[evlatests] VLA-VLA phase jumps

[Rick Perley]

    It's all very confusing ...

    Gustaaf, Mark, and I loaded most of the data taken over the past 
week, and looked at the calibrator phase behavior.  In general, it is 
clear that the very bad phase behavior seen by me in the two test runs 
last week (Wednesday and Thursday mornings) are not seen in any of the 
runs over the past week.  I therefore believe there is no reason to 
extend the current configuration to re-observe any of these projects. 

    However, it is also clear that some of these runs are not completely 
free of the effects noted.  Michael (using a convenient option in SNPLT 
that I was unaware of:  'OPCOD = IFDF') has clearly shown isolated 
incidents of R1-R2, or L1-L2 phase jumps similar to the spectacular 
examples that caught my eye last week. 

    During the remainder of maintenance time, when the array is not 
being used for more important things, I will repeat the file which so 
spectacularly caused the bad behavior noted last week.