[evlatests] Other S-band issues

[Ken Sowinski]

On Tue, 3 May 2011, Rick Perley wrote:

>    1) PDif values from antenna 6 in RCP (both IFs A and B) are wildly
> oscillating by over a factor of two, with no recognizable pattern.  It
> looks like noise, except the values are far higher than noise values --
> they are not centered about zero, but at a much higher positive value.
> PSum looks fine.  I think this situation has been this way from the
> beginning.

This looks like a receiver problem.  The measured "sync det" at
the downconverter is about 0.5 instead of less than 0.1 indicating
excess noise from the receiver.