VERY LONG BASELINE ARRAY OBSERVING LOG -------------------------------------- Project: GM052B Observer: Mantovani, F. Project type: VLBI Obs filename: gm052bcrd.* Date/Day: 2004FEB14/045 Ants Scheduled: SC HN NL FD LA PT KP OV BR MK Y EB =UT-Time===Comment===============================================MF#===%AD==AMD= 0715 Begin file. VCLOCK check ok. SC at -0.127 UT1-UTC check ok GPS delta < 10 us Operator: T. Perreault 0739 SC readback check ok 0803 HN, NL, FD, LA, PT join 0803 SC readback check ok 0827 Y,KP,OV,BR join 0827 Readback check ok 0833 Readback check ok 0853 Readback check ok 0917 Readback check ok 0941 Readback check ok 1005 Readback check ok 1029 MK joins 1029 Readback check ok 1035 Readback check ok 1055 Readback check ok 1119 Readback check ok 1143 Readback check ok 1207 Readback check ok 1231 Readback check ok 1320 Readback check ok 1345 Readback check ok 1409 *OV bad readback drive 2 (tape: VLBA1260) track 33; 13428 all other sites ok 1430 Site weather (via webcam): SC: partly cloudy HN, NL, FD, LA, PT, KP, OV: clear 1433 *OV bad readback drive 2 (tape: VLBA1260) track 33; 13428 all other sites ok 1435 New operator is Jim Ogle. 1438 Readbacks okay. 1443 %Snowing at BR. 1455 SC reports clear skies. 1458 *OV bad readbacks on track 33. Other sites okay. 13428 1459-1500 *BR tape lost vacuum, probably caused by a problem REC 100 1 with the readback test being done at the start of the reel. Reloaded tape and restarted scan. 1500-1521 %BR tape is about 1000 feet out of position due to REC 100 21 the vacuum loss; will correct by fast-forwarding at end of this pass so tape is at end of reel as scheduled (though this will disrupt the readback test done at that time.) 1521 End at SC and HN. 1522 Readbacks okay (except BR, which was interrupted to get tape repositioned correctly.) 1546 Readbacks okay. 1610 *OV bad readbacks on track 33. Other sites okay. 13428 1633 End at NL. 1637 %High wind gusts at FD. 1640-1641 *PT autostowed, commercial power glitch. Repointed. COM 100 1 1640 *OV bad readbacks on track 33. Other sites okay. 13428 1700 Readbacks okay. 1704-1708 *PT not tracking source in elevation, it's bouncing ACU 100 4 around about 20 arcseconds to 1 degree off position. Finally got on position and is tracking properly. 1714-1716 *PT wandering off source in elevation again. ACU 100 2 I briefly disabled the EL axis then re-enabled it and it went on position. 1724 Readbacks okay. 1748 Readbacks okay. 1811 End. Downtime Summary: Total downtime : 29 min Percentage downtime of observing: 0.4% Average downtime per hour : 0.2 min Total scheduled observing time (# Antennas): 7216 min (11) 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.