[evlatests] AR642 30jun07: ok for 17mins, dead for remaining 40mins

[Michael Rupen]

AR642  30jun07  02:42-03:40
  dynamic run, fast-switching, continuum, C-band, 3.3s averaging

Summary: looks ok for 1st 17 mins (a couple bad flags), then no fringes
   for the remaining 40 mins, including one long non-fast-switching scan on
   3C286.  2/3 USELESS FOR SCIENCE.

Details:

* No notations in te log, apart from the usual, and no C-band receivers
   on 19 and 21.

* Lovely data 02:46-03:00; then no fringes on any baseline 03:00-03:40 (end
   of run)
   - I suspect the antennas sat on the (very faint) target source for the
     rest of the run

* The first record on a source (non-calibrator) sub-scan is not flagged, at
   02:55:30.
   - This record also represents the first time ant. 21 is [incorrectly] not
     flagged, and is just before the last "good" subscan on a calibrator.

* The "no fringe" section ends with one long "regular" [not fast-switching]
   scan on 1331+305.
   - All the EVLA antennas are flagged for the 1st 3 minutes of this scan.
     Whether this is accurate is impossible to say without fringes.

* Ant. 19 give no fringes throughout
     - accurately caught by on-line flags

   Ant. 17 gives no fringes in 2nd cal. scan
     - accurately caught by on-line flags

   Ant. 2,7,28 arrive late on 2nd cal. scan (13 sec later than the rest)
     - this is not caught by on-line flagging

   EVLA ant. 21 is nonsense throughout, but is only flagged for
     02:43-02:55
     02:57-03:00

* Much of ant. 16 is flagged, but the fringes look fine


-- Michael