[evlatests] ea05 & ea10 X-band

[Wes Grammer]

We went to both these antennas this afternoon, and found another ~3/8" 
of water on the X-band windows, which we removed. We also replaced the 
X-band feed radome sealing rings with the new 2-piece design. The 
operator confirmed they are now fringing, though one was still a little 
weaker than expected.

-Wes

On 7/16/2014 6:31 PM, Wes Grammer wrote:
> 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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