[evlatests] Antenna 21

[Jim Jackson]

We just replaced the L302-1 synthesizer in Antenna 21. Hopefully it will 
take care of the AC problem.

I also noticed we could no longer get switched power from P-band. It was 
working fine a few days ago. We'll look at it on Monday.

Jim

At 01:52 PM 4/13/2007, Rick Perley wrote:
>     Some free time available this morning, took a look at antenna 21.
>
>     P-Band:  No fringes from any IF.
>
>     L-Band:  Fringes seen on all IFs, but very weak.  On AC, low by a
>factor of ~20 in amplitude.  On BD, low by a factor ~ 5.
>
>     C-Band:  No receiver.
>
>     X-Band:  Stable fringes on all IFs.  The AC side has two amplitude
>states:  three consecutive low values (at 0.416 sec integration each),
>followed by one high value (so there is a 1.67 second periodicity).
>Sensitivity in the 'high' state is low by a factor of a few.  This is
>thought to be a problem with the L302, and a change is being made today.
>                 On the BD side, good strong stable fringes.  Sensitivity
>still low by a factor of about 2, however.
>
>     K-Band.  No fringes.  Terrible weather too.
>
>
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