[evlatests] antenna 26

[Jim Jackson]

Rob is going to check the connections to the T304 inputs to see if RCP is 
being fed to both units.   He is also going to check to make sure the 
fibers on the deformatters are not swapped between the high and low 
channels - Mike Revnell just showed me FFT plots that seem to suggest this.

I'm not sure what to do about the L302 synthesizers. We seem to be having 
this AGC problem with a few of them that are currently in the lab. We don't 
currently have any L302's that work sufficiently well to replace it or the 
second unit in 24.  Rob is swapping another RevA L302 into Antenna 16 IF BD 
today.

Jim

At 08:40 AM 9/13/2006, you wrote:
>On Tue, 12 Sep 2006, Ken Sowinski wrote:
>
>>On Tue, 12 Sep 2006, Ken Sowinski wrote:
>>
>>>the distribution among correlator products is interesting.
>>>AA  very 0.18, steady phases
>>>CC  weak amplitude
>>>AC  0.17, steady phases
>>>CA  very weak amplitude
>>>I am hard pressed to see how to get it to do this.
>>
>>This is consistent with RCP, at the same sky frequency, being
>>delivered to both downconverters.  An RF splitter in the receiver
>>delivering RCP to both output terminals would explain this and
>>the low power seen in the downconverter.  Of course there are
>>many other ways to get this to happen.
>
>I seem to be continuing to answer my own emails.
>
>It must certainly be the case that the signal that should go
>to T304-B is connected to T304-C.  That still leaves us to
>find an explanation for the low power seen in the downconverters.
>
>Ken