[evlatests] Array Status -- Friday Night Test

[Rick Perley]

    The four-mode, three-times-around 'stress test' was run Friday 
evening. 

    The only changes from the previous day are:

    1) The phase jumps peculiar to antenna 2 in IFPair A/C are gone.  
Its L301-1 was changed on Friday. 

    2) The peculiar lack of fringes from antenna 26C, seen only in OSRO1 
modes, has gone.  This antenna/IF now fringes normally in all setups. 

    The remaining problems are as before: 

    1) There are an inordinate fraction of zeros.  In OSRO1 modes, about 
14%, almost all of which strike the same set of antennas within ~ 30 
seconds of a Mode change.  (Since this program changes mode every 3 
minutes, this results in a high fraction of zeros/blanks).  In OSRO2 
modes, we see the additional characteristics that antennas 14, 15 and 
16, in IF 'C', are totally blanked.  The resulting fraction of pure 
zeros is 24%. 

    2) Antenna 17 is very weak in RCP. 

    3) Antenna 12 is very, very weak in LCP. 

    In general:

    Delays remain very small -- less than 4 nsec. 
    Amplitude and phase stability are excellent, as expected with short 
spacings and good weather at 6cm.