VERY LONG BASELINE ARRAY OBSERVING LOG -------------------------------------- Project: BH118C Observer: Hough, D.H. Project type: VLBA Obs filename: bh118ccrd.* Date/Day: 2004APR24/115 Ants Scheduled: SC HN NL FD LA PT KP OV BR MK Y =UT-Time===Comment===============================================MF#===%AD==AMD= Operator is Cyrus M Reed. VCLOCK and GPS DELTA OK. UT1-UTC OK (-0.45). WEA: Cloud cover via webcam: WEA: SC,HN Unknown (night). WEA: NL,KP,BR Altocumulus. (10%,5%,25%) WEA: FD,OV Clear skies. WEA: LA,PT Cumulus. (95%,90%) WEA: MK Low status/fog. (100%) WEA: Wet/rain at LA,MK - other sites dry. 0015 Begin observing. All antennas on source. 0025 *OV bad readbacks: Drive 1, Tracks 02-08,11-13, 13882 16-18,20-25,27-29,31-33. *LA bad readback: Drive 2, Track 33. All other readbacks OK. %Talked to site tech earlier about bad readbacks on OV Drive 1 - he thought it may be due to the fact the tape didn't have time to acclimate to the building temperature for the usual 24hrs - tape only arrived on site today. 0055 *OV bad readbacks: Drive 1, Tracks 03-05,07,08, 13882 11-13,15-17,19-21,23,24,27-29,31-33. All other readbacks OK. 0125 *OV bad readbacks: Drive 1, Tracks 03-05,07,08, 13882 11-13,15-17,19-21,23-25,27-29,31-33. All other readbacks OK. 0152 *OV bad readbacks: Drive 1, Tracks 03-05,07,08, 13882 11-13,15-17,20,21,24,27,28,31-33. All other readbacks OK. 0225 *OV bad readbacks: Drive 1, Tracks 03,04,07,08,16, 13882 20,24,29,32,33. All other readbacks OK. 0252 *OV bad readbacks: Drive 1, Tracks 03,04,07,08,12, 13882 16,20,31-33. All other readbacks OK. 0258 *OV bad readbacks: Drive 1, Tracks 03,04,07,08,12, 13882 13,16,28,29,32. All other readbacks OK. 0328 *OV bad readbacks: Drive 1, Tracks 03,04,07,08,12, 13882 16,17,24,29,32. *PT bad readbacks: Drive 2, Tracks 26,28. All other readbacks OK. 0354 *OV bad readbacks: Drive 1, Tracks 03-05,07,08,12, 13882 16,17,20,23,24,28,29,31-33. 0356 &Called OV site tech about bad readbacks - going to 13882 swap recording to Drive 2, and see if bad readbacks still occur with a different tape on Drive 1. Jim is heading out to site to put up a new tape on Drive 1. The problem may be tape related, or a drive problem - it should be evident when recording swaps back to Drive 1 at appx. 1500UT tomorrow morning. 0424 All readbacks OK. 0446 All readbacks OK. 0454 All readbacks OK. 0502 All readbacks OK. 0529 *LA bad readback: Drive 2, Track 33. All other readbacks OK. 0535 New operator: T. Perreault 0554 *LA bad readback drive 2 track 33; all other sites ok 0600-0700 All readbacks this past hour ok at all sites. 0700-0800 All readbacks this past hour ok at all sites. 0800-0900 All readbacks this past hour ok at all sites. 0900-1000 All readbacks this past hour ok at all sites. 1001 Readback check ok 1031 *HN bad readback drive 1 tracks 2,4; 13886 all other sites ok 1059 *HN bad readback drive 1 tracks 2,4; 13886 all other sites ok 1100-1200 All readbacks this past hour ok at all sites 1141 %MK loss Internet comm with site, went on dial NET backup. 1201 *HN bad readback drive 1 tracks 2,4,5,6,8,10,12,14, 13886 16,18,20,22,24,26,28,30,32; all other sites ok 1228 *HN bad readbacks drive 1 tracks 2,4,6,8; 13886 all other sites ok 1258 *HN bad readbacks drive 1 tracks 2,4; 13886 all other sites ok 1324 PT site tech called, wanted to know how many passes were available. 1331 Readback check ok 1344 New operator is Jim Ogle. 1400 %HN bad readbacks on all tracks; appeared to be at the end of a pass so it may not have been able to do the full test. Other sites okay. 1427 *HN bad readbacks on tracks 2 and 4. Other sites 13886 okay. 1452 Readbacks okay. 1511 Readbacks okay. 1525 *HN bad readbacks on almost every track. Other 13886 sites okay. 1529 BR reports high thin scattered clouds. 1548 *HN bad readbacks on most tracks. Problem appears to 13886 only occur on forward passes. *OV drive #1 bad readbacks on tracks 3, 4, 7, 8, 12, 13882 16, 17, 20, 23, 24, 30-33. Other sites okay. 1606 *OV bad readbacks on tracks 3, 4, 7, 8, 12, 16, 20, 13882 29, 31-33. OV does not have enough tapes on hand that we can afford to abandon the rest of this tape to avoid the readback problem by switching to the other drive. Other sites okay. 1650 LA reports scattered low clouds. 1658 *HN bad readbacks, almost all tracks. 13886 *OV bad readbacks on many tracks. 13882 Other sites okay. 1728 *HN bad readbacks, almost all tracks. 13886 *OV bad readbacks on many tracks. 13882 Other sites okay. 1734 HN reports clear skies. 1758 *OV bad readbacks on many tracks. 13882 Other sites okay. 1806 SC reports clear skies. 1815-0018 *BR EL #1 armature over current fault. The usual 13888 100 363 corrections are not getting rid of the error so it is probably a blown fuse. 1820 &BR tech called out. 13888 1827 *OV bad readbacks on many tracks. 13882 Other sites okay. 1857 *OV bad readbacks only on 3, 4, 8 and 32. 13882 Other sites okay. 1901 *BR tech reports problem is not as simple as a 13888 blown fuse, may be something more serious. He's continuing to investigate. 1903 MK reports clear skies. 1917 *BR tech reports the problem is mechanical and will 13888 involve taking apart one of the elevation brakes. Since this is projected to take at least an hour, maybe more, I'm going to shut down the observation at BR for the time being. 1933 KP reports clear skies. 1929 *OV bad readbacks on many tracks. Other sites okay. 13882 1958 *OV bad readbacks on many tracks. Other sites okay. 13882 2007 %Y operator called to report that they are having to switch to a different antenna due to problems with the one currently in use. Not sure if or how that may affect correlation of the data. 2028 *OV bad readbacks on many tracks. Other sites okay. 13882 2058 *OV bad readbacks on more tracks than usual. 13882 Other sites okay. 2059 *Raining at NL. 2128 *OV bad readbacks on more tracks than usual. 13882 Other sites okay. 2226 *OV bad readbacks on more tracks than usual. 13882 Other sites okay. 2259 *OV bad readbacks on more tracks than usual. 13882 Other sites okay. 2328 OV bad readbacks on many tracks. Other sites okay. 13882 2332 *Raining at MK. 2358 *OV bad readbacks on many tracks. Other sites okay. 13882 0000 Date is 2004APR25/116. 0018 End. Downtime Summary: Total downtime : 363 min Percentage downtime of observing: 2.3% Average downtime per hour : 1.4 min Total scheduled observing time (# Antennas): 15873 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.