[evlatests] Current EVLA Behavior

[Rick Perley]

    The standard all-band stress test was applied for lunch.  Everything 
is working normally now at all bands.  A few issues were noted:

    Global Issues:

    1) 18C was behaving erratically.  Apparently a DTS issue, which is 
said to have been repaired already!

    2) The incorrect setup for any band which follows a P-band or a 
U-band observation remains.  In this test, the P-band observation was 
followed by a pair of L-band observations.  On average, 10 antenna-IFs 
were flagged bad on the first observation of the pair, but not on the 
second.  That's a 5% error rate (2pair * 4 IFs * 25 antennas).  The same 
error fraction was seen for the first K-band observation, which followed 
U-band. 
       This is an unacceptably high loss (IMHO), and I encourage those 
who understand how commands are send and executed to address this issue.
    Until the problem is repaired, I think it prudent to inform users to 
insert a 'dummy' scan whenever they depart from P or U band observation. 

    Band Specific Items.

    1) P-Band.  23B is low in sensitivity by a factor of over 40.  This 
needs to be written up.  19B is low by a factor of 5.  All others 
(except 1, 13, and 16, which are not yet operational) have near normal 
sensitivity.

    2) L-Band.  21A and 21B (RCP) are low in sensitivity by a factor of 2.

    3) C, X, and U Bands.  All are normal. 

    4) K-Band.  Antenna 25, all IFs, low in sensitivity by a factor of 6. 

    5) Q-band.  All normal -- including antenna 1, which got its Q-band 
receiver operational yesterday.