VERY LONG BASELINE ARRAY OBSERVING LOG -------------------------------------- Project: BW069N Observer: Wiik, K. Project type: VLBA Obs filename: bw069ncrd.* Date/Day: 2005APR29/119 Ants Scheduled: SC HN NL FD LA PT KP OV BR MK =UT-Time===Comment===============================================MF#===%AD==AMD= 1441 Begin file VCLOCK check ok. BR at -0.209 UT1-UTC check ok (-0.60) GPS delta < 10 us Operator: T. Perreault FD recording Mark V bank A pack NRAO-069 LA recording Mark V bank B pack NRAO-030 PT recording Mark V bank B pack NRAO-027 KP recording Mark V bank A pack NRAO-010 1441-1627 *BR data recorded on drive 1 is no good. 16021 100 106 Drive accidentally cabled to formatter board set 2. 1446 KP wea: low overcast, fog, no precipitation 1452-2344 *SC 7mm DEWAR is slightly warm. CRYO 10 53 1452-1458 *BR subreflector out of position in ROTATION 16020 100 6 at 1cm. At source change to 2cm subreflector did not move. Had to do a MASTER CLEAR reset and re- read observing scan. 1504 OV wea: clear, no precipitation 1557 KP recording Mark V bank B pack NRAO-019 1558-1604 *BR rotation brake not engaging at 1cm position 16020 100 6 allowing subreflector to drift. 1615 Readback check ok 1627-1720 *BR Shut down observing for tape tech to check 16021 100 53 tape drive problems. 1654 SC readback check ok 1711 KP wea: broken low clouds, no precipitation 1715 Readback check ok 1720-2344 *BR rotation brake intermittantly not engaging at 16020 8 30 1cm position allowing subreflector to drift in rotation. Downtime is estimated. Also seeing sproadically @ 4cm position. 1751 Readback check ok 1805-1808 *KP autostowed. Power glitch. Repointed. COM 100 3 1840-1848 *SC not observing. Site tech is on antenna to CRYO 100 8 turn 7mm DEWAR to manual from computer. After observing he will start the 7mm to pump for replacement later. 1852 SC, HN readback check ok 1859 PT wea: raining 1930 SC, HN readback check ok 1953 Readback check ok 2033 SC, HN readback check ok 2055 Readback check ok 2102 LA recording Mark V bank A pack NRAO-031 2102 %LA disc pack in bank B went to mode ERASE! after it switched over. Contacted Walter Brisken who had me toggle the Mark V offline then online. Pack in Bank A now thinks it's full with 2.1% written. 2127-2148 *LA rebooted VME per Walter's direction SW 100 21 in an attempt to clear up the Mark V confusion. 2134 Readback check ok 2140 New operator is Jim Ogle. 2141 *LA Mk5 disc pack appears to be bad, new packs being loaded. 2146-2152 *SC rotation motor overspeed fault. 15359 100 6 2155-2159 *SC rotation motor overspeed fault. 15359 100 4 2156 Readbacks okay. 2214-2219 *SC rotation motor overspeed fault. 15359 100 5 2224-2226 *SC rotation motor overspeed fault. 15359 100 2 2230-2231 *SC rotation very slow getting on position. 15359 100 1 2231 Readbacks okay. 2257 OV reports cloudy skies. 2328 PT now writing on Mk5 disc pack NRAO-038 in bank A. 2344 End. Downtime Summary: Total downtime : 304 min Percentage downtime of observing: 5.6% Average downtime per hour : 3.4 min Total scheduled observing time (# Antennas): 5430 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.