[evlatests] EVLA Today -- 17 Jan 08

[Rick Perley]

    Std. Stress Test Results:

    Comment:  There is abundant evidence that changing to P-band 
necessitates a 'dummy' P-band scan before the P-band target, and that 
changing from P-band to any other band requires a dummy scan at the new 
band. 

    Referenced pointing worked correctly on all antennas. 
   
    Antenna 5 went into the barn today. 

    1) P-Band.

    All working antennas (all but 1, 13, and 16) are working at nominal 
levels, except 23B, which is low by a factor of 65. 

    2) L-Band.

    All antennas working well.  Sensitivity of 21A and B (RCP) is low by 
a factor of 2. 

    3) C-Band.

    All is well, except antenna 1in LCP, sensitivity is low by a factor 
2.5 in IF C, and 4 in IF D.  IF D was flagged out by the system. 

    4) X-Band. 

    All is normal. 

    5) U-Band.

    All is normal

    6)  K-Band.  All antennas fringed.  But:

    - 13A and C low sensitivity by a factor of 1.7
    - 19, all IFs, low sensitivity by a factor of 3
    - 25 all IFs, low sensitivity by a factor of 1.5 to 3. 

       In addition, four antenna-IFs (26B, 18D, 19D and 1C) failed to 
fringe on one of the two scans, but the data were not flagged. 

    7) Q-Band.  All antennas fringed except #1 (which has no receiver). 

       - 13 is low in sensitivity, on all IFs, by a factor of 10. 
       - 18 and 20 are low in sensitivity, on all IFs, by a factor of 2.0
       For all three of these, I suspect pointing errors (bad 
collimation?) 

    Overall:  The EVLA is in great shape.