[evlatests] L band on EA24

[Dan Mertely]

That's because Cryo doesn't believe in the fine
art of RF Black Magic.  -Mert

Chuck Kutz wrote:
> Okay now, let me get this straight;
> 
> Step 1: It appeared that the L-band polarizations were reversed on initial
> install.
> Step 2: John went out and swapped the polarizations.
> Step 3: It appeared that Step 2,  did not fix anything, so John went back
> out and undid step 2 last Thursday.
> Step 4: Cryo went out and swapped the polarizations again last Friday.
> Things appear to be okay now.
> 
> Conclusion: Cryo is better at swapping polarizations than the Front End
> Group is.  :-)
> 
> 
> Chuck
> 
> -----Original Message-----
> From: evlatests-bounces at nrao.edu [mailto:evlatests-bounces at nrao.edu] On
> Behalf Of Bob Hayward
> Sent: Friday, November 04, 2011 4:30 PM
> To: Ken Sowinski
> Cc: EVLA Tests
> Subject: Re: [evlatests] L band on EA24
> 
> For what it is worth, work order number C130120 was CLOSED out after the 
> cables were swapped last week:
> 
> Work Requested:  Failure - R. Perley reports that antenna 24 L-band is
> cross-polarized.
> 
> Corrected Action:  Swapped RCP & LCP at the receiver.  31Oct.11--JMc.
> Adjusted or Completed
> 
> Once again proving that two negatives always make a positive...
> 
> -Bob
> 
> 
> Ken Sowinski wrote:
>> On Fri, 4 Nov 2011, Steven Durand wrote:
>>
>>> The Cryo guys have just finished swapping the RCP with the LCP
>>> onEA24 L band
>> ea24 does indeed work properly at L band.  The polarizations
>> were swapped a few minutes ago.  I cannot say whether that was
>> the problem days ago when no/weak L band fringes were seen.
>>
>>> 3:50 pm  Friday November 4, 2011
>>>
>>> I can not test the L band because the antenna is in a X band
>>> observation.
>>> -- 
>>> Steven J. Durand       National Radio Astronomy Observatory
>>> Electronics Division Head.    1003 Lopezville Road
>>> 575/835-7103                 Socorro, New Mexico  87801
>>>
>>>
>>>
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