[evlatests] Generally Good News!

[Rick Perley]

    The tests yesterday have given generally good results for all EVLA 
antennas (other than P-band).  Here's a summary of what's not working...
   
    0)  25D was out during these tests -- but has since returned. 

    1)  L-Band:  All 27 antennas working working well.  Sensitivities 
all normal.  The usual EVLA to VLA phase jump occurred on IFs A and C 
only, between the two scans. 

    2) C-Band.  26 antennas up and running nicely.  Only ea25 is out -- 
no receiver.  Antenna 11A and C, and 21 A and C were slow to come to 
gain stabilitization (AGC attenuator adjustment too slow).  The band 
previously observed was P. 

    3) X-Band.  27 antennas up and humming along smoothly.    No phase 
jump occurred between the two scans.  (However, a pointing scan 
separated these two, and those data were not loaded). 

    4)  K-Band.  Some problems here:
         
             a)  Antenna 13 gives very low fringe amplitudes.  Clearly 
related to our subreflector positioning problem. 
             b) Antenna 25 gives no fringes, but has a receiver.  The 
data are correctly flagged. 
             c)  Antenna 18 gives no fringes on IFs A and C, and are not 
flagged.  IFs B and D are normal amplitude. 
             d)  Antenna 11D has been flagged, but gives good fringes of 
normal amplitude. 

          Otherwise, the data quality was very good. 

         In addtion, 14A, 16A and C, and 24A are slow to come to gain 
equilibrium. 

    5)  Q-Band.    Other than the issues of the four antennas below, the 
data quality was excellent -- especially considering this was an 
afternoon observation.  (Weather was clear and very warm). 

          a)  Antenna 11 gave no visibilities.  The data were flagged.  
The antenna has a receiver, installed last week. 
          b)  Antenna 13 gave no visibilities, but was not flagged.  
Clearly due to the subreflector problem.
          c)  Antenna 19 gave no visibilities, and was not flagged.  It 
has a receiver.  I have no idea what is wrong.
          d)  Antenna 25 has no receiver, so gave no fringes (and the 
data were correctly flagged).