[evlatests] L-Band

[Rick Perley]

    A quick check of L-band performance:

    Continuum, 0.4 sec averages, 1465 and 1385 MHz (AC and BD), 50 MHz BW.
Observations of blank sky, a calibrator, and  Cyg A. 

    1) All EVLA antennas working nicely on all IFs.

    2) No bizarre phenomena noted of any kind. 

    3) ~8% amplitude closure error on EVLA baselines.   (When EVLA antennas
are calibrated on basis of their VLA-coupled baselines, the resulting 
calibrated
amplitudes are about 8% too high).  The cause of this is certainly the 
residual
bandpass phase function. 

    4) System sensitivity judged via distributions of Real and Imaginary 
parts
when looking at blank sky, far from galactic plane.    I calibrated antennas
13, 14, and 16 amongst themselves to remove the offset due to the closure
problem noted above.    Elevation was ~40 degrees. 
          IF 1:  EVLA antennas clearly ~20% noisier than 3 randomly 
selected antennas
(8, 17, 26) picked to have the same approximate baselines. 
          IF2:  EVLA antennas have same noise as the randomly-selected VLA
antennas. 
       This sensitivity measure is very qualitative.