[evlatests] P band delays

Rick Perley rperley at nrao.edu
Tue Oct 30 21:27:43 EDT 2007


    I checked the P-band delays, as requested by Ken.  The news is 
uniformly very good:

    1) Antennas 11, 13, 16, and 19 are not implemented or not functioning. 

    2) All remaining antennas are working very nicely at P-band. 

    3) Sensitivities on EVLA antennas at P-band are now *very much 
better* -- and are now equivalent to normal VLA antennas! 

    4) Antennas with notable sensitivity issues are:
                   21 (all IFs), 15 A and 15 B (RCP), and 6D. 

    5) Delays are good on all antennas, except the following (determined 
w.r.t. antenna 9) (threshold is 20 nsec): 
                      7C:   -40 nsec
                      20D:  -40 nsec
                      22B:  +40 nsec
                      24A:  -150 nsec
                      24B    -50 nsec
                      26D:   +50 nsec
             A '+' delays means that the listed delay must be added to 
the current value. 

    6)  The only bandpass with an abnormal shape is 27B. 

Ken Sowinski wrote:
> Rick,
>
> A few minutes of P band data was taken in line mode to
> try to estimate delays.  If you can find someone to look
> at it,
>
> Program name: PDELAY
> Time:         2300 to 2304 IAT
>
>
> Ken



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