[evlatests] Ka Band switched power, and more ...

Rick Perley rperley at nrao.edu
Fri Jan 29 12:35:16 EST 2016


     We had a short Ka band beam holography run last night.  Lovely 
data, except ...

     1) ea22's switched power is zero on all SPWs.  (Zero means there is 
noise, but no demodulated signal).  Likely the diode is not being 
commanded to switch, or it's not providing any power.

     2) Something was really weird with ea11 in the LCP side for the BD 
IFs (i.e., IF 'D').  The visibilities to that antenna were about 4 times 
too high.  Reviewing the switched power data, I see that the PDif values 
are about 20 times too high (except in SPWs 1 and 2, where they are 
negative ...), as are the PSum values.  These are consistent with the 4X 
too high visibilities.  So evidently, this antenna did not get its 'set 
and remember' values done correctly.




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