[evlatests] Some Non-Functional Switched Powers ...

[Rick Perley]

    An hour-long test, in preparation for 'flux densities' was done last 
night.  About 13 northern objects were observed at X, Ka, and Q bands. 

    Two significant issues with the switched power were found:

    ea02 at X-band:  Zero PDif, but good PSum on all four IFs.    
Clearly, the diode is not switching. 

    ea08 at Q-band:  Same as above -- but I note that for all four IFs, 
the reported (and unchanging) PDif is very negative -- about -25 
millicounts.  This is a significant value, at least 5 times the noise in 
the measurement.   Something not right is going on. 

    If memory serves me right, both of these non-functioning switched 
power issues have been reported before. 

    A number of antennas, particularly at X-band, are showing large 
changes in switched and total power when changing scans.  This is not 
supposed to happen (as I carefully observed long enough on the first 
scan to ensure 'set and remember' should be able to work).