[evlatests] ea16 status

[rperley at nrao.edu]

Are any of the wet X-bands outfitted with the dry air system?

Any reason why only X-band is suffering this problem now?

Rick

> 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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>>>
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