[evlatests] ea16 status & X-band water leaks

[Dan Mertely]

Jim Boswell told me yesterday that the clamps are awaiting painting
(for quite some time!).  They have been fab'd, and are in-queue.
-Mert

On 7/16/2014 9:15 AM, Gene Cole wrote:
> We once had an issue with the feed window clamp on ea17 where water kept getting into the X-feed.  This was remedied by replacing the four piece clamp with a two piece clamp.  I had presumed we were changing out all the other 4 piece clamps.  I'll investigate where we are and report back.
>
> As for  dry air systems only 13 and 26 remain to be outfitted.
>
> --Gene
>
> -----Original Message-----
> From: evlatests-bounces at nrao.edu [mailto:evlatests-bounces at nrao.edu] On Behalf Of rperley at nrao.edu
> Sent: Wednesday, July 16, 2014 8:54 AM
> To: Bryan Butler
> Cc: evlatests at nrao.edu
> Subject: Re: [evlatests] ea16 status
>
> 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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