[evlatests] ea13 status: revised

[Eric Chavez]

Antenna 13 needed another RCP RF plate swapped in the UX Converter. 
Previous plate installed to repair IFB problem on Thursday had an 
intermittent switch. I did this today and tested all HF receivers, all 
tested good.

Eric

On 8/11/2014 3:43 PM, Wes Grammer wrote:
> Ben and Dan had a look under the feed radome today on the K-band RX in
> ea13, and found a lot of water collected at the bottom, right against
> the window. They've drained it out, and are drying the feed as best they
> can. We need a test to confirm it, but it's highly likely we've found
> the culprit.
>
> It's a bit surprising there was so much water in it, as the receiver was
> installed on July 29, the day before it went out on the master pad. Ben
> is looking into whether the radome material and/or retaining ring need
> to be replaced.
>
> Thanks to Dan Mertely for his assistance to Ben today at ea13!
>
> -Wes
>
> 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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