[evlatests] Phase stability of ea27 {External}

[Rob Long]

If we have a loose connection between the L300 and LO or DTS splitters, 
something like this could occur. Do we see this effect in both 8-bit and 
3-bit?

Rob

On 6/30/2023 11:22 AM, Rick Perley via evlatests wrote:
> following up on Bryan's point:  The changes were by many tens of 
> degrees on a timescale of 10 minutes.  It was stable within the 
> calibrator scan, then hopped to an entirely different number 10 
> minutes later ...
>
> No way a baseline error can do that...
>
> Rick
>
> On 6/30/23 11:04, Bryan Butler wrote:
>>
>> It's a good point, but that wouldn't cause the behavior that Rick 
>> sees. It would cause a diurnal sinusoidal error which got worse with 
>> higher frequency, not random amounts for all bands, and changing 
>> between scans.  Seems like a loose connection maybe?  But would have 
>> to be after the converters.
>>
>>     -Bryan
>>
>>
>> Catarina Ubach via evlatests wrote on 6/30/23 10:48:
>>> Antenna 27 baselines parameters have not been updated.
>>>
>>> Catarina
>>>
>>> -----Original Message-----
>>> From: evlatests <evlatests-bounces at listmgr.nrao.edu> On Behalf Of 
>>> Rick Perley via evlatests
>>> Sent: Friday, June 30, 2023 10:09 AM
>>> To: evlatests at aoc.nrao.edu
>>> Subject: [evlatests] Phase stability of ea27
>>>
>>>   From data taken last night, it is noted that ea27's phase changes 
>>> by large, and seemingly random amounts at all bands observed (L, S, 
>>> C, X, and Ku).  This occurs between scans, and is not seen on other 
>>> antennas.
>>>
>>> Rick
>>>
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