[evlatests] Thursday afternoon phase status

[Rick Perley]

    I ran two test file at the end of software time:

    1) The multi-frequency file used to test polarization.  This one 
cycles around P, L, C, X, and K bands, one minute per band, alternating 
between 3C286 and 287.  In my previous observations with this system, 
the A/C phases changed upon change of band, (upon returning to the same 
band) while the B/D did not.  This occurred for all bands. 

    2) The standard stress test, which begins with three consecutive 
L-band observations.   In previous observations, the A/C phases always 
changed between the first and second observations, but not between the 
second and third.   Repeated observations at other bands never resulted 
in a phase change. 

    In yesterday's tests, these behaviors have changed. 

    A)  The phase change between the first and second scans in the 
stress test has gone away.  Good news.  This (long-standing) problem was 
caused by the error noted by Barry, and repaired by Bryan. 

    B) The phase change behavior in the multi-band file for polarimetry 
studies is completely different -- and defies simple description.  I 
shall take some plots to Barry. 

    Some other bad things happened, which I shall describe separately.