[evlatests] ea16 status

[Wes Grammer]

Rick, I believe the dry air system was functioning on ea05, but the 
desiccant was saturated - possibly the radome was leaking too much for 
heavy rain we had. On ea10, James Boswell reported the compressor for 
the dry air system had experienced a failure, which might have 
contributed to the trouble. I think that both of these issues have been 
addressed by now, but I'll look into it on Friday.

Because of some required training for our group this morning and 
thundershowers this afternoon, we were unable to make it back to ea05 & 
ea10 today for a follow-up visit. More mandatory meetings tomorrow, so 
it will be Friday morning before we can try again. Jon Thunborg gave me 
two sets of the new two-piece radome clamps, which we will install on 
ea05 and ea10, after letting the feed air out.

-Wes

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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