VERY LONG BASELINE ARRAY OBSERVING LOG -------------------------------------- Project: BC120EH Observer: Chatterjee, S. Project type: VLBA Obs filename: bc120ehcrd.* Date/Day: 2004APR29/120 Ants Scheduled: SC HN NL FD LA PT KP OV BR MK =UT-Time===Comment===============================================MF#===%AD==AMD= 2323 Begin file at PT. Other stations join later VCLOCK check ok. SC at -0.118 UT1-UTC check ok GPS delta < 10 us Operator: T. Perreault 2323 PT running in MARK5 observing mode 2323 PT VLDIS is showing that drive 2 is the disc that is being used (NRAO-006), but tape is writing on drive 1 as well. 2334 Walter plugged the drive module into bank 1 and we immediately got a "doTape(): unknown action on drive 1 (Code: 3)" - Walter called said that this is ok - its a code he put in when a disk pack is mounted. 2338 PT recording on disk and tape (recorder 1). Have an error on recorder 1 - the head is at 27.5 microns and wants to be at 27.6 microns. Hopefully this is just an artifact. 2339 Begin file at all other sites 2339-0140 *LA TSMPLOTs show high system temperatures INT 25 30 on channels 7 & 8 (1683.99 MHz RCP(ch07)/LCP(ch08)) suspect RFI. 2340 FD site tech called, heading back out to the site 13895 the Ped Rm UPS is on inverter. He will go manually switch over to commercial power. 2345-0009 *LA autostowed. Wind gust in excess of 55 mph WEA 100 24 Autostowed again at 2350 just as it go on source. Will leave antenna out for a bit. 2345 PT Walter called, he will drop vacuum on recorder 1 until later in the observation when he wants to record data to tape. Recorder 2 also has no vacuum to ensure autoallocate won't switch over. 2358-0039 *FD not observing so site tech can work on the 13895 100 41 Ped Rm UPS. 0000 Date is 2004APR30/121. 0015-0034 *LA autostowed due to continued wind gusts WEA 100 19 in excess of 55 mph. Leaving it out for a bit again. 0040 %OV high winds at site. 0041-0140 *FD unclearable AZ #2 armature overcurrent error 13922 100 59 and MTR 1 AMPS are pulling in excess of 60 amps up to as high as 90 amps. Stowed antenna and will wait for site tech to return home. 0043-0108 *LA autostowed due to winds in excess of 55 mph WEA 100 25 leaving it out for a while again. Weather forecast are for winds to continue to be strong until after 8:00 PM MDT (0200 UT). 0052 FD called site tech, he will go back out to the site. 0113 PT writing on recorder 1. Head positioned ok. 0118 PT wea: light rain, overcast 0118-0140 *PT tape head is .3 microns off position: commanded SW 100 22 is 60.2, position is 59.9. Will not take a HEAD POSTION command. Walter is going to modify the observe file for tape only, reload and reboot. Tape footage is also off and I hope to be able to correct that after the reboot and before restarting observing. 0124 PT rebooting 0126 PT going to let the tape run back to beginning of tape so I can reset the supply, takeup, and feet counters. Will then go into TRKUSE and tell the system that track 2 is full. When I start recording it should then start up on track 3 and be ok. If the head continues to fail to move, will have to terminate and switch to recorder 2 and call up the oncall site tech. Removed PT from next observing to ensure that I have enough time to get the recorder set up. 0140 End. Downtime Summary: Total downtime : 220 min Percentage downtime of observing: 16.1% Average downtime per hour : 9.6 min Total scheduled observing time (# Antennas): 1370 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.