[evlatests] ea16 status

[Bryan Butler]

thanks, wes.


Wes Grammer wrote, On 7/16/14 8:27 :
> Bryan, we had planned to have a look at them yesterday, but ended up
> spending almost the whole day at 16. We have a large crew going out
> today, and will check out 5 & 10. I'm pretty sure there's probably still
> water in the feed.
>
> -Wes
>
> On 7/15/2014 3:54 PM, Bryan Butler wrote:
>>
>> did you have a chance to look at 5 & 10?  it may be that it rained
>> after they were drained yesterday, because they both are not working
>> at X-band.
>>
>>     -bryan
>>
>>
>> Wes Grammer wrote, On 7/15/14 14:43 :
>>> A quick, real-time update on ea16 receiver status:
>>>
>>> 1. L-band output cables have been swapped, to correct the polarization
>>> problem.
>>>
>>> 2. We've been unable to cool the S-band RX since ea16 went online last
>>> week. Cryo is here right now, checking the vacuum distribution system
>>> for leaks - there wasn't an obvious problem with the receiver itself.
>>>
>>> 3. The X-band feed did have a substantial amount of water inside. We
>>> dropped the receiver and radome cover to drain and dry it out. Before we
>>> leave, we'll reseal it and verify the dry air system is working.
>>>
>>> At this point, all 7 other cryogenic receivers are cold and appear to be
>>> functioning normally.
>>>
>>> -Wes
>>>
>>>
>>> On 7/15/2014 11:15 AM, Ken Sowinski wrote:
>>>> On Mon, 14 Jul 2014, Ken Sowinski wrote:
>>>>
>>>>> a16 is on the master pad and is beginning to work.
>>>>>
>>>>> Current problems:
>>>>> 1.  L band ploarizatios are swapped
>>>>> 2.  S band fringes are weak; perhaps the rx is warm.
>>>>> 3.  No fringes at X band; more water?
>>>>>
>>>>> A pointing run is needed.  That can be doen at C band tongiht if
>>>>> the antenna is still working at the end of the day.
>>>> Tilt for ea16 was determined from the pointing run of last night,
>>>> so the antenna may be moved whenever desired.
>>>>
>>>> I have not yet verified that any of the problems listed above have
>>>> been remedied.
>>>>
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>>>
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>>