[evlatests] Phase Hopping Antennas

[Claire Chandler]

Note, my phase jumps are on scan boundaries without source changes, not on 
source changes.  But it might be caused by the same thing.

Claire

On Tue, 2 Aug 2011, Bryan Butler wrote:

>
> this matches with claire seeing them on 7, 13, and 22.
>
> 	-bryan
>
>
> Rick Perley wrote, On 8/2/11 15:02 PM:
>>      It has been recently reported that some antennas are hopping phase
>> upon change of source (and not necessarily when the band is changed).
>>
>>      The 'switch stress test' provides an opportunity to look for this.
>> To remove atmospheric effects, I differenced the phases from IFs 1 and
>> 2, for each of RCP and LCP.  The results are quite striking:
>>
>>      There are three antennas which display frequent bad hopping.
>>
>>      1) Antenna 22 at all bands.
>>      2) Antenna 13 at all bands *except* X and K.
>>      3) Antenna 12 at all bands *except* X
>>
>>      In addition, antenna 7 hops at most bands, but only did so on one or
>> two scans.
>>      Antenna 9 and 11 also showed an occasional hop.
>>
>>
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