[evlatests] The Weekend Report: EVLA behavior 11-13aug06

[Michael Rupen]

The Weekend Report:
   11aug06 23:21-23:50 IAT (AR603 dynamic, C band)
   12aug06 16:17-17:47 IAT (S7998 regularly scheduled, X band)
   13aug06 23:42-00:42 IAT (AR603 dynamic, C band)
M. Rupen 14aug06

Preliminary report

All runs standard continuum, 3.3s averaging, mostly fast switching

11aug06: C band, EVLA ant. 13,14,16 included
   -- good fringes on all except no data from ant. 13 IF B (2R)

12aug06: X band, EVLA ant. 13,14,16,18,24 included
   -- good fringes on 13,14,16 throughout
   -- ant. 18: good fringes on IF A (1R)
               fringing but low amp. and quite noisy phases on IF B,C,D
                 (2R, 1L, 2L)
   -- ant. 24: IFs AB no data (1R, 2R); IFs CD look fine throughout

13aug06: C band, EVLA ant. 13,14,16 included
   -- good fringes throughout (incl. 13 IF B), but the first minute or so
     of each of the two scans showed no fringes [low amp., random phase] on
     all EVLA-VLA and  EVLA-EVLA baselines.  One scan was fast switching, the
     other was standard [3C286].  All EVLA antennas started fringing at the
     same time, which seems to rule out, e.g., a slow slew to the new source.
     The rest of the 20-min. fast-switching scan was fine -- the EVLA antennas
     started delivering good calibrator fringes at the same time as the
     "standard" VLA antennas.

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