[evlatests] AM889 on July 30

[Ed Fomalont]

AM889 on July 30

OBSERVATION IS FAIR.  NO NEED TO REDO

STRANGE THINGS HAPPENED FOR A 45-min PERIOD.  NOTES IN LOG, BUT
 MANY ANTENNAS DROPPED OUT.  SEE END OF NOTE.

1.4 GHz, 2 IFs, 2 Pols usual deep field correlator setup,
4 hour experiment, 3.3sec integration

antennas:
    18, 25 out; 11 bad and must be flagged, 18 sometimes
    25 antennas working, 2 IFs, 2 Pols

    quack needed again for first three hours
    First scan is still ropey
    Last 20 sec of final observation needs flagging

About 30 min of bad interference in IF 1 RR, LL.  Only a few spikes in IF2

Images are okay, believe it or not.


SOME PROBLEMS NOTED IN LOG:  COMMENTS IN CAPS

0Jul 12:15:00
Note: According to ANTSOL display antennas 17, 19 and 21 are showing
zero amplitudes.

    YES. THESE WERE FLAGGED

30Jul 13:02:00
ANTSOL now shows antennas 17 and 21 with reasonable amplitudes but
now antennas 8, 16 and 26 are showing zero amplitudes.

    YES, THESE WERE FLAGGED


30Jul 13:28:00        30Jul 14:45:00         C120948   1.00      77.0
Antenna(s) 27  (Data: Lost):                                     CRYOGENICS
Antenna parked to allow CRYO tech's to change out Compressor B.

30Jul 13:30:33        30Jul 14:31:40         C120949   24.00     1466.8
Antenna(s) All antennas  (Data: Unknown Effect):                 OTHER
Data is flagged on D10 for antennas 10 and 12 as well as 6 and 8. Assuming
all antennas are flagged. Hard to check to to problems with Miranda. Not 
sure
why this is happening. James Robnett is taking a look at the Miranda 
computer.


   STARTING AT 13:18:08 FOLLOWING ANTENNAS WERE FLAGGED

EVLA ANTENNAS FLAGGED 13:18:08 to 13:30

   THEN during problem with Miranda,
13:30 to 14:00:  data only from ante 1 3 4 7 10 14 15 16 21 23 passed, 
but could
  be bad.  No calibrator observation in this period.