[evlatests] Phase stability of ea27 {External}

[Rick Perley]

If affects both.  The L and S data were 8-bit, the C, X, and Ku data 
were 3-bit (from last night).  I didn't see this behavior on the 
identical database from two days earlier.

Rick

On 6/30/23 11:25, Rob Long wrote:
> 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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