VERY LONG BASELINE ARRAY OBSERVING LOG -------------------------------------- Project: BW082C Observer: Walker, R. C. Project type: VLBA Obs filename: bw082ccrd.* Date/Day: 2006APR14/104 Ants Scheduled: SC HN NL FD LA PT KP OV BR MK =UT-Time===Comment===============================================MF#===%AD==AMD= Operator is Sonja Mendoza. SC writing to Mk5 disk NRAO-125, bank A. HN writing to Mk5 disk NRAO-038, bank A. NL writing to Mk5 disk NRAO-155, bank B. LA writing to Mk5 disk NRAO-142, bank A. PT writing to Mk5 disk VIPSU-05, bank B. KP writing to Mk5 disk NRAO-136, bank B. OV writing to Mk5 disk NRAO-037, bank A. BR writing to Mk5 disk NRAO-138, bank B. MK writing to Mk5 disk NRAO-053, bank B. Vclock, GPS delta and UT1-UTC time checks all ok. SC WEA: Weather seems to be improving after earlier rains. HN WEA: Mostly clear skies, dry. *NL WEA: Severe thunderstorms, county under tornado warning, tornado indicated on radar only a few miles to the SE of the NL site. Heavy rain. LA WEA: Partly cloudy skies, dry. KP,PT WEA: Mostly overcast skies, dry. %OV WEA: Very gusty winds, some gusts > 35mph. %BR WEA: Mostly overcast skies, dry. MK WEA: Mostly clear skies, some high thin cirrus. Gusty winds, dry. 0113 Begin observation. 0113-1111 *FD Antenna has antenna wrap problems (cables 18011 100 598 are being pulled loose). Removed from observing. 0113-0246 *NL WEA: Severe supercell thunderstorms; lighting, WEA 100 93 hail, tornados in vicinity. Heavy rain. Site tech who lives less than two miles from site keeping VLBA operator apprised of the weather conditions. Site removed from observing until weather improves. 0113-1111 *BR CRYO: 7mm dewar warming; 15K stage at 63K. 18022 100 598 0113-1111 &BR Have contacted the site tech, who feels the 18022 unit is going into a cold trap (may have contamination in the lines). Unit should start cooling back down on it's own. 0137-1111 *SC EL #2 armature over current; attempting to 18021 100 574 clear. 0138 &SC Unable to clear over current; most likely 18021 caused by blown fuses; contacting site tech. 0142 SC Site tech enroute to antenna. 0218 BR writing to Mk5 disk NRAO-147, bank A. 0231 SC WEA: Site tech reports scattered, high clouds, wet. 0245 %NL WEA: Tornado warning has expired, rain is slowing. Radar indicates that severe weather has mostly moved to the east of NL site; Repointed. 0325 *SC Site tech could not find a blown fuse; 18021 consulted with P. Rhodes, attempted to swap motor controllor boards but this also did not fix problem. Will have to be addressed in the morning. 0329 HN writing to Mk5 disk NRAO-028, bank B. 0337 *SC Antenna removed from observing. 18021 0405-0406 *OV AZ #1 armature overcurrent. Cleared. ACU 100 1 0545 New operator is Brian Willard. 0734 BR 7mm cryo now completely warm. 0821 %BR: Tsys downright lousy. 1023 %HN: high Tsys due to low elevation. 1111 End. Downtime Summary: Total downtime : 1864 min Percentage downtime of observing: 31.2% Average downtime per hour : 18.7 min Total scheduled observing time (# Antennas): 5980 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.