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[Data]
Number9 A routine test of the MST Radar relays was conducted.
Start2002-07-30 00:00
End2002-07-30 00:00
Added2002-07-30 00:00
AuthorSJP

[Data]
Number10 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.
Start2002-08-27 00:00
End2002-08-27 00:00
Added2002-08-27 00:00
AuthorSJP

[Data]
Number12 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.
Start2002-10-01 00:00
End2002-10-02 00:00
Added2002-10-01 00:00
AuthorZKO

[Data]
Number13 On 31st October maintenance work was carried out on the site PC, which logs surface data, in order to replace a failed fan unit..
Start2002-10-31 00:00
End2002-10-31 00:00
Added2002-10-31 00:00
AuthorZKO

[Data]
Number14 A routine test and replacement of faulty relays.
Start2002-11-04 00:00
End2002-11-04 00:00
Added2002-11-04 00:00
AuthorZKO

[Data]
Number15 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.
Start2002-11-15 00:01
End2002-12-11 00:00
Added2002-11-15 00:00
AuthorZKO

[Data]
Number16 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.
Start2002-11-18 00:00
End2002-11-18 00:00
Added2002-11-18 00:00
AuthorZKO

[Data]
Number17 A successful switch-over of BUFR file transmission to the new system was carried out on 11th December.
Start2002-12-11 00:00
End2002-12-11 00:00
Added2002-12-11 00:00
AuthorZKO

[Data]
Number18 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.
Start2002-12-17 00:00
End2002-12-17 00:00
Added2002-12-17 00:00
AuthorZKO

[Data]
Number19 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.
Start2002-12-28 00:00
End2002-12-28 00:00
Added2002-12-28 00:00
AuthorZKO

[Data]
Number20 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.
Start2003-01-12 16:30
End2003-01-13 09:30
Added2003-01-12 00:00
AuthorZKO

[Data]
Number21 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.
Start2003-01-13 00:00
End2003-01-13 00:00
Added2003-01-13 00:00
AuthorZKO

[Data]
Number27 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.
Start2003-04-01 00:00
End2003-10-16 00:00
Added2005-08-01 16:23
AuthorZKO

[Data]
Number26 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.
Start2003-04-03 00:00
End2003-04-14 00:00
Added2005-08-01 16:19
AuthorZKO

[Data]
Number29 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.
Start2003-06-16 00:00
End2003-06-16 00:00
Added2005-08-01 16:35
AuthorZKO

[Data]
Number22 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.
Start2003-07-09 00:00
End2003-07-09 00:00
Added2005-08-01 16:08
AuthorZKO

[Data]
Number23 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.
Start2003-07-19 06:00
End2003-07-21 09:00
Added2005-08-01 16:10
AuthorZKO

[Data]
Number28 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.
Start2003-07-25 00:00
End2003-07-25 00:00
Added2005-08-01 16:34
AuthorZKO

[Data]
Number24 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.
Start2003-07-26 00:00
End2003-07-28 09:00
Added2005-08-01 16:17
AuthorZKO

[Data]
Number25 The radar was down for approximately 10 minutes on 27th August after a minor disruption of the mains electricity supply to the site.
Start2003-08-27 00:00
End2003-08-27 00:00
Added2005-08-01 16:17
AuthorZKO

[Data]
Number38 Dr Prabhakaran Nayar, from the University of Kerala, India visited the radar site on 20th October 2003.
Start2003-10-20 00:00
End2003-10-20 00:00
Added2005-08-01 16:52
AuthorZKO

[Data]
Number32 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.
Start2003-10-21 10:30
End2003-10-21 12:40
Added2005-08-01 16:46
AuthorZKO

[Data]
Number30 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.
Start2003-10-30 00:00
End2003-10-30 00:00
Added2005-08-01 16:38
AuthorZKO

[Data]
Number36 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.
Start2003-11-06 00:00
End2003-11-06 00:00
Added2005-08-01 16:49
AuthorZKO

[Data]
Number33 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.
Start2003-11-06 00:00
End2003-11-06 00:00
Added2005-08-01 16:47
AuthorZKO

[Data]
Number34 NERC Site survey.
Start2003-11-06 00:00
End2003-11-06 00:00
Added2005-08-01 16:48
AuthorZKO

[Data]
Number31 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.
Start2003-11-07 13:00
End2003-11-11 13:00
Added2005-08-01 16:40
AuthorZKO

[Data]
Number37 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.
Start2003-11-19 00:00
End2003-12-02 00:00
Added2005-08-01 16:52
AuthorZKO

[Data]
Number35 NERC asbestos check.
Start2003-11-20 00:00
End2003-11-20 00:00
Added2005-08-01 16:48
AuthorZKO

[Data]
Number40 Site manager away visiting the MO's new VHF wind-profiler at South Uist (Outer Hebrides) from 26th to 28th November 2003.
Start2003-11-26 00:00
End2003-11-28 00:00
Added2005-08-01 16:54
AuthorZKO

[Data]
Number39 Dr Adrian McDonald, from the University of Canterbury, New Zealand, visited the site on 12th December 2003.
Start2003-12-12 00:00
End2003-12-12 00:00
Added2005-08-01 16:53
AuthorZKO

[Data]
Number41 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.
Start2004-01-28 00:00
End2004-01-28 00:00
Added2005-08-01 16:56
AuthorZKO

[Data]
Number44 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.
Start2004-02-05 00:00
End2004-02-09 00:00
Added2005-08-01 16:59
AuthorZKO

[Data]
Number45 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.
Start2004-02-15 00:00
End2004-02-15 00:00
Added2005-08-01 17:01
AuthorZKO

[Data]
Number42 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.
Start2004-02-16 00:00
End2004-02-16 00:00
Added2005-08-01 16:57
AuthorZKO

[Data]
Number46 The new UFAM mobile laboratory arrived at the radar site on 16th February 2004. It will be stored there in-between campaigns.
Start2004-02-16 00:00
End2004-02-16 00:00
Added2005-08-01 17:02
AuthorZKO

[Data]
Number43 ZAKO attended a NERC Safety Responsibility and Risk Management course in Swindon on 17th and 18th February 2004.
Start2004-02-17 00:00
End2004-02-18 00:00
Added2005-08-01 16:57
AuthorZKO

[Data]
Number47 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.
Start2004-03-16 00:00
End2004-03-16 00:00
Added2005-08-01 17:02
AuthorZKO

[Data]
Number48 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.
Start2004-03-20 00:00
End2004-03-22 00:00
Added2005-08-01 17:03
AuthorZKO

[Data]
Number49 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.
Start2004-04-08 00:00
End2004-04-08 00:00
Added2005-08-01 17:04
AuthorZKO

[Data]
Number50 On 20th April 2004 the UFAM boundary-layer wind-profiler was taken to Weybourne to participate in the TORCH campaign.
Start2004-04-20 00:00
End2004-04-20 00:00
Added2005-08-01 17:05
AuthorZKO

[Data]
Number51 On 29th April 2004 Jonathan Jones (from the MO) replaced the computer for the GPS water vapour receiver.
Start2004-04-29 00:00
End2004-04-29 00:00
Added2005-08-01 17:05
AuthorZKO

[Data]
Number52 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.
Start2004-05-20 00:00
End2004-05-20 00:00
Added2005-08-01 17:06
AuthorZKO

[Data]
Number53 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.
Start2004-05-25 00:00
End2004-05-25 00:00
Added2005-08-01 17:07
AuthorZKO

[Data]
Number54 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.
Start2004-06-01 13:30
End2004-06-03 10:30
Added2005-08-01 17:09
AuthorZKO

[Data]
Number55 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.
Start2004-06-21 00:00
End2004-06-21 00:00
Added2005-08-02 13:07
AuthorZKO

[Data]
Number56 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.
Start2004-06-28 00:00
End2004-06-28 00:00
Added2005-08-02 13:07
AuthorZKO

[Data]
Number60 ZAKO carried out work on the antenna array.
Start2004-07-02 00:00
End2004-07-02 00:00
Added2005-08-02 13:17
AuthorZKO

[Data]
Number61 ZAKO carried out work on the antenna array
Start2004-07-03 00:00
End2004-07-03 00:00
Added2005-08-02 13:17
AuthorZKO

[Data]
Number57 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.
Start2004-07-04 08:05
End2004-07-05 08:00
Added2005-08-02 13:09
AuthorZKO

[Data]
Number62 ZAKO carried out work on the antenna array
Start2004-07-10 00:00
End2004-07-10 00:00
Added2005-08-02 13:17
AuthorZKO

[Data]
Number58 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.
Start2004-07-12 00:00
End2004-07-12 00:00
Added2005-08-02 13:10
AuthorZKO

[Data]
Number63 ZAKO carried out work on the antenna array
Start2004-07-13 00:00
End2004-07-13 00:00
Added2005-08-02 13:18
AuthorZKO

[Data]
Number59 The tipping bucket raingauge was cleaned on 19th July to clear fungus which was preventing the device from registering rain.
Start2004-07-19 00:00
End2004-07-19 00:00
Added2005-08-02 13:11
AuthorZKO

[Data]
Number64 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.
Start2004-08-16 23:30
End2004-08-17 08:35
Added2005-08-02 13:19
AuthorZKO

[Data]
Number65 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.
Start2004-08-18 12:35
End2004-08-18 14:05
Added2005-08-02 13:20
AuthorZKO

[Data]
Number67 Dyfed Alarms carried out a 6-monthly check on the site alarms, including the panic alarm, on 19th August.
Start2004-08-19 00:00
End2004-08-19 00:00
Added2005-08-02 13:21
AuthorZKO

[Data]
Number66 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.
Start2004-08-19 00:00
End2004-08-19 14:00
Added2005-08-02 13:21
AuthorZKO

[Data]
Number68 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.
Start2004-08-24 00:00
End2004-08-25 00:00
Added2005-08-02 13:22
AuthorZKO

[Data]
Number69 The tipping bucket raingauge had to be cleaned again on 25th August because of blockage by fungus.
Start2004-08-25 00:00
End2004-08-25 00:00
Added2005-08-02 13:23
AuthorZKO

[Data]
Number70 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.
Start2004-09-07 22:00
End2004-09-08 12:00
Added2005-08-02 13:26
AuthorZKO

[Data]
Number71 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.
Start2004-09-14 15:00
End2004-09-14 15:20
Added2005-08-02 13:27
AuthorZKO

[Data]
Number72 On 21st September ZAKO had to take action to remove a virus infection from the Logger PC.
Start2004-09-21 00:00
End2004-09-21 00:00
Added2005-08-02 13:27
AuthorZKO

[Data]
Number73 Jonathan Jones, from the Met Office, visited the site on 1st October in order to change the PC on the GPS water vapour receiver.
Start2004-10-01 00:00
End2004-10-01 00:00
Added2005-08-02 13:28
AuthorZKO

[Data]
Number74 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.
Start2004-10-04 07:26
End2004-10-04 07:55
Added2005-08-02 13:29
AuthorZKO

[Data]
Number75 ZAKO cleaned out the tipping bucket raingauge on 7th October.
Start2004-10-07 00:00
End2004-10-07 00:00
Added2005-08-02 13:29
AuthorZKO

[Data]
Number76 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.
Start2004-10-14 00:00
End2004-10-14 00:00
Added2005-08-02 13:30
AuthorZKO

[Data]
Number77 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.
Start2004-10-19 08:45
End2004-10-19 15:15
Added2005-08-02 13:31
AuthorZKO

[Data]
Number78 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.
Start2004-10-21 16:00
End2004-10-22 07:15
Added2005-08-02 13:32
AuthorZKO

[Data]
Number79 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.
Start2004-10-28 00:00
End2004-10-29 00:00
Added2005-08-02 13:33
AuthorZKO

[Data]
Number80 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.
Start2004-11-11 18:30
End2004-11-11 21:30
Added2005-08-02 13:34
AuthorZKO

[Data]
Number81 A Hercules aircraft flew very low over the radar site, from west to east, at around 1300 UT on 13th November.
Start2004-11-13 13:00
End2004-11-13 13:00
Added2005-08-02 13:35
AuthorZKO

[Data]
Number82 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.
Start2004-11-15 13:45
End2004-11-15 17:15
Added2005-08-02 13:37
AuthorZKO

[Data]
Number83 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.
Start2004-11-17 14:45
End2004-11-18 12:30
Added2005-08-02 13:38
AuthorZKO

[Data]
Number84 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.
Start2004-11-18 00:00
End2004-11-18 12:00
Added2005-08-02 13:38
AuthorZKO

[Data]
Number85 The radar was down from 1550 - 1605 on 18th November in order to allow ZAKO to carry out an inspection of the field boxes.
Start2004-11-18 15:50
End2004-11-18 16:05
Added2005-08-02 13:39
AuthorZKO

[Data]
Number86 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.
Start2004-11-23 11:00
End2004-11-23 14:00
Added2005-08-02 13:41
AuthorZKO

[Data]
Number87 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.
Start2004-11-24 00:00
End2004-11-30 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number88 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.
Start2004-11-30 12:45
End2004-11-30 15:45
Added2005-08-02 13:46
AuthorZKO

[Data]
Number89 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.
Start2004-12-15 00:00
End2004-12-15 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number90 The MO's GPS water vapour receiver PC was rebooted on 17th December.
Start2004-12-17 00:00
End2004-12-17 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number92 A fault caused the site alarm to go off at 07 UT on 24th December. Dyfed alarms changed a sensor in the lounge area.
Start2004-12-24 07:00
End2004-12-24 07:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number91 The MO's GPS water vapour receiver PC was rebooted on 29th December.
Start2004-12-29 00:00
End2004-12-29 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number93 A non-locking transmitter went down during the night of 3rd/4th January 2005. This was fixed by 09 UT on 4th January.
Start2005-01-03 20:00
End2005-01-04 09:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number94 The timber next to the smaller of the two site sheds was collected for disposal on 6th and 11th January.
Start2005-01-06 00:00
End2005-01-11 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number95 The new Anritsu cable testing unit arrived at the site on 12th January.
Start2005-01-12 00:00
End2005-01-12 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number96 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.
Start2005-01-14 12:00
End2005-01-15 19:30
Added2005-08-02 13:45
AuthorZKO

[Data]
Number97 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.
Start2005-01-22 08:00
End2005-01-23 10:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number98 Some work was carried out in the field on 26th January. This did not require the radar to be shut down.
Start2005-01-26 00:00
End2005-01-26 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number99 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.
Start2005-01-27 07:30
End2005-01-27 09:45
Added2005-08-02 13:45
AuthorZKO

[Data]
Number100 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.
Start2005-02-07 00:00
End2005-02-15 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number101 15th February. The PC controlling the MO's GPS water vapour receiver also required reboot.
Start2005-02-15 00:00
End2005-02-15 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number102 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.
Start2005-02-16 00:00
End2005-02-16 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number103 Katie Abbott, from NERC, visited the site on 22nd February in order to carry out a site survey.
Start2005-02-22 00:00
End2005-02-22 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number104 Field work was carried out on 23rd and 24th February. This did not require the radar to be powered down.
Start2005-02-23 00:00
End2005-02-24 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number105 UofWA fire officer visited the site on 28th February in order to carry out checks on the fire extinguishers. No problems were found.
Start2005-02-28 00:00
End2005-02-28 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number106 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.
Start2005-03-01 11:45
End2005-03-01 12:45
Added2005-08-02 13:45
AuthorZKO

[Data]
Number107 Work on the relays was carried out on 2nd and 3rd March. This did not require any down time.
Start2005-03-02 00:00
End2005-03-03 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number108 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.
Start2005-03-04 08:50
End2005-03-04 11:45
Added2005-08-02 13:45
AuthorZKO

[Data]
Number109 The MST radar was down 12:45 - 18:15 UT on 9th March to allow work to be carried out on the field relays.
Start2005-03-09 12:45
End2005-03-09 18:15
Added2005-08-02 13:45
AuthorZKO

[Data]
Number110 The MST radar was down 13:00 - 15:45 UT on 10th March to allow work to be carried out on the field relays.
Start2005-03-10 13:00
End2005-03-10 15:45
Added2005-08-02 13:45
AuthorZKO

[Data]
Number111 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.
Start2005-03-11 00:00
End2005-03-11 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number112 The MST radar was down 11:30 - 15:30 on 14th March to allow the replacement of some relays.
Start2005-03-14 15:30
End2005-03-14 15:30
Added2005-08-02 13:45
AuthorZKO

[Data]
Number113 The RAL cloud radar arrived at the MST site, direct from its recent field campaign in Mauritius, on 16th March.
Start2005-03-16 00:00
End2005-03-16 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number114 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.
Start2005-03-17 11:30
End2005-03-17 15:30
Added2005-08-02 13:45
AuthorZKO

[Data]
Number115 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.
Start2005-03-18 09:00
End2005-03-18 16:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number117 31st March - The surface met data logger, and sensors, arrived back from Campbell Scientific.
Start2005-03-31 00:00
End2005-03-31 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number116 One of the MST radar transmitters went down at around 08:30 UT on 31st March, but was repaired by 09:15 UT.
Start2005-03-31 08:30
End2005-03-31 09:15
Added2005-08-02 13:45
AuthorZKO

[Data]
Number118 The data logger and met sensors (apart from the replacement pressure sensor) were reinstalled on 5th April.
Start2005-04-05 00:00
End2005-04-05 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number119 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.
Start2005-04-06 00:00
End2005-04-07 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number120 DAH installed "Nero", the new WindowsXP data logging PC, on 13th April. The old PC was taken back to RAL for disinfection.
Start2005-04-13 00:00
End2005-04-13 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number121 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.
Start2005-04-14 00:00
End2005-04-14 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number122 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.
Start2005-04-14 00:00
End2005-04-14 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number123 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.
Start2005-04-16 11:00
End2005-04-16 12:45
Added2005-08-02 13:45
AuthorZKO

[Data]
Number124 The tipping bucket raingauge was cleaned out at 14:30 UT on 18th April.
Start2005-04-18 14:30
End2005-04-18 14:30
Added2005-08-02 13:45
AuthorZKO

[Data]
Number126 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.
Start2005-04-22 00:00
End2005-05-04 08:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number125 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.
Start2005-04-22 14:00
End2005-04-25 08:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number127 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.
Start2005-05-05 00:00
End2005-05-10 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number128 The grass was cut on 12th May.
Start2005-05-12 00:00
End2005-05-12 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number129 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.
Start2005-05-20 12:00
End2005-05-20 19:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number130 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.
Start2005-05-22 00:00
End2005-05-22 08:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number131 One of the MST radar transmitters (a non-locking one) went down overnight on 1st June and was restarted in the morning.
Start2005-06-01 00:00
End2005-06-01 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number132 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.
Start2005-06-01 00:00
End2005-06-06 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number133 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.
Start2005-06-08 12:30
End2005-06-08 16:45
Added2005-08-02 13:45
AuthorZKO

[Data]
Number134 ZAKO carried out work in the field on 10th and 14th June. There was no need to power down the MST radar.
Start2005-06-10 00:00
End2005-06-14 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number135 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.
Start2005-06-16 00:00
End2005-06-16 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number136 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.
Start2005-06-17 00:00
End2005-06-17 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number137 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.
Start2005-06-18 00:00
End2005-06-18 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number138 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.
Start2005-06-19 19:00
End2005-06-20 08:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number139 ZAKO carried out work on the MST antennas on 23rd June. This did not require the radar to be powered down.
Start2005-06-23 00:00
End2005-06-23 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number140 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.
Start2005-06-28 17:15
End2005-06-29 07:30
Added2005-08-02 13:45
AuthorZKO

[Data]
Number141 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.
Start2005-07-01 00:00
End2005-07-01 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number142 The cloud radar was placed on the new instrument platform and restarted around 15:45 UT on 4th July.
Start2005-07-04 15:45
End2005-07-04 15:45
Added2005-08-02 13:45
AuthorZKO

[Data]
Number143 The grass was cut on 5th July.
Start2005-07-05 00:00
End2005-07-05 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number144 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.
Start2005-07-08 09:00
End2005-07-08 10:15
Added2005-08-02 13:45
AuthorZKO

[Data]
Number145 Weed spraying was carried out on 9th July.
Start2005-07-09 00:00
End2005-07-09 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number146 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.
Start2005-07-15 00:00
End2005-07-15 00:00
Added2005-08-02 13:45
AuthorZKO

[Data]
Number252 Instrument: MST Radar. There was a short break in observations to allow the radar control and data acquisition PC to be rebooted.
Start2006-04-03 12:10
End2006-04-03 12:15
Added2007-05-16 09:56
AuthorDAH

[Data]
Number253 Instrument: MST Radar. There was a short break in observations to allow the radar control and data acquisition PC to be rebooted.
Start2006-04-13 09:45
End2006-04-13 09:50
Added2007-05-16 09:57
AuthorDAH

[Data]
Number254 Instrument: MST Radar. There was a short gap in observations to allow the radar control and data acquisition PC to be rebooted.
Start2006-04-20 08:55
End2006-04-20 09:10
Added2007-05-16 09:59
AuthorDAH

[Data]
Number255 Instrument: MST Radar. There was a short gap in observations to allow the radar control and data acquisition PC to be rebooted.
Start2006-05-01 10:05
End2006-05-01 10:10
Added2007-05-16 10:01
AuthorDAH

[Data]
Number256 Instrument: MST Radar. There was a short gap in observations to allow the radar control and data acquisition PC to be rebooted.
Start2006-05-11 18:55
End2006-05-11 19:00
Added2007-05-16 10:02
AuthorDAH

[Data]
Number175 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.
Start2006-05-26 21:40
End2006-05-27 11:40
Added2006-09-06 10:14
AuthorDAH

[Data]
Number257 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.
Start2006-06-05 18:10
End2006-06-06 08:10
Added2007-05-16 10:07
AuthorDAH

[Data]
Number258 Instrument: MST Radar. There was a short gap in observations to allow the radar control and data acquisition PC to be rebooted.
Start2006-06-16 14:00
End2006-06-16 14:05
Added2007-05-16 10:07
AuthorDAH

[Data]
Number259 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.
Start2006-06-27 05:10
End2006-06-27 08:20
Added2007-05-16 10:11
AuthorDAH

[Data]
Number260 Instrument: MST Radar. The radar and all computers were powered down to allow DAH and ZAKO to re-arrange equipment.
Start2006-06-28 13:10
End2006-06-28 14:10
Added2007-05-16 10:12
AuthorDAH

[Data]
Number261 Instrument: MST Radar. The radar was powered down because of thunderstorms in the Capel Dewi area. It was restarted the following morning.
Start2006-07-02 20:45
End2006-07-03 07:10
Added2007-05-16 10:19
AuthorDAH

[Data]
Number262 Instrument: MST Radar. The radar stopped function owing to a thunderstorm in the Capel Dewi area.
Start2006-07-04 17:10
End2006-07-04 18:20
Added2007-05-16 10:21
AuthorDAH

[Data]
Number263 Instrument: MST Radar. The radar was shut down because of thunderstorms in the Capel Dewi area.
Start2006-07-05 15:40
End2006-07-05 19:10
Added2007-05-16 10:23
AuthorDAH

[Data]
Number264 Instrument: MST Radar. There was a short gap in observations to allow the radar control and data acquisition PC to be rebooted.
Start2006-07-14 14:00
End2006-07-14 14:05
Added2007-05-16 10:27
AuthorDAH

[Data]
Number265 Instrument: MST Radar. There was a short gap in observations to allow the radar control and data acquisition PC to be rebooted.
Start2006-07-24 07:45
End2006-07-24 07:55
Added2007-05-16 10:29
AuthorDAH

[Data]
Number149 Instrument: MST Radar. ZAKO rebooted the radar control and data acquisition PC.
Start2006-07-24 07:50
End2006-07-24 07:50
Added2006-07-31 09:39
AuthorDAH

[Data]
Number152 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.
Start2006-07-26 00:00
End2006-07-31 11:00
Added2006-08-01 15:38
AuthorDAH

[Data]
Number148 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.
Start2006-07-26 11:00
End2006-07-26 18:00
Added2006-07-27 08:43
AuthorDAH

[Data]
Number147 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.
Start2006-07-26 15:57
End2006-07-26 15:57
Added2006-07-26 16:01
AuthorDAH

[Data]
Number150 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.
Start2006-07-28 10:00
End2006-07-28 11:00
Added2006-07-31 09:43
AuthorDAH

[Data]
Number151 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.
Start2006-07-28 18:00
End2006-07-28 18:00
Added2006-07-31 09:46
AuthorDAH

[Data]
Number153 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.
Start2006-08-01 09:30
End2006-08-01 15:00
Added2006-08-02 08:24
AuthorDAH

[Data]
Number154 Instrument: MST Radar. The radar control and data acquisition PC was rebooted around 15:30 UT.
Start2006-08-01 15:30
End2006-08-01 15:40
Added2006-08-02 09:33
AuthorDAH

[Data]
Number155 Instrument: MST Radar. Mild interference occurred between 00:00 and 02:30 UT and then again between 17:00 and 18:30 UT.
Start2006-08-02 00:00
End2006-08-02 18:30
Added2006-08-04 08:30
AuthorDAH

[Data]
Number156 Instrument: MST Radar. Mild interference occurred between 04:00 and 06:00 UT and then again between 15:00 and 16:00 UT.
Start2006-08-03 04:00
End2006-08-03 16:00
Added2006-08-04 08:32
AuthorDAH

[Data]
Number157 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.
Start2006-08-05 17:20
End2006-08-05 21:10
Added2006-08-07 08:54
AuthorDAH

[Data]
Number158 Instrument: MST Radar. Interference was experienced in a similar pattern to that of the revious day (2006/08/05).
Start2006-08-06 02:00
End2006-08-06 09:10
Added2006-08-07 08:57
AuthorDAH

[Data]
Number159 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.
Start2006-08-07 06:00
End2006-08-07 23:59
Added2006-08-08 08:43
AuthorDAH

[Data]
Number160 Instrument: MST Radar. The new (type-2) interference continued over from the previous day until around 00:40 UT.
Start2006-08-08 00:00
End2006-08-08 00:40
Added2006-08-09 09:21
AuthorDAH

[Data]
Number161 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.
Start2006-08-08 09:30
End2006-08-08 09:45
Added2006-08-09 09:21
AuthorDAH

[Data]
Number162 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.
Start2006-08-10 00:00
End2006-08-10 08:00
Added2006-08-10 09:46
AuthorDAH

[Data]
Number163 Instrument: MST Radar. The radar control and data acquisition PC was rebooted resulting in a small loss of coverage.
Start2006-08-10 15:30
End2006-08-10 15:40
Added2006-08-15 09:26
AuthorDAH

[Data]
Number164 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.
Start2006-08-14 00:00
End2006-08-14 08:00
Added2006-08-15 09:30
AuthorDAH

[Data]
Number165 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.
Start2006-08-16 10:00
End2006-08-16 11:00
Added2006-08-17 12:35
AuthorDAH

[Data]
Number166 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.
Start2006-08-17 10:03
End2006-08-17 10:03
Added2006-08-17 12:37
AuthorDAH

[Data]
Number266 Atmospheric. A thunderstorm passed over the radar site. The radar was not powered down and so there was no loss of observations.
Start2006-08-18 08:40
End2006-08-18 08:40
Added2007-05-16 11:48
AuthorDAH

[Data]
Number167 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.
Start2006-08-21 16:00
End2006-08-21 17:45
Added2006-08-22 09:23
AuthorDAH

[Data]
Number169 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.
Start2006-08-22 10:55
End2006-08-22 12:40
Added2006-08-23 09:19
AuthorDAH

[Data]
Number168 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.
Start2006-08-22 15:25
End2006-08-24 09:00
Added2006-08-23 09:10
AuthorDAH

[Data]
Number170 Instrument: MST Radar. Observations were interrupted for approximately 5 minutes to allow the radar control and data acquistion computer to be re-booted.
Start2006-09-01 13:20
End2006-09-01 13:25
Added2006-09-04 11:11
AuthorDAH

[Data]
Number172 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.
Start2006-09-04 08:00
End2006-09-04 10:00
Added2006-09-06 10:01
AuthorDAH

[Data]
Number171 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.
Start2006-09-04 13:20
End2006-09-04 17:40
Added2006-09-05 08:32
AuthorDAH

[Data]
Number174 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.
Start2006-09-05 05:00
End2006-09-05 12:00
Added2006-09-06 10:06
AuthorDAH

[Data]
Number173 Instrument: MST Radar. The radar appears to have experienced mild interference. However, this is only apparent in the M-mode data.
Start2006-09-05 11:30
End2006-09-05 12:00
Added2006-09-06 10:03
AuthorDAH

[Data]
Number177 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.
Start2006-09-06 09:15
End2006-09-06 09:15
Added2006-09-08 08:58
AuthorDAH

[Data]
Number176 Instrument: MST Radar. ZAKO rebooted the radar control and data acquisition PC leading to a short gap in observations.
Start2006-09-06 14:15
End2006-09-06 14:20
Added2006-09-07 09:51
AuthorDAH

[Data]
Number178 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.
Start2006-09-09 05:00
End2006-09-09 05:30
Added2006-09-12 08:40
AuthorDAH

[Data]
Number182 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.
Start2006-09-11 15:30
End2006-09-19 11:00
Added2006-09-19 15:11
AuthorDAH

[Data]
Number179 Instrument: MST Radar. ZAKO rebooted the radar control and data acquisition PC resulting in a short period of no observations being made.
Start2006-09-15 14:40
End2006-09-15 14:45
Added2006-09-19 12:21
AuthorDAH

[Data]
Number180 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.
Start2006-09-17 21:20
End2006-09-17 22:30
Added2006-09-19 12:26
AuthorZKO

[Data]
Number181 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.
Start2006-09-18 17:30
End2006-09-18 19:20
Added2006-09-19 12:37
AuthorDAH

[Data]
Number183 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.
Start2006-09-19 08:00
End2006-09-19 09:00
Added2006-09-21 14:35
AuthorDAH

[Data]
Number184 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.
Start2006-09-21 10:00
End2006-09-21 20:00
Added2006-09-22 09:53
AuthorDAH

[Data]
Number186 Instrument: Wind Sensors. DAH synchronised the clock on the Frongoch data logger, which had been running approximately 1 minute late.
Start2006-09-21 11:00
End2006-09-21 11:00
Added2006-09-22 10:17
AuthorDAH

[Data]
Number230 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.
Start2006-09-21 13:00
End2006-09-21 21:00
Added2007-01-30 09:31
AuthorDAH

[Data]
Number189 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).
Start2006-09-22 10:03
End2006-09-22 19:43
Added2006-09-26 08:34
AuthorDAH

[Data]
Number185 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.
Start2006-09-22 10:07
End2006-09-22 10:07
Added2006-09-22 10:10
AuthorDAH

[Data]
Number187 Instrument: MST Radar. The radar experienced some interference which led to mild contamination of v2 data.
Start2006-09-24 02:00
End2006-09-24 04:00
Added2006-09-25 09:38
AuthorDAH

[Data]
Number188 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.
Start2006-09-25 19:30
End2006-09-25 23:59
Added2006-09-26 08:23
AuthorDAH

[Data]
Number190 Instrument: MST Radar. The radar control and data acquisition PC was rebooted, leading to a short gap in observations.
Start2006-09-26 08:20
End2006-09-26 08:30
Added2006-09-27 08:33
AuthorDAH

[Data]
Number191 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.
Start2006-09-26 13:40
End2006-09-26 14:20
Added2006-09-27 08:39
AuthorDAH

[Data]
Number192 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.
Start2006-09-27 21:40
End2006-09-27 23:59
Added2006-09-28 08:31
AuthorDAH

[Data]
Number193 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.
Start2006-09-28 19:00
End2006-09-28 21:20
Added2006-09-29 08:22
AuthorDAH

[Data]
Number267 Atmospheric. There was a brief period of heavy rain.
Start2006-09-29 09:30
End2006-09-29 09:30
Added2007-05-16 11:57
AuthorDAH

[Data]
Number198 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.
Start2006-09-29 11:01
End2006-09-29 17:38
Added2006-10-05 08:45
AuthorDAH

[Data]
Number194 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.
Start2006-09-30 18:30
End2006-09-30 19:30
Added2006-10-02 09:00
AuthorDAH

[Data]
Number195 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.
Start2006-10-01 09:40
End2006-10-01 17:00
Added2006-10-02 09:05
AuthorDAH

[Data]
Number196 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.
Start2006-10-02 09:50
End2006-10-02 18:00
Added2006-10-05 08:29
AuthorDAH

[Data]
Number197 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.
Start2006-10-04 01:30
End2006-10-04 23:59
Added2006-10-05 08:34
AuthorDAH

[Data]
Number199 Instrument: MST Radar. The radar experienced a short period of interference. The v2 data show mild contamination.
Start2006-10-05 06:00
End2006-10-05 07:20
Added2006-10-09 09:21
AuthorDAH

[Data]
Number200 Instrument: MST Radar. The radar control and data acqusition PC was rebooted leading to a short gap in observations.
Start2006-10-06 11:25
End2006-10-06 11:35
Added2006-10-09 09:23
AuthorDAH

[Data]
Number201 Instrument: MST Radar. The radar experienced a short period of interference. V2 data show only mild contamination.
Start2006-10-06 21:50
End2006-10-06 23:00
Added2006-10-09 09:24
AuthorDAH

[Data]
Number202 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.
Start2006-10-07 07:00
End2006-10-07 15:00
Added2006-10-09 09:29
AuthorDAH

[Data]
Number203 Instrument: MST Radar. The radar experienced a period of interference. This appears to have caused mild contamination of the v0 and v2 data.
Start2006-10-08 13:00
End2006-10-08 15:00
Added2006-10-09 09:31
AuthorDAH

[Data]
Number204 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.
Start2006-10-09 00:00
End2006-10-09 14:30
Added2006-10-17 08:36
AuthorDAH

[Data]
Number268 Atmospheric. ZAKO reported that a thunderstorm passed over (at an unspecified time) during the early hours of the morning.
Start2006-10-11 00:00
End2006-10-11 06:00
Added2007-05-16 12:02
AuthorDAH

[Data]
Number205 Instrument: MST Radar. The radar control and data acquisition PC was rebooted at 09:00 UT leading to a short gap in observations.
Start2006-10-16 09:00
End2006-10-16 09:10
Added2006-10-17 08:37
AuthorDAH

[Data]
Number206 Instrument: MST Radar. The radar control and data acquisition PC was rebooted at 09:00 UT leading to a short gap in observations.
Start2006-10-16 09:00
End2006-10-16 09:10
Added2006-10-17 12:05
AuthorDAH

[Data]
Number207 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.
Start2006-10-18 10:01
End2006-10-19 07:08
Added2006-10-19 08:13
AuthorDAH

[Data]
Number208 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.
Start2006-10-20 17:30
End2006-10-21 12:00
Added2006-10-23 08:43
AuthorDAH

[Data]
Number269 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.
Start2006-10-21 14:50
End2006-10-21 18:00
Added2007-05-16 12:12
AuthorDAH

[Data]
Number209 Instrument: MST Radar. The radar experienced a short period of mild interference. It appears to have caused only minor contamination of v2 data.
Start2006-10-23 13:30
End2006-10-23 14:30
Added2006-10-27 08:33
AuthorDAH

[Data]
Number210 Instrument: MST Radar. ZAKO rebooted the radar control and data acquisition PC leading to a small gap in observations.
Start2006-10-26 08:30
End2006-10-26 08:40
Added2006-10-27 08:35
AuthorDAH

[Data]
Number211 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.
Start2006-11-04 10:00
End2006-11-05 16:54
Added2006-11-06 09:59
AuthorDAH

[Data]
Number212 Instrument: MST Radar. ZAKO rebooted the radar control and data acquisition PC leading to a short gap in observations.
Start2006-11-06 09:15
End2006-11-06 09:20
Added2006-11-08 08:23
AuthorDAH

[Data]
Number213 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.
Start2006-11-09 10:00
End2006-11-10 08:15
Added2006-11-10 08:18
AuthorDAH

[Data]
Number214 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.
Start2006-11-14 13:40
End2006-11-14 16:15
Added2006-11-15 08:19
AuthorDAH

[Data]
Number215 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.
Start2006-11-20 10:00
End2006-11-21 09:19
Added2006-11-21 09:22
AuthorDAH

[Data]
Number216 Instrument: MST Radar. The radar control and data acquisition PC was rebooted leading to a small gap in observations.
Start2006-11-23 16:20
End2006-11-23 16:30
Added2006-11-24 09:34
AuthorDAH

[Data]
Number217 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.
Start2006-11-25 10:00
End2006-11-27 08:26
Added2006-11-27 08:29
AuthorDAH

[Data]
Number270 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.
Start2006-11-26 03:10
End2006-11-26 03:20
Added2007-05-16 12:24
AuthorDAH

[Data]
Number218 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.
Start2006-11-28 01:00
End2006-11-28 01:30
Added2006-11-29 10:21
AuthorDAH

[Data]
Number219 Instrument: MST Radar. The radar control and data acquisition PC was rebooted leading to a small gap in observations.
Start2006-12-04 11:40
End2006-12-04 11:45
Added2006-12-05 08:18
AuthorDAH

[Data]
Number271 Atmospheric. ZAKO reported hearing thunder at around 09 UT.
Start2006-12-07 09:00
End2006-12-07 09:00
Added2007-05-16 12:26
AuthorDAH

[Data]
Number220 Instrument: MST Radar. The radar control and data acquisition PC was rebooted leading to a small gap in observations.
Start2006-12-13 09:25
End2006-12-13 09:35
Added2007-01-04 11:54
AuthorDAH

[Data]
Number221 Instrument: MST Radar. The radar control and data acquisition PC was rebooted leading to a small gap in observations.
Start2006-12-20 10:00
End2006-12-20 10:05
Added2007-01-04 11:56
AuthorDAH

[Data]
Number223 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.
Start2006-12-22 10:00
End2006-12-27 09:00
Added2007-01-04 12:06
AuthorDAH

[Data]
Number222 Instrument: MST Radar. The radar control and data acquisition PC was rebooted leading to a small gap in observations.
Start2006-12-29 09:50
End2006-12-29 09:55
Added2007-01-04 12:00
AuthorDAH

[Data]
Number272 Atmospheric. ZAKO reported hearing thunder at around 13 UT.
Start2006-12-31 13:00
End2006-12-31 13:00
Added2007-05-16 12:29
AuthorDAH

[Data]
Number273 Atmospheric. ZAKO reported hearing thunder at around 16 UT.
Start2007-01-01 16:00
End2007-01-01 16:00
Added2007-05-16 12:30
AuthorDAH

[Data]
Number224 Instrument: MST Radar. The radar control and data acquisition PC was rebooted leading to a small gap in observations.
Start2007-01-08 09:05
End2007-01-08 09:10
Added2007-01-09 09:35
AuthorDAH

[Data]
Number225 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.
Start2007-01-17 09:50
End2007-01-17 18:00
Added2007-01-25 09:00
AuthorDAH

[Data]
Number226 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.
Start2007-01-18 14:10
End2007-01-18 16:10
Added2007-01-25 09:02
AuthorDAH

[Data]
Number228 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).
Start2007-01-18 16:00
End2007-01-18 17:00
Added2007-01-25 09:25
AuthorDAH

[Data]
Number229 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).
Start2007-01-19 09:30
End2007-01-19 10:50
Added2007-01-25 09:26
AuthorDAH

[Data]
Number227 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.
Start2007-01-24 10:00
End2007-01-25 08:35
Added2007-01-25 09:06
AuthorDAH

[Data]
Number274 Instrument: MST Radar. There was a short gap it observations to allow ZAKO to reboot the radar control and data acquisition PC.
Start2007-01-25 11:00
End2007-01-25 11:15
Added2007-05-16 12:34
AuthorDAH

[Data]
Number275 Instrument: MST Radar. TX4 was briefly out of action to allow ZAKO to change the driver valve.
Start2007-01-30 11:00
End2007-01-30 12:00
Added2007-05-16 12:36
AuthorDAH

[Data]
Number237 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.
Start2007-02-01 00:00
End2007-02-28 23:59
Added2007-03-26 09:03
AuthorDAH

[Data]
Number235 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.
Start2007-02-01 16:00
End2007-03-23 12:00
Added2007-03-26 08:47
AuthorDAH

[Data]
Number231 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.
Start2007-02-02 10:00
End2007-02-02 10:15
Added2007-02-05 09:51
AuthorDAH

[Data]
Number232 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.
Start2007-02-03 10:00
End2007-02-05 09:40
Added2007-02-05 10:20
AuthorDAH

[Data]
Number233 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.
Start2007-02-06 13:23
End2007-02-06 13:44
Added2007-02-07 12:26
AuthorDAH

[Data]
Number234 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.
Start2007-02-06 13:44
End2007-02-14 13:01
Added2007-03-06 14:04
AuthorDAH

[Data]
Number311 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.
Start2007-02-06 13:44
End2008-02-07 12:48
Added2008-03-10 09:35
AuthorDAH

[Data]
Number236 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.
Start2007-03-21 10:00
End2007-03-21 12:48
Added2007-03-26 08:53
AuthorDAH

[Data]
Number238 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.
Start2007-04-02 07:32
End2007-04-02 07:33
Added2007-04-02 09:06
AuthorDAH

[Data]
Number239 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.
Start2007-04-02 07:32
End2007-04-03 07:42
Added2007-04-03 08:46
AuthorDAH

[Data]
Number240 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.
Start2007-04-05 05:30
End2007-04-10 11:00
Added2007-04-10 12:28
AuthorDAH

[Data]
Number241 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.
Start2007-04-10 10:00
End2007-04-11 08:16
Added2007-04-11 08:19
AuthorDAH

[Data]
Number246 Instrument: MST Radar. The radar experienced interference, although this did not contaminate the wind data.
Start2007-04-13 23:00
End2007-04-13 23:59
Added2007-04-25 10:10
AuthorDAH

[Data]
Number247 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.
Start2007-04-14 00:00
End2007-04-14 23:59
Added2007-04-25 10:13
AuthorDAH

[Data]
Number242 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.
Start2007-04-15 00:00
End2007-04-15 23:59
Added2007-04-19 08:12
AuthorDAH

[Data]
Number243 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.
Start2007-04-16 14:50
End2007-04-16 18:10
Added2007-04-19 08:15
AuthorDAH

[Data]
Number244 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.
Start2007-04-18 14:30
End2007-04-18 19:30
Added2007-04-19 08:17
AuthorDAH

[Data]
Number248 Instrument: MST Radar. The radar experienced interference although this had not impact on the wind profile data.
Start2007-04-19 15:40
End2007-04-19 19:00
Added2007-04-25 10:53
AuthorDAH

[Data]
Number245 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.
Start2007-04-23 21:00
End2007-04-23 23:59
Added2007-04-24 08:19
AuthorDAH

[Data]
Number304 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.
Start2007-04-23 21:00
End2007-12-12 10:40
Added2008-01-17 14:52
AuthorDAH

[Data]
Number250 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.
Start2007-05-09 00:00
End2007-05-09 13:00
Added2007-05-14 16:33
AuthorDAH

[Data]
Number249 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.
Start2007-05-14 09:00
End2007-05-14 10:00
Added2007-05-14 16:16
AuthorDAH

[Data]
Number251 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.
Start2007-05-15 16:20
End2007-05-15 23:10
Added2007-05-16 09:50
AuthorDAH

[Data]
Number277 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.
Start2007-05-16 14:05
End2007-05-16 15:02
Added2007-05-17 15:35
AuthorDAH

[Data]
Number278 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
Start2007-05-17 11:00
End2007-05-18 13:20
Added2007-05-21 09:59
AuthorDAH

[Data]
Number276 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.
Start2007-05-17 14:19
End2007-05-17 14:19
Added2007-05-17 15:29
AuthorDAH

[Data]
Number279 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.
Start2007-05-29 10:00
End2007-06-02 23:00
Added2007-05-31 08:17
AuthorDAH

[Data]
Number280 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.
Start2007-06-24 07:50
End2007-06-24 12:00
Added2007-06-25 09:14
AuthorDAH

[Data]
Number281 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.
Start2007-06-24 10:00
End2007-07-17 10:00
Added2007-07-06 09:05
AuthorDAH

[Data]
Number282 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.
Start2007-07-03 04:26
End2007-08-03 12:00
Added2007-07-11 14:17
AuthorDAH

[Data]
Number283 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.
Start2007-07-18 09:00
End2007-07-18 11:45
Added2007-07-19 08:42
AuthorDAH

[Data]
Number285 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.
Start2007-08-28 00:00
End2007-09-11 12:22
Added2007-09-11 13:07
AuthorDAH

[Data]
Number284 Instrument: Sky-Camera. There is an approximately 24 hour gap in observations resulting from the power lead to the camera accidentally being disconnected.
Start2007-09-10 11:08
End2007-09-11 11:06
Added2007-09-11 12:22
AuthorDAH

[Data]
Number287 Instrument: Ceilometer. DAH resynchronised the time of the ceilometer's internal clock, which had been running approximately 2 minutes and 10 s behind UT.
Start2007-09-12 14:55
End2007-09-12 14:55
Added2007-09-14 16:03
AuthorDAH

[Data]
Number286 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.
Start2007-09-12 16:15
End2007-09-12 16:19
Added2007-09-14 15:58
AuthorDAH

[Data]
Number288 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.
Start2007-09-18 02:00
End2007-10-03 09:53
Added2007-09-20 09:47
AuthorDAH

[Data]
Number289 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.
Start2007-10-03 09:46
End2007-10-03 09:53
Added2007-10-04 08:20
AuthorDAH

[Data]
Number290 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.
Start2007-10-08 15:13
End2007-10-08 19:33
Added2007-10-10 18:15
AuthorDAH

[Data]
Number291 Instrument: MST Radar. The radar was out of action to allow tests to be conducted for the Phase-II data acquisition system.
Start2007-10-09 09:20
End2007-10-09 14:32
Added2007-10-10 18:18
AuthorDAH

[Data]
Number292 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.
Start2007-10-10 14:33
End2007-10-10 14:58
Added2007-10-10 18:20
AuthorDAH

[Data]
Number293 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.
Start2007-10-17 00:00
End2007-10-17 23:00
Added2007-10-19 08:52
AuthorDAH

[Data]
Number294 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.
Start2007-10-18 10:30
End2007-10-18 21:00
Added2007-10-19 08:54
AuthorDAH

[Data]
Number295 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.
Start2007-10-19 10:00
End2007-10-19 22:00
Added2007-10-25 14:10
AuthorDAH

[Data]
Number296 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.
Start2007-10-20 11:00
End2007-10-20 12:10
Added2007-10-25 14:11
AuthorDAH

[Data]
Number297 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.
Start2007-10-21 04:45
End2007-10-21 05:15
Added2007-10-25 14:13
AuthorDAH

[Data]
Number298 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.
Start2007-10-22 00:00
End2007-10-22 09:00
Added2007-10-25 14:15
AuthorDAH

[Data]
Number299 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.
Start2007-10-23 20:30
End2007-10-23 21:15
Added2007-10-25 14:16
AuthorDAH

[Data]
Number300 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.
Start2007-10-24 11:30
End2007-10-24 12:30
Added2007-10-25 14:17
AuthorDAH

[Data]
Number301 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".
Start2007-10-29 12:56
End2007-10-31 09:26
Added2007-10-30 12:21
AuthorDAH

[Data]
Number302 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.
Start2007-10-31 21:45
End2007-11-01 10:25
Added2007-11-01 10:33
AuthorDAH

[Data]
Number305 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.
Start2007-11-27 13:50
End2007-11-27 15:50
Added2008-01-18 12:25
AuthorDAH

[Data]
Number303 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.
Start2007-11-29 00:00
End2007-11-29 12:15
Added2007-11-29 09:53
AuthorDAH

[Data]
Number306 Instrument: MST Radar. The radar was powered down to allow ZAKO to carry out an inspection of the antenna relays.
Start2008-01-30 11:10
End2008-01-30 16:15
Added2008-02-05 08:19
AuthorDAH

[Data]
Number307 Instrument: MST Radar. The radar was powered down to allow ZAKO to replace some of the antenna relays.
Start2008-02-04 11:45
End2008-02-04 16:15
Added2008-02-05 08:21
AuthorZKO

[Data]
Number308 Instrument: MST Radar. The radar was powered down to allow ZAKO to replace some of the antenna relays.
Start2008-02-05 09:10
End2008-02-05 15:00
Added2008-02-06 08:27
AuthorDAH

[Data]
Number309 Instrument: MST Radar. The radar was powered down to allow ZAKO to replace some of the antenna relays.
Start2008-02-06 09:30
End2008-02-06 12:15
Added2008-02-07 07:58
AuthorDAH

[Data]
Number312 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.
Start2008-02-07 11:00
End2008-02-07 12:50
Added2008-03-10 09:56
AuthorDAH

[Data]
Number310 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.
Start2008-02-10 05:56
End2008-02-11 09:45
Added2008-03-10 09:26
AuthorDAH

[Data]
Number313 Instrument: MST Radar. The radar operated unstably. This caused the signal processing to blank most of the wind-profile data.
Start2008-02-12 08:30
End2008-02-12 16:00
Added2008-03-10 10:02
AuthorDAH

[Data]
Number314 Instrument: MST Radar. The radar operated unstably causing the signal processing to blank most of the wind-profile data.
Start2008-02-14 00:00
End2008-02-14 04:00
Added2008-03-10 10:04
AuthorDAH

[Data]
Number315 Instrument: MST Radar. The radar operated unstably for a short period. The signal processing blanked the wind-profile data during this time.
Start2008-02-17 02:00
End2008-02-17 03:00
Added2008-03-10 10:06
AuthorDAH

[Data]
Number316 Instrument: MST Radar. The radar appears to have suffered a loss of transmitter power, which gave rise to reduced altitude coverage.
Start2008-02-19 15:30
End2008-02-19 16:50
Added2008-03-10 11:23
AuthorDAH

[Data]
Number317 Instrument: MST Radar. The radar appears to have suffered a loss of transmitter power, which gave rise to reduced altitude coverage.
Start2008-02-19 22:00
End2008-02-20 11:10
Added2008-03-10 11:24
AuthorDAH

[Data]
Number318 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.
Start2008-02-29 09:50
End2008-02-29 22:00
Added2008-03-10 11:47
AuthorDAH

[Data]
Number319 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.
Start2008-03-05 08:10
End2008-03-08 13:10
Added2008-03-10 12:26
AuthorDAH

[Data]
Number320 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.
Start2008-03-31 11:00
End2008-03-31 17:24
Added2008-04-01 11:49
AuthorDAH

[Data]
Number321 Instrument: MST Radar. The radar suffered a short period of interference. This does not appear to have contaminated the wind-profile data.
Start2008-04-04 00:50
End2008-04-04 02:30
Added2008-04-07 14:02
AuthorDAH

[Data]
Number322 Instrument: MST Radar. The radar suffered a short period of interference. This does not appear to have contaminated the wind-profile data.
Start2008-04-04 15:30
End2008-04-04 19:00
Added2008-04-07 14:03
AuthorDAH

[Data]
Number323 Instrument: MST Radar. The radar suffered a short period of interference. This does not appear to have contaminated the wind-profile data.
Start2008-04-05 13:30
End2008-04-05 19:10
Added2008-04-07 14:04
AuthorDAH

[Data]
Number324 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.
Start2008-04-14 20:30
End2008-04-15 08:18
Added2008-04-15 10:32
AuthorDAH

[Data]
Number326 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.
Start2008-04-23 06:00
End2008-04-23 10:40
Added2008-04-28 13:42
AuthorDAH

[Data]
Number325 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.
Start2008-04-23 11:45
End2008-04-23 12:15
Added2008-04-28 08:42
AuthorDAH

[Data]
Number327 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.
Start2008-04-24 03:30
End2008-04-24 19:00
Added2008-04-28 13:48
AuthorZKO

[Data]
Number328 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.
Start2008-04-25 03:20
End2008-04-25 08:00
Added2008-04-28 13:51
AuthorDAH

[Data]
Number329 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.
Start2008-04-25 18:30
End2008-04-25 23:59
Added2008-04-28 13:52
AuthorZKO

[Data]
Number330 Instrument: MST Radar. The radar suffered from interference, although this did not cause any contamination of the wind-profile data.
Start2008-04-26 00:00
End2008-04-26 01:00
Added2008-04-28 13:58
AuthorDAH

[Data]
Number331 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.
Start2008-04-27 11:30
End2008-04-27 13:30
Added2008-04-28 14:00
AuthorDAH

[Data]
Number332 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.
Start2008-04-27 19:30
End2008-04-27 20:30
Added2008-04-28 14:01
AuthorDAH

[Data]
Number333 Instrument: MST Radar. The radar suffered a period of interference, although this appears to have been successfully blanked by the signal processing.
Start2008-04-28 13:50
End2008-04-28 19:00
Added2008-05-07 08:10
AuthorDAH

[Data]
Number334 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.
Start2008-04-29 10:50
End2008-04-29 18:00
Added2008-05-07 08:12
AuthorDAH

[Data]
Number335 Instrument: MST radar. The radar suffered from a short period of interference. However, the signal processing prevented the wind-profile data from being contaminated.
Start2008-05-01 10:30
End2008-05-01 11:10
Added2008-05-07 08:14
AuthorDAH

[Data]
Number336 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.
Start2008-05-02 00:00
End2008-05-02 08:20
Added2008-05-07 08:19
AuthorDAH

[Data]
Number337 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.
Start2008-05-05 00:00
End2008-05-05 09:40
Added2008-05-07 08:22
AuthorDAH

[Data]
Number338 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.
Start2008-06-10 08:42
End2008-06-10 10:55
Added2008-06-10 12:27
AuthorDAH

[Data]
Number339 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.
Start2008-07-04 11:00
End2008-07-04 14:00
Added2008-07-04 16:09
AuthorDAH

[Data]
Number340 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.
Start2008-07-11 16:00
End2008-07-18 15:20
Added2008-07-24 11:50
AuthorDAH

[Data]
Number344 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.
Start2008-07-20 21:00
End2008-07-30 10:00
Added2008-08-04 08:28
AuthorDAH

[Data]
Number341 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.
Start2008-07-23 17:08
End2008-07-23 18:13
Added2008-07-24 14:20
AuthorDAH

[Data]
Number342 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.
Start2008-07-23 17:31
End2008-07-24 11:18
Added2008-07-24 14:28
AuthorDAH

[Data]
Number343 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.
Start2008-07-29 15:19
End2008-07-29 18:49
Added2008-07-30 08:17
AuthorDAH

[Data]
Number345 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.
Start2008-08-06 00:00
End2008-08-07 10:58
Added2008-08-07 11:02
AuthorDAH

[Data]
Number346 Instrument: Laser ceilometer. DAH reset the internal clock at 09:05 UT. It had been running approximately 45 s slow.
Start2008-08-07 09:05
End2008-08-07 09:05
Added2008-08-07 11:40
AuthorDAH

[Data]
Number347 Instrument: MST Radar. The radar appears to have suffered from interference, although this did not contaminate the wind profiles.
Start2008-08-07 14:00
End2008-08-07 15:30
Added2008-08-11 09:00
AuthorDAH

[Data]
Number348 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.
Start2008-08-08 10:30
End2008-08-08 11:30
Added2008-08-11 09:03
AuthorDAH

[Data]
Number349 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.
Start2008-08-14 10:00
End2008-08-14 11:00
Added2008-08-26 15:29
AuthorDAH

[Data]
Number350 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.
Start2008-08-18 10:00
End2008-08-18 10:30
Added2008-08-26 15:33
AuthorDAH

[Data]
Number351 Instrument: MST Radar. The radar was powered down to allow ZAKO to carry out some work within the antenna array.
Start2008-09-03 08:18
End2008-09-03 10:13
Added2008-09-04 08:07
AuthorDAH

[Data]
Number352 Instrument: MST Radar. The radar was powered down to allow ZAKO to carry out some work within the antenna array.
Start2008-09-08 08:20
End2008-09-08 10:15
Added2008-09-09 08:09
AuthorDAH

[Data]
Number353 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.
Start2008-09-10 09:00
End2008-09-10 09:40
Added2008-09-11 08:06
AuthorDAH

[Data]
Number354 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.
Start2008-09-25 10:00
End2008-10-09 11:15
Added2008-10-10 08:26
AuthorDAH

[Data]
Number355 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.
Start2008-10-28 11:15
End2008-10-28 11:25
Added2008-10-29 10:03
AuthorDAH

[Data]
Number356 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.
Start2008-10-29 13:55
End2008-10-29 15:20
Added2008-10-30 08:02
AuthorDAH

[Data]
Number357 Instrument: MST Radar. The radar was powered down in order to permit a scheduled inspection of the antenna array.
Start2008-10-30 13:50
End2008-10-30 16:18
Added2008-10-30 16:37
AuthorDAH

[Data]
Number358 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.
Start2008-11-07 03:30
End2008-11-07 15:10
Added2008-11-07 14:25
AuthorDAH

[Data]
Number359 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).
Start2008-11-07 08:36
End2008-11-10 17:30
Added2008-11-11 09:56
AuthorDAH

[Data]
Number360 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.
Start2008-11-13 16:00
End2008-11-17 12:00
Added2008-11-18 08:17
AuthorZKO

[Data]
Number361 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.
Start2008-11-20 13:15
End2008-11-20 13:39
Added2008-11-21 08:24
AuthorDAH

[Data]
Number362 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.
Start2008-11-23 06:00
End2008-11-24 10:00
Added2008-11-26 08:24
AuthorDAH

[Data]
Number363 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.
Start2008-11-25 10:00
End2008-11-25 15:30
Added2008-11-26 10:19
AuthorDAH

[Data]
Number364 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.
Start2008-11-28 00:30
End2008-11-28 00:30
Added2008-12-01 10:34
AuthorDAH

[Data]
Number365 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.
Start2008-11-29 03:00
End2008-11-29 23:59
Added2008-12-01 11:24
AuthorDAH

[Data]
Number366 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.
Start2008-11-30 03:00
End2008-11-30 23:59
Added2008-12-01 11:29
AuthorDAH

[Data]
Number367 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.
Start2008-12-01 00:00
End2008-12-01 12:30
Added2008-12-02 08:15
AuthorDAH

[Data]
Number368 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.
Start2008-12-02 13:30
End2008-12-02 15:29
Added2008-12-02 16:17
AuthorDAH

[Data]
Number369 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.
Start2008-12-04 10:00
End2008-12-04 23:59
Added2008-12-05 09:33
AuthorDAH

[Data]
Number370 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.
Start2008-12-05 00:00
End2008-12-05 02:40
Added2008-12-08 08:35
AuthorDAH

[Data]
Number371 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.
Start2008-12-05 09:20
End2008-12-05 11:00
Added2008-12-08 08:35
AuthorDAH

[Data]
Number372 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.
Start2008-12-07 02:00
End2008-12-07 12:00
Added2008-12-08 08:39
AuthorDAH

[Data]
Number373 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.
Start2008-12-08 07:50
End2008-12-08 09:20
Added2008-12-09 09:39
AuthorDAH

[Data]
Number374 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.
Start2008-12-08 18:50
End2008-12-08 20:40
Added2008-12-09 09:39
AuthorDAH

[Data]
Number375 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.
Start2008-12-09 11:20
End2008-12-09 12:10
Added2008-12-10 08:25
AuthorDAH

[Data]
Number376 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.
Start2008-12-10 10:10
End2008-12-10 13:47
Added2008-12-11 08:10
AuthorDAH

[Data]
Number377 Instrument: MST radar. The radar suffered a short period of interference. This does not appear to have contaminated the wind-profile data.
Start2008-12-10 14:30
End2008-12-10 15:10
Added2008-12-11 08:11
AuthorDAH

[Data]
Number379 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.
Start2008-12-10 20:10
End2008-12-11 12:10
Added2008-12-12 10:13
AuthorDAH

[Data]
Number378 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.
Start2008-12-11 01:30
End2008-12-11 11:30
Added2008-12-12 10:07
AuthorDAH

[Data]
Number380 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.
Start2008-12-12 11:15
End2008-12-12 13:00
Added2008-12-18 08:19
AuthorDAH

[Data]
Number381 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.
Start2008-12-13 19:55
End2008-12-13 21:15
Added2008-12-18 08:20
AuthorDAH

[Data]
Number382 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.
Start2008-12-15 01:40
End2008-12-15 09:00
Added2008-12-18 08:23
AuthorDAH

[Data]
Number383 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.
Start2008-12-16 05:50
End2008-12-16 07:20
Added2008-12-18 08:25
AuthorDAH

[Data]
Number384 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.
Start2008-12-17 06:15
End2008-12-17 07:00
Added2008-12-18 08:25
AuthorDAH

[Data]
Number385 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.
Start2008-12-17 11:00
End2008-12-17 13:30
Added2008-12-18 08:26
AuthorDAH

[Data]
Number386 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.
Start2008-12-19 07:20
End2008-12-19 10:20
Added2008-12-22 08:20
AuthorDAH

[Data]
Number388 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.
Start2008-12-26 00:00
End2008-12-26 04:30
Added2009-01-06 09:00
AuthorDAH

[Data]
Number389 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.
Start2008-12-26 18:50
End2008-12-27 11:00
Added2009-01-06 09:04
AuthorDAH

[Data]
Number390
Start2008-12-29 00:00
End2009-01-01 14:46
Added2009-01-06 14:47
AuthorDAH

[Data]
Number391 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.
Start2008-12-29 00:00
End2009-01-01 08:40
Added2009-01-06 14:50
AuthorDAH

[Data]
Number387 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.
Start2008-12-30 19:40
End2008-12-31 12:40
Added2008-12-31 12:54
AuthorDAH

[Data]
Number392 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.
Start2009-01-01 09:30
End2009-01-01 10:00
Added2009-01-06 14:51
AuthorDAH

[Data]
Number393 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.
Start2009-01-01 19:00
End2009-01-04 14:30
Added2009-01-06 15:09
AuthorDAH

[Data]
Number394 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.
Start2009-01-04 21:00
End2009-01-06 12:00
Added2009-01-07 08:24
AuthorDAH

[Data]
Number395 Instrument: MST Radar. The radar suffered from a period of interference, although this does not appear to have contaminated the wind-profile data.
Start2009-01-07 02:00
End2009-01-07 04:20
Added2009-01-08 08:14
AuthorDAH

[Data]
Number396 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.
Start2009-01-15 11:45
End2009-01-15 11:45
Added2009-01-16 14:29
AuthorDAH

[Data]
Number398 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.
Start2009-01-16 09:30
End2009-01-16 09:30
Added2009-01-19 08:14
AuthorDAH

[Data]
Number397 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.
Start2009-01-16 10:19
End2009-01-16 10:19
Added2009-01-16 14:33
AuthorDAH

[Data]
Number399 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.
Start2009-01-18 02:00
End2009-01-18 03:40
Added2009-01-19 08:16
AuthorDAH

[Data]
Number400 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.
Start2009-01-18 18:15
End2009-01-18 21:10
Added2009-01-19 08:16
AuthorDAH

[Data]
Number401 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.
Start2009-01-19 03:00
End2009-01-19 18:20
Added2009-01-20 08:08
AuthorDAH

[Data]
Number402 Instrument: MST Radar. The radar suffered from a short period of interference. This does not appear to have contaminated the wind-profile data.
Start2009-01-20 02:00
End2009-01-20 02:40
Added2009-01-21 08:20
AuthorDAH

[Data]
Number403 Instrument: MST Radar. The radar suffered from a short period of interference. This does not appear to have contaminated the wind-profile data.
Start2009-01-20 18:00
End2009-01-20 19:20
Added2009-01-21 08:21
AuthorDAH

[Data]
Number404 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.
Start2009-01-21 17:45
End2009-01-21 18:15
Added2009-01-22 08:44
AuthorDAH

[Data]
Number405 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.
Start2009-01-23 00:00
End2009-01-23 03:40
Added2009-01-26 08:09
AuthorDAH

[Data]
Number406 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.
Start2009-01-23 07:00
End2009-01-23 12:00
Added2009-01-26 08:10
AuthorZKO

[Data]
Number407 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.
Start2009-01-23 20:40
End2009-01-23 21:10
Added2009-01-26 08:11
AuthorZKO

[Data]
Number408 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.
Start2009-01-24 13:30
End2009-01-24 14:30
Added2009-01-26 08:13
AuthorDAH

[Data]
Number409 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.
Start2009-01-24 21:00
End2009-01-24 23:00
Added2009-01-26 08:13
AuthorDAH

[Data]
Number410 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.
Start2009-01-25 00:00
End2009-01-25 01:00
Added2009-01-26 08:14
AuthorDAH

[Data]
Number411 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.
Start2009-01-25 09:00
End2009-01-25 10:30
Added2009-01-26 08:15
AuthorDAH

[Data]
Number412 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.
Start2009-01-26 07:40
End2009-01-26 08:50
Added2009-01-27 08:21
AuthorDAH

[Data]
Number413 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.
Start2009-01-26 19:00
End2009-01-26 19:40
Added2009-01-27 08:22
AuthorDAH

[Data]
Number414 Instrument: MST Radar. The radar suffered from a period of interference. This does not appear to have contaminated the wind-profile data.
Start2009-01-27 06:00
End2009-01-27 08:30
Added2009-01-28 08:07
AuthorDAH

[Data]
Number415 Instrument: MST Radar. The radar sufered from a very short period of interference. This does not appear to have contaminated the wind-profile data.
Start2009-01-28 20:30
End2009-01-28 20:45
Added2009-01-30 08:07
AuthorDAH

[Data]
Number416 Instrument: MST Radar. The radar suffered from a short period of interference although this does not appear to have contaminated the wind-profile data.
Start2009-01-29 05:00
End2009-01-29 06:20
Added2009-01-30 08:09
AuthorDAH

[Data]
Number417 Instrument: MST Radar. The radar suffered from a period of interference. This caused contamination of the wind-profile data 04:30 - 05:10 UT.
Start2009-01-31 03:20
End2009-01-31 06:00
Added2009-02-02 08:13
AuthorDAH

[Data]
Number418 Instrument: MST Radar. The radar suffered from a period of interference. This did not cause any contamination of the wind-profile data.
Start2009-01-31 10:30
End2009-01-31 11:20
Added2009-02-02 08:14
AuthorDAH

[Data]
Number419 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.
Start2009-01-31 19:30
End2009-01-31 20:50
Added2009-02-02 08:16
AuthorDAH

[Data]
Number420 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.
Start2009-01-31 21:00
End2009-02-01 00:30
Added2009-02-02 08:21
AuthorDAH

[Data]
Number421 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.
Start2009-02-01 03:00
End2009-02-01 11:00
Added2009-02-02 08:27
AuthorDAH

[Data]
Number422 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.
Start2009-02-01 21:00
End2009-02-02 09:30
Added2009-02-02 11:25
AuthorDAH

[Data]
Number423 Instrument: MST Radar. The radar was powered down so that some maintenance work could be undertaken.
Start2009-02-04 09:50
End2009-02-04 13:14
Added2009-02-04 16:04
AuthorDAH

[Data]
Number424 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.
Start2009-02-20 19:30
End2009-02-21 06:20
Added2009-03-02 10:30
AuthorDAH

[Data]
Number425 Instrument: MST Radar. The radar suffered from a short period of intereference which did not cause any contamination of the wind-profile data.
Start2009-02-21 12:30
End2009-02-21 12:50
Added2009-03-02 10:33
AuthorDAH

[Data]
Number426 Instrument: MST Radar. The radar suffered from a short period of intereference which did not cause any contamination of the wind-profile data.
Start2009-02-21 18:00
End2009-02-21 20:00
Added2009-03-02 10:33
AuthorDAH

[Data]
Number427 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.
Start2009-02-22 20:00
End2009-02-23 02:00
Added2009-03-02 10:37
AuthorDAH

[Data]
Number428 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.
Start2009-02-24 00:30
End2009-02-24 04:30
Added2009-03-02 10:41
AuthorDAH

[Data]
Number429 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.
Start2009-02-24 23:30
End2009-02-25 01:00
Added2009-03-02 10:46
AuthorDAH

[Data]
Number430 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.
Start2009-02-26 12:00
End2009-02-26 17:00
Added2009-03-02 10:49
AuthorDAH

[Data]
Number431 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.
Start2009-02-28 08:30
End2009-02-28 09:50
Added2009-03-02 11:02
AuthorDAH

[Data]
Number432 Instrument: MST Radar. The radar suffered from a short period of interference. This did not cause any contamination of the wind-profile data.
Start2009-02-28 20:30
End2009-02-28 22:00
Added2009-03-02 11:06
AuthorDAH

[Data]
Number433 Instrument: MST Radar. The radar suffered from a period of mild interference. This did not cause any contamination of the wind-profile data.
Start2009-03-01 13:00
End2009-03-01 14:00
Added2009-03-02 11:54
AuthorDAH

[Data]
Number434 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.
Start2009-03-06 19:00
End2009-03-07 01:00
Added2009-03-12 08:24
AuthorDAH

[Data]
Number435 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.
Start2009-03-08 01:30
End2009-03-08 02:15
Added2009-03-12 08:27
AuthorDAH

[Data]
Number436 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.
Start2009-03-10 00:00
End2009-03-10 01:00
Added2009-03-12 09:43
AuthorDAH

[Data]
Number437 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.
Start2009-03-10 05:00
End2009-03-10 08:30
Added2009-03-12 09:45
AuthorDAH

[Data]
Number438 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.
Start2009-03-10 11:40
End2009-03-10 13:20
Added2009-03-12 09:48
AuthorDAH

[Data]
Number439 Instrument: MST Radar. The radar suffered from a short period of interference, This does not appear to have contaminated the wind-profile data.
Start2009-03-14 03:30
End2009-03-14 04:40
Added2009-03-17 08:27
AuthorDAH

[Data]
Number440 Instrument: MST Radar. The radar suffered from a short period of interference, This does not appear to have contaminated the wind-profile data.
Start2009-03-14 11:30
End2009-03-14 12:30
Added2009-03-17 08:34
AuthorDAH

[Data]
Number441 Instrument: MST Radar. The radar suffered from a short period of interference, This does not appear to have contaminated the wind-profile data.
Start2009-03-14 23:00
End2009-03-14 23:59
Added2009-03-17 08:35
AuthorDAH

[Data]
Number442 Instrument: MST Radar. The radar suffered from a short period of interference, This does not appear to have contaminated the wind-profile data.
Start2009-03-15 10:30
End2009-03-15 11:00
Added2009-03-17 08:44
AuthorDAH

[Data]
Number443 Instrument: MST Radar. The radar suffered from a short period of interference, This does not appear to have contaminated the wind-profile data.
Start2009-03-15 23:00
End2009-03-15 23:30
Added2009-03-17 08:44
AuthorDAH

[Data]
Number444 Instrument: MST Radar. The radar suffered from a short period of interference. This does not appear to have contaminated the wind-profile data.
Start2009-03-21 22:00
End2009-03-21 22:40
Added2009-03-27 09:28
AuthorDAH

[Data]
Number452 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.
Start2009-03-23 09:55
End2009-05-05 07:30
Added2009-05-05 13:33
AuthorDAH

[Data]
Number445 Instrument: MST Radar. The radar suffered from two short instances of interference during this period. Neither appears to have contaminated the wind-profile data.
Start2009-03-24 02:00
End2009-03-24 05:00
Added2009-03-27 12:27
AuthorDAH

[Data]
Number446 Instrument: MST Radar. The radar suffered from a short period of interference. This does not appear to have contaminated the wind-profile data.
Start2009-03-28 06:45
End2009-03-28 08:00
Added2009-03-30 08:17
AuthorDAH

[Data]
Number447 Instrument: MST Radar. The radar suffered from a short period of interference. This does not appear to have contaminated the wind-profile data.
Start2009-03-28 21:00
End2009-03-28 22:00
Added2009-03-30 08:17
AuthorDAH

[Data]
Number448 Instrument: MST Radar. The radar suffered from a short period of interference. This did not contaminate the wind-profile data.
Start2009-04-02 03:00
End2009-04-02 03:50
Added2009-04-03 08:05
AuthorDAH

[Data]
Number449 Instrument: MST Radar. The radar suffered from a short period of interference. This did not contaminate the wind-profile data.
Start2009-04-03 03:50
End2009-04-03 04:45
Added2009-04-06 08:13
AuthorDAH

[Data]
Number450 Instrument: MST Radar. The radar suffered from a short period of interference. This did not contaminate the wind-profile data.
Start2009-04-05 02:30
End2009-04-05 03:20
Added2009-04-06 08:17
AuthorDAH

[Data]
Number451 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.
Start2009-04-27 13:00
End2009-04-27 16:45
Added2009-04-28 09:06
AuthorDAH

[Data]
Number453 Instrument: MST Radar. The radar was powered down to allow LED to install a new blower motor on TX1.
Start2009-05-07 14:10
End2009-05-07 15:47
Added2009-05-08 08:11
AuthorDAH

[Data]
Number454 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.
Start2009-05-12 00:00
End2009-06-08 07:30
Added2009-06-02 09:12
AuthorDAH

[Data]
Number463 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.
Start2009-05-22 12:00
End2009-05-22 12:00
Added2009-06-23 16:27
AuthorDAH

[Data]
Number464 Instrument: MST Radar. LED replaced the EHT fuse on TX3.
Start2009-05-26 12:00
End2009-05-26 12:00
Added2009-06-23 16:29
AuthorDAH

[Data]
Number455 Instrument: Campbell Scientific surface met sensors. DAH updated the clock on the data logger which had been running 11 s slow.
Start2009-06-08 07:18
End2009-06-08 07:18
Added2009-06-08 10:13
AuthorDAH

[Data]
Number456 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.
Start2009-06-08 15:00
End2009-06-08 18:30
Added2009-06-09 08:06
AuthorDAH

[Data]
Number457 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.
Start2009-06-09 12:30
End2009-06-09 13:30
Added2009-06-10 12:08
AuthorDAH

[Data]
Number458 Instrument: MST Radar. The radar suffered from a short period of interference. This caused only a very minor contamination of the wind-profile data.
Start2009-06-11 17:30
End2009-06-11 18:00
Added2009-06-12 08:10
AuthorDAH

[Data]
Number459 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.
Start2009-06-12 08:50
End2009-06-12 12:00
Added2009-06-22 08:16
AuthorDAH

[Data]
Number460 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.
Start2009-06-12 18:00
End2009-06-12 20:30
Added2009-06-22 08:20
AuthorDAH

[Data]
Number461 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.
Start2009-06-19 09:50
End2009-06-20 09:00
Added2009-06-22 08:28
AuthorDAH

[Data]
Number462 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.
Start2009-06-21 08:28
End2009-06-21 11:10
Added2009-06-22 08:33
AuthorDAH

[Data]
Number465 Instrument: MST Radar. TX6 was powered down to allow LED to fix a new blower motor to it.
Start2009-06-26 10:20
End2009-06-26 12:50
Added2009-06-26 16:16
AuthorDAH

[Data]
Number467 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.
Start2009-07-14 12:00
End2009-07-21 12:00
Added2009-07-22 08:22
AuthorDAH

[Data]
Number466 Instrument: MST Radar. The radar appears to have suffered from interference, although this does not appear to have contaminated any of the data products.
Start2009-07-17 09:00
End2009-07-17 11:00
Added2009-07-20 08:10
AuthorDAH

[Data]
Number468 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.
Start2009-07-24 08:30
End2009-07-24 11:32
Added2009-07-24 13:59
AuthorDAH

[Data]
Number469 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.
Start2009-07-24 09:22
End2009-07-24 11:13
Added2009-07-24 14:03
AuthorDAH

[Data]
Number470 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.
Start2009-07-28 14:00
End2009-07-28 14:45
Added2009-07-29 08:13
AuthorDAH

[Data]
Number473 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.
Start2009-08-28 12:00
End2009-09-02 09:01
Added2009-09-07 09:24
AuthorDAH

[Data]
Number471 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.
Start2009-08-30 08:00
End2009-08-30 09:00
Added2009-09-02 08:48
AuthorDAH

[Data]
Number474 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.
Start2009-09-01 10:00
End2009-09-05 19:34
Added2009-09-09 08:45
AuthorDAH

[Data]
Number472 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.
Start2009-09-01 14:00
End2009-09-01 15:00
Added2009-09-07 09:17
AuthorDAH

[Data]
Number475 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.
Start2009-09-14 13:50
End2009-11-09 14:48
Added2009-09-21 14:51
AuthorDAH

[Data]
Number477 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.
Start2009-10-02 08:30
End2009-10-02 10:30
Added2009-10-02 14:24
AuthorDAH

[Data]
Number479 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.
Start2009-10-09 09:00
End2009-10-09 11:15
Added2009-10-23 08:38
AuthorDAH

[Data]
Number478 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.
Start2009-10-10 16:00
End2009-10-12 08:23
Added2009-10-12 08:25
AuthorDAH

[Data]
Number480 Instrument: MST Radar. The radar was powered down to allow a survey to be carried out on the antenna array.
Start2009-11-03 13:25
End2009-11-03 16:06
Added2009-11-03 16:29
AuthorDAH

[Data]
Number483 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.
Start2009-11-06 00:00
End2009-11-10 12:00
Added2009-11-18 10:35
AuthorDAH

[Data]
Number481 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.
Start2009-11-13 09:00
End2009-11-13 12:30
Added2009-11-13 13:55
AuthorDAH

[Data]
Number482 Instrument: MST Radar. The radar was powered down to allow a scheduled inspection to be carried out within the antenna array.
Start2009-11-17 09:58
End2009-11-17 12:47
Added2009-11-18 10:06
AuthorDAH

[Data]
Number484 Instrument: MST Radar. The radar suffered from a prologed period of interference. This does not appear to have contaminated the wind-profile data.
Start2009-11-22 16:00
End2009-11-23 04:00
Added2009-11-23 08:02
AuthorDAH

[Data]
Number485 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.
Start2009-11-26 02:30
End2009-11-26 13:00
Added2009-11-27 09:31
AuthorDAH

[Data]
Number486 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.
Start2009-12-03 20:00
End2009-12-03 22:00
Added2009-12-04 08:27
AuthorDAH

[Data]
Number487 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.
Start2009-12-13 03:00
End2009-12-13 12:00
Added2009-12-14 17:10
AuthorDAH

[Data]
Number488 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.
Start2009-12-14 04:00
End2009-12-14 10:30
Added2009-12-14 17:12
AuthorDAH

[Data]
Number490 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.
Start2009-12-15 12:40
End2009-12-17 10:40
Added2009-12-18 08:18
AuthorDAH

[Data]
Number489 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.
Start2009-12-16 07:30
End2009-12-17 10:30
Added2009-12-17 09:16
AuthorDAH

[Data]
Number491 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.
Start2009-12-18 11:40
End2009-12-21 16:00
Added2009-12-22 08:49
AuthorDAH

[Data]
Number492 Instrument: MST Radar. The radar appears to have experienced interference sporadically during this period, although no contamination of the wind-profile data is evident.
Start2009-12-21 18:30
End2009-12-22 11:00
Added2009-12-23 08:33
AuthorDAH

[Data]
Number494 Instrument: MST Radar. The radar suffered from a short period of interference, which did not cause any contamination of the wind-profile data.
Start2009-12-23 11:30
End2009-12-23 12:00
Added2010-01-04 10:04
AuthorDAH

[Data]
Number495 Instrument: MST Radar. The radar suffered from intermittent interference, which did not contaminate the wind-profile data.
Start2009-12-25 00:00
End2009-12-25 12:30
Added2010-01-04 10:10
AuthorDAH

[Data]
Number496 Instrument: MST Radar. The radar suffered from a period of interference, which did not contaminate the wind-profile data.
Start2009-12-27 07:00
End2009-12-27 14:00
Added2010-01-04 10:14
AuthorDAH

[Data]
Number497 Instrument: MST Radar. The radar suffered from a period of interference, which did not contaminate the wind-profile data.
Start2009-12-27 21:30
End2009-12-28 03:00
Added2010-01-04 10:18
AuthorDAH

[Data]
Number498 Instrument: MST Radar. The radar suffered from intermittent interference, which did not contaminate the wind-profile data.
Start2009-12-28 11:30
End2009-12-29 03:00
Added2010-01-04 10:20
AuthorDAH

[Data]
Number499 Instrument: MST Radar. The radar suffered from a prolonged period of interference, which did not contaminate the wind-profile data.
Start2009-12-29 20:30
End2009-12-31 00:30
Added2010-01-04 10:23
AuthorDAH

[Data]
Number500 Instrument: MST Radar. The radar suffered from a period of interference, which did not contaminate the wind-profile data.
Start2009-12-31 03:50
End2009-12-31 06:00
Added2010-01-04 10:24
AuthorDAH

[Data]
Number502 Instrument: Campbell Scientific Surface Wind Sensors (Frongoch). There is an (as-yet) inexplicable gap in the data recorded by the logger.
Start2010-01-01 22:22
End2010-01-02 07:00
Added2010-01-04 11:46
AuthorDAH

[Data]
Number501 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.
Start2010-01-03 06:00
End2010-01-03 17:10
Added2010-01-04 10:36
AuthorDAH

[Data]
Number493 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).
Start2010-01-03 20:48
End2010-01-04 21:42
Added2010-01-04 09:56
AuthorDAH

[Data]
Number503 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.
Start2010-01-04 18:40
End2010-01-05 01:40
Added2010-01-05 08:10
AuthorDAH

[Data]
Number504 Instrument: MST Radar. The radar suffered from intermittent interference, which does not appear to have contaminated the wind-profile data.
Start2010-01-06 19:10
End2010-01-07 01:30
Added2010-01-08 08:27
AuthorDAH

[Data]
Number505 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.
Start2010-01-08 00:29
End2010-01-08 16:00
Added2010-01-08 08:34
AuthorDAH

[Data]
Number506 Instrument: MST Radar. The radar suffered from a short period of interference which did not contaminate the wind-profile data.
Start2010-01-08 11:40
End2010-01-08 13:20
Added2010-01-11 10:14
AuthorDAH

[Data]
Number507 Instrument: MST Radar. The radar suffered from a short period of interference which did not contaminate the wind-profile data.
Start2010-01-08 17:45
End2010-01-08 19:00
Added2010-01-11 10:15
AuthorDAH

[Data]
Number508 Instrument: MST Radar. The radar suffered from a short period of interference which did not contaminate the wind-profile data.
Start2010-01-08 21:50
End2010-01-08 23:00
Added2010-01-11 10:16
AuthorDAH

[Data]
Number509 Instrument: MST Radar. The radar suffered from a few short periods of interference during this interval. None caused contamination of the wind-profile data.
Start2010-01-09 00:00
End2010-01-09 19:00
Added2010-01-11 10:19
AuthorDAH

[Data]
Number510 Instrument: MST Radar. The radar suffered from a few short periods of interference during this interval. None caused contamination of the wind-profile data.
Start2010-01-10 00:00
End2010-01-10 19:00
Added2010-01-11 10:21
AuthorDAH

[Data]
Number511 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.
Start2010-01-12 10:30
End2010-01-12 12:30
Added2010-01-14 08:40
AuthorDAH

[Data]
Number512 Instrument: MST Radar. LD removed TX6 from service in order to investigate its output power level.
Start2010-01-15 10:00
End2010-01-15 11:00
Added2010-01-18 08:21
AuthorDAH

[Data]
Number513 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].
Start2010-01-27 13:30
End2010-01-27 16:30
Added2010-01-28 10:06
AuthorDAH

[Data]
Number514 Instrument: MST Radar. The radar suffered from a brief period of interference. This did not cause any contamination of the wind-profile data.
Start2010-02-01 12:30
End2010-02-01 15:00
Added2010-02-02 08:13
AuthorDAH

[Data]
Number515 Instrument: MST Radar. LD powered down TX5 so that he could install an attachment mechanism for a new type of extractor fan.
Start2010-02-02 10:00
End2010-02-02 12:00
Added2010-02-02 16:20
AuthorDAH

[Data]
Number516 Instrument: MST Radar. The radar suffered from a few brief instances of interference during this period. This did not contaminate the wind profile data.
Start2010-02-02 17:00
End2010-02-02 20:00
Added2010-02-03 08:08
AuthorDAH

[Data]
Number517 Instrument: MST Radar. LD powered down TX6 so that he could change the extractor fan.
Start2010-02-09 10:00
End2010-02-09 12:30
Added2010-02-10 08:05
AuthorDAH

[Data]
Number518 Instrument: MST Radar. The radar suffered from intermittent interference. This did not cause any contamination of the wind-profile data.
Start2010-02-10 05:50
End2010-02-10 09:10
Added2010-02-11 08:08
AuthorDAH

[Data]
Number519 Instrument: MST Radar. The radar suffered from a period of interference. This did not cause any contamination of the wind-profile data.
Start2010-02-11 03:50
End2010-02-11 09:30
Added2010-02-12 08:05
AuthorDAH

[Data]
Number520 Instrument: MST Radar. LD powered down TX5 to allow him to undertake some work on it.
Start2010-02-12 10:30
End2010-02-12 12:15
Added2010-02-12 16:28
AuthorDAH

[Data]
Number523 Instrument: MST Radar. The radar suffered from a very brief period of interference. This did not contaminate the wind-profile data.
Start2010-02-14 09:00
End2010-02-14 09:10
Added2010-03-15 10:29
AuthorDAH

[Data]
Number524 Instrument: MST Radar. The radar suffered from a period of interference. The wind-profile data were not contaminated.
Start2010-02-26 14:30
End2010-02-26 17:30
Added2010-03-15 11:18
AuthorDAH

[Data]
Number525 Instrument: MST Radar. The radar suffered from intermittent interference. This did not cause any contamination of the wind profile data.
Start2010-03-02 03:00
End2010-03-02 10:00
Added2010-03-15 11:33
AuthorDAH

[Data]
Number521 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.
Start2010-03-02 09:17
End2010-03-05 12:09
Added2010-03-03 17:02
AuthorDAH

[Data]
Number526 Instrument: MST Radar. The radar suffered from intermittent interference. This did not cause any contamination of the wind-profile data.
Start2010-03-05 03:30
End2010-03-05 09:30
Added2010-03-15 11:36
AuthorDAH

[Data]
Number527 Instrument: MST Radar. The radar suffered from intermittent interference. This did not cause any contamination of the wind-profile data.
Start2010-03-07 05:30
End2010-03-07 08:00
Added2010-03-15 11:38
AuthorDAH

[Data]
Number528 Instrument: MST Radar. The radar suffered from a period of interference. This did not contaminate the wind-profile data.
Start2010-03-08 06:30
End2010-03-08 09:30
Added2010-03-15 11:43
AuthorDAH

[Data]
Number522 Instrument: MST Radar. The radar suffered from a period of interference. This did not cause any contamination of the wind-profile data.
Start2010-03-13 05:00
End2010-03-13 08:45
Added2010-03-15 08:17
AuthorDAH

[Data]
Number529 Instrument: MST Radar. The radar suffered from non-continuous interference during this period. The wind-profile data were not contaminated.
Start2010-03-15 03:00
End2010-03-15 10:50
Added2010-03-16 08:04
AuthorDAH

[Data]
Number530 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.
Start2010-03-15 21:00
End2010-03-16 11:15
Added2010-03-18 09:28
AuthorDAH

[Data]
Number531 Instrument: MST Radar. The radar suffered from intermittent interference during this period. This did not cause any contamination of the wind-profile data.
Start2010-03-20 19:40
End2010-03-21 09:20
Added2010-03-22 08:48
AuthorDAH

[Data]
Number533 Instrument: MST Radar. The radar suffered from intermittent interference during this period. This does not appear to have contaminated the wind-profile data.
Start2010-03-22 21:10
End2010-03-23 08:55
Added2010-03-29 14:57
AuthorZKO

[Data]
Number532 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.
Start2010-03-23 10:30
End2010-03-23 12:30
Added2010-03-29 14:54
AuthorDAH

[Data]
Number536 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.
Start2010-03-23 11:59
End2010-03-23 12:00
Added2010-03-29 15:04
AuthorDAH

[Data]
Number534 Instrument: MST Radar. The radar suffered from intermittent interference during this period. This does not appear to have contaminated the wind-profile data.
Start2010-03-23 13:50
End2010-03-24 02:20
Added2010-03-29 14:59
AuthorDAH

[Data]
Number535 Instrument: MST Radar. LD powered up one of the TXs, which had auto-powered down at some indeterminate point during the previous 24 hours.
Start2010-03-24 11:29
End2010-03-24 11:30
Added2010-03-29 15:02
AuthorDAH

[Data]
Number540 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.
Start2010-03-24 16:30
End2010-03-24 17:00
Added2010-03-29 16:25
AuthorDAH

[Data]
Number537 Instrument: MST Radar. LD powered down TX5 in order to carry out maintenance work on it.
Start2010-03-26 10:00
End2010-03-26 11:00
Added2010-03-29 15:09
AuthorDAH

[Data]
Number538 Instrument: MST Radar. The radar suffered from intermittent interference during this period.
Start2010-03-27 20:00
End2010-03-27 21:00
Added2010-03-29 15:18
AuthorDAH

[Data]
Number539 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.
Start2010-03-28 01:00
End2010-03-28 02:00
Added2010-03-29 15:35
AuthorDAH

[Data]
Number541 Instrument: MST Radar. The radar suffered from intermittent interference during this period. The wind-profile data do not appear to have been contaminated.
Start2010-03-28 03:00
End2010-03-28 10:45
Added2010-03-30 09:07
AuthorDAH

[Data]
Number542 Instrument: MST Radar. The radar suffered from intermittent interference during this period. This does not appear to have contaminated the wind-profile data.
Start2010-03-28 19:00
End2010-03-29 06:00
Added2010-03-30 09:08
AuthorDAH

[Data]
Number543 Instrument: MST Radar. The radar suffered from an isolated incidence of interference. This did not contaminate the wind-profile data.
Start2010-03-30 12:30
End2010-03-30 12:50
Added2010-03-31 09:46
AuthorDAH

[Data]
Number544 Instrument: MST Radar. The radar suffered from some minor, non-continuous interference during this period. This did not contaminate the wind-profile data.
Start2010-04-02 21:50
End2010-04-02 23:59
Added2010-04-06 08:44
AuthorDAH

[Data]
Number545 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.
Start2010-04-10 08:53
End2010-04-14 16:26
Added2010-04-12 15:31
AuthorDAH

[Data]
Number546 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.
Start2010-04-25 01:00
End2010-04-25 13:00
Added2010-04-26 08:23
AuthorDAH

[Data]
Number547 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.
Start2010-05-01 14:10
End2010-05-02 00:40
Added2010-05-04 08:35
AuthorDAH

[Data]
Number548 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.
Start2010-05-05 06:00
End2010-05-05 15:50
Added2010-05-06 08:08
AuthorDAH

[Data]
Number550 Instrument: Vaisala WXT510. This instrument failed to detect a (non-continuous) mild rain event which was recorded by the tipping bucket rain gauge.
Start2010-05-14 00:20
End2010-05-14 13:40
Added2010-05-17 08:19
AuthorDAH

[Data]
Number549 Instrument: Vaisala WXT510. This instrument failed to detect a mild rain event, which was detected by the tipping bucket rain gauge.
Start2010-05-16 00:30
End2010-05-16 05:10
Added2010-05-17 08:16
AuthorDAH

[Data]
Number551 Instrument: MST Radar. The radar was powered down to allow LD to carry out work on the locking transmitter.
Start2010-05-18 09:10
End2010-05-18 10:30
Added2010-05-19 08:19
AuthorDAH

[Data]
Number552 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.
Start2010-05-20 00:00
End2010-05-28 16:00
Added2010-06-03 10:02
AuthorDAH

[Data]
Number553 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.
Start2010-05-25 09:00
End2010-05-25 10:18
Added2010-06-03 10:16
AuthorDAH

[Data]
Number554 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.
Start2010-05-25 21:50
End2010-05-25 23:30
Added2010-06-03 10:20
AuthorDAH

[Data]
Number555 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.
Start2010-05-27 17:55
End2010-05-27 18:15
Added2010-06-03 11:25
AuthorDAH

[Data]
Number556 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.
Start2010-05-27 21:30
End2010-05-27 22:30
Added2010-06-03 11:31
AuthorDAH

[Data]
Number557 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.
Start2010-05-28 10:00
End2010-05-28 14:30
Added2010-06-03 11:37
AuthorDAH

[Data]
Number558 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.
Start2010-05-31 10:30
End2010-05-31 14:00
Added2010-06-03 11:41
AuthorDAH

[Data]
Number559 Instrument: MST Radar. The radar suffered from a brief period of interference. This caused some contamination of the wind-profile data.
Start2010-06-01 14:45
End2010-06-01 15:45
Added2010-06-03 11:45
AuthorDAH

[Data]
Number560 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.
Start2010-06-03 14:55
End2010-06-03 20:00
Added2010-06-04 08:41
AuthorDAH

[Data]
Number562 Instrument: MST Radar. The radar suffered from a brief period of interference. This did not cause any contamination of the wind-profile data.
Start2010-06-05 11:50
End2010-06-05 12:45
Added2010-06-10 09:36
AuthorDAH

[Data]
Number561 Instrument: UPS units. The UPS units indicated a short-lived fluctuation in mains power. This does not appear to have had any further effects.
Start2010-06-06 09:07
End2010-06-06 09:08
Added2010-06-06 15:33
AuthorDAH

[Data]
Number563 Instrument: MST Radar. The radar suffered from a brief period of interference. This caused some contamination of the wind-profile data.
Start2010-06-07 09:30
End2010-06-07 10:30
Added2010-06-10 09:41
AuthorDAH

[Data]
Number564 Instrument: MST Radar. The radar was powered down to allow a survey of the antenna array to be conducted.
Start2010-06-07 13:00
End2010-06-07 16:30
Added2010-06-10 09:43
AuthorDAH

[Data]
Number565 Instrument: MST Radar. The radar was powered down to allow a survey of the antenna array to be conducted.
Start2010-06-08 08:30
End2010-06-08 18:00
Added2010-06-10 09:45
AuthorDAH

[Data]
Number568 Instrument: Vaisala WXT510. There is a gap in data capture owing to the acquisition PC, "augustus", being rebooted.
Start2010-06-08 10:37
End2010-06-08 12:51
Added2010-06-11 08:24
AuthorDAH

[Data]
Number567 Instrument: Sky-Camera. There is a gap in image capture owing to the acquisition PC, "claudius", being rebooted.
Start2010-06-08 10:40
End2010-06-08 12:14
Added2010-06-11 08:20
AuthorDAH

[Data]
Number566 Instrument: MST Radar. The radar was powered down to allow a survey of the antenna array to be conducted.
Start2010-06-09 08:00
End2010-06-09 13:00
Added2010-06-10 09:48
AuthorDAH

[Data]
Number569 Instrument: MST Radar. LD fixed a blown choke on TX1. It is not known for how long the TX had not been transmitting.
Start2010-06-11 10:30
End2010-06-11 10:30
Added2010-06-14 08:30
AuthorDAH

[Data]
Number570 Instrument: MST Radar. The radar suffered from a brief period of interference, which does not appear to have contaminated the wind-profile data.
Start2010-06-12 20:00
End2010-06-12 21:45
Added2010-06-14 08:32
AuthorDAH

[Data]
Number571 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.
Start2010-06-21 14:45
End2010-06-21 15:55
Added2010-06-22 08:10
AuthorDAH

[Data]
Number572 Instrument: MST Radar. The radar suffered from a brief period of interference. This did not cause any contamination of the wind profile data.
Start2010-06-22 19:15
End2010-06-22 19:35
Added2010-06-24 08:19
AuthorDAH

[Data]
Number573 Instrument: MST Radar. The radar suffered from a brief period of interference, which did not cause contamination of the wind-profile data.
Start2010-06-24 13:00
End2010-06-24 13:45
Added2010-06-25 08:41
AuthorDAH

[Data]
Number574 Instrument: MST Radar. The radar suffered from a brief period of interference, which did not cause contamination of the wind-profile data.
Start2010-06-24 18:50
End2010-06-24 19:10
Added2010-06-25 08:42
AuthorDAH

[Data]
Number575 Instrument: MST Radar. The radar suffered from a period of interference which did not cause any contamination of the wind-profile data.
Start2010-06-26 16:50
End2010-06-26 20:30
Added2010-06-29 08:22
AuthorDAH

[Data]
Number581 Instrument: Campbell Scientific tipping bucket rain gauge. LD cleaned out the instrument, which had become blocked with gunge.
Start2010-06-29 09:00
End2010-06-29 09:00
Added2010-07-08 16:24
AuthorDAH

[Data]
Number578 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.
Start2010-07-01 06:30
End2010-07-01 21:00
Added2010-07-06 08:20
AuthorDAH

[Data]
Number579 Instrument: UPS. The UPS units indicate a brief disruption in the mains electricity supply.
Start2010-07-03 18:41
End2010-07-03 18:42
Added2010-07-06 08:26
AuthorDAH

[Data]
Number576 Instrument: MST Radar. The radar suffered from a brief period of interference, which did not cause any contamination of the wind profile data.
Start2010-07-05 12:00
End2010-07-05 12:40
Added2010-07-06 08:14
AuthorDAH

[Data]
Number577 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
Start2010-07-06 09:30
End2010-07-06 10:00
Added2010-07-06 08:18
AuthorDAH

[Data]
Number580 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.
Start2010-07-06 17:00
End2010-07-06 19:30
Added2010-07-08 10:31
AuthorDAH

[Data]
Number584 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.
Start2010-07-07 11:00
End2010-07-07 11:00
Added2010-07-15 15:30
AuthorDAH

[Data]
Number582 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.
Start2010-07-13 19:40
End2010-07-13 20:10
Added2010-07-14 08:10
AuthorDAH

[Data]
Number583 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.
Start2010-07-14 05:50
End2010-07-14 23:50
Added2010-07-15 10:05
AuthorDAH

[Data]
Number585 Instrument: MST Radar. The radar suffered from a short period of interference. This did not cause any contamination of the wind-profile data.
Start2010-07-18 17:00
End2010-07-18 18:30
Added2010-07-19 08:14
AuthorDAH

[Data]
Number586 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.
Start2010-07-20 00:00
End2010-07-20 22:30
Added2010-07-22 08:54
AuthorDAH

[Data]
Number587 Instrument: Vaisala WXT510. The piezo-electric sensor failed to the detect the intermittent rain that was seen by the tipping bucket rain gauge.
Start2010-07-21 04:00
End2010-07-21 20:30
Added2010-07-22 08:57
AuthorZKO

[Data]
Number588 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.
Start2010-07-27 08:30
End2010-07-27 08:49
Added2010-07-29 08:59
AuthorDAH

[Data]
Number589 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.
Start2010-08-02 08:00
End2010-08-02 14:00
Added2010-08-03 08:49
AuthorDAH

[Data]
Number590 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.
Start2010-08-02 14:50
End2010-08-03 08:00
Added2010-08-03 09:05
AuthorDAH

[Data]
Number592 Instrument: MST Radar. The radar suffered from a very short period of interference. This did not cause any contamination of the wind-profile data.
Start2010-08-03 10:05
End2010-08-03 10:15
Added2010-08-06 08:37
AuthorDAH

[Data]
Number591 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.
Start2010-08-03 11:00
End2010-08-03 11:00
Added2010-08-06 08:35
AuthorDAH

[Data]
Number593 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.
Start2010-08-08 16:30
End2010-08-10 10:10
Added2010-08-10 13:49
AuthorDAH

[Data]
Number594 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.
Start2010-08-17 00:30
End2010-08-17 07:00
Added2010-08-18 08:19
AuthorDAH

[Data]
Number597 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.
Start2010-08-20 00:30
End2010-08-20 09:00
Added2010-08-23 08:28
AuthorDAH

[Data]
Number595 Instrument: UPS units. There was a brief (~ 1s) disruption of the incoming mains electricity.
Start2010-08-20 09:40
End2010-08-20 09:40
Added2010-08-20 11:25
AuthorDAH

[Data]
Number596 Instrument: UPS units. All units indicated a brief (< 1 minute) disruption to the incoming mains electricity.
Start2010-08-22 19:46
End2010-08-22 19:46
Added2010-08-23 08:18
AuthorDAH

[Data]
Number598 Instrument: MST Radar. The radar suffered from a brief period of interference. This did not cause any contamination of the wind profile data.
Start2010-08-28 14:50
End2010-08-28 15:10
Added2010-09-01 08:22
AuthorDAH

[Data]
Number599 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.
Start2010-09-06 12:30
End2010-09-06 17:30
Added2010-09-07 09:01
AuthorDAH

[Data]
Number600 Instruments: UPS units. There was a brief disruption in the incoming mains.
Start2010-09-08 05:45
End2010-09-08 05:45
Added2010-09-08 08:07
AuthorDAH

[Data]
Number601 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.
Start2010-09-17 23:25
End2010-09-17 23:55
Added2010-09-20 09:33
AuthorDAH

[Data]
Number602 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.
Start2010-09-18 17:00
End2010-09-20 11:15
Added2010-09-20 09:36
AuthorDAH

[Data]
Number603 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.
Start2010-09-28 09:00
End2010-09-28 11:00
Added2010-09-29 08:17
AuthorDAH

[Data]
Number604 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.
Start2010-09-30 10:50
End2010-09-30 13:31
Added2010-09-30 15:50
AuthorDAH

[Data]
Number605 Instrument: UPS units. All units indicated a brief dip in the incoming mains voltage. This did not cause any disruptions for the other equipment.
Start2010-11-02 09:15
End2010-11-02 09:15
Added2010-11-02 11:50
AuthorDAH

[Data]
Number606 Instrument: UPS units. All units indicated a brief irregularity in the incoming mains voltage. This did not cause any disruptions for the other equipment.
Start2010-11-02 12:29
End2010-11-02 12:29
Added2010-11-02 13:52
AuthorDAH

[Data]
Number607 Instrument: UPS units. All units indicated a brief irregularity in the incoming mains voltage. This did not cause any disruptions for the other equipment.
Start2010-11-02 13:15
End2010-11-02 13:15
Added2010-11-02 13:53
AuthorDAH

[Data]
Number608 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.
Start2010-11-09 09:30
End2010-11-10 10:30
Added2010-11-11 08:37
AuthorDAH

[Data]
Number609 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.
Start2010-11-10 07:00
End2010-11-10 19:00
Added2010-11-11 08:43
AuthorDAH

[Data]
Number610 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.
Start2010-11-16 13:58
End2010-11-16 15:30
Added2010-11-16 16:00
AuthorDAH

[Data]
Number611 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.
Start2010-11-28 07:00
End2010-11-28 09:30
Added2010-11-29 09:27
AuthorDAH

[Data]
Number612 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.
Start2010-11-29 08:45
End2010-11-29 11:15
Added2010-12-06 09:00
AuthorDAH

[Data]
Number617 Instrument: Vaisala LD40 Laser Ceilometer. There is a gap in the recorded data. The cause of this remains unknown.
Start2010-11-29 13:40
End2010-11-29 17:00
Added2010-12-06 11:40
AuthorDAH

[Data]
Number613 Instrument: MST Radar. The radar was powered down so that safety testing could be carried out on the electricity supply cables.
Start2010-12-01 09:43
End2010-12-01 11:44
Added2010-12-06 09:22
AuthorDAH

[Data]
Number615 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.
Start2010-12-01 09:52
End2010-12-06 09:36
Added2010-12-06 09:40
AuthorDAH

[Data]
Number619 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.
Start2010-12-01 10:00
End2010-12-01 10:58
Added2010-12-06 11:54
AuthorDAH

[Data]
Number618 Instrument: Vaisala LD40 Laser Ceilometer. There is a gap in the recorded data. The cause of this remains unknown.
Start2010-12-01 14:10
End2010-12-01 15:00
Added2010-12-06 11:41
AuthorDAH

[Data]
Number706 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).
Start2010-12-03 00:00
End2010-12-03 12:00
Added2012-01-23 11:36
AuthorDAH

[Data]
Number614 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.
Start2010-12-03 04:15
End2010-12-03 08:00
Added2010-12-06 09:28
AuthorDAH

[Data]
Number616 Instrument: MST Radar. The radar suffered from a period of interference, which did not cause any contamination of the wind-profile data.
Start2010-12-07 03:10
End2010-12-07 07:30
Added2010-12-06 11:38
AuthorDAH

[Data]
Number620 Instrument: MST Radar. The radar suffered from a period of interference, which may have caused some slight contamination of the wind-profile data.
Start2010-12-08 05:00
End2010-12-08 09:30
Added2010-12-09 08:48
AuthorDAH

[Data]
Number621 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.
Start2010-12-08 22:00
End2010-12-09 11:30
Added2010-12-10 08:09
AuthorDAH

[Data]
Number622 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.
Start2010-12-20 12:30
End2010-12-21 15:00
Added2011-01-04 12:23
AuthorDAH

[Data]
Number623 Instrument: UPS units. All UPS indicated a brief fluctuation in input mains voltage. This did not affect the operation of any other equipment.
Start2011-01-11 03:57
End2011-01-11 03:57
Added2011-01-11 08:10
AuthorDAH

[Data]
Number625 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.
Start2011-01-11 14:00
End2011-01-11 17:00
Added2011-01-13 08:33
AuthorDAH

[Data]
Number624 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.
Start2011-01-12 15:59
End2011-01-12 15:59
Added2011-01-13 08:30
AuthorDAH

[Data]
Number627 Instrument: Vaisala WXT510 Met and Wind Sensors. There is a 90 minute gap in data acquisition. The cause for this is unclear.
Start2011-01-19 11:13
End2011-01-19 12:45
Added2011-01-21 08:43
AuthorZKO

[Data]
Number626 Instrument: UPS units. All units indicated a brief irregularity in incoming mains electricity. This should not have affected any of the other equipment.
Start2011-01-19 14:16
End2011-01-19 14:16
Added2011-01-19 15:53
AuthorDAH

[Data]
Number628 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.
Start2011-01-20 11:44
End2011-01-20 12:32
Added2011-01-21 08:47
AuthorDAH

[Data]
Number629 Instrument: UPS units. All units indicated a brief irregularity in incoming mains electricity. This should not have affected any of the other equipment.
Start2011-01-26 11:29
End2011-01-26 11:29
Added2011-01-26 11:55
AuthorDAH

[Data]
Number630 Instrument: UPS units. All units indicated a brief irregularity in incoming mains electricity. This should not have affected any of the other equipment.
Start2011-02-05 01:24
End2011-02-05 01:24
Added2011-02-07 08:27
AuthorDAH

[Data]
Number631 Instrument: UPS units. All units indicated a brief irregularity in incoming mains electricity. This should not have affected any of the other equipment.
Start2011-02-05 09:47
End2011-02-05 09:47
Added2011-02-07 08:27
AuthorDAH

[Data]
Number676 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.
Start2011-02-09 09:44
End2011-02-28 11:03
Added2011-07-04 11:19
AuthorDAH

[Data]
Number632 Instrument: MST Radar. The radar was powered down whilst voltage optimisation equipment was installed on the site's electricity supply.
Start2011-02-15 09:22
End2011-02-15 17:13
Added2011-02-16 08:23
AuthorDAH

[Data]
Number638 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.
Start2011-02-15 09:37
End2011-02-16 08:02
Added2011-03-18 10:32
AuthorZKO

[Data]
Number633 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.
Start2011-02-15 09:38
End2011-02-15 12:12
Added2011-02-16 08:50
AuthorDAH

[Data]
Number634 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.
Start2011-02-15 09:48
End2011-02-15 15:17
Added2011-02-16 11:52
AuthorDAH

[Data]
Number637 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.
Start2011-02-15 09:52
End2011-02-15 14:59
Added2011-03-18 09:52
AuthorDAH

[Data]
Number635 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.
Start2011-03-05 04:19
End2011-03-05 09:27
Added2011-03-05 09:54
AuthorDAH

[Data]
Number646 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.
Start2011-03-07 15:00
End2011-05-03 07:20
Added2011-05-05 08:33
AuthorDAH

[Data]
Number636 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.
Start2011-03-12 13:11
End2011-03-12 14:56
Added2011-03-12 16:59
AuthorDAH

[Data]
Number639 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.
Start2011-03-12 14:52
End2011-03-14 10:36
Added2011-03-18 11:18
AuthorDAH

[Data]
Number640 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.
Start2011-03-16 13:06
End2011-03-17 08:13
Added2011-03-18 11:22
AuthorDAH

[Data]
Number641 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.
Start2011-04-07 08:05
End2011-04-07 17:00
Added2011-04-11 08:40
AuthorDAH

[Data]
Number644 Instrument: Vaisala LD40 Ceilometer. No data were captured whilst the power was down in the site bungalow.
Start2011-04-07 08:05
End2011-04-07 14:11
Added2011-04-11 08:54
AuthorDAH

[Data]
Number645 Instrument: Vaisala WXT510 surface met and wind sensors. No data were captured whilst the power was down in the site bungalow.
Start2011-04-07 08:16
End2011-04-07 14:12
Added2011-04-11 08:56
AuthorDAH

[Data]
Number643 Instrument: Sky-Camera. No images were captured whilst the electricity supply to the site bungalow was down.
Start2011-04-07 08:20
End2011-04-07 14:34
Added2011-04-11 08:46
AuthorDAH

[Data]
Number642 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.
Start2011-04-07 08:45
End2011-04-07 14:30
Added2011-04-11 08:44
AuthorDAH

[Data]
Number647 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.
Start2011-05-06 23:20
End2011-05-09 08:30
Added2011-05-09 15:07
AuthorDAH

[Data]
Number648 Instrument: UPS units. The units indicate a brief disruption in the electricity supply. This did not affect any of the equipment.
Start2011-05-13 06:56
End2011-05-13 06:56
Added2011-05-13 08:05
AuthorDAH

[Data]
Number649 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.
Start2011-05-21 11:00
End2011-05-21 15:00
Added2011-05-23 08:11
AuthorDAH

[Data]
Number650 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.
Start2011-05-22 02:20
End2011-05-24 10:00
Added2011-05-27 16:21
AuthorDAH

[Data]
Number651 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.
Start2011-06-01 07:03
End2011-06-01 07:03
Added2011-06-01 08:12
AuthorDAH

[Data]
Number653 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.
Start2011-06-03 16:30
End2011-06-03 20:30
Added2011-06-06 08:33
AuthorDAH

[Data]
Number652 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.
Start2011-06-04 15:30
End2011-06-04 19:00
Added2011-06-06 08:15
AuthorDAH

[Data]
Number655 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.
Start2011-06-07 00:00
End2011-06-07 23:59
Added2011-06-09 12:12
AuthorDAH

[Data]
Number654 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.
Start2011-06-07 22:20
End2011-06-08 14:00
Added2011-06-09 08:37
AuthorDAH

[Data]
Number656 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.
Start2011-06-10 13:00
End2011-06-10 13:30
Added2011-06-13 08:08
AuthorDAH

[Data]
Number657 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.
Start2011-06-10 17:00
End2011-06-10 18:30
Added2011-06-13 08:10
AuthorDAH

[Data]
Number658 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.
Start2011-06-11 17:30
End2011-06-11 19:45
Added2011-06-13 08:18
AuthorDAH

[Data]
Number659 Instrument: MST Radar. The radar experienced a short period of interference. This did not cause any contamination of the wind profile data.
Start2011-06-13 16:30
End2011-06-13 17:00
Added2011-06-14 08:03
AuthorDAH

[Data]
Number660 Instrument: MST Radar. The radar experienced a brief period of interference. This did not cause any contamination of the wind-profile data.
Start2011-06-14 08:10
End2011-06-14 08:45
Added2011-06-15 08:12
AuthorDAH

[Data]
Number661 Instrument: MST Radar. The radar experienced a brief period of interference. This did not cause any contamination of the wind-profile data.
Start2011-06-14 14:00
End2011-06-14 14:30
Added2011-06-15 08:12
AuthorZKO

[Data]
Number662 Instrument: MST Radar. The radar experienced a brief period of interference. This did not cause any contamination of the wind-profile data.
Start2011-06-14 22:30
End2011-06-14 22:45
Added2011-06-15 08:13
AuthorDAH

[Data]
Number667 Instrument: MST Radar. The radar experienced a short period of interference, which did not cause any contamination of the wind-profile data.
Start2011-06-15 13:30
End2011-06-15 14:15
Added2011-06-23 08:42
AuthorDAH

[Data]
Number663 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.
Start2011-06-16 01:00
End2011-06-16 11:00
Added2011-06-16 12:04
AuthorDAH

[Data]
Number664 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.
Start2011-06-16 18:15
End2011-06-16 20:00
Added2011-06-17 08:05
AuthorDAH

[Data]
Number665 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.
Start2011-06-17 21:20
End2011-06-18 13:40
Added2011-06-21 09:31
AuthorDAH

[Data]
Number666 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.
Start2011-06-19 17:00
End2011-06-19 17:00
Added2011-06-23 08:34
AuthorDAH

[Data]
Number668 Instrument: MST Radar. The radar experienced a short period of interference, which did not cause any contamination of the wind-profile data.
Start2011-06-22 15:00
End2011-06-22 15:30
Added2011-06-23 08:49
AuthorDAH

[Data]
Number669 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.
Start2011-06-24 08:09
End2011-06-24 08:09
Added2011-06-24 09:10
AuthorDAH

[Data]
Number670 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.
Start2011-06-26 15:45
End2011-06-26 21:30
Added2011-06-27 08:31
AuthorDAH

[Data]
Number671 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.
Start2011-06-27 07:30
End2011-06-27 20:00
Added2011-06-28 14:50
AuthorDAH

[Data]
Number672 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.
Start2011-06-28 04:33
End2011-06-28 09:38
Added2011-06-28 14:53
AuthorDAH

[Data]
Number673 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.
Start2011-06-28 17:50
End2011-06-28 19:30
Added2011-06-29 08:29
AuthorDAH

[Data]
Number674 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.
Start2011-06-29 14:40
End2011-06-29 15:30
Added2011-06-30 08:09
AuthorDAH

[Data]
Number675 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.
Start2011-07-02 14:30
End2011-07-02 14:50
Added2011-07-04 08:07
AuthorDAH

[Data]
Number677 Instrument: MST Radar. The radar experienced a brief period of interference. This did not cause any contamination of the wind-profile data.
Start2011-07-05 04:30
End2011-07-05 05:10
Added2011-07-07 08:28
AuthorDAH

[Data]
Number678 Instrument: MST Radar. The radar experienced a brief period of interference. This did not cause any contamination of the wind-profile data.
Start2011-07-07 19:00
End2011-07-07 19:30
Added2011-07-08 08:21
AuthorDAH

[Data]
Number679 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.
Start2011-07-08 12:00
End2011-07-08 13:00
Added2011-07-11 09:14
AuthorDAH

[Data]
Number680 Instrument: MST Radar. The radar experienced a brief period of interference. This did not cause any contamination of the wind-profile data.
Start2011-07-09 11:00
End2011-07-09 11:30
Added2011-07-11 09:17
AuthorDAH

[Data]
Number681 Instrument: MST Radar. The radar experienced a brief period of interference. This did not cause any contamination of the wind-profile data.
Start2011-07-09 23:20
End2011-07-09 23:40
Added2011-07-11 09:18
AuthorDAH

[Data]
Number682 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.
Start2011-07-12 08:30
End2011-07-12 15:00
Added2011-07-13 08:34
AuthorZKO

[Data]
Number683 Instrument: MST Radar. The radar was powered down in order to allow weed spraying to be carried out within the antenna array.
Start2011-07-14 11:00
End2011-07-14 13:00
Added2011-07-15 08:20
AuthorDAH

[Data]
Number709 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.
Start2011-07-16 15:00
End2011-07-19 11:00
Added2012-01-23 12:10
AuthorDAH

[Data]
Number684 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.
Start2011-07-16 18:30
End2011-07-17 00:30
Added2011-07-18 10:09
AuthorDAH

[Data]
Number713 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.
Start2011-07-17 00:00
End2011-08-11 23:59
Added2012-01-23 14:42
AuthorDAH

[Data]
Number685 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".
Start2011-08-01 12:02
End2011-08-01 12:02
Added2011-08-01 13:52
AuthorDAH

[Data]
Number707 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.
Start2011-08-06 00:00
End2011-08-06 12:00
Added2012-01-23 11:42
AuthorDAH

[Data]
Number710 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.
Start2011-08-16 10:00
End2011-08-16 11:00
Added2012-01-23 12:23
AuthorDAH

[Data]
Number686 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.
Start2011-08-20 00:30
End2011-08-22 14:30
Added2011-08-22 08:19
AuthorDAH

[Data]
Number687 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.
Start2011-09-22 15:00
End2011-09-23 08:30
Added2011-09-23 11:51
AuthorDAH

[Data]
Number688 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.
Start2011-09-26 00:00
End2011-09-27 09:00
Added2011-09-30 09:49
AuthorDAH

[Data]
Number689 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.
Start2011-09-27 13:30
End2011-09-28 09:00
Added2011-09-30 09:52
AuthorDAH

[Data]
Number690 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.
Start2011-10-13 06:00
End2011-10-15 18:00
Added2011-10-21 08:34
AuthorDAH

[Data]
Number1886 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.
Start2011-10-15 18:20
End2011-10-15 19:00
Added2017-09-22 12:01
AuthorDAH

[Data]
Number691 Instrument: Campbell Scientific wind sensors. There was again a period of missing data. The cause of the problem is not known.
Start2011-10-16 04:45
End2011-10-16 13:00
Added2011-10-21 08:37
AuthorDAH

[Data]
Number1887 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.
Start2011-10-21 17:00
End2011-10-21 17:50
Added2017-09-22 12:05
AuthorDAH

[Data]
Number1888 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.
Start2011-10-22 14:20
End2011-10-22 15:10
Added2017-09-22 12:10
AuthorDAH

[Data]
Number692 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.
Start2011-10-30 10:45
End2011-10-31 09:15
Added2011-11-01 08:19
AuthorDAH

[Data]
Number693 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.
Start2011-11-01 11:30
End2011-11-01 11:45
Added2011-11-03 10:02
AuthorDAH

[Data]
Number708 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.
Start2011-11-04 11:30
End2011-11-04 11:40
Added2012-01-23 11:49
AuthorDAH

[Data]
Number694 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.
Start2011-11-08 11:20
End2011-11-08 11:50
Added2011-11-08 14:33
AuthorDAH

[Data]
Number695 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.
Start2011-11-11 10:15
End2011-11-11 11:00
Added2011-11-14 08:15
AuthorDAH

[Data]
Number696 Instrument: UPS units. All units indicated a brief irregularity in the incoming electricity.
Start2011-11-12 03:13
End2011-11-12 03:13
Added2011-11-14 08:22
AuthorDAH

[Data]
Number697 Instrument: MST Radar. The radar was powered down to allow LD to carry out tests on some of the Yagis within the antenna array.
Start2011-11-15 11:00
End2011-11-15 11:30
Added2011-11-15 13:42
AuthorDAH

[Data]
Number711 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.
Start2011-11-15 14:00
End2011-11-15 16:30
Added2012-01-23 12:35
AuthorDAH

[Data]
Number776 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.
Start2011-11-16 01:15
End2011-11-16 12:15
Added2012-06-06 11:34
AuthorDAH

[Data]
Number698 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.
Start2011-11-22 10:30
End2011-11-22 15:30
Added2011-11-25 14:02
AuthorDAH

[Data]
Number699 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.
Start2011-11-29 10:00
End2011-11-29 14:00
Added2011-12-01 08:21
AuthorDAH

[Data]
Number700 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.
Start2011-12-21 04:21
End2011-12-21 04:21
Added2011-12-21 08:13
AuthorDAH

[Data]
Number701 Instrument: UPS units. The units inidicated that they were on battery power for approximately 20 s in response to a mains input problem.
Start2011-12-21 10:02
End2011-12-21 10:02
Added2011-12-21 10:13
AuthorDAH

[Data]
Number702 Instrument: UPS units. All units inidicated that there was a disruption in the mains electricity supply which lasted for approximately 12 s.
Start2011-12-22 19:46
End2011-12-22 19:46
Added2012-01-03 08:25
AuthorDAH

[Data]
Number1889 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.
Start2011-12-26 13:50
End2011-12-26 14:40
Added2017-09-22 13:43
AuthorDAH

[Data]
Number703 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.
Start2012-01-03 08:34
End2012-01-05 01:21
Added2012-01-09 08:38
AuthorDAH

[Data]
Number704 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.
Start2012-01-10 10:30
End2012-01-10 11:00
Added2012-01-10 11:08
AuthorDAH

[Data]
Number705 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.
Start2012-01-19 16:50
End2012-01-20 11:20
Added2012-01-20 13:46
AuthorDAH

[Data]
Number714 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.
Start2012-01-21 00:00
End2012-01-21 22:00
Added2012-01-27 08:42
AuthorDAH

[Data]
Number712 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.
Start2012-01-25 10:30
End2012-01-25 14:00
Added2012-01-23 14:18
AuthorDAH

[Data]
Number716 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.
Start2012-02-05 00:00
End2012-02-06 09:40
Added2012-02-07 15:26
AuthorDAH

[Data]
Number717 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.
Start2012-02-05 00:00
End2012-02-09 09:45
Added2012-02-13 08:25
AuthorDAH

[Data]
Number715 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.
Start2012-02-05 00:50
End2012-02-06 15:30
Added2012-02-07 15:21
AuthorDAH

[Data]
Number719 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.
Start2012-02-08 19:00
End2012-02-09 10:20
Added2012-02-13 08:43
AuthorDAH

[Data]
Number718 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.
Start2012-02-10 10:20
End2012-02-10 11:20
Added2012-02-13 08:35
AuthorDAH

[Data]
Number720 Instrument: UPS units. All units indicated a 5 s disruption of the mains electricity.
Start2012-02-13 08:52
End2012-02-13 08:52
Added2012-02-13 09:04
AuthorDAH

[Data]
Number721 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.
Start2012-02-16 14:00
End2012-02-16 20:00
Added2012-02-17 08:22
AuthorDAH

[Data]
Number725 Instrument: Vaisala LD40. There are a few short gaps in the recorded data for this period. The reason is unknown.
Start2012-02-16 16:30
End2012-02-16 18:10
Added2012-02-21 09:35
AuthorDAH

[Data]
Number723 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.
Start2012-02-17 09:45
End2012-02-17 10:00
Added2012-02-21 09:13
AuthorDAH

[Data]
Number726 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.
Start2012-02-18 07:00
End2012-02-18 23:59
Added2012-02-21 09:38
AuthorDAH

[Data]
Number727 Instrument: Vaisala LD40. There are two short gaps in the recorded data for this period. The reason for this is unknown.
Start2012-02-19 01:40
End2012-02-19 02:45
Added2012-02-21 09:39
AuthorDAH

[Data]
Number722 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.
Start2012-02-19 06:20
End2012-02-20 09:45
Added2012-02-20 11:38
AuthorDAH

[Data]
Number724 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.
Start2012-02-20 04:20
End2012-02-20 08:45
Added2012-02-21 09:24
AuthorDAH

[Data]
Number728 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.
Start2012-02-26 04:00
End2012-02-26 04:50
Added2012-02-27 08:16
AuthorDAH

[Data]
Number729 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.
Start2012-02-27 15:15
End2012-02-27 17:30
Added2012-02-28 08:35
AuthorDAH

[Data]
Number730 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.
Start2012-03-02 06:40
End2012-03-02 10:00
Added2012-03-05 08:19
AuthorDAH

[Data]
Number731 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.
Start2012-03-02 23:00
End2012-03-02 23:50
Added2012-03-05 08:24
AuthorDAH

[Data]
Number732 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.
Start2012-03-08 11:55
End2012-03-08 15:38
Added2012-03-09 08:13
AuthorDAH

[Data]
Number733 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.
Start2012-03-08 12:06
End2012-03-08 14:45
Added2012-03-09 08:20
AuthorDAH

[Data]
Number734 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.
Start2012-03-09 10:00
End2012-03-09 14:20
Added2012-03-12 08:31
AuthorDAH

[Data]
Number735 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.
Start2012-03-12 08:20
End2012-03-12 10:40
Added2012-03-13 08:14
AuthorDAH

[Data]
Number737 Instrument: MST Radar. The radar suffered intermittently from a raised noise floor, caused by transmitter TX1 going down.
Start2012-03-12 19:30
End2012-03-13 09:42
Added2012-03-16 08:42
AuthorDAH

[Data]
Number738 Instrument: MST Radar. The radar was powered down to allow the huts housing the primary power splitters to be replaced.
Start2012-03-13 09:42
End2012-03-13 16:24
Added2012-03-16 08:43
AuthorDAH

[Data]
Number739 Instrument: MST Radar. The radar was powered down to allow the huts housing the primary power splitters to be replaced.
Start2012-03-14 09:50
End2012-03-14 15:50
Added2012-03-30 13:18
AuthorDAH

[Data]
Number740 Instrument: MST Radar. The radar was powered down to allow the huts housing the primary power splitters to be replaced.
Start2012-03-15 09:30
End2012-03-15 16:30
Added2012-03-30 13:21
AuthorDAH

[Data]
Number736 Instrument: Vaisala WXT510. A gap in data coverage resulted from the acquisition PC, augustus, needing to be rebooted.
Start2012-03-15 09:55
End2012-03-15 12:56
Added2012-03-16 08:32
AuthorDAH

[Data]
Number741 Instrument: MST Radar. The radar was powered down to allow the huts housing the primary power splitters to be replaced.
Start2012-03-16 10:05
End2012-03-16 11:46
Added2012-03-30 13:23
AuthorDAH

[Data]
Number742 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.
Start2012-03-16 18:00
End2012-03-17 15:00
Added2012-03-30 13:30
AuthorDAH

[Data]
Number743 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.
Start2012-03-16 23:20
End2012-03-17 14:30
Added2012-03-30 13:34
AuthorDAH

[Data]
Number744 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.
Start2012-03-17 17:00
End2012-03-18 15:30
Added2012-03-30 13:39
AuthorDAH

[Data]
Number745 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.
Start2012-03-23 12:00
End2012-03-23 12:00
Added2012-03-30 13:41
AuthorDAH

[Data]
Number746 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.
Start2012-03-27 08:50
End2012-03-27 15:00
Added2012-03-30 13:43
AuthorDAH

[Data]
Number747 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.
Start2012-03-28 09:55
End2012-03-28 15:10
Added2012-03-30 13:45
AuthorDAH

[Data]
Number748 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.
Start2012-03-30 13:51
End2012-03-30 15:51
Added2012-04-02 10:03
AuthorDAH

[Data]
Number749 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.
Start2012-04-02 19:30
End2012-04-11 08:45
Added2012-04-13 15:01
AuthorDAH

[Data]
Number750 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.
Start2012-04-11 07:55
End2012-04-11 08:44
Added2012-04-13 15:11
AuthorDAH

[Data]
Number751 Instrument: MST Radar. The radar was again stopped for a short period to allow an ATRAD engineer to update the beam steering software.
Start2012-04-11 11:45
End2012-04-11 12:07
Added2012-04-13 15:12
AuthorDAH

[Data]
Number752 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.
Start2012-04-16 19:00
End2012-04-16 22:20
Added2012-04-17 09:25
AuthorDAH

[Data]
Number753 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.
Start2012-04-17 12:52
End2012-04-17 14:08
Added2012-04-19 08:26
AuthorDAH

[Data]
Number754 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.
Start2012-04-19 03:25
End2012-04-19 13:12
Added2012-04-20 08:09
AuthorDAH

[Data]
Number755 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.
Start2012-04-26 10:14
End2012-04-26 10:59
Added2012-04-27 08:12
AuthorDAH

[Data]
Number756 Instrument: MST Radar. The transmitter for antenna sector A went down, causing a raised noise floor and a reduction is useful altitude coverage.
Start2012-04-27 18:02
End2012-04-29 17:05
Added2012-04-30 08:15
AuthorDAH

[Data]
Number757 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.
Start2012-04-28 11:57
End2012-04-28 11:57
Added2012-04-30 08:35
AuthorDAH

[Data]
Number758 Instrument: MST Radar. The transmitter for antenna sector A went down, which caused a raised noise floor and a reduction in useful altitude coverage.
Start2012-04-30 01:53
End2012-04-30 14:16
Added2012-05-01 08:08
AuthorDAH

[Data]
Number759 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.
Start2012-05-07 09:33
End2012-05-08 08:26
Added2012-05-10 08:24
AuthorDAH

[Data]
Number760 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.
Start2012-05-11 21:15
End2012-05-15 09:38
Added2012-05-15 09:44
AuthorDAH

[Data]
Number761 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.
Start2012-05-15 09:00
End2012-05-17 01:30
Added2012-05-18 08:12
AuthorDAH

[Data]
Number762 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.
Start2012-05-17 01:30
End2012-05-17 08:53
Added2012-05-18 08:15
AuthorDAH

[Data]
Number763 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.
Start2012-05-18 04:28
End2012-05-18 10:46
Added2012-05-21 08:22
AuthorDAH

[Data]
Number764 Instrument: Tipping bucket rainguage. The Vaisala WXT510 detected a moderate and prolonged rain event during this period although the tipping bucket rainguage detected nothing.
Start2012-05-18 18:00
End2012-05-18 23:59
Added2012-05-21 08:27
AuthorDAH

[Data]
Number766 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.
Start2012-05-19 06:28
End2012-05-21 08:30
Added2012-05-28 09:53
AuthorDAH

[Data]
Number765 Instrument: UPS units. All units indicated a brief (no more than 1 or 2 s) irregulariry in the incoming voltage.
Start2012-05-19 08:09
End2012-05-19 08:09
Added2012-05-21 08:37
AuthorDAH

[Data]
Number770 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.
Start2012-05-22 09:25
End2012-05-22 09:35
Added2012-05-28 10:04
AuthorDAH

[Data]
Number767 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.
Start2012-05-22 13:39
End2012-05-22 16:58
Added2012-05-28 09:55
AuthorDAH

[Data]
Number768 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.
Start2012-05-22 23:44
End2012-05-23 08:50
Added2012-05-28 09:57
AuthorDAH

[Data]
Number769 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.
Start2012-05-24 08:57
End2012-05-24 13:16
Added2012-05-28 09:59
AuthorDAH

[Data]
Number772 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.
Start2012-05-25 10:00
End2012-07-02 09:00
Added2012-06-06 09:10
AuthorDAH

[Data]
Number773 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.
Start2012-06-01 01:10
End2012-06-01 10:20
Added2012-06-06 09:18
AuthorDAH

[Data]
Number774 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.
Start2012-06-02 19:30
End2012-06-03 00:30
Added2012-06-06 09:22
AuthorDAH

[Data]
Number775 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.
Start2012-06-03 06:00
End2012-06-03 10:10
Added2012-06-06 09:24
AuthorDAH

[Data]
Number771 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.
Start2012-06-04 20:20
End2012-06-05 09:41
Added2012-06-06 09:07
AuthorDAH

[Data]
Number777 Instrument: MST Radar. The transmitter powering antenna sector A went down, causing a raised noise floor and a reduction in useful altitude cover.
Start2012-06-06 17:55
End2012-06-07 11:34
Added2012-06-08 08:15
AuthorDAH

[Data]
Number778 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.
Start2012-06-08 10:30
End2012-06-08 17:02
Added2012-06-11 08:10
AuthorDAH

[Data]
Number779 Instrument: UPS units. The units indicated a brief (i.e. ~ 1 s) irregularity in the incoming mains electricity supply.
Start2012-06-11 15:19
End2012-06-11 15:19
Added2012-06-12 08:27
AuthorDAH

[Data]
Number780 Instrument: MST Radar. The radar suffered from a short period of interference. This lead to a reduction in useful height cover.
Start2012-06-14 14:30
End2012-06-14 15:30
Added2012-06-15 08:10
AuthorDAH

[Data]
Number781 Instrument: UPS units. The units indicated a brief (~ 1s) input power problem.
Start2012-06-18 05:31
End2012-06-18 05:31
Added2012-06-18 08:07
AuthorDAH

[Data]
Number782 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.
Start2012-06-22 11:21
End2012-06-22 11:37
Added2012-06-22 14:58
AuthorDAH

[Data]
Number784 Instrument: Tipping bucket raingauge. This instrument failed to detect an intense rainfall event, which was seen by the WXT510 piezo-electric sensor.
Start2012-06-26 08:10
End2012-06-26 09:50
Added2012-06-28 08:20
AuthorDAH

[Data]
Number786 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.
Start2012-06-26 08:10
End2012-06-29 10:00
Added2012-06-29 11:04
AuthorDAH

[Data]
Number783 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.
Start2012-06-26 09:55
End2012-06-26 10:14
Added2012-06-26 11:24
AuthorDAH

[Data]
Number785 Instrument: Tipping bucket raingauge. This instrument failed to detect a moderately-intense rainfall event, which was seen by the WXT510 piezo-electric sensor.
Start2012-06-28 09:20
End2012-06-28 10:10
Added2012-06-29 08:06
AuthorDAH

[Data]
Number787 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.
Start2012-06-29 16:39
End2012-07-02 09:01
Added2012-07-02 11:48
AuthorDAH

[Data]
Number788 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.
Start2012-07-03 15:21
End2012-07-04 10:10
Added2012-07-05 09:07
AuthorDAH

[Data]
Number789 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.
Start2012-07-06 08:25
End2012-07-06 08:38
Added2012-07-06 11:44
AuthorDAH

[Data]
Number790 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.
Start2012-07-08 17:50
End2012-07-08 23:00
Added2012-07-09 08:18
AuthorDAH

[Data]
Number791 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.
Start2012-07-10 18:47
End2012-07-11 08:43
Added2012-07-11 09:54
AuthorDAH

[Data]
Number793 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.
Start2012-07-12 22:31
End2012-07-13 10:29
Added2012-07-16 08:10
AuthorDAH

[Data]
Number792 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.
Start2012-07-13 15:31
End2012-07-14 12:28
Added2012-07-14 14:25
AuthorDAH

[Data]
Number794 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.
Start2012-07-18 22:31
End2012-07-19 13:47
Added2012-07-19 15:05
AuthorDAH

[Data]
Number795 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.
Start2012-07-19 17:47
End2012-07-20 08:24
Added2012-07-23 08:08
AuthorDAH

[Data]
Number796 Instrument: UPS units. The units indicated a brief (< 1 s) irregularity of the incoming mains electricity supply.
Start2012-07-24 10:33
End2012-07-24 10:33
Added2012-07-24 16:14
AuthorDAH

[Data]
Number797 Instrument: UPS units. The units indicated a brief (~ 1 s) irregularity of the incoming electricity supply.
Start2012-07-25 09:00
End2012-07-25 09:00
Added2012-07-25 10:15
AuthorDAH

[Data]
Number801 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.
Start2012-07-27 17:00
End2012-07-30 19:00
Added2012-07-31 12:16
AuthorDAH

[Data]
Number798 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.
Start2012-07-29 05:50
End2012-07-29 11:34
Added2012-07-30 10:15
AuthorDAH

[Data]
Number799 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.
Start2012-07-30 07:58
End2012-07-30 09:02
Added2012-07-30 10:26
AuthorDAH

[Data]
Number800 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.
Start2012-07-30 14:48
End2012-07-31 08:48
Added2012-07-31 12:12
AuthorDAH

[Data]
Number1885 Instrument: MST Radar. The v4 wind data show some mild contamination from interference at altitudes above 17 km.
Start2012-08-02 16:50
End2017-08-02 18:00
Added2017-09-20 16:33
AuthorDAH

[Data]
Number803 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.
Start2012-08-04 05:56
End2012-08-05 18:08
Added2012-08-07 10:12
AuthorDAH

[Data]
Number802 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.
Start2012-08-06 09:43
End2012-08-06 10:51
Added2012-08-06 13:56
AuthorDAH

[Data]
Number804 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.
Start2012-08-07 08:50
End2012-08-07 08:53
Added2012-08-07 10:14
AuthorDAH

[Data]
Number805 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.
Start2012-08-09 23:18
End2012-08-10 08:51
Added2012-08-10 10:29
AuthorDAH

[Data]
Number806 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.
Start2012-08-10 17:09
End2012-08-13 08:29
Added2012-08-13 09:34
AuthorDAH

[Data]
Number807 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.
Start2012-08-13 11:43
End2012-08-13 16:05
Added2012-08-14 10:15
AuthorDAH

[Data]
Number808 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.
Start2012-08-16 09:28
End2012-08-16 11:28
Added2012-08-17 08:05
AuthorDAH

[Data]
Number809 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.
Start2012-08-17 11:09
End2012-08-17 11:18
Added2012-08-17 14:18
AuthorDAH

[Data]
Number810 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.
Start2012-08-18 00:00
End2012-08-21 13:10
Added2012-08-22 08:26
AuthorDAH

[Data]
Number811 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.
Start2012-08-18 20:56
End2012-08-21 10:21
Added2012-08-22 08:39
AuthorDAH

[Data]
Number812 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.
Start2012-08-20 23:26
End2012-08-21 08:46
Added2012-08-22 08:59
AuthorDAH

[Data]
Number813 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.
Start2012-08-22 09:37
End2012-08-22 15:51
Added2012-08-23 11:21
AuthorDAH

[Data]
Number814 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.
Start2012-08-22 20:17
End2012-08-23 10:13
Added2012-08-23 11:23
AuthorDAH

[Data]
Number815 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.
Start2012-08-23 12:58
End2012-08-23 13:46
Added2012-08-23 15:01
AuthorDAH

[Data]
Number816 Instrumet: Tipping Bucket Raingauge. LD cleaned out the instrument, which had become blocked with seeds.
Start2012-08-23 16:00
End2012-08-23 16:15
Added2012-08-24 08:38
AuthorDAH

[Data]
Number820 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.
Start2012-08-23 21:44
End2012-08-28 09:25
Added2012-08-28 11:49
AuthorDAH

[Data]
Number817 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.
Start2012-08-23 23:23
End2012-08-24 08:34
Added2012-08-24 09:39
AuthorDAH

[Data]
Number819 INstrument: UPS units. The units indicated a brief (~ 1 s) irregularity of the mains electricity supply.
Start2012-08-25 07:57
End2012-08-25 07:57
Added2012-08-28 08:48
AuthorDAH

[Data]
Number818 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.
Start2012-08-25 10:31
End2012-08-25 14:52
Added2012-08-28 08:36
AuthorDAH

[Data]
Number823 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.
Start2012-08-31 17:00
End2012-08-31 19:40
Added2012-09-05 08:49
AuthorDAH

[Data]
Number821 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.
Start2012-09-01 17:47
End2012-09-01 18:51
Added2012-09-04 08:07
AuthorDAH

[Data]
Number824 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.
Start2012-09-01 22:00
End2012-09-04 10:00
Added2012-09-05 09:03
AuthorDAH

[Data]
Number822 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.
Start2012-09-05 00:10
End2012-09-05 07:24
Added2012-09-05 08:30
AuthorDAH

[Data]
Number825 Instrument: MST Radar. The transmitter powering antenna sector A shut down with error code 4. DAH restarted the transmitter remotely.
Start2012-09-05 12:57
End2012-09-05 13:20
Added2012-09-05 14:37
AuthorDAH

[Data]
Number827 Instrument: UPS units. All units indicated a relatively long, i.e. 13 s, input power problem.
Start2012-09-08 15:48
End2012-09-08 15:48
Added2012-09-10 08:22
AuthorDAH

[Data]
Number826 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.
Start2012-09-09 06:28
End2012-09-09 08:40
Added2012-09-10 08:07
AuthorDAH

[Data]
Number831 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.
Start2012-09-10 00:00
End2012-09-11 17:47
Added2012-09-13 09:50
AuthorDAH

[Data]
Number828 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.
Start2012-09-10 16:07
End2012-09-10 16:55
Added2012-09-13 08:45
AuthorDAH

[Data]
Number867 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".
Start2012-09-10 16:07
End2013-02-04 08:28
Added2013-03-04 10:14
AuthorDAH

[Data]
Number830 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.
Start2012-09-11 01:34
End2012-09-11 13:51
Added2012-09-13 09:29
AuthorDAH

[Data]
Number829 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.
Start2012-09-11 08:30
End2012-09-11 17:48
Added2012-09-13 09:27
AuthorDAH

[Data]
Number832 Instrument: UPS units. The units indicated a brief, i.e. ~ 1 s, input power problem.
Start2012-09-12 17:27
End2012-09-12 17:27
Added2012-09-13 09:54
AuthorDAH

[Data]
Number833 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.
Start2012-09-13 17:13
End2012-09-13 18:58
Added2012-09-14 08:52
AuthorDAH

[Data]
Number834 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.
Start2012-09-13 21:41
End2012-09-14 10:49
Added2012-09-14 14:25
AuthorDAH

[Data]
Number1882 Instrument: MST Radar. The v4 data show unrealistically-large wind speeds within a narrow time/altitude region at around 9.5 km.
Start2012-09-16 06:30
End2012-09-16 07:15
Added2017-09-20 15:33
AuthorDAH

[Data]
Number1883 Instrument: MST Radar. The v4 data show unrealistically-large wind speeds within a narrow time/altitude region at around 12.5 km.
Start2012-09-23 15:30
End2012-09-23 16:15
Added2017-09-20 16:15
AuthorDAH

[Data]
Number1884 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.
Start2012-09-24 05:00
End2012-09-24 08:00
Added2017-09-20 16:22
AuthorDAH

[Data]
Number837 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.
Start2012-10-06 02:25
End2012-10-09 15:19
Added2012-10-17 08:49
AuthorDAH

[Data]
Number835 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.
Start2012-10-06 13:00
End2012-10-08 08:30
Added2012-10-09 11:15
AuthorDAH

[Data]
Number836 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.
Start2012-10-07 11:30
End2012-10-08 05:00
Added2012-10-09 11:23
AuthorDAH

[Data]
Number838 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.
Start2012-10-08 10:26
End2012-10-08 15:17
Added2012-10-17 08:53
AuthorDAH

[Data]
Number839 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.
Start2012-10-16 02:03
End2012-10-16 15:00
Added2012-10-17 09:04
AuthorDAH

[Data]
Number840 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.
Start2012-10-16 08:12
End2012-10-16 15:00
Added2012-10-17 14:10
AuthorDAH

[Data]
Number841 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.
Start2012-10-18 13:55
End2012-10-18 15:52
Added2012-10-23 09:15
AuthorDAH

[Data]
Number842 Instrument: LD40 Laser Ceilometer. There are some short gaps in the data during this period as a result of the acquisition PC being rebooted.
Start2012-10-18 14:50
End2012-10-18 15:30
Added2012-10-23 10:24
AuthorDAH

[Data]
Number843 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.
Start2012-10-23 09:58
End2012-10-23 11:52
Added2012-10-24 08:28
AuthorDAH

[Data]
Number844 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.
Start2012-10-24 18:44
End2012-10-25 10:35
Added2012-10-30 11:27
AuthorDAH

[Data]
Number846 Instrument: MST Radar. The transmitter powering antenna sector B blew its fuse. LD restarted it during a scheduled visit.
Start2012-10-26 01:49
End2012-10-26 12:01
Added2012-10-30 11:41
AuthorDAH

[Data]
Number845 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.
Start2012-10-28 11:53
End2012-10-29 16:59
Added2012-10-30 11:29
AuthorDAH

[Data]
Number1881 Instrument: MST Radar. The v4 data show unrealistically-large wind speeds within a narrow time/altitude region at around 9 km.
Start2012-10-29 20:30
End2012-10-29 21:20
Added2017-09-20 15:05
AuthorDAH

[Data]
Number848 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.
Start2012-11-01 05:24
End2012-11-01 14:17
Added2012-11-02 14:47
AuthorDAH

[Data]
Number847 Instrument: UPS Units. The units switched to battery power for approximately 1 s in response to an input power problem.
Start2012-11-01 07:24
End2012-11-01 07:24
Added2012-11-01 08:08
AuthorDAH

[Data]
Number849 Instrument: UPS units. Three of the units indicated a brief (~ 1 s) input power problem.
Start2012-11-04 05:38
End2012-11-04 05:38
Added2012-11-05 09:24
AuthorDAH

[Data]
Number1879 Instrument: MST Radar. The v4 data show unrealistically-large wind speeds within a narrow time/altitude region at around 11 km.
Start2012-11-05 19:40
End2012-11-05 20:30
Added2017-09-20 14:40
AuthorDAH

[Data]
Number850 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.
Start2012-11-06 13:52
End2012-11-06 16:01
Added2012-11-06 16:33
AuthorDAH

[Data]
Number1880 Instrument: MST Radar. The v4 data show unrealistically-large wind speeds within a narrow time/altitude region at around 9.5 km.
Start2012-11-10 08:30
End2012-11-10 09:15
Added2017-09-20 14:44
AuthorDAH

[Data]
Number851 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.
Start2012-11-20 11:18
End2012-11-20 11:37
Added2012-11-20 11:55
AuthorDAH

[Data]
Number1876 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.
Start2012-12-02 07:00
End2012-12-02 16:30
Added2017-09-20 14:04
AuthorDAH

[Data]
Number1877 Instrument: MST Radar. The v4 data show unrealistically-large wind speeds within a narrow time/altitude region at around 19 km.
Start2012-12-08 17:45
End2012-12-08 18:45
Added2017-09-20 14:13
AuthorDAH

[Data]
Number1878 Instrument: MST Radar. The v4 data show a vertically-narrow region of unrealistically-large wind speeds at around 9.5 km.
Start2012-12-14 04:50
End2012-12-14 05:40
Added2017-09-20 14:25
AuthorDAH

[Data]
Number852 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.
Start2012-12-16 17:52
End2012-12-17 09:41
Added2013-01-03 09:33
AuthorDAH

[Data]
Number853 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.
Start2013-01-02 07:10
End2013-01-02 13:00
Added2013-01-03 09:38
AuthorDAH

[Data]
Number854 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.
Start2013-01-09 00:51
End2013-01-09 09:23
Added2013-01-10 15:22
AuthorDAH

[Data]
Number856 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.
Start2013-01-19 05:50
End2013-01-19 13:10
Added2013-01-21 09:04
AuthorDAH

[Data]
Number857 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.
Start2013-01-20 02:47
End2013-01-21 15:55
Added2013-01-22 14:15
AuthorDAH

[Data]
Number855 Instrument: UPS units. All units indicated a brief (~ 1 s) input power problem.
Start2013-01-20 19:26
End2013-01-20 19:26
Added2013-01-21 08:44
AuthorDAH

[Data]
Number858 Instrument: UPS units. The units indicated 3 brief (~ 1 s) input power problems during this 1 minute period.
Start2013-01-23 13:30
End2013-01-23 13:31
Added2013-01-23 13:54
AuthorDAH

[Data]
Number861 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.
Start2013-01-26 10:00
End2013-01-26 20:03
Added2013-01-29 14:17
AuthorDAH

[Data]
Number859 Instrument: UPS units. The units indicted a relatively long (~ 13 s) input power problem.
Start2013-01-26 20:59
End2013-01-26 20:59
Added2013-01-28 08:44
AuthorDAH

[Data]
Number860 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.
Start2013-01-27 06:20
End2013-01-27 15:50
Added2013-01-28 10:23
AuthorDAH

[Data]
Number862 Instrument: UPS units. Two of the units indicated a brief (~ 1 s) input power problem.
Start2013-01-31 06:58
End2013-01-31 06:58
Added2013-02-01 08:59
AuthorDAH

[Data]
Number863 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.
Start2013-02-15 00:30
End2013-02-15 23:20
Added2013-02-18 08:48
AuthorDAH

[Data]
Number864 Instrument: MST Radar. The radar suffered from a 30 minute period of internal interference. The corresponding wind-profile data were flagged as being unreliable.
Start2013-02-17 06:55
End2013-02-17 07:30
Added2013-02-18 08:55
AuthorDAH

[Data]
Number866 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.
Start2013-02-17 23:36
End2013-02-22 10:56
Added2013-03-04 09:51
AuthorDAH

[Data]
Number865 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.
Start2013-03-03 04:30
End2013-03-03 09:30
Added2013-03-04 09:39
AuthorDAH

[Data]
Number868 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.
Start2013-03-08 09:10
End2013-03-08 17:15
Added2013-03-11 08:22
AuthorDAH

[Data]
Number871 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.
Start2013-03-15 14:31
End2013-03-15 16:04
Added2013-04-10 11:39
AuthorDAH

[Data]
Number869 Instrument: MST Radar. The radar experienced 7 brief episodes (< 15 minutes long) of interference during this period. This resulted in reductions in altitude cover.
Start2013-03-28 02:00
End2013-03-28 05:50
Added2013-04-02 08:56
AuthorDAH

[Data]
Number870 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.
Start2013-03-30 05:00
End2013-03-30 08:10
Added2013-04-02 09:38
AuthorDAH

[Data]
Number872 Instrument: MST Radar. The radar suffered from a period of interference. This led to a reduction in altitude cover for the wind-profile data.
Start2013-04-13 15:00
End2013-04-13 17:30
Added2013-04-15 10:01
AuthorDAH

[Data]
Number873 Instrument: MST Radar. The radar suffered two brief (~ minutes) episodes of interference.
Start2013-04-16 02:55
End2013-04-16 03:30
Added2013-04-17 08:01
AuthorDAH

[Data]
Number874 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.
Start2013-05-04 18:17
End2013-05-07 08:49
Added2013-05-07 10:45
AuthorDAH

[Data]
Number875 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.
Start2013-05-05 03:06
End2013-05-05 19:12
Added2013-05-07 10:54
AuthorDAH

[Data]
Number878 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.
Start2013-05-07 14:57
End2013-05-08 09:00
Added2013-05-13 16:29
AuthorDAH

[Data]
Number877 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.
Start2013-05-08 08:58
End2013-05-08 08:59
Added2013-05-13 16:26
AuthorDAH

[Data]
Number876 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.
Start2013-05-12 04:51
End2013-05-12 15:00
Added2013-05-13 16:21
AuthorDAH

[Data]
Number880 Instrument: MST Radar. The transmitter powering antenna sector C blew its fuse and was out of action for approximately 48 hours.
Start2013-05-18 03:05
End2013-05-20 08:59
Added2013-05-20 16:35
AuthorDAH

[Data]
Number879 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.
Start2013-05-18 12:00
End2013-05-18 12:50
Added2013-05-20 08:06
AuthorDAH

[Data]
Number881 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.
Start2013-05-20 14:06
End2013-05-20 15:22
Added2013-05-20 16:39
AuthorDAH

[Data]
Number882 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.
Start2013-05-22 13:59
End2013-05-22 14:56
Added2013-05-22 16:17
AuthorDAH

[Data]
Number883 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.
Start2013-05-23 22:12
End2013-05-24 07:05
Added2013-05-24 08:50
AuthorDAH

[Data]
Number884 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.
Start2013-05-25 17:39
End2013-05-28 09:48
Added2013-05-28 10:26
AuthorDAH

[Data]
Number886 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.
Start2013-05-26 00:00
End2013-05-26 23:59
Added2013-05-28 15:35
AuthorDAH

[Data]
Number885 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.
Start2013-05-26 11:11
End2013-05-26 12:22
Added2013-05-28 10:28
AuthorDAH

[Data]
Number1874 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.
Start2013-05-30 10:30
End2013-05-30 16:30
Added2017-09-19 15:37
AuthorDAH

[Data]
Number887 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).
Start2013-05-31 22:50
End2013-06-01 10:50
Added2013-06-01 12:03
AuthorDAH

[Data]
Number888 Instrument: UPS units. The UPS units indicated a brief (~ 1 s) input power problem.
Start2013-06-01 21:59
End2013-06-01 21:59
Added2013-06-03 09:55
AuthorDAH

[Data]
Number889 Instrument: MST Radar. The transmitter powering antenna sector B shut down. LD restarted it when he was on site the following day.
Start2013-06-03 16:26
End2013-06-04 09:43
Added2013-06-17 16:23
AuthorDAH

[Data]
Number890 Instrumeht: MST Radar. The transmitter powering antenna sector B shut down.. LD restarted it the folllowing day.
Start2013-06-04 17:13
End2013-06-05 14:14
Added2013-06-17 16:24
AuthorDAH

[Data]
Number891 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.
Start2013-06-05 17:03
End2013-06-06 16:19
Added2013-06-17 16:27
AuthorDAH

[Data]
Number892 Instrument: UPS Units. Two of the units indicated a brief (~ 1 s) input power problem.
Start2013-06-16 06:38
End2013-06-16 06:38
Added2013-06-17 16:30
AuthorDAH

[Data]
Number1873 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.
Start2013-06-16 15:10
End2013-06-16 16:50
Added2017-09-19 12:17
AuthorDAH

[Data]
Number893 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.
Start2013-06-19 14:00
End2013-06-19 15:30
Added2013-06-20 08:25
AuthorDAH

[Data]
Number898 Instrument: MST Radar. LD raised the power setting on the transmitter powering antenna sector E from level 3 to 4, out of 5.
Start2013-06-28 10:10
End2013-06-28 10:27
Added2013-07-12 11:33
AuthorDAH

[Data]
Number894 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.
Start2013-06-30 07:32
End2013-07-01 09:38
Added2013-07-01 15:06
AuthorDAH

[Data]
Number899 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.
Start2013-07-02 10:14
End2013-07-12 11:48
Added2013-07-12 15:25
AuthorDAH

[Data]
Number895 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.
Start2013-07-04 20:20
End2013-07-05 08:11
Added2013-07-05 09:51
AuthorDAH

[Data]
Number900 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.
Start2013-07-09 09:21
End2013-07-09 10:14
Added2013-07-12 16:27
AuthorDAH

[Data]
Number896 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.
Start2013-07-09 17:31
End2013-07-10 08:58
Added2013-07-10 10:29
AuthorDAH

[Data]
Number901 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.
Start2013-07-09 17:31
End2013-07-12 16:27
Added2013-07-12 16:36
AuthorDAH

[Data]
Number897 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.
Start2013-07-11 13:00
End2013-07-11 13:50
Added2013-07-12 10:27
AuthorDAH

[Data]
Number902 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.
Start2013-07-14 21:51
End2013-07-15 08:00
Added2013-07-15 10:01
AuthorDAH

[Data]
Number903 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.
Start2013-07-18 19:14
End2013-07-19 08:50
Added2013-07-19 14:36
AuthorDAH

[Data]
Number904 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.
Start2013-07-19 16:36
End2013-07-22 08:17
Added2013-07-22 09:34
AuthorDAH

[Data]
Number905 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.
Start2013-07-27 11:46
End2013-07-30 15:59
Added2013-07-30 16:40
AuthorDAH

[Data]
Number907 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.
Start2013-07-30 13:59
End2013-07-30 14:22
Added2013-07-31 10:06
AuthorDAH

[Data]
Number906 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.
Start2013-07-31 03:47
End2013-07-31 03:47
Added2013-07-31 09:38
AuthorDAH

[Data]
Number908 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.
Start2013-08-01 00:14
End2013-08-02 08:45
Added2013-08-08 08:47
AuthorDAH

[Data]
Number909 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.
Start2013-08-02 11:25
End2013-08-06 14:39
Added2013-08-08 09:28
AuthorDAH

[Data]
Number910 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.
Start2013-08-13 04:04
End2013-08-13 10:05
Added2013-08-14 09:25
AuthorDAH

[Data]
Number913 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.
Start2013-08-20 00:00
End2013-08-20 23:59
Added2013-08-29 08:51
AuthorDAH

[Data]
Number914 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.
Start2013-08-23 00:00
End2013-08-23 23:59
Added2013-08-29 08:51
AuthorDAH

[Data]
Number911 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.
Start2013-08-26 11:50
End2013-08-26 14:30
Added2013-08-28 09:46
AuthorDAH

[Data]
Number915 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.
Start2013-08-26 17:29
End2013-09-03 08:42
Added2013-09-03 10:13
AuthorDAH

[Data]
Number916 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.
Start2013-08-28 04:57
End2013-08-28 04:58
Added2013-09-03 10:19
AuthorDAH

[Data]
Number912 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.
Start2013-08-28 14:45
End2013-08-28 15:45
Added2013-08-29 08:35
AuthorDAH

[Data]
Number921 Instrument: MST Radar. The transmitter powering antenna sector B was out of action with a blown fuse.
Start2013-09-03 19:37
End2013-09-04 14:02
Added2013-09-20 10:10
AuthorDAH

[Data]
Number917 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.
Start2013-09-03 19:45
End2013-09-04 01:00
Added2013-09-05 08:46
AuthorDAH

[Data]
Number922 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.
Start2013-09-06 00:00
End2013-09-13 09:00
Added2013-09-20 10:35
AuthorDAH

[Data]
Number919 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.
Start2013-09-19 00:00
End2013-09-19 23:59
Added2013-09-20 09:32
AuthorDAH

[Data]
Number920 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.
Start2013-09-19 10:16
End2013-09-20 08:33
Added2013-09-20 10:06
AuthorDAH

[Data]
Number918 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.
Start2013-09-19 22:51
End2013-09-20 07:05
Added2013-09-20 08:32
AuthorDAH

[Data]
Number925 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.
Start2013-09-23 14:49
End2013-09-25 15:26
Added2013-09-30 12:21
AuthorDAH

[Data]
Number928 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.
Start2013-09-27 06:13
End2013-09-27 06:13
Added2013-10-07 15:12
AuthorDAH

[Data]
Number924 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.
Start2013-09-28 00:00
End2013-09-29 23:59
Added2013-09-30 11:53
AuthorDAH

[Data]
Number923 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.
Start2013-09-28 05:59
End2013-09-28 06:21
Added2013-09-30 08:36
AuthorDAH

[Data]
Number926 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.
Start2013-09-28 06:20
End2013-09-28 06:20
Added2013-10-07 14:21
AuthorDAH

[Data]
Number927 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.
Start2013-10-03 00:00
End2013-10-04 23:59
Added2013-10-07 15:06
AuthorDAH

[Data]
Number929 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.
Start2013-10-08 01:20
End2013-10-08 07:10
Added2013-10-10 09:38
AuthorDAH

[Data]
Number932 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.
Start2013-10-12 14:15
End2013-10-12 14:31
Added2013-10-14 12:16
AuthorDAH

[Data]
Number930 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.
Start2013-10-13 00:51
End2013-10-13 11:00
Added2013-10-14 08:28
AuthorDAH

[Data]
Number931 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.
Start2013-10-13 11:51
End2013-10-13 13:00
Added2013-10-14 08:37
AuthorDAH

[Data]
Number933 Instrument: MST Radar. Beam steering unit number 94 updated its software at this time. The reason for it doing this is unknown.
Start2013-10-13 19:42
End2013-10-13 19:42
Added2013-10-14 16:36
AuthorDAH

[Data]
Number934 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.
Start2013-10-16 12:53
End2013-10-16 16:50
Added2013-10-18 14:46
AuthorDAH

[Data]
Number935 Instrument: MST Radar. The transmitter powering antenna sector B blew its fuse. LD was on site later the same morning and fixed it.
Start2013-10-18 06:36
End2013-10-18 09:27
Added2013-10-18 14:48
AuthorDAH

[Data]
Number936 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.
Start2013-10-22 10:22
End2013-10-22 14:36
Added2013-10-23 09:19
AuthorDAH

[Data]
Number937 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.
Start2013-10-23 09:10
End2013-10-23 09:22
Added2013-10-23 11:50
AuthorDAH

[Data]
Number939 Instrument: MST Radar. The transmitter powering antenna sector B was out of action with a blown choke.
Start2013-10-25 15:59
End2013-10-29 10:34
Added2013-11-04 10:10
AuthorDAH

[Data]
Number940 Instrument: MST Radar. The transmitter powering antenna sector B was out of action with a blown choke.
Start2013-10-29 23:18
End2013-11-01 12:35
Added2013-11-04 10:11
AuthorDAH

[Data]
Number938 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.
Start2013-11-02 13:14
End2013-11-02 13:23
Added2013-11-04 09:04
AuthorDAH

[Data]
Number941 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.
Start2013-11-04 22:34
End2013-11-04 22:34
Added2013-11-05 09:52
AuthorDAH

[Data]
Number942 Instrument: MST Radar. The radar was powered down whilst Aberystwyth University students carried out a surveying practical on the antenna array.
Start2013-11-05 09:47
End2013-11-05 11:47
Added2013-11-05 13:50
AuthorDAH

[Data]
Number943 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.
Start2013-11-05 11:31
End2013-11-05 11:42
Added2013-11-07 08:50
AuthorDAH

[Data]
Number944 Instrument: MST Radar. The radar suffered from interference, which led to a reduction in the useful altitude coverage.
Start2013-11-11 08:50
End2013-11-11 10:40
Added2013-11-11 16:20
AuthorDAH

[Data]
Number946 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.
Start2013-11-12 03:30
End2013-11-15 16:30
Added2013-11-22 09:23
AuthorDAH

[Data]
Number945 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.
Start2013-11-13 02:44
End2013-11-13 07:14
Added2013-11-15 12:24
AuthorDAH

[Data]
Number947 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.
Start2013-11-18 02:49
End2013-11-18 03:04
Added2013-11-22 09:25
AuthorDAH

[Data]
Number948 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.
Start2013-11-29 00:00
End2013-11-29 23:59
Added2013-12-02 09:05
AuthorDAH

[Data]
Number949 Instrument: MST Radar. The radar was stopped to allow a dipole to be changed on one of the Yagis.
Start2013-12-04 15:30
End2013-12-04 16:21
Added2013-12-09 09:02
AuthorDAH

[Data]
Number951 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.
Start2013-12-05 00:00
End2013-12-05 23:59
Added2013-12-09 10:19
AuthorDAH

[Data]
Number961 Instrument: MST Radar. The transmitter for antenna sector E was powered down so that one of the Yagi dipoles could be swapped.
Start2013-12-05 11:24
End2013-12-05 11:57
Added2014-01-09 09:25
AuthorDAH

[Data]
Number962 Instrument: MST Radar. The transmitter for antenna sector E was powered down so that one of the Yagi dipoles could be swapped.
Start2013-12-05 12:48
End2013-12-05 13:07
Added2014-01-09 09:26
AuthorDAH

[Data]
Number950 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.
Start2013-12-07 00:00
End2013-12-08 23:59
Added2013-12-09 10:19
AuthorDAH

[Data]
Number963 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.
Start2013-12-10 09:54
End2013-12-10 14:24
Added2014-01-09 11:18
AuthorDAH

[Data]
Number952 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.
Start2013-12-13 00:00
End2013-12-13 23:59
Added2013-12-16 10:36
AuthorDAH

[Data]
Number953 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.
Start2013-12-13 00:00
End2013-12-13 23:59
Added2013-12-17 08:33
AuthorDAH

[Data]
Number954 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.
Start2013-12-16 00:00
End2013-12-16 23:59
Added2013-12-17 08:38
AuthorDAH

[Data]
Number964 Instrument: UPS Units. The units switched to battery power in response to a brief (~ 1s) input power problem.
Start2013-12-22 12:36
End2013-12-22 12:36
Added2014-01-09 11:27
AuthorDAH

[Data]
Number967 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.
Start2013-12-25 12:38
End2013-12-28 15:37
Added2014-01-13 14:50
AuthorDAH

[Data]
Number965 Instrument: UPS Units. The units switched to battery power in response to a brief (~ 1s) input power problem.
Start2013-12-26 21:02
End2013-12-26 21:02
Added2014-01-09 11:32
AuthorDAH

[Data]
Number960 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.
Start2013-12-28 04:31
End2014-01-03 12:00
Added2014-01-07 16:39
AuthorDAH

[Data]
Number956 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.
Start2013-12-30 14:15
End2013-12-30 15:21
Added2014-01-07 11:42
AuthorDAH

[Data]
Number957 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.
Start2013-12-30 14:35
End2014-01-06 10:30
Added2014-01-07 12:23
AuthorDAH

[Data]
Number955 Instrument: UPS units. The units switched to battery power for ~1 s i response to an input power problem.
Start2014-01-03 19:32
End2014-01-03 19:32
Added2014-01-06 11:46
AuthorDAH

[Data]
Number966 Instrument: MST Radar. The beam steering controller indicated that the forward power was low of antenna sectors A, B, and C for one dwell.
Start2014-01-05 05:21
End2014-01-05 05:21
Added2014-01-09 14:53
AuthorDAH

[Data]
Number958 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.
Start2014-01-07 14:29
End2014-01-07 14:42
Added2014-01-07 15:05
AuthorDAH

[Data]
Number959 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.
Start2014-01-07 15:21
End2014-01-07 16:17
Added2014-01-07 16:20
AuthorDAH

[Data]
Number968 Instrument: MST Radar. The beam steering controller indicated that units 41, 42, 51, and 52 were not responding during this period.
Start2014-01-09 14:25
End2014-01-09 14:36
Added2014-01-13 15:02
AuthorDAH

[Data]
Number969 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.
Start2014-01-12 18:05
End2014-01-12 22:53
Added2014-01-13 15:07
AuthorDAH

[Data]
Number970 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.
Start2014-01-13 00:00
End2014-01-14 23:59
Added2014-01-14 08:43
AuthorDAH

[Data]
Number971 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.
Start2014-01-16 00:00
End2014-01-16 23:59
Added2014-01-17 08:43
AuthorDAH

[Data]
Number972 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.
Start2014-01-17 00:00
End2014-01-19 23:59
Added2014-01-20 08:53
AuthorDAH

[Data]
Number973 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.
Start2014-01-17 10:27
End2014-01-17 10:31
Added2014-01-20 14:18
AuthorDAH

[Data]
Number976 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.
Start2014-01-21 00:00
End2014-01-22 23:59
Added2014-01-23 08:42
AuthorDAH

[Data]
Number974 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.
Start2014-01-21 03:18
End2014-01-21 03:34
Added2014-01-21 09:47
AuthorDAH

[Data]
Number975 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.
Start2014-01-21 10:06
End2014-01-21 10:23
Added2014-01-21 16:08
AuthorDAH

[Data]
Number980 Instrument: Vaisala WXT510. A known bug in the netCDF file creation software prevented the file being created owing to gaps in the raw data.
Start2014-01-24 00:00
End2014-01-24 23:59
Added2014-01-28 13:52
AuthorDAH

[Data]
Number977 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.
Start2014-01-24 14:09
End2014-01-24 14:47
Added2014-01-24 16:29
AuthorDAH

[Data]
Number978 Instrument: UPS units. The units switched to battery power for a relatively long time (~ 18 s) in repsonse to an input power problem.
Start2014-01-24 16:39
End2014-01-24 16:39
Added2014-01-28 11:35
AuthorDAH

[Data]
Number979 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.
Start2014-01-25 13:41
End2014-01-26 11:40
Added2014-01-28 12:04
AuthorDAH

[Data]
Number981 Instrument: UPS units. The UPS units switched to battery power in response to a brief (~ 1 s) input power problem.
Start2014-01-29 11:26
End2014-01-29 11:26
Added2014-01-30 09:14
AuthorDAH

[Data]
Number982 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.
Start2014-01-29 11:50
End2014-01-29 11:50
Added2014-01-30 10:32
AuthorDAH

[Data]
Number983 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.
Start2014-01-29 14:15
End2014-01-29 14:21
Added2014-01-30 11:09
AuthorDAH

[Data]
Number987 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.
Start2014-02-05 13:21
End2014-02-05 13:21
Added2014-02-10 15:30
AuthorDAH

[Data]
Number984 Instrument: UPS units. The units switched tp battery power owing to a brief (~ 1 s) input power problem.
Start2014-02-06 02:11
End2014-02-06 02:11
Added2014-02-06 10:23
AuthorDAH

[Data]
Number985 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.
Start2014-02-07 09:20
End2014-02-07 10:30
Added2014-02-10 08:34
AuthorDAH

[Data]
Number986 Instrument: UPS units. The UPS units switched to battery power in response to a brief (~ 1 s) input power problem.
Start2014-02-07 11:08
End2014-02-07 11:08
Added2014-02-10 15:24
AuthorDAH

[Data]
Number990 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.
Start2014-02-07 12:16
End2014-02-07 13:00
Added2014-02-10 15:33
AuthorDAH

[Data]
Number991 Instrument: MST Radar. The transmitter powering antenna section B was out of action during this period owing to a blown fuse.
Start2014-02-10 06:58
End2014-02-11 10:30
Added2014-02-13 08:20
AuthorDAH

[Data]
Number988 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.
Start2014-02-10 10:21
End2014-02-10 10:21
Added2014-02-10 15:30
AuthorDAH

[Data]
Number989 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.
Start2014-02-10 14:21
End2014-02-10 14:21
Added2014-02-10 15:31
AuthorZKO

[Data]
Number992 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.
Start2014-02-11 11:57
End2014-02-11 12:49
Added2014-02-13 08:51
AuthorDAH

[Data]
Number993 Instrument: MST Radar. The beam steering controller gave a critical system error message, although the radar continued to operate without a problem.
Start2014-02-11 16:49
End2014-02-11 16:49
Added2014-02-13 09:15
AuthorDAH

[Data]
Number1010 Instrument: MST Radar. The transmitter powering antenna sector A was out of action with a blown fuse.
Start2014-02-11 18:34
End2014-02-12 13:48
Added2014-02-26 09:59
AuthorDAH

[Data]
Number994 Instrument: MST Radar. The beam steering controller gave a critical system error message, although the radar continued to operate without a problem.
Start2014-02-12 11:32
End2014-02-12 11:32
Added2014-02-13 09:16
AuthorDAH

[Data]
Number995 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.
Start2014-02-12 13:45
End2014-02-12 17:05
Added2014-02-13 09:50
AuthorZKO

[Data]
Number996 Instrument: UPS units. The units switched to battery power for ~ 6 s in response to an input power problem.
Start2014-02-13 04:48
End2014-02-13 04:48
Added2014-02-13 10:08
AuthorDAH

[Data]
Number997 Instrument: UPS units. The units switched to battery power in response to a brief (~1 s) input power problem.
Start2014-02-13 20:23
End2014-02-13 20:23
Added2014-02-14 08:26
AuthorDAH

[Data]
Number998 Instrument: UPS units. The units switched to battery power in response to a brief (~2 s) input power problem.
Start2014-02-14 02:45
End2014-02-14 02:45
Added2014-02-14 08:28
AuthorDAH

[Data]
Number999 Instrument: UPS units. The units switched to battery power in response to a brief (~1 s) input power problem.
Start2014-02-14 03:06
End2014-02-14 03:06
Added2014-02-14 08:32
AuthorDAH

[Data]
Number1000 Instrument: UPS units. The units switched to battery power in response to a brief (~1 s) input power problem.
Start2014-02-14 03:20
End2014-02-14 03:20
Added2014-02-14 08:33
AuthorDAH

[Data]
Number1001 Instrument: UPS units. The units switched to battery power in response to a brief (~2 s) input power problem.
Start2014-02-14 05:09
End2014-02-14 05:09
Added2014-02-14 08:35
AuthorZKO

[Data]
Number1003 Instrument: MST Radar. The noise power was raised during this period owing to LD carry out investigations on the transmitter powering antenna sector E.
Start2014-02-14 09:20
End2014-02-14 11:00
Added2014-02-17 08:30
AuthorDAH

[Data]
Number1020 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.
Start2014-02-14 18:00
End2014-02-21 17:20
Added2014-02-26 14:47
AuthorDAH

[Data]
Number1004
Start2014-02-15 00:47
End2014-02-17 09:47
Added2014-02-17 09:48
AuthorDAH

[Data]
Number1002 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.
Start2014-02-15 19:29
End2014-02-15 19:29
Added2014-02-17 08:27
AuthorDAH

[Data]
Number1005 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.
Start2014-02-15 21:52
End2014-02-15 21:52
Added2014-02-17 10:25
AuthorDAH

[Data]
Number1006 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.
Start2014-02-15 23:26
End2014-02-15 23:27
Added2014-02-17 11:16
AuthorDAH

[Data]
Number1011 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.
Start2014-02-17 12:01
End2014-02-17 12:01
Added2014-02-26 10:03
AuthorDAH

[Data]
Number1007 Instrument: UPS units. The units switched to battery power in response to a relatively long (~ 10 s) input power problem.
Start2014-02-17 15:57
End2014-02-17 15:57
Added2014-02-18 09:14
AuthorDAH

[Data]
Number1008 Instrument: UPS units. The units switched to battery power for a relatively long time (~ 20 s) in response to an input power problem.
Start2014-02-17 16:24
End2014-02-17 16:24
Added2014-02-18 09:19
AuthorDAH

[Data]
Number1009 Instrument: UPS units. The units switched to battery power for a relatively long time (~ 12 s) in response to an input power problem.
Start2014-02-17 17:01
End2014-02-17 17:01
Added2014-02-18 09:54
AuthorDAH

[Data]
Number1012 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.
Start2014-02-18 16:49
End2014-02-18 16:49
Added2014-02-26 10:05
AuthorDAH

[Data]
Number1019 Instrument: MST Radar. The beam steering controller inidcated that the forward power from all 5 transmitters was briefly low.
Start2014-02-19 05:11
End2014-02-19 05:12
Added2014-02-26 10:19
AuthorDAH

[Data]
Number1013 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.
Start2014-02-19 12:40
End2014-02-19 12:43
Added2014-02-26 10:06
AuthorDAH

[Data]
Number1014 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.
Start2014-02-19 15:40
End2014-02-19 15:40
Added2014-02-26 10:08
AuthorDAH

[Data]
Number1015 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.
Start2014-02-20 14:50
End2014-02-20 14:50
Added2014-02-26 10:11
AuthorDAH

[Data]
Number1016 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.
Start2014-02-21 16:52
End2014-02-21 16:52
Added2014-02-26 10:14
AuthorDAH

[Data]
Number1017 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.
Start2014-02-22 22:38
End2014-02-22 22:38
Added2014-02-26 10:15
AuthorDAH

[Data]
Number1018 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.
Start2014-02-22 23:31
End2014-02-22 23:31
Added2014-02-26 10:16
AuthorDAH

[Data]
Number1042 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.
Start2014-02-27 01:12
End2014-03-14 10:05
Added2014-03-31 16:38
AuthorDAH

[Data]
Number1021 Instrument: MST Radar. The transmitter powering antenna sector E was out of action during this period owing to a blown HV fuse.
Start2014-02-28 00:34
End2014-02-28 12:37
Added2014-02-28 16:28
AuthorDAH

[Data]
Number1022 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.
Start2014-02-28 23:30
End2014-02-28 23:30
Added2014-03-05 14:03
AuthorDAH

[Data]
Number1038 Instrument: MST Radar. The beam steering controller indicated a dip in forward power. for antenna sector A, for 1 dwell.
Start2014-03-01 06:50
End2014-03-01 06:50
Added2014-03-28 09:42
AuthorDAH

[Data]
Number1039 Instrument: MST Radar. The beam steering controller indicated a dip in forward power. for antenna sectors A and D, for 1 dwell.
Start2014-03-01 18:45
End2014-03-01 18:45
Added2014-03-28 09:43
AuthorDAH

[Data]
Number1023 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.
Start2014-03-03 11:47
End2014-03-03 11:47
Added2014-03-05 14:03
AuthorDAH

[Data]
Number1024 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.
Start2014-03-03 12:49
End2014-03-03 12:49
Added2014-03-05 14:04
AuthorDAH

[Data]
Number1025 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.
Start2014-03-03 13:21
End2014-03-03 13:21
Added2014-03-05 14:05
AuthorDAH

[Data]
Number1026 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.
Start2014-03-03 16:26
End2014-03-03 16:26
Added2014-03-05 14:05
AuthorZKO

[Data]
Number1029 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.
Start2014-03-12 09:25
End2014-03-12 09:25
Added2014-03-28 09:29
AuthorDAH

[Data]
Number1046 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.
Start2014-03-14 14:27
End2014-03-25 11:19
Added2014-04-01 09:42
AuthorDAH

[Data]
Number1030 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.
Start2014-03-14 15:14
End2014-03-14 15:14
Added2014-03-28 09:30
AuthorDAH

[Data]
Number1031 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.
Start2014-03-14 16:11
End2014-03-24 16:11
Added2014-03-28 09:30
AuthorDAH

[Data]
Number1032 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.
Start2014-03-14 16:56
End2014-03-14 16:56
Added2014-03-28 09:31
AuthorDAH

[Data]
Number1033 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.
Start2014-03-14 17:02
End2014-03-14 17:02
Added2014-03-28 09:31
AuthorDAH

[Data]
Number1034 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.
Start2014-03-19 11:23
End2014-03-19 11:23
Added2014-03-28 09:32
AuthorDAH

[Data]
Number1035 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.
Start2014-03-25 14:50
End2014-03-25 14:50
Added2014-03-28 09:32
AuthorDAH

[Data]
Number1047 Instrument: MST Radar. The transmitter powering antenna sector B was down with an analogue error.
Start2014-03-25 19:52
End2014-03-27 11:56
Added2014-04-01 10:12
AuthorDAH

[Data]
Number1028 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.
Start2014-03-26 00:00
End2014-03-26 23:59
Added2014-03-28 09:20
AuthorDAH

[Data]
Number1036 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.
Start2014-03-26 10:04
End2014-03-26 10:04
Added2014-03-28 09:34
AuthorDAH

[Data]
Number1037 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.
Start2014-03-26 13:57
End2014-03-26 13:57
Added2014-03-28 09:35
AuthorDAH

[Data]
Number1027 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".
Start2014-03-26 14:50
End2014-03-26 18:45
Added2014-03-28 08:28
AuthorDAH

[Data]
Number1040 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.
Start2014-03-27 03:40
End2014-03-27 06:33
Added2014-03-28 09:53
AuthorDAH

[Data]
Number1048 Instrument: MST Radar. The transmitter powering antenna sector B was down with an analogue error.
Start2014-03-27 20:40
End2014-03-28 09:52
Added2014-04-01 10:14
AuthorDAH

[Data]
Number1041 Instrument: MST Radar. The beam steering controller indicated that unit 35 (antenna sector B) was not responding during this period.
Start2014-03-28 00:29
End2014-03-28 01:54
Added2014-03-28 09:55
AuthorDAH

[Data]
Number1043 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.
Start2014-03-29 19:28
End2014-03-31 07:24
Added2014-04-01 08:36
AuthorDAH

[Data]
Number1045 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.
Start2014-03-30 15:49
End2014-04-02 07:35
Added2014-04-01 08:41
AuthorDAH

[Data]
Number1044 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.
Start2014-03-31 19:17
End2014-04-01 07:07
Added2014-04-01 08:36
AuthorDAH

[Data]
Number1049 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.
Start2014-04-01 10:22
End2014-04-01 10:55
Added2014-04-01 16:28
AuthorDAH

[Data]
Number1050 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.
Start2014-04-01 11:51
End2014-04-01 13:00
Added2014-04-01 16:29
AuthorDAH

[Data]
Number1051 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.
Start2014-04-02 00:59
End2014-04-02 07:05
Added2014-04-02 08:20
AuthorDAH

[Data]
Number1052 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.
Start2014-04-02 16:41
End2014-04-03 07:00
Added2014-04-03 08:54
AuthorDAH

[Data]
Number1053 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.
Start2014-04-03 13:40
End2014-04-03 13:46
Added2014-04-03 14:49
AuthorDAH

[Data]
Number1054 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.
Start2014-04-03 15:00
End2014-04-03 15:07
Added2014-04-03 16:07
AuthorDAH

[Data]
Number1056 Instrument: UPS units. The units switched to battery power for a relatively long - 4 minutes - input power problem.
Start2014-04-03 17:54
End2014-04-03 17:58
Added2014-04-04 08:52
AuthorDAH

[Data]
Number1058 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.
Start2014-04-03 17:55
End2014-04-03 17:59
Added2014-04-04 09:55
AuthorDAH

[Data]
Number1057 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.
Start2014-04-03 18:36
End2014-04-03 18:47
Added2014-04-04 09:19
AuthorDAH

[Data]
Number1055 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.
Start2014-04-03 19:24
End2014-04-04 07:20
Added2014-04-04 08:27
AuthorDAH

[Data]
Number1060 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.
Start2014-04-04 09:15
End2014-04-09 11:14
Added2014-04-11 13:29
AuthorDAH

[Data]
Number1059 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.
Start2014-04-07 00:32
End2014-04-08 11:00
Added2014-04-08 12:17
AuthorDAH

[Data]
Number1061 Instrument: MST Radar. Beam steering unit 87 gave a brief (i.e. one dwell) indication of low supply voltage before readings returned to normal.
Start2014-04-10 09:33
End2014-04-10 09:33
Added2014-04-11 13:43
AuthorDAH

[Data]
Number1062 Instrument: MST Radar. The beam steering controller indicated that the transmitters for antenna sectors A, B, and C briefly had low forward power.
Start2014-04-11 07:24
End2014-04-11 07:24
Added2014-04-11 13:49
AuthorDAH

[Data]
Number1067 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.
Start2014-04-15 14:39
End2014-05-06 09:13
Added2014-05-12 15:32
AuthorDAH

[Data]
Number1063 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.
Start2014-04-20 19:00
End2014-04-20 19:00
Added2014-04-21 12:22
AuthorDAH

[Data]
Number1064 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.
Start2014-05-08 06:35
End2014-05-08 15:47
Added2014-05-09 09:04
AuthorDAH

[Data]
Number1065 Instrument: MST Radar. The radar was stopped briefly so that LD could change beam steering unit 37, which had been seeing high VSWR values.
Start2014-05-09 10:24
End2014-05-09 10:37
Added2014-05-09 12:08
AuthorDAH

[Data]
Number1066 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.
Start2014-05-10 00:00
End2014-05-10 23:59
Added2014-05-12 09:20
AuthorDAH

[Data]
Number1069 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.
Start2014-05-13 00:00
End2014-05-13 09:00
Added2014-05-14 08:43
AuthorDAH

[Data]
Number1068 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.
Start2014-05-13 09:37
End2014-05-13 10:27
Added2014-05-13 12:02
AuthorDAH

[Data]
Number1071 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.
Start2014-05-23 00:00
End2014-05-30 10:30
Added2014-06-04 13:53
AuthorDAH

[Data]
Number1070 Instrument: UPS units. The UPS units switched to battery power for ~ 1 s in response to an input power problem.
Start2014-05-23 07:05
End2014-05-23 07:05
Added2014-05-23 08:29
AuthorDAH

[Data]
Number1072 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.
Start2014-05-26 20:29
End2014-05-28 04:24
Added2014-06-04 15:10
AuthorDAH

[Data]
Number1073 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.
Start2014-05-26 20:29
End2014-05-28 04:24
Added2014-06-04 15:27
AuthorDAH

[Data]
Number1074 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.
Start2014-05-30 02:50
End2014-05-30 23:04
Added2014-06-04 15:27
AuthorDAH

[Data]
Number1075 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.
Start2014-06-01 17:22
End2014-06-01 19:02
Added2014-06-04 16:20
AuthorDAH

[Data]
Number1076 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.
Start2014-06-03 20:04
End2014-06-03 22:02
Added2014-06-04 16:24
AuthorDAH

[Data]
Number1089 Instrtument: MST Radar. The transmitter for antenna sector C was out of action with a blown fuse.
Start2014-06-04 17:39
End2014-06-05 09:35
Added2014-07-02 10:31
AuthorDAH

[Data]
Number1078 Instrument: Campbell Scientific Wind Sensors. The raw data files contain zeros for all parameters (including wind direction) for this period.
Start2014-06-05 19:37
End2014-06-05 20:20
Added2014-06-18 11:28
AuthorDAH

[Data]
Number1088 Instrumehnt: MST Radar. The transmitter for antenna sector B was out of action with a blown fuse.
Start2014-06-06 07:31
End2014-06-10 09:09
Added2014-07-02 10:26
AuthorDAH

[Data]
Number1079 Instrument: Campbell Scientific Wind Sensors. The raw data files contain zeros for all parameters (including wind direction) for this period.
Start2014-06-07 10:24
End2014-06-07 10:41
Added2014-06-18 11:34
AuthorDAH

[Data]
Number1080 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.
Start2014-06-09 03:53
End2014-06-09 20:27
Added2014-06-18 11:44
AuthorDAH

[Data]
Number1081 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.
Start2014-06-11 22:04
End2014-06-18 11:44
Added2014-06-18 11:47
AuthorZKO

[Data]
Number1082 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.
Start2014-06-12 00:00
End2014-06-12 22:55
Added2014-06-18 11:52
AuthorDAH

[Data]
Number1083
Start2014-06-13 05:59
End2014-06-13 11:52
Added2014-06-18 11:56
AuthorZKO

[Data]
Number1084 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.
Start2014-06-13 05:59
End2014-06-13 11:56
Added2014-06-18 16:37
AuthorZKO

[Data]
Number1077 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.
Start2014-06-17 16:12
End2014-06-18 07:19
Added2014-06-18 10:21
AuthorDAH

[Data]
Number1087 Instrument: MST Radar. The transmitter for antenna sector C was out of action with a blown fuse.
Start2014-06-20 05:44
End2014-06-20 09:49
Added2014-07-02 10:15
AuthorDAH

[Data]
Number1866 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.
Start2014-06-22 14:50
End2014-06-22 15:40
Added2017-09-15 15:34
AuthorDAH

[Data]
Number1086 Instrument: MST Radar. The transmitter for antenna sector B was out of action with a blown fuse.
Start2014-06-23 01:56
End2014-06-25 15:58
Added2014-07-02 10:10
AuthorDAH

[Data]
Number1085 Instrument: UPS units. The units switched to battery power for approximately 22 s in response to an input power problem.
Start2014-06-28 16:14
End2014-06-28 16:14
Added2014-06-30 12:15
AuthorDAH

[Data]
Number1090 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.
Start2014-07-03 06:24
End2014-07-03 06:24
Added2014-07-03 08:31
AuthorDAH

[Data]
Number1097 INstrument: MST Radar. The transmitter for antenna sector C was out of action with a blown fuse.
Start2014-07-04 14:38
End2014-07-08 08:53
Added2014-07-29 14:22
AuthorDAH

[Data]
Number1091 Instrument: UPS Units. The units switched to battery power in response to a ~ 1 s input power problem.
Start2014-07-04 14:43
End2014-07-04 14:43
Added2014-07-04 16:12
AuthorDAH

[Data]
Number1862 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.
Start2014-07-04 15:00
End2014-07-04 15:40
Added2017-09-15 14:25
AuthorDAH

[Data]
Number1092 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.
Start2014-07-10 09:13
End2014-07-11 07:37
Added2014-07-11 08:43
AuthorDAH

[Data]
Number1093 Instrument: UPS units. The units switched to battery power briefly (~ 1 s) in response to an input power problem.
Start2014-07-19 02:11
End2014-07-19 02:11
Added2014-07-21 12:54
AuthorDAH

[Data]
Number1094 INstrument: MST Radar. The transmitter for antenna sector B was out of action with a blown fuse.
Start2014-07-20 03:19
End2014-07-22 08:47
Added2014-07-22 10:27
AuthorDAH

[Data]
Number1095 Instrument: Vaisala LD40 Ceilometer. The data acquisition program shut down unexpectedly leading to a gap in the observations.
Start2014-07-24 03:00
End2014-07-24 07:00
Added2014-07-24 08:52
AuthorDAH

[Data]
Number1099 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.
Start2014-07-24 18:15
End2014-08-01 00:00
Added2014-08-01 10:02
AuthorDAH

[Data]
Number1096 Instrument: MST Radar. The transmitter powering antenna sector C was out of action with a blown fuse.
Start2014-07-27 02:14
End2014-07-29 09:33
Added2014-07-29 14:15
AuthorDAH

[Data]
Number1863 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.
Start2014-07-27 08:40
End2014-07-27 09:30
Added2017-09-15 14:42
AuthorDAH

[Data]
Number1098 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.
Start2014-07-27 14:40
End2014-07-29 09:00
Added2014-07-29 15:29
AuthorDAH

[Data]
Number1864 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.
Start2014-07-29 17:20
End2014-07-29 18:10
Added2017-09-15 14:46
AuthorDAH

[Data]
Number1865 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.
Start2014-07-30 17:30
End2014-07-30 18:20
Added2017-09-15 14:51
AuthorDAH

[Data]
Number1859 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.
Start2014-08-06 18:45
End2014-08-06 19:50
Added2017-09-15 12:00
AuthorDAH

[Data]
Number1860 Instrument: MST Radar. The horizontal wind speed from the v4 processing is unrealistically large during this period at just above 8km altitude.
Start2014-08-07 17:20
End2014-08-07 18:10
Added2017-09-15 12:07
AuthorDAH

[Data]
Number1861 Instrument: MST Radar. The horizontal wind speed from the v4 processing is unrealistically large during this period at just above 8km altitude.
Start2014-08-08 20:20
End2014-08-08 21:00
Added2017-09-15 12:13
AuthorDAH

[Data]
Number1100 Instrument: UPS units. The units switched briefly (~ 1 s) to battery power in response to an input power problem.
Start2014-08-14 12:59
End2014-08-14 12:59
Added2014-08-14 14:06
AuthorDAH

[Data]
Number1101 Instrument: MST Radar. The radar suffered from a short period of interference. This appears to have omnly affected the m-mode observations.
Start2014-08-19 09:50
End2014-08-19 10:45
Added2014-08-21 08:35
AuthorDAH

[Data]
Number1102 Instrument: UPS Units. The units switched to battery power for approximately 1 s in response to an input power problem.
Start2014-08-22 16:47
End2014-08-22 16:47
Added2014-08-26 09:41
AuthorDAH

[Data]
Number1103 Instrument: MST Radar. The transmitter for antenna sector B was out of action with a blown fuse.
Start2014-08-22 22:44
End2014-08-26 09:20
Added2014-08-26 11:13
AuthorDAH

[Data]
Number1104 Instrument: UPS Units. The units switched to battery power for ~ 1 s in response to an input power problem.
Start2014-09-13 12:49
End2014-09-13 12:49
Added2014-09-15 09:36
AuthorDAH

[Data]
Number1105 Instrument: UPS Units. The units switched to battery power for ~ 1 s in response to an input power problem.
Start2014-09-15 16:23
End2014-09-15 16:23
Added2014-09-16 08:59
AuthorDAH

[Data]
Number1106 Instrument: UPS Units. The units switched to battery power for ~ 1 s in response to an input power problem.
Start2014-09-15 23:54
End2014-09-15 23:54
Added2014-09-16 09:09
AuthorDAH

[Data]
Number1119 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.
Start2014-09-17 01:56
End2014-10-13 13:47
Added2014-10-17 16:24
AuthorDAH

[Data]
Number1107 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.
Start2014-09-19 09:15
End2014-09-24 17:30
Added2014-09-26 15:35
AuthorDAH

[Data]
Number1108 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.
Start2014-09-25 07:55
End2014-09-25 18:29
Added2014-09-26 16:35
AuthorDAH

[Data]
Number1109 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.
Start2014-09-25 18:35
End2014-09-29 09:34
Added2014-09-29 09:42
AuthorDAH

[Data]
Number1110 Instrument: MST Radar. The radar appears to have suffered from interference, which led to a reduction in altitude coverage.
Start2014-09-29 10:15
End2014-09-29 11:30
Added2014-09-30 08:44
AuthorDAH

[Data]
Number1111 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.
Start2014-09-30 09:00
End2014-09-30 09:43
Added2014-10-01 08:35
AuthorDAH

[Data]
Number1120 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.
Start2014-09-30 10:00
End2014-10-07 11:57
Added2014-10-21 16:27
AuthorDAH

[Data]
Number1112 Instrument: UPS Units. The units switched to battery power in response to a a brief (~ 1 s) input power problem.
Start2014-10-08 11:24
End2014-10-08 11:24
Added2014-10-08 14:35
AuthorDAH

[Data]
Number1113 Instrument: UPS Units. The units switched to battery power briefly (~ 1 s) owing to an input power problem.
Start2014-10-08 17:33
End2014-10-08 17:33
Added2014-10-10 09:48
AuthorDAH

[Data]
Number1114 Instrument: UPS Units. The units switched to battery power briefly (~ 1 s) owing to an input power problem.
Start2014-10-08 21:58
End2014-10-08 21:58
Added2014-10-10 10:17
AuthorZKO

[Data]
Number1115 Instrument: UPS Units. The units switched to battery power briefly (~ 1 s) owing to an input power problem.
Start2014-10-08 22:29
End2014-10-08 22:29
Added2014-10-10 10:18
AuthorDAH

[Data]
Number1116 Instrument: UPS Units. The units switched to battery power briefly (~ 1 s) owing to an input power problem.
Start2014-10-09 03:32
End2014-10-09 03:32
Added2014-10-10 10:20
AuthorDAH

[Data]
Number1117 Instrument: UPS Units. The units switched to battery power briefly (~ 1 s) owing to an input power problem.
Start2014-10-09 03:44
End2014-10-09 03:44
Added2014-10-10 10:21
AuthorDAH

[Data]
Number1118 Instrument: UPS Units. The units switched briefly (~ 1 s) to battery power in response to an input power problem.
Start2014-10-16 20:02
End2014-10-16 20:02
Added2014-10-17 08:33
AuthorDAH

[Data]
Number1123 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.
Start2014-11-01 23:11
End2014-11-01 23:17
Added2014-11-13 11:52
AuthorDAH

[Data]
Number1125 Instrument: MST Radar. The transmitter for antenna sector E was out of action owing to a blown fuse.
Start2014-11-04 03:59
End2014-11-04 11:14
Added2014-11-14 14:24
AuthorDAH

[Data]
Number1121 Instrument: UPS units. The UPS units switched briefly (~ 1 s) to battery power in response to an input power problem.
Start2014-11-09 17:53
End2014-11-09 17:53
Added2014-11-10 11:17
AuthorDAH

[Data]
Number1122 Instrument: UPS units. The UPS units switched briefly (~ 1 s) to battery power in response to an input power problem.
Start2014-11-09 18:23
End2014-11-09 18:23
Added2014-11-10 11:24
AuthorDAH

[Data]
Number1124 Instrument: UPS units. The units switched to battery power briefly (~ 1 s) in response to an input power problem.
Start2014-11-13 12:42
End2014-11-13 12:42
Added2014-11-13 16:29
AuthorDAH

[Data]
Number1130 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").
Start2014-11-15 19:43
End2014-11-18 09:53
Added2015-01-05 14:46
AuthorDAH

[Data]
Number1126 Instrument: MST Radar. The transmitter for antenna sector C was out of action with error code 7: "Analogue Parameter Error at State 4".
Start2014-11-21 01:53
End2014-11-21 10:52
Added2014-11-21 15:36
AuthorDAH

[Data]
Number1129 Instrument: MST Radar. The transmitter for antenna sector C was out of action owing to a blown fuse.
Start2014-12-23 08:01
End2014-12-23 11:58
Added2015-01-05 14:28
AuthorDAH

[Data]
Number1128 Instrument: MST Radar. The transmitter for antenna sector C was out of action owing to an analogue error.
Start2014-12-27 13:28
End2014-12-30 12:47
Added2015-01-05 14:27
AuthorDAH

[Data]
Number1127 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.
Start2014-12-30 12:26
End2014-12-30 12:47
Added2015-01-05 12:44
AuthorDAH

[Data]
Number1131 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.
Start2015-01-05 07:00
End2015-01-05 20:00
Added2015-01-06 08:41
AuthorDAH

[Data]
Number1132 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.
Start2015-01-07 13:44
End2015-01-07 13:44
Added2015-01-08 08:40
AuthorDAH

[Data]
Number1133 Instrument: UPS units. The units switched briefly (~ 1 s) to battery power twice, within a few seconds in response to an input power problem.
Start2015-01-14 22:20
End2015-01-14 22:20
Added2015-01-15 11:09
AuthorDAH

[Data]
Number1134 Instrument: UPS Units. Three of the six units switched to battery power briefly (~ 1 s) in response to an input power prpblem.
Start2015-01-18 12:22
End2015-01-18 12:22
Added2015-01-19 09:01
AuthorDAH

[Data]
Number1136 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.
Start2015-01-23 21:30
End2015-01-26 09:03
Added2015-01-26 09:14
AuthorZKO

[Data]
Number1135 Instrument: UPS Units. The units switched to battery power briefly (~ 1 s) in response to an input power problem.
Start2015-01-24 14:52
End2015-01-24 14:52
Added2015-01-26 09:03
AuthorDAH

[Data]
Number1137 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.
Start2015-02-01 13:26
End2015-02-02 15:38
Added2015-02-02 16:35
AuthorDAH

[Data]
Number1138 Instrument: MST Radar. The transmitter for antenna sector C was out of action owing to a blown fuse.
Start2015-02-03 10:40
End2015-02-04 10:15
Added2015-02-04 11:48
AuthorDAH

[Data]
Number1139 Instrument: UPS units. The units switched to battery power briefly (~ 1 s) in response to an input power problem.
Start2015-02-04 11:48
End2015-02-04 11:48
Added2015-02-04 11:50
AuthorDAH

[Data]
Number1140 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.
Start2015-03-29 14:43
End2015-03-29 14:43
Added2015-03-30 09:39
AuthorDAH

[Data]
Number1141 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.
Start2015-03-29 14:44
End2015-03-30 09:01
Added2015-03-30 11:12
AuthorDAH

[Data]
Number1142 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.
Start2015-03-31 09:05
End2015-03-31 10:56
Added2015-03-31 14:19
AuthorDAH

[Data]
Number1143 Instrument: UPS Units. The units switched to battery power owing to a brief (~ 1 s) input power problem.
Start2015-04-10 05:10
End2015-04-10 05:10
Added2015-04-10 09:32
AuthorDAH

[Data]
Number1144 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.
Start2015-04-10 05:11
End2015-04-10 07:27
Added2015-04-10 11:21
AuthorDAH

[Data]
Number1145 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.
Start2015-04-10 10:19
End2015-04-10 10:19
Added2015-04-10 11:29
AuthorDAH

[Data]
Number1146 Instrument: MST Radar. The transmitter for antenna sector B was out of action with a blown HV fuse.
Start2015-04-11 13:23
End2015-04-14 09:19
Added2015-04-16 09:17
AuthorDAH

[Data]
Number1147 Instrument: MST Radar. The transmitter for antenna sector B was out of action with a blown HV fuse.
Start2015-04-14 16:55
End2015-04-15 14:02
Added2015-04-16 09:18
AuthorDAH

[Data]
Number1148 Instrument: Vaisala LD40 Ceilometer. The data acquisition software stopped logging messages from the instrument. DAH remotely restarted the software.
Start2015-04-20 15:14
End2015-04-21 07:19
Added2015-04-21 08:46
AuthorDAH

[Data]
Number1149 Instrument: MST Radar. The transmitter for antenna section C was out of action with a blown HV fuse.
Start2015-04-22 02:50
End2015-04-22 08:55
Added2015-04-28 14:03
AuthorDAH

[Data]
Number1150 Instrument: MST Radar. The transmitter for antenna sector B was out of action with a blown HV fuse.
Start2015-04-27 10:30
End2015-04-28 09:16
Added2015-04-28 14:04
AuthorDAH

[Data]
Number1151 Instrument: MST Radar. The transmitter for antenna sector C was out of action with a blown HV fuse.
Start2015-05-03 19:09
End2015-05-05 09:27
Added2015-05-05 10:33
AuthorDAH

[Data]
Number1152 Instrument: Vaisala LD40 Ceilometer. The data aquisition software unexpectedly stopped acquiring data and had to be restarted.
Start2015-05-08 15:26
End2015-05-11 08:58
Added2015-05-12 09:19
AuthorDAH

[Data]
Number1153 Instrument: MST Radar. The transmitter for antenna sector D was out of action with a blown HV fuse.
Start2015-05-11 19:14
End2015-05-12 09:07
Added2015-05-12 11:11
AuthorDAH

[Data]
Number1154 Instrument: MST Radar. The transmitter for antenna sector B was out of action with a blown fuse.
Start2015-05-14 06:18
End2015-05-14 09:37
Added2015-05-14 15:08
AuthorDAH

[Data]
Number1157 Instrument: MST Radar. Beam steering unit 28 indicated a low supply voltage for a single dwell.
Start2015-05-19 18:01
End2015-05-19 18:02
Added2015-06-29 10:00
AuthorDAH

[Data]
Number1155 Instrument: Vaisala LD40 Ceilometer. The data acqusition software stopped recording messages and had to be restarted.
Start2015-05-20 15:37
End2015-05-21 07:08
Added2015-05-21 08:10
AuthorDAH

[Data]
Number1156 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.
Start2015-06-13 18:50
End2015-06-13 19:50
Added2015-06-15 16:15
AuthorDAH

[Data]
Number1158 INstrument: MST Radar. The transmitter for antenna sector C was out of action during this period owing to a blown HV fuse.
Start2015-06-17 15:33
End2015-06-18 09:44
Added2015-06-29 10:02
AuthorDAH

[Data]
Number1837 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.
Start2015-06-19 18:40
End2015-06-19 19:10
Added2017-09-12 09:43
AuthorDAH

[Data]
Number1159 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.
Start2015-06-25 03:14
End2015-06-25 03:14
Added2015-06-29 10:10
AuthorDAH

[Data]
Number1160 Instrument: Vaisala LD40. The data aquisition software on PC gaius stopped logging the data messages and had to be restarted.
Start2015-06-25 15:19
End2015-06-26 08:10
Added2015-06-29 10:14
AuthorDAH

[Data]
Number1161 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.
Start2015-06-26 11:45
End2015-06-26 14:30
Added2015-06-29 10:23
AuthorDAH

[Data]
Number1838 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.
Start2015-06-26 12:40
End2015-06-26 14:20
Added2017-09-12 10:18
AuthorDAH

[Data]
Number1162 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.
Start2015-06-30 09:52
End2015-06-30 10:59
Added2015-07-21 14:57
AuthorDAH

[Data]
Number1163 Instrument: MST Radar. The transmitter for antenna sector B was out of action during this period owing to a blown fuse.
Start2015-07-02 23:30
End2015-07-03 10:05
Added2015-07-21 15:01
AuthorDAH

[Data]
Number1164 Instrument: MST Radar. The transmitter for antenna sector B was out of action during this period owing to a blown fuse.
Start2015-07-03 12:07
End2015-07-03 14:53
Added2015-07-21 15:04
AuthorDAH

[Data]
Number1165 Instrument: MST Radar. The transmitter for antenna sector B was out of action during this period owing to a blown fuse.
Start2015-07-04 16:27
End2015-07-07 10:21
Added2015-07-21 15:05
AuthorDAH

[Data]
Number1166 Instrument: MST Radar. The transmitter for antenna sector B was out of action during this period owing to a blown fuse.
Start2015-07-07 13:10
End2015-07-08 09:37
Added2015-07-21 15:06
AuthorDAH

[Data]
Number1167 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.
Start2015-07-10 10:14
End2015-07-10 14:41
Added2015-07-21 16:14
AuthorDAH

[Data]
Number1168 Instrument: MST Radar. The transmitter for antenna sector B was out of action during this period owing to a blown fuse.
Start2015-07-11 23:48
End2015-07-14 10:06
Added2015-07-21 16:17
AuthorDAH

[Data]
Number1169 Instrument: MST Radar. The transmitter for antenna sector B was out of action during this period owing to a blown fuse.
Start2015-07-15 07:36
End2015-07-16 09:35
Added2015-07-21 16:18
AuthorDAH

[Data]
Number1170 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.
Start2015-07-17 12:46
End2015-07-18 14:19
Added2015-07-21 16:24
AuthorDAH

[Data]
Number1171 Instrument: MST Radar. The beam controller briefly (i.e. for one dwell) reported low output power for antenna sector B
Start2015-07-21 10:38
End2015-07-21 10:39
Added2015-07-21 16:25
AuthorZKO

[Data]
Number1172 Instrument: MST Radar. The beam steering controller reported slightly elevated (> 2.5) VSWR values for unit 11 during this period.
Start2015-07-23 14:59
End2015-07-23 15:04
Added2015-08-04 09:36
AuthorDAH

[Data]
Number1173 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.
Start2015-07-25 11:52
End2015-07-25 12:06
Added2015-08-04 09:58
AuthorDAH

[Data]
Number1174 Instrument: MST Radar. The transmitter for antenna sector B was out of action owing to a blown HV fuse.
Start2015-07-25 12:46
End2015-07-28 09:18
Added2015-08-04 10:06
AuthorDAH

[Data]
Number1175 Instrument: MST Radar. The beam steering controller reported slightly elevated (> 2.5) VSWR values for unit 11 during this period.
Start2015-07-28 15:33
End2015-07-28 15:36
Added2015-08-04 10:08
AuthorDAH

[Data]
Number1176 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.
Start2015-07-29 13:51
End2015-07-29 15:10
Added2015-08-04 10:10
AuthorDAH

[Data]
Number1177 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.
Start2015-07-30 13:45
End2015-07-30 15:15
Added2015-08-04 10:18
AuthorDAH

[Data]
Number1178 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.
Start2015-07-30 17:40
End2015-08-03 15:50
Added2015-08-04 11:49
AuthorDAH

[Data]
Number1179 Instrument: MST Radar. The beam steering controller reported slightly elevated (> 2.5) VSWR values for unit 11 during this period.
Start2015-07-31 12:18
End2015-07-31 12:21
Added2015-08-04 11:54
AuthorDAH

[Data]
Number1180 Instrument: MST Radar. The beam steering controller reported slightly elevated (> 2.5) VSWR values for unit 11 during this period.
Start2015-08-03 11:15
End2015-08-03 11:16
Added2015-08-04 11:55
AuthorDAH

[Data]
Number1181 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.
Start2015-08-04 10:37
End2015-08-04 11:00
Added2015-08-04 12:10
AuthorDAH

[Data]
Number1182 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.
Start2015-08-07 21:02
End2015-08-08 02:19
Added2015-08-14 15:35
AuthorDAH

[Data]
Number1183 Instrument: MST Radar. The transmitter for antenna sector B was out of action during this period owing to a blown HV fuse.
Start2015-08-08 04:49
End2015-08-11 09:49
Added2015-08-14 15:36
AuthorDAH

[Data]
Number1188 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.
Start2015-08-09 02:22
End2015-08-09 02:22
Added2015-08-25 09:24
AuthorDAH

[Data]
Number1189 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.
Start2015-08-12 16:29
End2015-08-13 07:05
Added2015-08-25 09:29
AuthorZKO

[Data]
Number1190 Instrument: MST Radar. The transmitter for antenna sector B was out of action with a blown fuse.
Start2015-08-15 08:31
End2015-08-17 16:41
Added2015-08-25 10:36
AuthorDAH

[Data]
Number1191 Instrument: MST Radar. The transmitter for antenna sector A was out of action with an analogue error. The final heater voltage had dropped below the minimum permissible value.
Start2015-08-17 15:48
End2015-08-17 16:40
Added2015-08-25 11:54
AuthorDAH

[Data]
Number1192 Instrument: MST Radar. The transmitter for antenna sector A was out of action with an analogue error. The final heater voltage had dropped below the minimum permissible value.
Start2015-08-17 18:02
End2015-08-18 08:56
Added2015-08-25 12:04
AuthorDAH

[Data]
Number1193 Instrument: MST Radar. The transmitter for antenna sector B was out of action with a blown HV fuse.
Start2015-08-17 18:04
End2015-08-18 08:56
Added2015-08-25 12:07
AuthorDAH

[Data]
Number1194 Instrument: MST Radar. The beam steering controller indicated that the forward power for transmitters C and E was below the expected level for 1 dwell.
Start2015-08-17 21:47
End2015-08-17 21:47
Added2015-08-25 12:14
AuthorDAH

[Data]
Number1195 Instrument: MST Radar. The beam steering controller indicated that the formward power was low for transmiiters A, D, and E across two dwells.
Start2015-08-18 16:29
End2015-08-18 16:30
Added2015-08-25 12:25
AuthorDAH

[Data]
Number1184 Instrument: UPS Units. All units passed a self test.
Start2015-08-20 14:10
End2015-08-20 14:10
Added2015-08-21 14:13
AuthorDAH

[Data]
Number1196 Instrument: MST Radar. The transmitter for antenna sector A was out of action with an analogue error.
Start2015-08-20 14:43
End2015-08-20 15:08
Added2015-08-25 12:31
AuthorDAH

[Data]
Number1197 Instrument: MST Radar. The socket connection between the radar control and beam steering computers was broken unexpectedly. This appears to have led to a 5 minute gap between two adjacent cycles.
Start2015-08-21 08:54
End2015-08-21 08:59
Added2015-08-25 14:01
AuthorDAH

[Data]
Number1198 INstrument: MST Radar. The beam steering controller indicated that the forward power for transmitter C was low for a few dwells.
Start2015-08-21 08:57
End2015-08-21 09:00
Added2015-08-25 14:15
AuthorDAH

[Data]
Number1185 Instrument: UPS units. The units briefly (~ 1 s) switched to battery power in response to an input power problem.
Start2015-08-21 16:47
End2015-08-21 16:47
Added2015-08-24 08:28
AuthorDAH

[Data]
Number1199 Instrument: MST Radar. The transmitter for antenna sector A was out of action with an analogue error. The error was cleared by the loss of mains/UPS power around 2015-08-23 06 UT, although the transmitter was not properly back in action until 13:45 that afternoon.
Start2015-08-22 15:45
End2015-08-23 09:25
Added2015-08-25 14:26
AuthorDAH

[Data]
Number1186 Instrument: UPS units. There appears to have been an electricity outage that lasted for over 3 and a half hours. The UPS units became fully discharged after 20 - 30 minutes, leading to all equipment and PCs shutting down. PCs claudius, julius, and tiberius all rebooted automatically when the power was restored. This allowed DAH to remotely restart the MST radar and the WXT520 data acquisition. However, PC gaius was still down at the time of writing.
Start2015-08-23 05:30
End2015-08-23 09:10
Added2015-08-24 09:22
AuthorDAH

[Data]
Number1187 Instrument: MST Radar. The radar was out of action during this period owing to a loss of mains electricity, which lasted for over 3 hours. The radar control PC appears to have shut down at around 05:50 UT, after its UPS unit became fully discharged. After the power and internet connection were resumed (shortly after 09 UT), DAH deleted the spectral files for the final, incomplete cycle, which began at 05:47:47 UT. This was in case they crashed the signal processing software. He was able to remotely restart the radar at 12:40 UT, although the beam steering unit does not appear to have been changing the beam pointing direction (DAH had blocked the transfer of data to the Met Office during the restart period). It gave a warning message, "Refusing connection. Beam command socket already connected". Consequently DAH stopped the radar at 13:15 UT before rebooting the beam steering PC, which does not appear to have shut down during the electricity outage. The beam steering unit appeared to operate as expected when DAH restarted the radar at 13:45 UT. However, he did not remove the block from the Met Office's data feed until around 15:30 UT, when he was confident that everything was back to normal.
Start2015-08-23 05:47
End2015-08-24 09:22
Added2015-08-24 14:52
AuthorDAH

[Data]
Number1200 Instrument: MST Radar. The beam steering controller indicated that the forward power for transmitter A was slightly low during this period.
Start2015-08-23 17:11
End2015-08-23 17:13
Added2015-08-25 14:38
AuthorDAH

[Data]
Number1201 Instrument: MST Radar. The beam steering controller indicated that the forward power for transmitter A was slightly low for this short period.
Start2015-08-23 21:20
End2015-08-23 21:21
Added2015-08-25 14:40
AuthorDAH

[Data]
Number1202 Instrument: MST Radar. The transmitter for antenna sector A was out of action with an analogue error.
Start2015-08-24 18:42
End2015-08-25 07:02
Added2015-08-25 14:55
AuthorDAH

[Data]
Number1203 Instrument: MST Radar. The beam steering controller indicated that the forward power for transmitter B was slightly low during this period.
Start2015-08-25 03:25
End2015-08-25 03:26
Added2015-08-25 14:57
AuthorDAH

[Data]
Number1204 Instrument: MST Radar. The transmitter for antenna sector A was out of action with an analogue error.
Start2015-08-25 10:12
End2015-08-25 10:23
Added2015-08-25 14:58
AuthorDAH

[Data]
Number1205 Instrument: MST Radar. The transmitter for antenna sector A was out of action with an analogue error.
Start2015-08-25 11:28
End2015-08-25 11:33
Added2015-08-25 14:58
AuthorDAH

[Data]
Number1206 Instrument: MST Radar. The transmitter for antenna sector A was out of action with an analogue error.
Start2015-08-25 11:57
End2015-08-25 12:05
Added2015-08-25 14:59
AuthorDAH

[Data]
Number1207 Instrument: MST Radar. The transmitter for antenna sector A was out of action with an analogue error.
Start2015-08-25 13:43
End2015-08-25 13:53
Added2015-08-25 15:00
AuthorDAH

[Data]
Number1209 Instrument: MST Radar. The transmitter for antenna sector A was out of action owing to its heater voltage dropping below the minimum permissible value.
Start2015-08-25 14:57
End2015-08-25 15:12
Added2015-09-11 15:10
AuthorDAH

[Data]
Number1210 Instrument: MST Radar. The transmitter for antenna sector A was out of action owing to its heater voltage dropping below the minimum permissible value.
Start2015-08-25 17:08
End2015-08-26 07:02
Added2015-09-11 15:12
AuthorZKO

[Data]
Number1211 Instrument: MST Radar. The transmitter for antenna sector A was out of action for most of this period. It auto-shut-down owing to a low heater voltage 08:46 - 08:49 and 09:18 - 09:21 UT. It was then shut down 09:36 - 11:47 UT so that LD could change the voltage regulator. The output power appears to have shown some fluctuations later the same day, 16:25 - 16:41 UT, although without the tranmsitter shutting down.
Start2015-08-26 08:46
End2015-08-26 11:47
Added2015-09-11 16:22
AuthorDAH

[Data]
Number1212 Instrument: MST Radar. The transmitter for antenna sector A reported a drop in output power during this brief period although it did not auto-shut-down.
Start2015-09-03 14:56
End2015-09-03 14:58
Added2015-09-11 16:32
AuthorDAH

[Data]
Number1213 Instrument: MST Radar. The transmitter for antenna sector A was out of action owing to its heater voltage dropping below the minimum permissible value.
Start2015-09-10 15:20
End2015-09-10 15:37
Added2015-09-11 16:34
AuthorDAH

[Data]
Number1214 Instrument: MST Radar. The transmitter for antenna sector A was out of action owing to its heater voltage dropping below the minimum permissible value.
Start2015-09-10 16:22
End2015-09-11 08:12
Added2015-09-11 16:35
AuthorDAH

[Data]
Number1208 Instrument: MST Radar. The radar was shut down during this short period to allow beam steering unit 68 to be swapped. It had been giving readings that were towards the edge of the permissible range.
Start2015-09-11 08:59
End2015-09-11 09:22
Added2015-09-11 11:40
AuthorDAH

[Data]
Number1215 Instrument: MST Radar. The transmitter for antenna section A auto-shut-down owing to a low heater voltage.
Start2015-09-13 04:34
End2015-09-14 07:04
Added2015-09-14 09:16
AuthorDAH

[Data]
Number1216 Instrument: MST Radar. The transmitter for antenna section A auto-shut-down owing to a low heater voltage.
Start2015-09-14 08:35
End2015-09-14 10:25
Added2015-09-14 15:01
AuthorDAH

[Data]
Number1217 Instrument: MST Radar. The transmitter for antenna section A auto-shut-down owing to a low heater voltage.
Start2015-09-14 11:59
End2015-09-14 13:03
Added2015-09-14 15:02
AuthorDAH

[Data]
Number1224 Instrument: MST Radar. The transmitter for antenna section A auto-shut-down owing to a low heater voltage.
Start2015-09-14 13:57
End2015-09-14 14:16
Added2015-10-06 12:06
AuthorDAH

[Data] <
Number1218 Instrument: MST Radar. The transmitter for antenna section A auto-shut-down owing to a low heater voltage.
Start2015-09-14 14:54
End2015-09-14 15:11
Added2015-09-14 16:22