[evlatests] Phase Hopping Antennas

[Bryan Butler]

to clarify.

rick's test is same source, switching bands.

claire's evidence is not switching source or band, just new scans 
(because of the scan length limitation for RSRO).

they both point to the same problem.

	-bryan



Claire Chandler wrote, On 8/2/11 15:12 PM:
> 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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>