[evlatests] ea13 status: revised

[Jerry Langevin]

The RCP RF plate was replaced in Ant-13 today. The antenna still does 
not fringe.


Jerry

On 8/7/2014 2:32 PM, Eric Chavez wrote:
> Ken,
>
> I was able to look at this problem regarding IFB. I agree it looks like
> it is the RCP RF plate in the UX. I have informed Terry, and Jerry is on
> his way to begin this repair. I also opened a maintenance form in
> mainsaver for tracking.
>
> Eric
>
>
> On 8/7/2014 11:14 AM, Ken Sowinski wrote:
>> On Wed, 6 Aug 2014, Ken Sowinski wrote:
>>
>>> All receivers are now installed.  All work except for K band
>>> which does not fringe at all.  It behaves as if the horn were
>>> not connected to the sky.
>>
>> Allthe high frequency feeds were alignedand braced this morning.
>> Ka and Q band still look fine.  K band, however is still dead
>> in the sense of no fringes.
>>
>> I pointed the array at the Sun while at K band and ea13 showed
>> no change inTP while other antennas increased by 20 dB or so.
>> Is it possible that the feed cover was never removed?
>>
>>
>> Another, independent, problem is that the power into the T304
>> for IF B, and only IF B, is much to low when setup at K, Ka
>> and Q bands, but not at Ku band.  In these tests the direct
>> path was used for both IF pairs at K band and higher.  Looks
>> like a problem in the T303.
>>
>> Ken\
>>
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