30 15:21
Added	2014-01-07 11:42
Author	DAH

[Data]

Number	957	Instrument: Vaisala WXT510. Raw data stopped being recorded in the log at 2013-12-30 14:35. This was presumably as a result of the unexpalined MST radar problem, which began to manifest itself at 14:15. The same PC, "julius", is used for controlling the radar and acquiring WXT510 data. Owing to internet problems, which began around the same time, DAH did not spot this problem until 2014-01-06. He solved it by killing of the existing process and restarting it.
Start	2013-12-30 14:35
End	2014-01-06 10:30
Added	2014-01-07 12:23
Author	DAH

[Data]

Number	955	Instrument: UPS units. The units switched to battery power for ~1 s i response to an input power problem.
Start	2014-01-03 19:32
End	2014-01-03 19:32
Added	2014-01-06 11:46
Author	DAH

[Data]

Number	966	Instrument: MST Radar. The beam steering controller indicated that the forward power was low of antenna sectors A, B, and C for one dwell.
Start	2014-01-05 05:21
End	2014-01-05 05:21
Added	2014-01-09 14:53
Author	DAH

[Data]

Number	958	Instrument: MST Radar. The transmitter powering antenna sector A shut down with error code 7: "Analogue Parameter Error at State 4". DAH was able to clear the error and to restart the transmitter remotely.
Start	2014-01-07 14:29
End	2014-01-07 14:42
Added	2014-01-07 15:05
Author	DAH

[Data]

Number	959	Instrument: MST Radar. The transmitter powering antenna sector A shut down with error code 7: "Analogue Parameter Error at State 4". DAH was able to clear the error and to restart the transmitter remotely at 15:26. However, the same problem recurred 7 more times during this period, primarily within the first 20 minutes. The transmitter remained out of action between 2014-01-07 16:38 and 2014-01-09 13:22, when LD restarted it.
Start	2014-01-07 15:21
End	2014-01-07 16:17
Added	2014-01-07 16:20
Author	DAH

[Data]

Number	968	Instrument: MST Radar. The beam steering controller indicated that units 41, 42, 51, and 52 were not responding during this period.
Start	2014-01-09 14:25
End	2014-01-09 14:36
Added	2014-01-13 15:02
Author	DAH

[Data]

Number	969	Instrument: MST Radar. The beam steering controller indicated that unit 95 alterated between not responding and responding on 9 occasions during this period. The problem went away without any intervention being taken.
Start	2014-01-12 18:05
End	2014-01-12 22:53
Added	2014-01-13 15:07
Author	DAH

[Data]

Number	970	Instrument: Vaisala WXT510. A known bug in the netCDF file creation software prevented the file being created for 2014-01-13 and 2014-01-14 owing to short gaps in the raw data.
Start	2014-01-13 00:00
End	2014-01-14 23:59
Added	2014-01-14 08:43
Author	DAH

[Data]

Number	971	Instrument: Vaisala WXT510. A known bug in the netCDF file creation software prevented the file being created for the day owing to a short gap in the raw data.
Start	2014-01-16 00:00
End	2014-01-16 23:59
Added	2014-01-17 08:43
Author	DAH

[Data]

Number	972	Instrument: Vaisala WXT510. A known bug in the netCDF file creation software prevented the file being created for 2014-01-17, 2014-01-18, and 2014-01-19 owing to short gaps in the raw data.
Start	2014-01-17 00:00
End	2014-01-19 23:59
Added	2014-01-20 08:53
Author	DAH

[Data]

Number	973	Instrument: MST Radar. The transmitter powering antenna sector E was briefly taken out of line to allow LD to investigate an outstanding raised noise floor issue.
Start	2014-01-17 10:27
End	2014-01-17 10:31
Added	2014-01-20 14:18
Author	DAH

[Data]

Number	976	Instrument: Vaisala WXT510. A known bug in the netCDF file creation software prevented the file being created for 2014-01-21 and 2014-01-22 owing to short gaps in the raw data.
Start	2014-01-21 00:00
End	2014-01-22 23:59
Added	2014-01-23 08:42
Author	DAH

[Data]

Number	974	Instrument: MST Radar. The beam steering controller indicated that unit 95 did not respond for this 15+ minute period. It began to respond again without any intervention having been taken.
Start	2014-01-21 03:18
End	2014-01-21 03:34
Added	2014-01-21 09:47
Author	DAH

[Data]

Number	975	Instrument: MST Radar. The radar was stopped for 15 minutes so that LD could swap beamsteering unit 95, which had been unresponsive on a few recent occasions.
Start	2014-01-21 10:06
End	2014-01-21 10:23
Added	2014-01-21 16:08
Author	DAH

[Data]

Number	980	Instrument: Vaisala WXT510. A known bug in the netCDF file creation software prevented the file being created owing to gaps in the raw data.
Start	2014-01-24 00:00
End	2014-01-24 23:59
Added	2014-01-28 13:52
Author	DAH

[Data]

Number	977	Instrument: MST Radar. The radar control PC (julius) became unresponsive for a short while around 14:28 UT. LD spotted that all 5 transmitters were showing low power and so phoned DAH, who suspected that they were seeing a similar problem to that seen on 2013-12-30. Consequently DAH was able to remove the spectral files for this period from the data stream and so prevented them from crashing the signl processing software. The underlying cause of the problem is not known.
Start	2014-01-24 14:09
End	2014-01-24 14:47
Added	2014-01-24 16:29
Author	DAH

[Data]

Number	978	Instrument: UPS units. The units switched to battery power for a relatively long time (~ 18 s) in repsonse to an input power problem.
Start	2014-01-24 16:39
End	2014-01-24 16:39
Added	2014-01-28 11:35
Author	DAH

[Data]

Number	979	Instrument: Broadband Modem. The modem lost its internet connection at some time shortly after (Saturday) 2014/01/25 13:41. DAH did not spot this until 17:40 and was unable to re-establish the connection by remotely power-cycling the modem. LD visited the site on the following day and was only able to re-establish a connection by switching to the backup modem. It seems likely that the original modem was damaged in connection with a nearby lightning strike. A deep convective system was passing over the radar site when the connection was first lost.
Start	2014-01-25 13:41
End	2014-01-26 11:40
Added	2014-01-28 12:04
Author	DAH

[Data]

Number	981	Instrument: UPS units. The UPS units switched to battery power in response to a brief (~ 1 s) input power problem.
Start	2014-01-29 11:26
End	2014-01-29 11:26
Added	2014-01-30 09:14
Author	DAH

[Data]

Number	982	Instrument: MST Radar. The beam steering controller gave a critical error message at this time. However, it's not clear what the message meant and the operation of the radar does not appear to have been affected at this time.
Start	2014-01-29 11:50
End	2014-01-29 11:50
Added	2014-01-30 10:32
Author	DAH

[Data]

Number	983	Instrument: MST Radar. There was an unaccountable gap of approximately 5 minutes between the final dwell of one observation cycle and the first dwell of the subsequent cycle.
Start	2014-01-29 14:15
End	2014-01-29 14:21
Added	2014-01-30 11:09
Author	DAH

[Data]

Number	987	Instrument: Beam Steering Controller. The controller indicated that a system error had occurred, although it is not clear what this meant. The radar continued to operate normally.
Start	2014-02-05 13:21
End	2014-02-05 13:21
Added	2014-02-10 15:30
Author	DAH

[Data]

Number	984	Instrument: UPS units. The units switched tp battery power owing to a brief (~ 1 s) input power problem.
Start	2014-02-06 02:11
End	2014-02-06 02:11
Added	2014-02-06 10:23
Author	DAH

[Data]

Number	985	Instrument: MST Radar. There was a slightly raised noise level during this period as LD investigated an on-going problem with the transmitter powering antenna sector E.
Start	2014-02-07 09:20
End	2014-02-07 10:30
Added	2014-02-10 08:34
Author	DAH

[Data]

Number	986	Instrument: UPS units. The UPS units switched to battery power in response to a brief (~ 1 s) input power problem.
Start	2014-02-07 11:08
End	2014-02-07 11:08
Added	2014-02-10 15:24
Author	DAH

[Data]

Number	990	Instrument: MST Radar. The beam steering controller indicated that units 41, 42, 51, and 52 did not respond during this period. They began to respond again without any intervention being taken.
Start	2014-02-07 12:16
End	2014-02-07 13:00
Added	2014-02-10 15:33
Author	DAH

[Data]

Number	991	Instrument: MST Radar. The transmitter powering antenna section B was out of action during this period owing to a blown fuse.
Start	2014-02-10 06:58
End	2014-02-11 10:30
Added	2014-02-13 08:20
Author	DAH

[Data]

Number	988	Instrument: Beam Steering Controller. The controller indicated that a system error had occurred, although it is not clear what this meant. The radar continued to operate normally.
Start	2014-02-10 10:21
End	2014-02-10 10:21
Added	2014-02-10 15:30
Author	DAH

[Data]

Number	989	Instrument: Beam Steering Controller. The controller indicated that a system error had occurred, although it is not clear what this meant. The radar continued to operate normally.
Start	2014-02-10 14:21
End	2014-02-10 14:21
Added	2014-02-10 15:31
Author	ZKO

[Data]

Number	992	Instrument: MST Radar. During this period, beam steering units 83, 93, 94 (which are fed from one power divider), 95, and 41, 42, 51, and 52 (which are fed from one power divider) all reported that they were not responding.
Start	2014-02-11 11:57
End	2014-02-11 12:49
Added	2014-02-13 08:51
Author	DAH

[Data]

Number	993	Instrument: MST Radar. The beam steering controller gave a critical system error message, although the radar continued to operate without a problem.
Start	2014-02-11 16:49
End	2014-02-11 16:49
Added	2014-02-13 09:15
Author	DAH

[Data]

Number	1010	Instrument: MST Radar. The transmitter powering antenna sector A was out of action with a blown fuse.
Start	2014-02-11 18:34
End	2014-02-12 13:48
Added	2014-02-26 09:59
Author	DAH

[Data]

Number	994	Instrument: MST Radar. The beam steering controller gave a critical system error message, although the radar continued to operate without a problem.
Start	2014-02-12 11:32
End	2014-02-12 11:32
Added	2014-02-13 09:16
Author	DAH

[Data]

Number	995	Instrument: UPS units. During this period of extremely strong surface winds, the UPS units indicated that they had switched to battery power on several occasions: at 13:44 for ~ 1 s, at 14:06 for ~ 1 s, at 14:12 twice for ~ 2 s, at 14:55 for ~ 1 s, at 15:22 for ~ 1 s, at 15:24 twice for ~ 1 s, at 15:34 for ~ 1 s, at 16:16 for ~ 1 s, at 16:24 twice for ~ 1 s and once for ~ 3 s, at 16:25 twice for ~ 1 s, at 16:26 for ~ 1 s, and at 17:03 for ~ 1 s. No equipment appears to have gone down during this period.
Start	2014-02-12 13:45
End	2014-02-12 17:05
Added	2014-02-13 09:50
Author	ZKO

[Data]

Number	996	Instrument: UPS units. The units switched to battery power for ~ 6 s in response to an input power problem.
Start	2014-02-13 04:48
End	2014-02-13 04:48
Added	2014-02-13 10:08
Author	DAH

[Data]

Number	997	Instrument: UPS units. The units switched to battery power in response to a brief (~1 s) input power problem.
Start	2014-02-13 20:23
End	2014-02-13 20:23
Added	2014-02-14 08:26
Author	DAH

[Data]

Number	998	Instrument: UPS units. The units switched to battery power in response to a brief (~2 s) input power problem.
Start	2014-02-14 02:45
End	2014-02-14 02:45
Added	2014-02-14 08:28
Author	DAH

[Data]

Number	999	Instrument: UPS units. The units switched to battery power in response to a brief (~1 s) input power problem.
Start	2014-02-14 03:06
End	2014-02-14 03:06
Added	2014-02-14 08:32
Author	DAH

[Data]

Number	1000	Instrument: UPS units. The units switched to battery power in response to a brief (~1 s) input power problem.
Start	2014-02-14 03:20
End	2014-02-14 03:20
Added	2014-02-14 08:33
Author	DAH

[Data]

Number	1001	Instrument: UPS units. The units switched to battery power in response to a brief (~2 s) input power problem.
Start	2014-02-14 05:09
End	2014-02-14 05:09
Added	2014-02-14 08:35
Author	ZKO

[Data]

Number	1003	Instrument: MST Radar. The noise power was raised during this period owing to LD carry out investigations on the transmitter powering antenna sector E.
Start	2014-02-14 09:20
End	2014-02-14 11:00
Added	2014-02-17 08:30
Author	DAH

[Data]

Number	1020	Instrument: Frongoch Surface Wind Sensors. It appears that the data logger malfunctioned during this period. The raw data log files are of the correct format, but contain "0"s for all of the fields other than those relating to the date and time. At first it was thought that the sensor connections might be loose. However, LD checked them on 2014-02-18 and could see no problem. Consequently, DAH tried re-uploading the acquisition program, on 2014-02-18 and 2014-02-19, thinking that it may have been lost as a result of recent power disruptions. However, this did not appear to help (although there are some mysterious periods when actual data appear to exist). Realistic-looking data started to be recorded again at around 2014-02-21 17:20 without any further intervention having been taken.
Start	2014-02-14 18:00
End	2014-02-21 17:20
Added	2014-02-26 14:47
Author	DAH

[Data]

Number	1004
Start	2014-02-15 00:47
End	2014-02-17 09:47
Added	2014-02-17 09:48
Author	DAH

[Data]

Number	1002	Instrument: MST Radar. The beam steering controller indicated that 3 of the transmitters - those powering antenna sectors A, B, and D - had low forward power levels for 1 dwell. There was no obvious effect on radar performance.
Start	2014-02-15 19:29
End	2014-02-15 19:29
Added	2014-02-17 08:27
Author	DAH

[Data]

Number	1005	Instrument: UPS units. The units briefly switched to battery power in response to an input power problem. This happened twice within the space of a few seconds and lasting for ~ 1 s on each occasion.
Start	2014-02-15 21:52
End	2014-02-15 21:52
Added	2014-02-17 10:25
Author	DAH

[Data]

Number	1006	Instrument: MST Radar. The beam steering controller indicated that the transmitters powering antenna sectors A and B had low forward power for 1 dwell. Within a minute, the transmitters for sectors A, B, C, and D were also show to lave low forward power for 1 dwell.
Start	2014-02-15 23:26
End	2014-02-15 23:27
Added	2014-02-17 11:16
Author	DAH

[Data]

Number	1011	Instrument: MST Radar. The beam steering unit gave an unexplained "critical" system error, although the performance of the radar did not appear to be affected.
Start	2014-02-17 12:01
End	2014-02-17 12:01
Added	2014-02-26 10:03
Author	DAH

[Data]

Number	1007	Instrument: UPS units. The units switched to battery power in response to a relatively long (~ 10 s) input power problem.
Start	2014-02-17 15:57
End	2014-02-17 15:57
Added	2014-02-18 09:14
Author	DAH

[Data]

Number	1008	Instrument: UPS units. The units switched to battery power for a relatively long time (~ 20 s) in response to an input power problem.
Start	2014-02-17 16:24
End	2014-02-17 16:24
Added	2014-02-18 09:19
Author	DAH

[Data]

Number	1009	Instrument: UPS units. The units switched to battery power for a relatively long time (~ 12 s) in response to an input power problem.
Start	2014-02-17 17:01
End	2014-02-17 17:01
Added	2014-02-18 09:54
Author	DAH

[Data]

Number	1012	Instrument: MST Radar. The beam steering unit gave an unexplained "critical" system error, although the performance of the radar did not appear to be affected.
Start	2014-02-18 16:49
End	2014-02-18 16:49
Added	2014-02-26 10:05
Author	DAH

[Data]

Number	1019	Instrument: MST Radar. The beam steering controller inidcated that the forward power from all 5 transmitters was briefly low.
Start	2014-02-19 05:11
End	2014-02-19 05:12
Added	2014-02-26 10:19
Author	DAH

[Data]

Number	1013	Instrument: MST Radar. The beam steering unit gave two unexplained "critical" system errors - one at 12:40 and the second at 12:42 - although the performance of the radar did not appear to be affected.
Start	2014-02-19 12:40
End	2014-02-19 12:43
Added	2014-02-26 10:06
Author	DAH

[Data]

Number	1014	Instrument: MST Radar. The beam steering unit gave an unexplained "critical" system error, although the performance of the radar did not appear to be affected.
Start	2014-02-19 15:40
End	2014-02-19 15:40
Added	2014-02-26 10:08
Author	DAH

[Data]

Number	1015	Instrument: MST Radar. The beam steering unit gave an unexplained "critical" system error, although the performance of the radar did not appear to be affected.
Start	2014-02-20 14:50
End	2014-02-20 14:50
Added	2014-02-26 10:11
Author	DAH

[Data]

Number	1016	Instrument: MST Radar. The beam steering unit gave an unexplained "critical" system error, although the performance of the radar did not appear to be affected.
Start	2014-02-21 16:52
End	2014-02-21 16:52
Added	2014-02-26 10:14
Author	DAH

[Data]

Number	1017	Instrument: MST Radar. The beam steering unit gave an unexplained "critical" system error, although the performance of the radar did not appear to be affected.
Start	2014-02-22 22:38
End	2014-02-22 22:38
Added	2014-02-26 10:15
Author	DAH

[Data]

Number	1018	Instrument: MST Radar. The beam steering unit gave an unexplained "critical" system error, although the performance of the radar did not appear to be affected.
Start	2014-02-22 23:31
End	2014-02-22 23:31
Added	2014-02-26 10:16
Author	DAH

[Data]

Number	1042	Instrument: MST Radar. The transmitter powering antenna sector B was out of action for most of this period. Between 2014-02-27 01:12 and 2014-03-11 14:50 UT it had a blown fuse. It was then in operation for just over an hour (until 2014-03-11 15:59 UT) when it went down with error code 6 ("Analogue parameter error st state 3") and was restarted the following day (at 2014-03-12 13:03 UT), but only stayed in operation for 7 minutes (until 2014-03-12 13:10 UT), when it went down with a blown fuse. It was repaired 2 days later, at 2014-03-14 10:05 UT.
Start	2014-02-27 01:12
End	2014-03-14 10:05
Added	2014-03-31 16:38
Author	DAH

[Data]

Number	1021	Instrument: MST Radar. The transmitter powering antenna sector E was out of action during this period owing to a blown HV fuse.
Start	2014-02-28 00:34
End	2014-02-28 12:37
Added	2014-02-28 16:28
Author	DAH

[Data]

Number	1022	Instrument: MST Radar. The beam steering unit gave an unexplained "critical" system error, although the performance of the radar did not appear to be affected.
Start	2014-02-28 23:30
End	2014-02-28 23:30
Added	2014-03-05 14:03
Author	DAH

[Data]

Number	1038	Instrument: MST Radar. The beam steering controller indicated a dip in forward power. for antenna sector A, for 1 dwell.
Start	2014-03-01 06:50
End	2014-03-01 06:50
Added	2014-03-28 09:42
Author	DAH

[Data]

Number	1039	Instrument: MST Radar. The beam steering controller indicated a dip in forward power. for antenna sectors A and D, for 1 dwell.
Start	2014-03-01 18:45
End	2014-03-01 18:45
Added	2014-03-28 09:43
Author	DAH

[Data]

Number	1023	Instrument: MST Radar. The beam steering unit gave an unexplained "critical" system error, although the performance of the radar did not appear to be affected.
Start	2014-03-03 11:47
End	2014-03-03 11:47
Added	2014-03-05 14:03
Author	DAH

[Data]

Number	1024	Instrument: MST Radar. The beam steering unit gave an unexplained "critical" system error, although the performance of the radar did not appear to be affected.
Start	2014-03-03 12:49
End	2014-03-03 12:49
Added	2014-03-05 14:04
Author	DAH

[Data]

Number	1025	Instrument: MST Radar. The beam steering unit gave an unexplained "critical" system error, although the performance of the radar did not appear to be affected.
Start	2014-03-03 13:21
End	2014-03-03 13:21
Added	2014-03-05 14:05
Author	DAH

[Data]

Number	1026	Instrument: MST Radar. The beam steering unit gave an unexplained "critical" system error, although the performance of the radar did not appear to be affected.
Start	2014-03-03 16:26
End	2014-03-03 16:26
Added	2014-03-05 14:05
Author	ZKO

[Data]

Number	1029	Instrument: MST Radar. The beam steering controller gave a Critical error message, although the operation of the radar does not appear to have been affected.
Start	2014-03-12 09:25
End	2014-03-12 09:25
Added	2014-03-28 09:29
Author	DAH

[Data]

Number	1046	Instrument: MST Radar. The transmitter powering antenna sector B was out of action for most of this time. Initially its fuse blew. This was fixed two days later, at 2014-03-18 12:03 UT, but it was up and down again a few times during the rest of the day. It was finally restored to working order at 2014-03-25 11:19 UT.
Start	2014-03-14 14:27
End	2014-03-25 11:19
Added	2014-04-01 09:42
Author	DAH

[Data]

Number	1030	Instrument: MST Radar. The beam steering controller gave a Critical error message, although the operation of the radar does not appear to have been affected.
Start	2014-03-14 15:14
End	2014-03-14 15:14
Added	2014-03-28 09:30
Author	DAH

[Data]

Number	1031	Instrument: MST Radar. The beam steering controller gave a Critical error message, although the operation of the radar does not appear to have been affected.
Start	2014-03-14 16:11
End	2014-03-24 16:11
Added	2014-03-28 09:30
Author	DAH

[Data]

Number	1032	Instrument: MST Radar. The beam steering controller gave a Critical error message, although the operation of the radar does not appear to have been affected.
Start	2014-03-14 16:56
End	2014-03-14 16:56
Added	2014-03-28 09:31
Author	DAH

[Data]

Number	1033	Instrument: MST Radar. The beam steering controller gave a Critical error message, although the operation of the radar does not appear to have been affected.
Start	2014-03-14 17:02
End	2014-03-14 17:02
Added	2014-03-28 09:31
Author	DAH

[Data]

Number	1034	Instrument: MST Radar. The beam steering controller gave a Critical error message, although the operation of the radar does not appear to have been affected.
Start	2014-03-19 11:23
End	2014-03-19 11:23
Added	2014-03-28 09:32
Author	DAH

[Data]

Number	1035	Instrument: MST Radar. The beam steering controller gave a Critical error message, although the operation of the radar does not appear to have been affected.
Start	2014-03-25 14:50
End	2014-03-25 14:50
Added	2014-03-28 09:32
Author	DAH

[Data]

Number	1047	Instrument: MST Radar. The transmitter powering antenna sector B was down with an analogue error.
Start	2014-03-25 19:52
End	2014-03-27 11:56
Added	2014-04-01 10:12
Author	DAH

[Data]

Number	1028	Instrument: Vaisala WXT510. No data were collected during the period 16:19 - 18:37 UT on 2014-03-26 owing to the data acquisition PC ("julius") being powered down. The BADC file for the day could not be created for the day owing to a known bug in the software, which is triggered by a gap in the data.
Start	2014-03-26 00:00
End	2014-03-26 23:59
Added	2014-03-28 09:20
Author	DAH

[Data]

Number	1036	Instrument: MST Radar. The beam steering controller gave a Critical error message, although the operation of the radar does not appear to have been affected.
Start	2014-03-26 10:04
End	2014-03-26 10:04
Added	2014-03-28 09:34
Author	DAH

[Data]

Number	1037	Instrument: MST Radar. The beam steering controller gave a Critical error message, although the operation of the radar does not appear to have been affected.
Start	2014-03-26 13:57
End	2014-03-26 13:57
Added	2014-03-28 09:35
Author	DAH

[Data]

Number	1027	Instrument: MST Radar. The radar was out of action during this period to allow AD to replace a failed disk on the radar control PC, "julius".
Start	2014-03-26 14:50
End	2014-03-26 18:45
Added	2014-03-28 08:28
Author	DAH

[Data]

Number	1040	Instrument: MST Radar. The beam steering controller indicated that unit 35 (antenna sector B) was not responding for over 15 minutes on two occasions durig this period.
Start	2014-03-27 03:40
End	2014-03-27 06:33
Added	2014-03-28 09:53
Author	DAH

[Data]

Number	1048	Instrument: MST Radar. The transmitter powering antenna sector B was down with an analogue error.
Start	2014-03-27 20:40
End	2014-03-28 09:52
Added	2014-04-01 10:14
Author	DAH

[Data]

Number	1041	Instrument: MST Radar. The beam steering controller indicated that unit 35 (antenna sector B) was not responding during this period.
Start	2014-03-28 00:29
End	2014-03-28 01:54
Added	2014-03-28 09:55
Author	DAH

[Data]

Number	1043	Instrument: MST Radar. The transmitter powering antenna sector B was down with error code 7: "analogue parameter error at state 4". DAH restarted the transmitter remotely.
Start	2014-03-29 19:28
End	2014-03-31 07:24
Added	2014-04-01 08:36
Author	DAH

[Data]

Number	1045	Instrument: Vaisala LD40 Ceilometer. There are no observations for this period. It turns out that the data acquisition software had simply stopped logging messages (the problem was solved by restarting the software). However, DAH had orginally assumed that he had accidentally loosened a connection when he was on site during the previous week. Consequently he waited for LD to be on site to inspect the cables and to power-cycle the instrument - though this failed to restart the acquisition.
Start	2014-03-30 15:49
End	2014-04-02 07:35
Added	2014-04-01 08:41
Author	DAH

[Data]

Number	1044	Instrument: MST Radar. The transmitter powering antenna sector B was down with error code 7: "analogue parameter error at state 4". DAH restarted the transmitter remotely.
Start	2014-03-31 19:17
End	2014-04-01 07:07
Added	2014-04-01 08:36
Author	DAH

[Data]

Number	1049	Instrument: MST Radar. The transmitter powering antenna sector B shut down with error code 7: "analogue parameter error at state 4". DAH restarted it remotely.
Start	2014-04-01 10:22
End	2014-04-01 10:55
Added	2014-04-01 16:28
Author	DAH

[Data]

Number	1050	Instrument: MST Radar. The transmitter powering antenna sector B shut down with error code 7: "analogue parameter error at state 4". DAH restarted it remotely.
Start	2014-04-01 11:51
End	2014-04-01 13:00
Added	2014-04-01 16:29
Author	DAH

[Data]

Number	1051	Instrument: MST Radar. The transmitter powering antenna sector B shut down with error code 7: "analogue parameter error at state 4". DAH restarted it remotely.
Start	2014-04-02 00:59
End	2014-04-02 07:05
Added	2014-04-02 08:20
Author	DAH

[Data]

Number	1052	Instrument: MST Radar. The transmitter powering antenna sector B shut down with error code 7: "analogue parameter error at state 4". DAH restarted it remotely.
Start	2014-04-02 16:41
End	2014-04-03 07:00
Added	2014-04-03 08:54
Author	DAH

[Data]

Number	1053	Instrument: MST Radar. The transmitter powering antenna sector B shut down with error code 7: "analogue parameter error at state 4". DAH restarted it remotely.
Start	2014-04-03 13:40
End	2014-04-03 13:46
Added	2014-04-03 14:49
Author	DAH

[Data]

Number	1054	Instrument: MST Radar. The transmitter powering antenna sector B shut down with error code 7: "analogue parameter error at state 4". DAH restarted it remotely.
Start	2014-04-03 15:00
End	2014-04-03 15:07
Added	2014-04-03 16:07
Author	DAH

[Data]

Number	1056	Instrument: UPS units. The units switched to battery power for a relatively long - 4 minutes - input power problem.
Start	2014-04-03 17:54
End	2014-04-03 17:58
Added	2014-04-04 08:52
Author	DAH

[Data]

Number	1058	Instrument: MST Radar. The socket between the radar control PC and beam steering controller was broken unexpectedly. It seems likely that this was connected with the simultaneous input power problem detected by the UPS units. There was a gap of 200 s whilst the radar control PC made repeated efforts to reconnect. The operation of the radar does not appear to have been otherwise affected.
Start	2014-04-03 17:55
End	2014-04-03 17:59
Added	2014-04-04 09:55
Author	DAH

[Data]

Number	1057	Instrument: UPS units. The units switched to battery power for 11 minutes in response to an input power problem. The unit for TX1 sent a message at 18:44 indicating that the battery power was too low to continue to support the load for much longer. However, it appears to have lasted out until the input power returned to normal a few minutes later. Nevertheless, the MST radar beam steering controller sent a number of alerts during this period.
Start	2014-04-03 18:36
End	2014-04-03 18:47
Added	2014-04-04 09:19
Author	DAH

[Data]

Number	1055	Instrument: MST Radar. The transmitter powering antenna sector B shut down with error code 7: "analogue parameter error at state 4". DAH restarted it remotely.
Start	2014-04-03 19:24
End	2014-04-04 07:20
Added	2014-04-04 08:27
Author	DAH

[Data]

Number	1060	Instrument: MST Radar. The transmitter for antenna sector B was out of action for this period. It had been giving repeated analogue errors and LD was having difficulties getting it restarted. It was returned to operational status after a new voltage reference component was installed.
Start	2014-04-04 09:15
End	2014-04-09 11:14
Added	2014-04-11 13:29
Author	DAH

[Data]

Number	1059	Instrument: MST Radar. The transmitter for antenna sector C was out of action during this period owing to a blown fuse. The transmitter for antenna sector B was simultaneously out of action.
Start	2014-04-07 00:32
End	2014-04-08 11:00
Added	2014-04-08 12:17
Author	DAH

[Data]

Number	1061	Instrument: MST Radar. Beam steering unit 87 gave a brief (i.e. one dwell) indication of low supply voltage before readings returned to normal.
Start	2014-04-10 09:33
End	2014-04-10 09:33
Added	2014-04-11 13:43
Author	DAH

[Data]

Number	1062	Instrument: MST Radar. The beam steering controller indicated that the transmitters for antenna sectors A, B, and C briefly had low forward power.
Start	2014-04-11 07:24
End	2014-04-11 07:24
Added	2014-04-11 13:49
Author	DAH

[Data]

Number	1067	Instrument: MST Radar. The transmitter powering antenna sector C was out of action with a blown fuse for much of this period. LD fixed it at 11:35 UT on the following day (2014-04-16) but it proved unstable and was up and down several times over the next few minutes. LD left it in a down state between 11:42 and 14:52 UT. However, it was again up and down several times and LD left it in a down state at 16:22 UT (on 2014-04-16). He then left it for a few days, until 2014-04-23, when he had it up between 14:00 and 14:07 UT. However, it was soon down again with an analogue error (code 7). It was back in action at 09:21 UT on 2014-04-29 but was down again within a minute. It was back up between 11:21 and 13:10 UT and then again at 14:30. It blew its fuse at 22:30 UT the following evening (2014-04-30). It was back up at 08:57 UT on 2014-05-02. This time it lasted 2 days until 08:38 on 2014-05-04. Finally, it has been stable since being restored at 09:13 on 2014-05-06.
Start	2014-04-15 14:39
End	2014-05-06 09:13
Added	2014-05-12 15:32
Author	DAH

[Data]

Number	1063	Instrument: UPS units. The units switched to battery power twice within a minute, for ~ 1 s each time, in response to an input power power problem.
Start	2014-04-20 19:00
End	2014-04-20 19:00
Added	2014-04-21 12:22
Author	DAH

[Data]

Number	1064	Instrument: MST Radar. Beam steering unit 37 was indicating high VSWR values, of around 2.5, for much of the day. This led to numerous e-mails being sent by the beam steering controller.
Start	2014-05-08 06:35
End	2014-05-08 15:47
Added	2014-05-09 09:04
Author	DAH

[Data]

Number	1065	Instrument: MST Radar. The radar was stopped briefly so that LD could change beam steering unit 37, which had been seeing high VSWR values.
Start	2014-05-09 10:24
End	2014-05-09 10:37
Added	2014-05-09 12:08
Author	DAH

[Data]

Number	1066	Instrument: Campbell Scientific Tipping Bucket Raingauge. The raingauge detected only 3 widely-spaced tips (0.2 mm of rain each) during the course of the day, whilst the Vaisala WXT510 sensor detected rain that was more-persistent and more-widespread. It's not clear if this is because the rain really did lead to small accumulations of whether the tipping bucket raingauge is becoming blocked.
Start	2014-05-10 00:00
End	2014-05-10 23:59
Added	2014-05-12 09:20
Author	DAH

[Data]

Number	1069	Instrument: Campbell Scientific Tipping Bucket Raingauge. The instrument failed to detect two rain events - at around 01:30 and 06:30 - 07:30 UT - seen by the WXT510 sensor. LD cleaned out the raingauge at around 09:00 UT and found that it had become blocked.
Start	2014-05-13 00:00
End	2014-05-13 09:00
Added	2014-05-14 08:43
Author	DAH

[Data]

Number	1068	Instrument: MST Radar. The radar was stopped so that LD could reinstate the beam steering unit that he had recently removed from quad 37. One of its coils had been loose and he wanted to put it back into service after this was fixed.
Start	2014-05-13 09:37
End	2014-05-13 10:27
Added	2014-05-13 12:02
Author	DAH

[Data]

Number	1071	Instrument: Campbell Scientific Tipping Bucket Raingauge. The raingauge failed to detect rain events measured by the WXT510 on 23rd, 24th, and 25th May 2014. It seems likely that the inlet had not been correctly aligned when LD last cleaned it on 2014-05-13. LD adjusted it on 2014-05-30 and poured a litre of water into it, at around 10:00 UT, in order to establish that it was working. The reading at that time does not represent real rain.
Start	2014-05-23 00:00
End	2014-05-30 10:30
Added	2014-06-04 13:53
Author	DAH

[Data]

Number	1070	Instrument: UPS units. The UPS units switched to battery power for ~ 1 s in response to an input power problem.
Start	2014-05-23 07:05
End	2014-05-23 07:05
Added	2014-05-23 08:29
Author	DAH

[Data]

Number	1072	Instrument: Campbell Scientific Wind Sensors. There were several instances during this period when the raw data readings, including for wind direction, were all zeros. These do not look realistic. Although at first it was assumed that there had been a malfunction of the data logger, these are possibly artefacts of very low wind speeds, e.g. of the wind speed dropping so low that it cannot overcome the friction of the wind vane's bearings. Although this does not (obviously) explain why the direction readings should also be zero, all cases were associated with low wind speeds. The problem was seen during the follwing, inclusive periods (UT): on 2014-05-26, 20:29 - 20:31, 22:06 - 22:32, 23:27 - 23:33, 23:37 - 23:39, 23:48 - 23:56; on 2014-05-27, 00:00 - 00:12, 01:02 - 01:38, 01:54 - 02:01, 02:10 - 02:29, 02:47 - 03:15, 03:38 - 04:04, 04:12 - 04:31, 19:03 - 19:14, 22:34 - 22:41, 23:11 - 23:59; on 2014-05-28, 00:00 - 00:09, 00:39 - 01:41, 01:55 - 02:00, and 02:12 - 04:24.
Start	2014-05-26 20:29
End	2014-05-28 04:24
Added	2014-06-04 15:10
Author	DAH

[Data]

Number	1073	Instrument: Campbell Scientific Wind Sensors. There were several instances during this period when the raw data readings, including for wind direction, were all zeros. These do not look realistic. Although at first it was assumed that there had been a malfunction of the data logger, these are possibly artefacts of very low wind speeds, e.g. of the wind speed dropping so low that it cannot overcome the friction of the wind vane's bearings. Although this does not (obviously) explain why the direction readings should also be zero, all cases were associated with low wind speeds. The problem was seen during the follwing, inclusive periods (UT): on 2014-05-26, 20:29 - 20:31, 22:06 - 22:32, 23:27 - 23:33, 23:37 - 23:39, 23:48 - 23:56; on 2014-05-27, 00:00 - 00:12, 01:02 - 01:38, 01:54 - 02:01, 02:10 - 02:29, 02:47 - 03:15, 03:38 - 04:04, 04:12 - 04:31, 19:03 - 19:14, 22:34 - 22:41, 23:11 - 23:59; on 2014-05-28, 00:00 - 00:09, 00:39 - 01:41, 01:55 - 02:00, and 02:12 - 04:24.
Start	2014-05-26 20:29
End	2014-05-28 04:24
Added	2014-06-04 15:27
Author	DAH

[Data]

Number	1074	Instrument: Campbell Scientific Wind Sensors. The raw data files contain zeros for all parameters (including wind direction) for the following, inclusive periods (UT): 02:50 - 02:58, 03:02 - 03:04, 03:08 - 03:09, 03:54 - 03:56, 04:06 - 04:07, 06:50 - 06:51, 20:37 - 21:07, and 22:14 - 23:04.
Start	2014-05-30 02:50
End	2014-05-30 23:04
Added	2014-06-04 15:27
Author	DAH

[Data]

Number	1075	Instrument: Campbell Scientific Wind Sensors. The raw data files contain zeros for all parameters (including wind direction) for the following, inclusive periods (UT): 17:22 - 18:02, 18:26 - 18:27, 18:47 - 18:48, 18:58 - 19:02.
Start	2014-06-01 17:22
End	2014-06-01 19:02
Added	2014-06-04 16:20
Author	DAH

[Data]

Number	1076	Instrument: Campbell Scientific Wind Sensors. The raw data files contain zeros for all parameters (including wind direction) for the following, inclusive periods (UT): 20:04 - 20:32, 20:42 - 20:47, 21:05 - 22:02.
Start	2014-06-03 20:04
End	2014-06-03 22:02
Added	2014-06-04 16:24
Author	DAH

[Data]

Number	1089	Instrtument: MST Radar. The transmitter for antenna sector C was out of action with a blown fuse.
Start	2014-06-04 17:39
End	2014-06-05 09:35
Added	2014-07-02 10:31
Author	DAH

[Data]

Number	1078	Instrument: Campbell Scientific Wind Sensors. The raw data files contain zeros for all parameters (including wind direction) for this period.
Start	2014-06-05 19:37
End	2014-06-05 20:20
Added	2014-06-18 11:28
Author	DAH

[Data]

Number	1088	Instrumehnt: MST Radar. The transmitter for antenna sector B was out of action with a blown fuse.
Start	2014-06-06 07:31
End	2014-06-10 09:09
Added	2014-07-02 10:26
Author	DAH

[Data]

Number	1079	Instrument: Campbell Scientific Wind Sensors. The raw data files contain zeros for all parameters (including wind direction) for this period.
Start	2014-06-07 10:24
End	2014-06-07 10:41
Added	2014-06-18 11:34
Author	DAH

[Data]

Number	1080	Instrument: Campbell Scientific Wind Sensors. The raw data files contain zeros for all parameters (including wind direction) for the following, inclusive periods (UT): 03:53 - 04:00, 05:36 - 05:41, 18:41 - 18:57, 19:06 - 19:09, 19:33 - 19:43, 19:49 - 19:56, and 20:14 - 20:27.
Start	2014-06-09 03:53
End	2014-06-09 20:27
Added	2014-06-18 11:44
Author	DAH

[Data]

Number	1081	Instrument: Campbell Scientific Wind Sensors. The raw data files contain zeros for all parameters (including wind direction) for the following, inclusive periods (UT): 22:04 - 22:30, 23:41 - 23:45, 23:52 - 23:59.
Start	2014-06-11 22:04
End	2014-06-18 11:44
Added	2014-06-18 11:47
Author	ZKO

[Data]

Number	1082	Instrument: Campbell Scientific Wind Sensors. The raw data files contain zeros for all parameters (including wind direction) for the following, inclusive periods (UT): 00:00 - 00:13, 00:18 - 00:46, 20:53 - 21:52, and 22:14 - 22:55.
Start	2014-06-12 00:00
End	2014-06-12 22:55
Added	2014-06-18 11:52
Author	DAH

[Data]

Number	1083
Start	2014-06-13 05:59
End	2014-06-13 11:52
Added	2014-06-18 11:56
Author	ZKO

[Data]

Number	1084	Instrument: Campbell Scientific Wind Sensors. The raw data files contain zeros for all parameters (including wind direction) for the following, inclusive periods (UT): 05:59 - 06:16, 06:25 - 06:30, 06:50 - 07:07, 07:17 - 07:24, 07:32 - 07:38.
Start	2014-06-13 05:59
End	2014-06-13 11:56
Added	2014-06-18 16:37
Author	ZKO

[Data]

Number	1077	Instrument: LD40 Laser Ceilometer. The acquisition program crashed for no apparent reason leading to a data gap until DAH spotted this on the following morning.
Start	2014-06-17 16:12
End	2014-06-18 07:19
Added	2014-06-18 10:21
Author	DAH

[Data]

Number	1087	Instrument: MST Radar. The transmitter for antenna sector C was out of action with a blown fuse.
Start	2014-06-20 05:44
End	2014-06-20 09:49
Added	2014-07-02 10:15
Author	DAH

[Data]

Number	1866	Instrument: MST Radar. The radar appears to have experience interference during this period. Although the v3 processing was largely successful at avoiding it, some mild contamination of the v4 winds is apparent at altitudes above 14 km.
Start	2014-06-22 14:50
End	2014-06-22 15:40
Added	2017-09-15 15:34
Author	DAH

[Data]

Number	1086	Instrument: MST Radar. The transmitter for antenna sector B was out of action with a blown fuse.
Start	2014-06-23 01:56
End	2014-06-25 15:58
Added	2014-07-02 10:10
Author	DAH

[Data]

Number	1085	Instrument: UPS units. The units switched to battery power for approximately 22 s in response to an input power problem.
Start	2014-06-28 16:14
End	2014-06-28 16:14
Added	2014-06-30 12:15
Author	DAH

[Data]

Number	1090	Instrument: UPS units. The UPS units switched to battery power owing to two input power problems in short succession. The first lasted 13 and the second 12 s.
Start	2014-07-03 06:24
End	2014-07-03 06:24
Added	2014-07-03 08:31
Author	DAH

[Data]

Number	1097	INstrument: MST Radar. The transmitter for antenna sector C was out of action with a blown fuse.
Start	2014-07-04 14:38
End	2014-07-08 08:53
Added	2014-07-29 14:22
Author	DAH

[Data]

Number	1091	Instrument: UPS Units. The units switched to battery power in response to a ~ 1 s input power problem.
Start	2014-07-04 14:43
End	2014-07-04 14:43
Added	2014-07-04 16:12
Author	DAH

[Data]

Number	1862	Instrument: MST Radar. The horizontal wind speed from the v4 processing is unrealistically large during this period within a narrow altitude region at around 9.5 km.
Start	2014-07-04 15:00
End	2014-07-04 15:40
Added	2017-09-15 14:25
Author	DAH

[Data]

Number	1092	Instrument: MST Radar. The transmitter for antenna sector C was out of action. It shut down with error code 4: "Analogue Parameter Error at State 1". This meant that even the main power was shut down. DAH restarted the transmitter remotely.
Start	2014-07-10 09:13
End	2014-07-11 07:37
Added	2014-07-11 08:43
Author	DAH

[Data]

Number	1093	Instrument: UPS units. The units switched to battery power briefly (~ 1 s) in response to an input power problem.
Start	2014-07-19 02:11
End	2014-07-19 02:11
Added	2014-07-21 12:54
Author	DAH

[Data]

Number	1094	INstrument: MST Radar. The transmitter for antenna sector B was out of action with a blown fuse.
Start	2014-07-20 03:19
End	2014-07-22 08:47
Added	2014-07-22 10:27
Author	DAH

[Data]

Number	1095	Instrument: Vaisala LD40 Ceilometer. The data acquisition program shut down unexpectedly leading to a gap in the observations.
Start	2014-07-24 03:00
End	2014-07-24 07:00
Added	2014-07-24 08:52
Author	DAH

[Data]

Number	1099	Instrument: Internet Connection. The internet connection on both the MST and Manchester lines became slow/intermittent during this period. This didn't become apparent until the morning of 2014-07-28, when DAH noticed that file tranfers to RAL were backing up. The time stamps of files at RAL suggest that there were two periods of several hours (during the evenings of 2014-07-24 and 2014-07-26) when no file transfers took place. It appears that the problem was caused by lightning damage at the Capel Bangor exchange. Although Openreach have not yet closed the case, the internet service provider indicated that transfer speeds had been stable since around 2014-08-01 00:00 UT.
Start	2014-07-24 18:15
End	2014-08-01 00:00
Added	2014-08-01 10:02
Author	DAH

[Data]

Number	1096	Instrument: MST Radar. The transmitter powering antenna sector C was out of action with a blown fuse.
Start	2014-07-27 02:14
End	2014-07-29 09:33
Added	2014-07-29 14:15
Author	DAH

[Data]

Number	1863	Instrument: MST Radar. The horizontal wind speed from the v4 processing is unrealistically large during this period within a narrow altitude region at around 9.0 km.
Start	2014-07-27 08:40
End	2014-07-27 09:30
Added	2017-09-15 14:42
Author	DAH

[Data]

Number	1098	Instrument: Surface Met Sensors, Surface Wind Sensors, Vaisala LD40 Laser Ceilometer. PC "Gaius", which logs data from these 3 sets of instruments, encountered an error at around 2014-07-27 14:40 UT. This stopped raw data files from being transferred up to RAL (and prevented DAH from remotely logging on to the PC) although it does not appear to have stopped data from being acquired. DAH was able to access the files once LD had cleared the error message.
Start	2014-07-27 14:40
End	2014-07-29 09:00
Added	2014-07-29 15:29
Author	DAH

[Data]

Number	1864	Instrument: MST Radar. The horizontal wind speed from the v4 processing is unrealistically large during this period within a narrow altitude region at around 9.5 km.
Start	2014-07-29 17:20
End	2014-07-29 18:10
Added	2017-09-15 14:46
Author	DAH

[Data]

Number	1865	Instrument: MST Radar. The horizontal wind speed from the v4 processing is unrealistically large during this period within a narrow altitude region at around 9.5 km.
Start	2014-07-30 17:30
End	2014-07-30 18:20
Added	2017-09-15 14:51
Author	DAH

[Data]

Number	1859	Instrument: MST Radar. The radar suffered from interference during this period. Although the v3 processing managed to filter most of this out, some contamination of the v4 horizontal wind spees is apparent at altitudes above 15 km.
Start	2014-08-06 18:45
End	2014-08-06 19:50
Added	2017-09-15 12:00
Author	DAH

[Data]

Number	1860	Instrument: MST Radar. The horizontal wind speed from the v4 processing is unrealistically large during this period at just above 8km altitude.
Start	2014-08-07 17:20
End	2014-08-07 18:10
Added	2017-09-15 12:07
Author	DAH

[Data]

Number	1861	Instrument: MST Radar. The horizontal wind speed from the v4 processing is unrealistically large during this period at just above 8km altitude.
Start	2014-08-08 20:20
End	2014-08-08 21:00
Added	2017-09-15 12:13
Author	DAH

[Data]

Number	1100	Instrument: UPS units. The units switched briefly (~ 1 s) to battery power in response to an input power problem.
Start	2014-08-14 12:59
End	2014-08-14 12:59
Added	2014-08-14 14:06
Author	DAH

[Data]

Number	1101	Instrument: MST Radar. The radar suffered from a short period of interference. This appears to have omnly affected the m-mode observations.
Start	2014-08-19 09:50
End	2014-08-19 10:45
Added	2014-08-21 08:35
Author	DAH

[Data]

Number	1102	Instrument: UPS Units. The units switched to battery power for approximately 1 s in response to an input power problem.
Start	2014-08-22 16:47
End	2014-08-22 16:47
Added	2014-08-26 09:41
Author	DAH

[Data]

Number	1103	Instrument: MST Radar. The transmitter for antenna sector B was out of action with a blown fuse.
Start	2014-08-22 22:44
End	2014-08-26 09:20
Added	2014-08-26 11:13
Author	DAH

[Data]

Number	1104	Instrument: UPS Units. The units switched to battery power for ~ 1 s in response to an input power problem.
Start	2014-09-13 12:49
End	2014-09-13 12:49
Added	2014-09-15 09:36
Author	DAH

[Data]

Number	1105	Instrument: UPS Units. The units switched to battery power for ~ 1 s in response to an input power problem.
Start	2014-09-15 16:23
End	2014-09-15 16:23
Added	2014-09-16 08:59
Author	DAH

[Data]

Number	1106	Instrument: UPS Units. The units switched to battery power for ~ 1 s in response to an input power problem.
Start	2014-09-15 23:54
End	2014-09-15 23:54
Added	2014-09-16 09:09
Author	DAH

[Data]

Number	1119	Instrument: Vaisala WXT510. The data messages for temperature, pressure, and humidity were showing values of 0.0 for most of this period (realistic-looking data appeared sporadically at the beginning and the end of the period). Although attempts were made to clear the problem, e.g. by power-cycling the unit, these did not have the desired effect. Normal functioning evebtually resumed without any further intervention being taken.
Start	2014-09-17 01:56
End	2014-10-13 13:47
Added	2014-10-17 16:24
Author	DAH

[Data]

Number	1107	Instrument: Broadband. The "fax" line, which carries the MSTRF's broadband connection, developed a fault. There was no dial tone on the line and a complete loss of broadband. An OpenReach engineer visited the site during the evening of 2014-09-24 having found the source of the problem elsewhere.
Start	2014-09-19 09:15
End	2014-09-24 17:30
Added	2014-09-26 15:35
Author	DAH

[Data]

Number	1108	Instrument: MST Radar. The radar was out of action owing to the electricity supply for the whole area being turned off. The latter was to allow essential maintenance work to be carried out by the local supplier. All equipment at the radar site was powered down shortly before the electricity supply was due to be cut and then restarted late in the afternoon.
Start	2014-09-25 07:55
End	2014-09-25 18:29
Added	2014-09-26 16:35
Author	DAH

[Data]

Number	1109	Instrument: MST Radar. Two of the transmitters, those for antenna sectors B and D were out of action for most of this period and one more, that for sector E, was out of action for part of it. This resulted in reduced altitude coverage. At around 18:35, TXB blew its HV fuse and TXD developed an analogue error (error code 7). TXE blew its HV fuse at 23:51. DAH restarted TXD on several occasions between 07:00 and 08:00, although it was unstable shut down again each time. TXB and TXB were back in action at 08:51 and TXD at 09:34.
Start	2014-09-25 18:35
End	2014-09-29 09:34
Added	2014-09-29 09:42
Author	DAH

[Data]

Number	1110	Instrument: MST Radar. The radar appears to have suffered from interference, which led to a reduction in altitude coverage.
Start	2014-09-29 10:15
End	2014-09-29 11:30
Added	2014-09-30 08:44
Author	DAH

[Data]

Number	1111	Instrument: MST Radar. The radar was powered down durintg this interval to allow LD to switch beam steering unit 94. The latter had intermittently been reporting high VSWR values of between 2.5 and 3.0.
Start	2014-09-30 09:00
End	2014-09-30 09:43
Added	2014-10-01 08:35
Author	DAH

[Data]

Number	1120	Instrument: MST Radar. The transmitter for antenna sector B was out of action fo this period as it would not stay in operation in a stable manner. LD changed the PIN diodes and voltage regulator in the TX/RX power supply before restarting it.
Start	2014-09-30 10:00
End	2014-10-07 11:57
Added	2014-10-21 16:27
Author	DAH

[Data]

Number	1112	Instrument: UPS Units. The units switched to battery power in response to a a brief (~ 1 s) input power problem.
Start	2014-10-08 11:24
End	2014-10-08 11:24
Added	2014-10-08 14:35
Author	DAH

[Data]

Number	1113	Instrument: UPS Units. The units switched to battery power briefly (~ 1 s) owing to an input power problem.
Start	2014-10-08 17:33
End	2014-10-08 17:33
Added	2014-10-10 09:48
Author	DAH

[Data]

Number	1114	Instrument: UPS Units. The units switched to battery power briefly (~ 1 s) owing to an input power problem.
Start	2014-10-08 21:58
End	2014-10-08 21:58
Added	2014-10-10 10:17
Author	ZKO

[Data]

Number	1115	Instrument: UPS Units. The units switched to battery power briefly (~ 1 s) owing to an input power problem.
Start	2014-10-08 22:29
End	2014-10-08 22:29
Added	2014-10-10 10:18
Author	DAH

[Data]

Number	1116	Instrument: UPS Units. The units switched to battery power briefly (~ 1 s) owing to an input power problem.
Start	2014-10-09 03:32
End	2014-10-09 03:32
Added	2014-10-10 10:20
Author	DAH

[Data]

Number	1117	Instrument: UPS Units. The units switched to battery power briefly (~ 1 s) owing to an input power problem.
Start	2014-10-09 03:44
End	2014-10-09 03:44
Added	2014-10-10 10:21
Author	DAH

[Data]

Number	1118	Instrument: UPS Units. The units switched briefly (~ 1 s) to battery power in response to an input power problem.
Start	2014-10-16 20:02
End	2014-10-16 20:02
Added	2014-10-17 08:33
Author	DAH

[Data]

Number	1123	Instrument: MST Radar. The beam steering controller gave a series of unusal error and warning messages indicating a segmentation fault and process failures. This appears to added an extra 40 s to the duration of the 23:11:14 cycle with lengthened gaps betweren the 8th and 9th and between the 11th and 12th dwells. Normal operation appears to have been resumed by the beginning of the following cycle.
Start	2014-11-01 23:11
End	2014-11-01 23:17
Added	2014-11-13 11:52
Author	DAH

[Data]

Number	1125	Instrument: MST Radar. The transmitter for antenna sector E was out of action owing to a blown fuse.
Start	2014-11-04 03:59
End	2014-11-04 11:14
Added	2014-11-14 14:24
Author	DAH

[Data]

Number	1121	Instrument: UPS units. The UPS units switched briefly (~ 1 s) to battery power in response to an input power problem.
Start	2014-11-09 17:53
End	2014-11-09 17:53
Added	2014-11-10 11:17
Author	DAH

[Data]

Number	1122	Instrument: UPS units. The UPS units switched briefly (~ 1 s) to battery power in response to an input power problem.
Start	2014-11-09 18:23
End	2014-11-09 18:23
Added	2014-11-10 11:24
Author	DAH

[Data]

Number	1124	Instrument: UPS units. The units switched to battery power briefly (~ 1 s) in response to an input power problem.
Start	2014-11-13 12:42
End	2014-11-13 12:42
Added	2014-11-13 16:29
Author	DAH

[Data]

Number	1130	Instrument: MST Radar. The transmitter for antenna sector C was out of action for this period. It initially showed error code 4 ("analog parameter error at state 1"). It was briefly (2014-11-16 18:43 - 19:05) retsored to normal operation before going down with error code 7 ("analog parameter error at state 4").
Start	2014-11-15 19:43
End	2014-11-18 09:53
Added	2015-01-05 14:46
Author	DAH

[Data]

Number	1126	Instrument: MST Radar. The transmitter for antenna sector C was out of action with error code 7: "Analogue Parameter Error at State 4".
Start	2014-11-21 01:53
End	2014-11-21 10:52
Added	2014-11-21 15:36
Author	DAH

[Data]

Number	1129	Instrument: MST Radar. The transmitter for antenna sector C was out of action owing to a blown fuse.
Start	2014-12-23 08:01
End	2014-12-23 11:58
Added	2015-01-05 14:28
Author	DAH

[Data]

Number	1128	Instrument: MST Radar. The transmitter for antenna sector C was out of action owing to an analogue error.
Start	2014-12-27 13:28
End	2014-12-30 12:47
Added	2015-01-05 14:27
Author	DAH

[Data]

Number	1127	Instrument: MST Radar. The radar was powered down during this period to allow LD to replace beam steering unit 15, which had been intermittently suffering from a low supply voltage (~ 0.3 V) since 2014-12-27 21:07 UT.
Start	2014-12-30 12:26
End	2014-12-30 12:47
Added	2015-01-05 12:44
Author	DAH

[Data]

Number	1131	Instrument: MST Radar. The radar suffered from varying degrees of interference during this period. This led to a reduction in useful altitude coverage for wind-profiling purposes.
Start	2015-01-05 07:00
End	2015-01-05 20:00
Added	2015-01-06 08:41
Author	DAH

[Data]

Number	1132	Instrument: UPS units. The units switched to battery power in respose to an input power problem. This occurred briefly (~1 s), twice in quick succession.
Start	2015-01-07 13:44
End	2015-01-07 13:44
Added	2015-01-08 08:40
Author	DAH

[Data]

Number	1133	Instrument: UPS units. The units switched briefly (~ 1 s) to battery power twice, within a few seconds in response to an input power problem.
Start	2015-01-14 22:20
End	2015-01-14 22:20
Added	2015-01-15 11:09
Author	DAH

[Data]

Number	1134	Instrument: UPS Units. Three of the six units switched to battery power briefly (~ 1 s) in response to an input power prpblem.
Start	2015-01-18 12:22
End	2015-01-18 12:22
Added	2015-01-19 09:01
Author	DAH

[Data]

Number	1136	Instrument: MST Radar. The radar suffered from a raised noise floor intermittently during this period. It was most prolonged during 2015-01-23 21:30 - 22:50 UT, 2015-01-24 22:10 - 2015-01-25 00:20 UT, 2015-01-25 08:20 - 09:50, 2015-01-25 11:40 - 12:50, 2015-01-25 18:30 - 19:40 UT. This is most evident in the mesospheric observations.
Start	2015-01-23 21:30
End	2015-01-26 09:03
Added	2015-01-26 09:14
Author	ZKO

[Data]

Number	1135	Instrument: UPS Units. The units switched to battery power briefly (~ 1 s) in response to an input power problem.
Start	2015-01-24 14:52
End	2015-01-24 14:52
Added	2015-01-26 09:03
Author	DAH

[Data]

Number	1137	Instrument: MST Radar. Two transmitters were out of action for most of this period owing to blown fuses. The transmitter for antenna sector B was out for the whole period and the one for sector C was out 2015-02-01 19:32 - 2015-02-02 14:24 UT.
Start	2015-02-01 13:26
End	2015-02-02 15:38
Added	2015-02-02 16:35
Author	DAH

[Data]

Number	1138	Instrument: MST Radar. The transmitter for antenna sector C was out of action owing to a blown fuse.
Start	2015-02-03 10:40
End	2015-02-04 10:15
Added	2015-02-04 11:48
Author	DAH

[Data]

Number	1139	Instrument: UPS units. The units switched to battery power briefly (~ 1 s) in response to an input power problem.
Start	2015-02-04 11:48
End	2015-02-04 11:48
Added	2015-02-04 11:50
Author	DAH

[Data]

Number	1140	Instrument: UPS Units. The units switched to battery power for approximately 6 s in response to an input power problem. TX4 is known (since 2015-03-19) to have at least 1 faulty battery unit and shut down its output power during this episode. The unit itself is in working order and resumed its output once mains power was restored.
Start	2015-03-29 14:43
End	2015-03-29 14:43
Added	2015-03-30 09:39
Author	DAH

[Data]

Number	1141	Instrument: MST Radar. The transmitter for antenna sector D (TX4) was out of action during this period. It had shut down when its UPS unit, which was known to have at least one faulty battery, powered down in response to an input power problem. Although the UPS unit quickly restored its output power, the transmitter remained in an idle state until DAH remotely restarted it on the following (Monday) morning.
Start	2015-03-29 14:44
End	2015-03-30 09:01
Added	2015-03-30 11:12
Author	DAH

[Data]

Number	1142	Instrument: MST Radar. The radar was powered down twice during this period for approximately 20 minutes on each occasion: 09:05 - 09:24 and 10:37 - 10:56 UT. The first time was to allow LD to change the beam steering unit for location 11. It had become unresponsive a few days earlier, at 2015-03-29 06:48 UT. LD found that one of the components had burnt out. Since he suspected that this was the result of water ingress, he stopped the radar a second time in order to water-proof the connecting cables of the replacement unit.
Start	2015-03-31 09:05
End	2015-03-31 10:56
Added	2015-03-31 14:19
Author	DAH

[Data]

Number	1143	Instrument: UPS Units. The units switched to battery power owing to a brief (~ 1 s) input power problem.
Start	2015-04-10 05:10
End	2015-04-10 05:10
Added	2015-04-10 09:32
Author	DAH

[Data]

Number	1144	Instrument: MST Radar. The transmitter for antenna sector D was out of action during this period. It shut down in response to a brief input power problem (the UPS unit for this transmitter is known to have a faulty battery). DAH was able to restart the transmitter remotely.
Start	2015-04-10 05:11
End	2015-04-10 07:27
Added	2015-04-10 11:21
Author	DAH

[Data]

Number	1145	Instrument: UPS unit for TX4. A new battery pack was installed in the UPS unit for the transmitter powering antenna sector D. The previous battery back was known to have been faulty since the self-test carried out on 2015-03-19.
Start	2015-04-10 10:19
End	2015-04-10 10:19
Added	2015-04-10 11:29
Author	DAH

[Data]

Number	1146	Instrument: MST Radar. The transmitter for antenna sector B was out of action with a blown HV fuse.
Start	2015-04-11 13:23
End	2015-04-14 09:19
Added	2015-04-16 09:17
Author	DAH

[Data]

Number	1147	Instrument: MST Radar. The transmitter for antenna sector B was out of action with a blown HV fuse.
Start	2015-04-14 16:55
End	2015-04-15 14:02
Added	2015-04-16 09:18
Author	DAH

[Data]

Number	1148	Instrument: Vaisala LD40 Ceilometer. The data acquisition software stopped logging messages from the instrument. DAH remotely restarted the software.
Start	2015-04-20 15:14
End	2015-04-21 07:19
Added	2015-04-21 08:46
Author	DAH

[Data]

Number	1149	Instrument: MST Radar. The transmitter for antenna section C was out of action with a blown HV fuse.
Start	2015-04-22 02:50
End	2015-04-22 08:55
Added	2015-04-28 14:03
Author	DAH

[Data]

Number	1150	Instrument: MST Radar. The transmitter for antenna sector B was out of action with a blown HV fuse.
Start	2015-04-27 10:30
End	2015-04-28 09:16
Added	2015-04-28 14:04
Author	DAH

[Data]

Number	1151	Instrument: MST Radar. The transmitter for antenna sector C was out of action with a blown HV fuse.
Start	2015-05-03 19:09
End	2015-05-05 09:27
Added	2015-05-05 10:33
Author	DAH

[Data]

Number	1152	Instrument: Vaisala LD40 Ceilometer. The data aquisition software unexpectedly stopped acquiring data and had to be restarted.
Start	2015-05-08 15:26
End	2015-05-11 08:58
Added	2015-05-12 09:19
Author	DAH

[Data]

Number	1153	Instrument: MST Radar. The transmitter for antenna sector D was out of action with a blown HV fuse.
Start	2015-05-11 19:14
End	2015-05-12 09:07
Added	2015-05-12 11:11
Author	DAH

[Data]

Number	1154	Instrument: MST Radar. The transmitter for antenna sector B was out of action with a blown fuse.
Start	2015-05-14 06:18
End	2015-05-14 09:37
Added	2015-05-14 15:08
Author	DAH

[Data]

Number	1157	Instrument: MST Radar. Beam steering unit 28 indicated a low supply voltage for a single dwell.
Start	2015-05-19 18:01
End	2015-05-19 18:02
Added	2015-06-29 10:00
Author	DAH

[Data]

Number	1155	Instrument: Vaisala LD40 Ceilometer. The data acqusition software stopped recording messages and had to be restarted.
Start	2015-05-20 15:37
End	2015-05-21 07:08
Added	2015-05-21 08:10
Author	DAH

[Data]

Number	1156	Instrument: MST Radar. The radar suffered from a short period of interference. This appears to have been filtered out by the quality control algorithms and so led to a gap in useful data rather than to contamination.
Start	2015-06-13 18:50
End	2015-06-13 19:50
Added	2015-06-15 16:15
Author	DAH

[Data]

Number	1158	INstrument: MST Radar. The transmitter for antenna sector C was out of action during this period owing to a blown HV fuse.
Start	2015-06-17 15:33
End	2015-06-18 09:44
Added	2015-06-29 10:02
Author	DAH

[Data]

Number	1837	Instrument: MST Radar. There is a small region, between altitudes of 8 and 9 km, where the wind speed from the v4 processing is unrealistically large. The Cardinal file has not been released to the archive.
Start	2015-06-19 18:40
End	2015-06-19 19:10
Added	2017-09-12 09:43
Author	DAH

[Data]

Number	1159	Instrument: MST Radar. The beam steering controller reported a system error: "Unknown response from interface controller". However, this did not appear to affect the performance of the radar.
Start	2015-06-25 03:14
End	2015-06-25 03:14
Added	2015-06-29 10:10
Author	DAH

[Data]

Number	1160	Instrument: Vaisala LD40. The data aquisition software on PC gaius stopped logging the data messages and had to be restarted.
Start	2015-06-25 15:19
End	2015-06-26 08:10
Added	2015-06-29 10:14
Author	DAH

[Data]

Number	1161	Instrument: MST Radar. The radar suffered from internal interference during some of this period. This resulted in gaps in the useful data rather than in contamination of the wind data.
Start	2015-06-26 11:45
End	2015-06-26 14:30
Added	2015-06-29 10:23
Author	DAH

[Data]

Number	1838	Instrument: MST Radar. The radar suffered from some sort of interference during this time, which has caused some contamination of the horizontal and vertical winds at the higher altitudes. The v4 Cardinal file has not been released to the archive.
Start	2015-06-26 12:40
End	2015-06-26 14:20
Added	2017-09-12 10:18
Author	DAH

[Data]

Number	1162	Instrument: MST Radar. The beam steering controller twice reported slightly higher than expected (> 2.5) VSWR values for unit 11: 09:52 - 10:28 UT and 10:32 - 10:59 UT.
Start	2015-06-30 09:52
End	2015-06-30 10:59
Added	2015-07-21 14:57
Author	DAH

[Data]

Number	1163	Instrument: MST Radar. The transmitter for antenna sector B was out of action during this period owing to a blown fuse.
Start	2015-07-02 23:30
End	2015-07-03 10:05
Added	2015-07-21 15:01
Author	DAH

[Data]

Number	1164	Instrument: MST Radar. The transmitter for antenna sector B was out of action during this period owing to a blown fuse.
Start	2015-07-03 12:07
End	2015-07-03 14:53
Added	2015-07-21 15:04
Author	DAH

[Data]

Number	1165	Instrument: MST Radar. The transmitter for antenna sector B was out of action during this period owing to a blown fuse.
Start	2015-07-04 16:27
End	2015-07-07 10:21
Added	2015-07-21 15:05
Author	DAH

[Data]

Number	1166	Instrument: MST Radar. The transmitter for antenna sector B was out of action during this period owing to a blown fuse.
Start	2015-07-07 13:10
End	2015-07-08 09:37
Added	2015-07-21 15:06
Author	DAH

[Data]

Number	1167	Instrument: MST Radar. The beam steering controller reported slightly higher than expected (> 2.5) VSWR values for unit 11 on four occasions: 10:14 - 11:12 UT, 11:57 - 12:02 UT, 12:16 - 12:21 UT, and 14:18 - 14:41 UT.
Start	2015-07-10 10:14
End	2015-07-10 14:41
Added	2015-07-21 16:14
Author	DAH

[Data]

Number	1168	Instrument: MST Radar. The transmitter for antenna sector B was out of action during this period owing to a blown fuse.
Start	2015-07-11 23:48
End	2015-07-14 10:06
Added	2015-07-21 16:17
Author	DAH

[Data]

Number	1169	Instrument: MST Radar. The transmitter for antenna sector B was out of action during this period owing to a blown fuse.
Start	2015-07-15 07:36
End	2015-07-16 09:35
Added	2015-07-21 16:18
Author	DAH

[Data]

Number	1170	Instrument: MST Radar. The beam steering controller reported slightly higher than expected (> 2.5) VSWR values for unit 11 on 5 occasions: 12:46 - 14:37 UT on 2015-07-17, 11:27 - 11:31 UT on 2015-07-18, 13:24 - 13:27 UT, 13:51 - 13:52 UT, and 14:06 - 14:19 UT.
Start	2015-07-17 12:46
End	2015-07-18 14:19
Added	2015-07-21 16:24
Author	DAH

[Data]

Number	1171	Instrument: MST Radar. The beam controller briefly (i.e. for one dwell) reported low output power for antenna sector B
Start	2015-07-21 10:38
End	2015-07-21 10:39
Added	2015-07-21 16:25
Author	ZKO

[Data]

Number	1172	Instrument: MST Radar. The beam steering controller reported slightly elevated (> 2.5) VSWR values for unit 11 during this period.
Start	2015-07-23 14:59
End	2015-07-23 15:04
Added	2015-08-04 09:36
Author	DAH

[Data]

Number	1173	Instrument: MST Radar. The beam steering controller reported slightly elevated (> 2.5) VSWR values for unit 11 twice during this period: 11:52 - 11:55, and 12:03 - 12:06 UT.
Start	2015-07-25 11:52
End	2015-07-25 12:06
Added	2015-08-04 09:58
Author	DAH

[Data]

Number	1174	Instrument: MST Radar. The transmitter for antenna sector B was out of action owing to a blown HV fuse.
Start	2015-07-25 12:46
End	2015-07-28 09:18
Added	2015-08-04 10:06
Author	DAH

[Data]

Number	1175	Instrument: MST Radar. The beam steering controller reported slightly elevated (> 2.5) VSWR values for unit 11 during this period.
Start	2015-07-28 15:33
End	2015-07-28 15:36
Added	2015-08-04 10:08
Author	DAH

[Data]

Number	1176	Instrument: MST Radar. The beam steering controller reported slightly elevated (> 2.5) VSWR values for unit 11 twice during this period: 13:51 - 13:52, and 15:09 - 15:10 UT.
Start	2015-07-29 13:51
End	2015-07-29 15:10
Added	2015-08-04 10:10
Author	DAH

[Data]

Number	1177	Instrument: MST Radar. The beam steering controller reported slightly elevated (> 2.5) VSWR values for unit 11 four times during this period: 13:45 - 13:50, 13:57 - 14:00, 14:25 - 14:26, and 15:07 - 15:15 UT.
Start	2015-07-30 13:45
End	2015-07-30 15:15
Added	2015-08-04 10:18
Author	DAH

[Data]

Number	1178	Instrument: MST Radar. The transmitters for antenna sectors A and/or B were out of action during this period. This resulted in significantly reduced altitude coverage. The transmitter for antenna sector A had an analogue error owing to the heater voltage dropping slightly below the expected range of 9.8 - 10.7 V. DAH was able to restart the transmitter remotely, but it only remained in action for a short period before shutting down again. This happened on many occasions until LD adjusted the measurement circuit in order to ensure a mid-range reading. During the period 2015-07-30 17:40 - 2015-08-03 15:50 UT, the transmitter was only in action 07:54 - 10:00 and 10:13 - 12:30 UT on 2015-07-31, and 07:22 - 09:13, 09:18 - 09:28, 09:31 - 09:33, 09:35 - 09:36, 09:37 - 09:48, 10:18 - 10:55, 10:56 - 11:08, 11:09 - 11:10, 11:13 - 11:16, 11:17 - 11:38, 12:38 - 13:35, 13:41 - 13:42, and 13:46 - 14:10 UT on 2015-08-03. The transmitter for antenna sector B was out of action 2015-08-01 09:20 - 2015-08-03 14:43 owing to a blown HV fuse.
Start	2015-07-30 17:40
End	2015-08-03 15:50
Added	2015-08-04 11:49
Author	DAH

[Data]

Number	1179	Instrument: MST Radar. The beam steering controller reported slightly elevated (> 2.5) VSWR values for unit 11 during this period.
Start	2015-07-31 12:18
End	2015-07-31 12:21
Added	2015-08-04 11:54
Author	DAH

[Data]

Number	1180	Instrument: MST Radar. The beam steering controller reported slightly elevated (> 2.5) VSWR values for unit 11 during this period.
Start	2015-08-03 11:15
End	2015-08-03 11:16
Added	2015-08-04 11:55
Author	DAH

[Data]

Number	1181	Instrument: MST Radar. The radar was powered down for a short period in order to allow beam steering unit 11 to be replaced. The existing unit had intermittently been reporting slightly elevated VSWR values in recent weeks.
Start	2015-08-04 10:37
End	2015-08-04 11:00
Added	2015-08-04 12:10
Author	DAH

[Data]

Number	1182	Instrument: MST Radar. The beam steering unit indicated the the output power from the transmitter for antenna sector A dipped below its minimum expected value on multiple occasions during this period. This does not appear to have a significant effect on altitude coverage.
Start	2015-08-07 21:02
End	2015-08-08 02:19
Added	2015-08-14 15:35
Author	DAH

[Data]

Number	1183	Instrument: MST Radar. The transmitter for antenna sector B was out of action during this period owing to a blown HV fuse.
Start	2015-08-08 04:49
End	2015-08-11 09:49
Added	2015-08-14 15:36
Author	DAH

[Data]

Number	1188	Instrument: MST Radar. The beam steering controller indicated that the forward power for the transmitter for antenna sector C was low for a single dwell.
Start	2015-08-09 02:22
End	2015-08-09 02:22
Added	2015-08-25 09:24
Author	DAH

[Data]

Number	1189	Instrument: MST Radar. The transmitter for antenna sector A was out of action during this period owing to an analogue error. The final heater voltage had dropped below its minimum expected value.
Start	2015-08-12 16:29
End	2015-08-13 07:05
Added	2015-08-25 09:29
Author	ZKO

[Data]

Number

1190

Instrument: MST Ra

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