[evlatests] ea20 gain variations

[Rick Perley]

     I noted last week how the switched power system nicely corrects 
gain changes at X-band.

     In another 'beam holography' run, taken Sunday evening at 6cm, the 
same type of gain variations noted earlier in ea20 at X-band are present 
in that antenna at C-band.  I attach a plot of the 'PDif' values.  The 
gain variations are significant -- about 10% in power. The timescale is 
about 1 hour.

     I would guess that something is quite amiss with the temperature 
control, since this behavior is seen on (at least) two different bands.


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