VERY LONG BASELINE ARRAY OBSERVING LOG -------------------------------------- Project: BG131D Observer: Gabuzda,D. Project type: VLBA Obs filename: bg131dcrd.* Date/Day: 2004DEC22/357 Ants Scheduled: SC HN NL FD LA PT KP OV BR MK =UT-Time===Comment===============================================MF#===%AD==AMD= Operator is Brian Willard. WEA: snow LA,PT. WEA: high winds NL,OV. WEA: snow on ground HN. GPS delta all less than 10 microseconds. Vclock values all within parameters. UT1-UTC = -0.50 at all sites. PT writing on MkV, VSN NRAO-040, Bank B. 0634 Begin observation, all antennae on source. 0634-0627 *SC subreflector is sporadically not locking in 15359 100 1433 ROTATION at commanded positions. While there will be some good data where the subreflector will be in position and locked, will count the antenna down 100% due to this problem. 0634-1617 *OV 4cm DEWAR warm and will not cool. 15417 25 145 0636 WEA: continued snow HN. 0642 New operator: T. Perreault 0704 Readback check ok 0729 *OV bad readbacks drive 1 all tracks except 2,19,23,27 all other sites ok 0751-0802 *KP loss of commercial power, antenna dropped COM 100 11 out of pointing. Repointed antenna. 0753 Readback check ok 0810 *PT wea: snowing 0841 MK readback check ok 0943 Readback check ok 1000 Readback check ok 1005-1008 *FD subreflector out of position in both FOCUS and FRM 100 3 ROTATION. At source change both the FOCUS and ROTATION commanded position went to 0. Did a MASTER CLEAR reset and re-read observing scan. 1018 Readback check ok 1106 Readback check ok 1122 Readback check ok 1209 %SC wea: raining 1213 MK readback check ok 1252 *FD wea: raining *LA wea: snowing 1259 SC wea: partly cloudy, scattered showers 1310 SC readback check ok 1324 Readback check ok 1332-1515 *NL multiple subreflector errors: FRM 100 103 Rotation 1st CCW limit Focus drive lockout Rotation drive lockout Unable to position subreflector in FOCUS or ROTATION Site tech should be there soon. When he arrives will have him inspect the FRM controller. 1357 Readback check ok 1359 FD wea: cloudy, rain turning to snow 1414 Readback check ok 1445 Operator du jour: Phillip Hicks and Sonja Mendoza. Snow/Rain at KP,PT,LA,FD, and HN. Rain at SC. 1455 KP wea: Clear and dry. 1517 *LA wea: Snowing, about 1" of snow on ground, 25% of dish covered with snow. 1521 Readback check ok. 1554 Readback check ok. 1600 %SC wea: Precipitation starting. 1606 OV wea: Overcast and dry. 1617-1626 *OV: Tech has requested antenna to work on 4cm dewar 15417 100 9 problem. Antenna out of point. 1626-0627 *OV 4cm dewar warm (but cooling). 15417 25 210 1626 Readback check ok. 1643 Readback check ok. 1715 Readback check ok. 1729 *PT wea: 6 inches of snow on ground, sky clear. State of the dish is as of yet unknown. 1732 Readback check ok. 1806 PT: Start writing on new disk pack NRAO-052 in bank A. 1907 SC only; readback test okay. 1938 *LA Bad readback for drive 2, ALL tracks! All other sites okay. 1956 Readback check ok. 2003 MK wea: Overcast sky, light wind. 2013 *LA Bad readbacks, drive 2, tracks 11,13,15,17,19,21,23,25,27,29,31,33 All other sites ok. 2045-2153 *LA Shutdown observing at LA due to bad readbacks 15418 100 68 on drive 2. Will check cabling and hopefully resume observing. 2052 Readback check ok. 2127 KP wea: High scattered clouds, dry. 2149 SC readback only, ok. 2153 LA: Start writing on new disk pack NRAO-050, bank A. Recorder techs have determined that drive #2 is not useable until repairs are made. 2228 Readback check ok. 2252 All readbacks OK. 2300 New operator is Brian Willard. 2339 All readbacks OK. 2355 WEA: clear dry OV. 0000 Date is 2004DEC23/358. 0003 All readbacks OK. 0029 WEA: scattered clouds NL. 0029 WEA: snow FD,LA,PT. 0030 WEA: scattered clouds KP,BR,MK. 0059 %MK: bad readback track 02, drive 2. All other readback tests OK. 0115 %NL: bad readbacks all tracks except 18,19, on drive 1. 0115 %MK: bad readback track 02, drive 2. 0115 All other readbacks OK. 0147 All readbacks OK. 0203 Holy readbacks, Batman! They're all OK! 0236 All readbacks OK. 0253 %MK: bad readbacks track 02, drive 2. 15419 All other readbacks OK. 0312 WEA: new snow FD. 0315 SC readback test, all good. 0323 All readbacks OK. 0343 All readbacks OK. 0359 SC readbacks, all OK. 0432 All readbacks OK. 0448 All readbacks OK. 0505 All readbacks OK. 0522 All readbacks OK. 0540 All readbacks OK. 0612 All readbacks OK. 0627 End. Downtime Summary: Total downtime : 1982 min Percentage downtime of observing: 13.8% Average downtime per hour : 8.3 min Total scheduled observing time (# Antennas): 14330 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.