VERY LONG BASELINE ARRAY OBSERVING LOG -------------------------------------- Project: BM245C Observer: Marscher, A. Project type: VLBA Obs filename: bm245ccrd.* Date/Day: 2006APR04/094 Ants Scheduled: SC HN NL FD LA PT KP OV BR MK =UT-Time===Comment===============================================MF#===%AD==AMD= Operator is Anthony Sowinski. UT1-UTC correct, vlcock and gps delta okay. Overcast at HN,PT,KP,MK HN recording on NRAO-162, bank B. FD recording on NRAO-024, bank B. LA recording on NRAO-130, bank A. PT recording on NRAO-048, bank B. KP recording on NRAO-108, bank B. BR recording on NRAO-199, bank B. MK recording on NRAO-101, bank B. 2300 Begin file. 2300-2310 *SC,NL,OV: Tapes not mounted when project started HUERR 300 30 and unable to get them to start recording until beginning of next scan. 2310 Begin at MK. 2319 OV reports overcast, damp, drizzling. 2320 High winds at OV. 2327-2359 *OV Stowed for high winds and motor currents WEA 100 32 0000 Date is 2006APR04/094. 0022 BR now recording on NRAO-079, bank A. 0101 Readbacks okay. 0139 KP Wea: rain and high winds. 0221 %MK Focus position is often off by about 0.1 mm either with or without clearable focus drive faults. 0220-0224 %Also, just had a commanded focus position that was 1mm off. 0227 MK Re-commanding focus position changed command value while clearing drive faults. 0242 Gusty winds at LA. 0255 Readbacks okay. 0301-0303 *KP wind stow; repointed WEA 100 2 0338-0340 *OV wind stow; repointed WEA 100 2 0340-0349 *OV wind stow; pause; repointed WEA 100 9 0354 Raining at MK. 0501 Readbacks okay. 0524-0526 *KP wind stow; repointed WEA 100 2 0548 Operator is Sonja Mendoza. 0600-0601 *PT Resetting formatter to clear error; causes FMTR 100 1 a brief pause in recording. 0600 Readbacks okay. 0601-0604 *KP Antenna autostowed, possibly caused by wind. WEA 100 3 0623-0626 *KP wind stow; repointed WEA 100 3 0637-0753 *FD Antenna autostowing; reason unknown, possibly 17970 100 76 a power glitch. Site computer rebooted itself. 0639 *FD Site has lost commercial power; on generator. 17970 0645 &FD Site tech notified of power outage at site. 17970 0700-0712 *KP wind stow; repointed WEA 100 12 0701 Readbacks okay. 0703 *FD Removing FD from observation until power 17970 is restored. 0710 &FD Calling out site tech; supply and return 17970 pressure on compressor A equalized; several receivers, including 7mm receiver warming. 0738-0746 *KP wind stow; repointed WEA 100 8 0753 *FD Power is back on; site tech arrived and 17970 compressor A is back on line; 7mm receiver warm (104K on 15K stage; will take some time to cool). Still have EL#1 low lube pressure problem, tech working on it. 0753-1225 *FD 7mm warm due to power outage/compressor 17970 100 272 failure. Very slowly cooling. Will put back in project when receiver has cooled down some more. 0826-0843 *KP wind stow; will repoint when winds die down. WEA 100 17 0848-0931 *KP wind stow; will repoint when winds die down. WEA 100 43 0901 Readbacks okay. 0909 Readbacks okay. 0949-1007 *KP wind stow; will repoint when winds die down. WEA 100 18 1006 Readbacks okay. 1011 Readbacks okay. 1015 SC WEA: Partly cloudy skies, dry. 1046-1114 *KP wind stow; repointed WEA 100 28 1101 Readbacks okay. 1102 %OV WEA: wind gusts > 35 mph. 1149 Readbacks okay. 1150-1204 *KP wind stow; repointed. WEA 100 14 1152 *KP WEA: Precipitation starting. 1200 NL WEA: High, thin clouds, mostly clear skies. Dry. 1225-1335 %FD Putting site back into observation, now that 17970 100 70 7mm receiver has cooled somewhat. 15K stage still warm but cooling (15K stage is 68K). 1227 HN WEA: site tech reports low broken clouds, dry. 1237 Readbacks okay. 1239 FD WEA: Site tech reports high, thin cirrus clouds, dry. 1301 Readbacks okay. 1309 Readbacks okay. 1329-1336 *FD Antenna autostowed, maybe due to power glitch. COM 100 7 Loss of communications, site computer rebooted itself. Repointed. 1344 New operator is Jim Ogle. 1345 Readbacks okay. 1355 %High wind gusts at OV. 1405 Readbacks okay. 1416 LA reports scattered high thin clouds. 1500 End. Downtime Summary: Total downtime : 649 min Percentage downtime of observing: 6.8% Average downtime per hour : 4.1 min Total scheduled observing time (# Antennas): 9600 min (10) Notes: * = Entries where data was affected. % = Entries where data may have been affected. & = Entries where the site tech was called out. WEA = Weather entries. MF# = Maintenance form or major downtime category associated with a problem. %AD = The percentage of an antenna affected by a problem. AMD = Total antenna-minutes downtime for a problem. Tsys = System Temperature (TP/SP x Tcal/2) ACU = Antenna Control Unit FRM = Focus/Rotation Mount RFI = Radio Frequency Interference VME = Site control computer CB = Circuit Breaker vclock = Program that compares site clock time to a standard.