[evlatests] VLA baselines. IFA strange.

[Ray Ferraro]

	There were some strange results coming out of Ant. 10, DCS 15, IFA 
early this morning, 10/24/06. The VLA operator swapped the sampler with 
a spare around 6 am MDT. This may have fixed the problem. See work order 
C119264. However, the symptoms described, SxS = -.779 for IFA on the 
baseband overlay, are not typical of a sampler failure. We will have to 
keep an eye on it. Thanks.
		Ray


Vivek Dhawan wrote:
> Early this morning a baselines run was done (we really
> wanted an X-band pointing run, got this instead.) This
> message is to report briefly on the VLA antennas alone.
> 
> EVLA antennas 13,14,16,18,24,26 all produced some data,
> I'll report on that separately.
> 
> VLA # 2, 7, 20 and 27 needed some position adjustment.
> Meri has the numbers, I assume there is a standard
> procedure for installing these changes.
> 
> One curiosity was noted - some antennas, especially 10,
> had very poor performance on IF A (B, C, D were OK).
> Phases were very jumpy with 2 or more states. These
> errors did not close - i.e. the pattern looked different
> on different baselines to 10. Smells like correlator,
> but I checked with Gustaaf, who took some data a couple
> hours later, and he sees nothing wrong with ant 10.
> Does anyone have a clue? should I waste more time on
> chasing it down?
> 
> The time was Oct 24, UT 09:00 to 12:30, things
> seemed to improve dramatically thereafter, till the
> end at 14:30.
> 
> Vivek.
> _______________________________________________
> evlatests mailing list
> evlatests at listmgr.cv.nrao.edu
> http://listmgr.cv.nrao.edu/mailman/listinfo/evlatests
>