VERY LONG BASELINE ARRAY OBSERVING LOG -------------------------------------- Project: BK107A Observer: Krichbaum, T. Project type: VLBA Obs filename: bk107acrd.* Date/Day: 2004FEB25/056 Ants Scheduled: SC HN NL FD LA PT KP OV BR MK =UT-Time===Comment===============================================MF#===%AD==AMD= 0626 Begin file VCLOCK check ok. SC at -0.122 UT1-UTC check ok. GPS delta < 10 us Operator: T. Perreault *HN dew point reading much higher than current air 13481 temperature. Estimated value of refraction will be off. 0626-1337 *HN 3mm DEWAR is cooling. Seeing elevated system CRYO 33 142 temperatures. 0626-2030 *FD 7mm DEWAR marginally warm. System temperatures CRYO 17 143 are slightly elevated. 0626-2030 *SC and BR do not have 3mm receivers, schedule does SCH 66 557 not take that into account and has 3mm scans running at both sites. Obviously data won't be any good! 0640 New operator is Jim Ogle. 0645-2030 *FD 3mm receiver appears to be dead, system 13512 33 272 temperatures are all bad. Switched power readings on all eight BBCs are zero or negative. 0657 Readbacks okay. 0702-0709 *NL tape not moving, not sure why. Manually REC 100 7 moved tape forward until low tape sensor stopped it, tape started writing to reverse pass at start of the next scan. 0725 Readbacks okay. 0741 Readbacks okay. 0757 Readbacks okay. 0824 Readbacks okay. 0851 Readbacks okay. 0907 Readbacks okay. 0924 Readbacks okay. 0952 Readbacks okay. 1020 Readbacks okay. 1037 Readbacks okay. 1054 Readbacks okay. 1121 Readbacks okay. 1148 Readbacks okay. 1205 Readbacks okay. 1209 SC reports broken, low clouds. 1222 Readbacks okay. 1249 Readbacks okay. 1259 HN reports clear skies. 1316 Readbacks okay. 1330-1331 *FD tape head positioning error. Resent position REC 100 1 command. 1333 *BR bad readbacks on tracks 2-4, drive #2. Other sites okay. 1344-1345 *SC autostowed, commercial power glitch. Repointed. COM 100 1 1350 Readbacks okay. 1417-1418 *KP EL #2 armature over current fault, antenna not ACU 100 1 tracking properly. Disabled EL axis to clear error then re-enabled to resume pointing. 1418 Readbacks okay. 1446 Readbacks okay. 1450 New Op. D. Medcalf. 1456 LA wea: clear, dry. BR wea: high scattered clouds, dish is damp. 1533-1534 *SC FRM had rotation east motor foldback error. FRM 100 1 1535-1537 *LA had power glitch, antenna autostowed. COM 100 2 1548 All readbacks okay. 1604 All readbacks okay except OV1 tracks 10 and 19. 1613-1614 *PT focus had 2nd screw fault. FRM 100 1 1647-1650 *SC rotation motion analysis fault. FRM 100 3 1655 All readbacks okay. 1728 All readbacks okay except PT2 track 2. 1745 All readbacks okay. 1835 All readbacks okay. 1841 Webcam wea: SC, NL, FD, LA, PT partly cloudy, HN, KP clear, OV, BR, MK overcast. Possible light fog at BR. 1925 All readbacks okay. 1957 End at MK. 2030 End. Downtime Summary: Total downtime : 1131 min Percentage downtime of observing: 13.4% Average downtime per hour : 8.0 min Total scheduled observing time (# Antennas): 8440 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.