VERY LONG BASELINE ARRAY OBSERVING LOG -------------------------------------- Project: GM052A Observer: Mantovani, F. Project type: VLBI Obs filename: gm052acrd.* Date/Day: 2004FEB13/044 Ants Scheduled: SC HN NL FD LA PT KP OV BR MK Y EB =UT-Time===Comment===============================================MF#===%AD==AMD= 0719 Begin file at SC. Other sites join later. VCLOCK check ok. SC at -0.132 (ping 0.522 seconds) UT1-UTC check ok GPS delta < 10 us Operator: T. Perreault 0719-1612 %SC 4cm reciever warming, Cryo compressor A has 13424 50 266 shut down following a power glitch. Both site techs have been called and messages left on their cell phone voicemail. System temperatures are high but not flagging yet. 0743 SC readback check ok 0802 %SC wea: raining 0807 HN, NL, FD, LA, PT join 0807 %PT elevated system temperatures; site tech WEA reported 1" of snow on ground when he left site, so there undoubtedly some snow in dish. Overnight weather forecast for PT is for a possible 2 - 4" of snow. 0831 *FD bad readback drive 1 (tape: HST00244) tracks 8,9; 13425 all other sites ok. 0833 Y,KP,OV,BR join 0839 *FD bad readback drive 1 (tape: HST00244) track 8; 13425 all other sites ok. 0901 *FD bad readback drive 1 (tape: HST00244) track 8; 13425 all other sites ok. 0925 *FD bad readback drive 1 (tape: HST00244) tracks 8,9; 13425 all other sites ok. 0949 *FD bad readback drive 1 (tape: HST00244) track 8; 13425 all other sites ok. 1013 *FD bad readback drive 1 (tape: HST00244) tracks 8,9; 13425 all other sites ok. 1013 &SC site tech Greg Worrell called, he will be onsite 13424 in about 15 minutes and will restart the cryo compressor. 1030 &SC tech Greg onsite 1037 *FD bad readback drive 1 (tape: HST00244) track 8; 13425 all other sites ok. 1039 MK joins 1045 *FD bad readback drive 1 (tape: HST00244) tracks 8,9; 13425 all other sites ok 1107 *FD bad readback drive 1 (tape: HST00244) tracks 8,9; 13425 all other sites ok 1120 &SC site tech Greg called. He has the cryo compressor running but the receivers aren't cooling down. He is going to try to contact Pete Allen (other site tech). 1131 *FD bad readback drive 1 (tape: HST00244) track 13; all other sites ok 1219 Readback check ok 1227 Readback check ok 1328 Readback check ok 1416 Readback check ok 1421 FD wea: freezing fog, ground and dish iced over 1439 *LA bad readback drive 2 (tape: VLBA0178) tracks 31, 33; all other sites okay. 1441 New operator is Jim Ogle. 1442 KP reports clear skies. 1452 %BR reports fog, icy conditions. 1459 LA reports clear skies. 1503 Readbacks okay. 1523 End at SC and HN. 1531 *LA bad readbacks on tracks 31 and 33. Other sites okay. 1557 *FD bad readbacks on track 31, drive #2 (tape EVNT0721). Other sites okay. 1612 FD 4cm receiver has cooled down to normal operating temperatures. 1621 *LA bad readbacks on tracks 31 and 33. Other sites okay. 1645 Readbacks okay. 1708 End at NL. 1715 Readbacks okay. 1735 Readbacks okay. 1822 End. Downtime Summary: Total downtime : 266 min Percentage downtime of observing: 3.6% Average downtime per hour : 2.2 min Total scheduled observing time (# Antennas): 7293 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.