[evlatests] EVLA -- or VLA -- phase jumps with no change in Flukes, on IFs A and C.

[Rick Perley]

    I've run a few of my stress tests in the past 3 days, looking for 
new problems.  (These are getting harder to find!) 

    However, one new effect occurs consistently, and is perhaps new.   
In the past, my 'stress test' ran through each band in sequence, with no 
repetitions.  But because there have been problems with the first scan, 
wherein the VLA antennas don't fringe, I've modified the test to repeat 
the first scan in the file, before moving ahead through the sequence. 

    In each of the 3 or so tests I've tried this, I have noted that the 
phase of the EVLA antennas -- *** in IFs A and C only*  changes between 
the scans, by about 30 degrees.  The change is the same on all antennas, 
and also on both IFs (hence, both polarizations).  There is no change in 
Flukes, or frequency, between these scans. 

    Of course (and as always), I cannot tell if it's the EVLA which 
changed, or the VLA.  In the analysis, I used a VLA antenna as reference.