[evlatests] ea16 status

[Gene Cole]

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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