[evlatests] 3-bit 22RCP all fixed, but ...

Ken Sowinski ksowinsk at nrao.edu
Thu Sep 16 17:01:12 EDT 2010


On Thu, 16 Sep 2010, Rick Perley wrote:

>    The repaired sampler is back in the antenna, and the standards tests
> done.  The results are exactly as expected:
>
>    22RCP is now just like the others in LCP.  Antenna 12RCP is a little
> bit high.

That is expected because ea12-t304-a was not getting enough
power at this tuning to drive the sampler correctly.

>    Here's the 'noise matrix':
>
>        12        15       22       28
> --------------------------------------
> 12  |   X       .22      .22     .24
> 15  |  .17       X       .18     .18
> 22  |  .17      .16        X     .19
> 28  |  .17      .17      .17       X
>
>    We now have three good RCP baselines to compare to the 6 good LCP --
> there is a slight, but probably significant, excess in RCP.
>
>    If the duplication experiment (R linked to L) is needed, do it now.
> Then return 12 to base ...

We will connect LCP to both inputs of the DTS module because of
the low power in 12A noted above.




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