************************************************************************ Program: AH753 Subarray(s): #1 Observer(s): Hunter Operator(s): Greg Patterson & Sonja Mendoza Date: Friday, Oct 19 2001 Configuration: D User Number: 667 Decommissioned: 15 Source File(s): 915H753 VLBI Ref. Ant: Observing Mode: Line, mode=2AC VLB Antenna Pad: ** Weather Information ** Time Dew Point Temp. Wind Bar. Pressure 01Oct19 01:20:31 -10.7C 16C NW at 6.1 m/s 792.2mbars 01Oct19 02:30:33 -9.9C 15.4C W at 3.8 m/s 792.9mbars 01Oct19 05:55:38 -9.6C 10.9C w at 2.5m/s 793.7mbars 01Oct19 09:05:55 -11.3C 3.3C w at 2 m/s 793.7mbars Remarks: Operator comments for the above weather entries. The sky is clear. The sky is clear. The sky is clear. The sky is clear. ** Visibility Tape Information ** Tape # File # Time of Final Record: N15290 1 01Oct19 at 2:02:45 N15291 1 01Oct19 at 4:38:25 N15292 1 01Oct19 at 7:14:05 N15293 1 ** Monitor Tape Information ** Tape # File # Time of Final Record: N15280 4 Antenna(s) Used: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 16 17 18 19 20 21 22 23 24 25 26 27 28 ** Operator Comments ** 01Oct19 01:20:41 Starting program: AH753, observe file: 915H753. 01Oct19 01:21:05 On source 0137+33110 with all available antennas. The band(s) used is(are) L band(s). 01Oct19 01:20:41 The on-line baseline parameters for antenna(s) 1 5 18 25 27 have recently been updated (prior to your observing run) to correct for errors resulting from their recent relocations. In the analysis of your data would you please check for any significant baseline errors especially on these antennas and let the Data Analysts (email - analysts@nrao.edu) know what you find when there are significant baseline errors. Thank you in advance. 01Oct19 01:20:41 Shadowing is occurring! Some antennas are blocking the view of your radio source from other antennas. You may have to edit your data. Observing Data: Corrupted. 01Oct19 01:23:00 Atmospheric Phase Interferometer Data: Saturation Phase = 5.1 degrees. Corner Time = 20.8 seconds. For information on the on-line Atmospheric Phase Interferometer, see http://www.aoc.nrao.edu/vla/html/PhaseMonitor/phasemon.html for details. 01Oct19 01:20:41 - 01Oct19 09:19:39 Form #: C106502 # of Ants: 0.90 Downtime: 431.07 Antenna(s) 9 - LOCAL OSC (Local Oscillator) Problem(s); Antenna L5 5MHz phase > 0.3V Observing Data: Unknown Effect 01Oct19 02:13:00 Atmospheric Phase Interferometer Data: Saturation Phase = 4.3 degrees. Corner Time = 30.1 seconds. 01Oct19 03:00:00 Atmospheric Phase Interferometer Data: Saturation Phase = 3.4 degrees. Corner Time = 14.5 seconds. 01Oct19 03:05:46 Antenna 13 - VLA CORREL (VLA Correlator Hardware) Problem(s); An integrator card was exchanged and unexchanged for DCS #10 QUAD/IF 2 at this time by the Correlator self-test system. This occurs when the data leaving the tested integrator does not match the data from another test/integrator pathway. There is no data loss during these exchanges however, it is unclear whether data for this antenna from the initial exchange cycle until the unexchange cycle was good or bad. Each DCS number is tested every 0.8 seconds. Please check your data for this antenna prior to the unexchange. Observing Data: Unknown effect. 01Oct19 04:28:00 Atmospheric Phase Interferometer Data: Saturation Phase = 3.6 degrees. Corner Time = 38.2 seconds. 01Oct19 05:06:00 Atmospheric Phase Interferometer Data: Saturation Phase = 4.2 degrees. Corner Time = 49.3 seconds. 01Oct19 05:55:38 **** Jim Nieri is your operator. **** 01Oct19 05:56:45 Ran a backup on the Modcomp partition where observe files are kept. 01Oct19 06:49:00 Atmospheric Phase Interferometer Data: Saturation Phase = 2.1 degrees. Corner Time = 31.0 seconds. 01Oct19 08:07:26 Shadowing is occurring! Some antennas are blocking the view of your radio source from other antennas. You may have to edit your data. Observing Data: Corrupted. The Shadowing has been occurring since the beginning of the file. 01Oct19 08:11:00 - 01Oct19 08:13:00 Form #: Other # of Ants: 1.00 Downtime: 2.00 Antenna(s) 2 - SERVO (Antenna ACU, Encoders, Translators) Problem(s); The anTenna was oscillating in azimuth by more than 1 deg. The antenna was parked to recover. Observing Data: Lost 01Oct19 08:45:00 Atmospheric Phase Interferometer Data: Saturation Phase = 5.5 degrees. Corner Time = 85.8 seconds. 01Oct19 09:19:39 End of program AH753. Total Downtime = 433.1 minutes (3.3% of total time).