[evlatests] Standing Wave in IF 'A'

[Jim Jackson]

Having heard no objection to the contrary, Rick and myself are both 
inclined to leave this DTS module in place in EA22 for the duration 
of the 3-bit testing.  We will live with the bandpass ripple in the 8 
bit path on IF-A and repair this module later.

Jim

At 01:31 PM 4/19/2011, Jim Jackson wrote:
>In that case, this requires an upper management decision. Is this
>problem bad enough to warrant removing the 3-bit equipped DTS module
>from EA22 and delaying the 3-bit testing or can we live with it this
>way for a while?
>
>Jim
>
>At 01:21 PM 4/19/2011, Eric Chavez wrote:
> >I just came from ant 22 and swapped the entire signal path between D301
> >and D302. We wiggled cables connectors etc and the problem was always in
> >IF-A. I talked to Kerry Shores while doing this test and I am convinced
> >that the problem is between the input to the D301 and the correlator. No
> >matter what I tried in the LO/IF path, the ripple always stayed the same
> >in IF-A.
> >
> >Rob Long
> >
> >Rick Perley wrote:
> > >     Bandpass solutions at L, S, and X bands show a 32 MHz-period
> > > periodicity, of amplitude 1.5 dB, in IF 'A' only.  Presumably, a bad
> > > match in the T304?
> > >
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