[evlatests] Standing Wave in IF 'A'

[Rick Perley]

    ... and it looks quite stable to me, so it should calibrate out 
quite nicely ...

Joseph P. McMullin wrote:
>
> Hi Jim,
>
> From the perspective of the ongoing science observations, we can 
> endure this
> for a while. My understanding was that it would be a 2-day endeavor to 
> resolve
> the issue and given the current churning on 3-bit testing, it wasn't 
> clear to me
> if this was coming anytime soon.
>
> Joe
>
> On Wed, Apr 20, 2011 at 8:14 AM, Jim Jackson <jjackson at nrao.edu 
> <mailto:jjackson at nrao.edu>> wrote:
>
>     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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> -- 
> Dr. Joseph P. McMullin        
> EVLA                            
> Ph: +1 575 835 7315
> E-mail: jmcmulli at nrao.edu <mailto:jmcmulli at nrao.edu>
> http://science.nrao.edu/evla/
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