[evlatests] An example of why we should apply switched power

[George Moellenbrock]

Rick-

Would some manner of _online_ normalization by ACs (a la old VLA) have 
compensated for this?  I.e., is the sinusoidal effect evident in ea02's 
AC (assuming you have it)?  Just curious.

-George


On Tue, 13 Nov 2018, Rick Perley wrote:

>     In the switching tests, a spectacular case of how switched power can help 
> has been found.
>
>     At C-band, during the last 30 minutes of the test, ea02 developed large, 
> sinusoidal gain variations.  Although both RCP and LCP showed this, the LCP 
> is much the larger.  The period is about 1 minute, the power amplitude about 
> 9%.  In RCP, the variations are much smaller, about 0.8%, and are *exactly* 
> out of phase with the LCP variations.
>
>    Blind application of the switched power was done, which completely removed 
> the cyclical variations.
>
>     Attached are the CALIB solution gains, the first without switched power 
> applied, the second with.
>
>

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