[evlatests] System Check, Friday 23 march.

[Rick Perley]

    I found a spare 30 minutes to check the system.  Continuum, 50 MHz 
(except at P-band, 3 MHz), fast dumping.  Nothing sophisticated. 
    Antenna 24 was out of the array.  All other EVLA antennas were 
pointing. 

    Results:

    P-Band.  Antennas 14, 17, 23 are all working fine on all four IFs. 

    L-Band:  No fringes from 21 -- still no receiver installed?  All 
others are o.k. 

    C-Band:  No receiver in 23.  Erratic or no fringes from 26, which is 
claimed to have a receiver. 
                      Very poor SNR from 13 and 17. 

    X-Band:  21, which worked earlier this week in IFs B and D, is 
giving garbage in all IFs now. 
                    14 is low by 40% in SNR.  17, 18, and 23 low by 
20%.  (These are low priority problems). 

    K-Band:  Nothing from 21.  14 and 18 give very poor sensitivity, 13, 
17, 23, and 26 are poor.  Only antenna 16 has good sensitivity.  
However, referenced pointing failed for most EVLA antennas, so some 
fraction -- perhaps all -- of the poor sensitivities are from poor 
pointing.  In addition, the weather was not good. 

    Q-Band:   Antennas 14 and 17 are fringing, but at a level so low as 
to render them effectively dead.  Antennas 17, 21, 23 and 26 have no 
receiver.  Antennas 13 and 16 look o.k.  Same comments about pointing 
and weather apply here.   Referenced pointing failed on all EVLA antennas.