[evlatests] IF1 - IF2 phase jumps

[Rick Perley]

    A few more top-level observations on this problem.

    There is a major phase problem between VLA and EVLA for this run.  
When referenced to a VLA antenna, the EVLA phases are 'all over the 
place'.  But when referenced to an EVLA antenna, they look normal, 
within the bounds expected by weather effects. 

    There is no IF1 - IF2 phase difference problem between the EVLA 
antennas -- other than for antenna 14, which is bad because 14BD has the 
old firmware. 

    There are many IF1 - IF2 phase differences, at all three bands, 
amongst the VLA antennas.   These jumps are both 'up' and 'down', and 
have different values between the bands, and within a single band.  
Antennas 6 and 12 have characteristics rather different than the others, 
-- the also jump much more frequently. 

    I'm quite sure I would have noticed these effects in my tests taken 
prior to my Australian trip (left in mid-Sept.) -- whatever is doing 
this was I think triggered by events since about mid-Sept.