[evlatests] Phase stability of ea27 {External}

[Drew Medlin]

Both IFs from the VLASS data. I’ll look through some other PI science pipeline results to see if there is any evidence of other bands being affected. 


Drew Medlin		
dmedlin at nrao.edu

VLA Scientific User Support
National Radio Astronomy Observatory

> On Jun 30, 2023, at 11:13 AM, Rob Long via evlatests <evlatests at listmgr.nrao.edu> wrote:
> 
> This is all bands and all IFs?
> 
> Rob
> 
> On 6/30/2023 11:10 AM, Catarina Ubach via evlatests wrote:
>> I have created https://bugs.nrao.edu/browse/WO-17810
>> 
>> -Catarina
>> 
>> -----Original Message-----
>> From: Bryan Butler <bbutler at nrao.edu>
>> Sent: Friday, June 30, 2023 11:04 AM
>> To: Catarina Ubach <cubach at nrao.edu>; Rick Perley <rperley at nrao.edu>; evlatests at aoc.nrao.edu
>> Subject: Re: [evlatests] Phase stability of ea27 {External}
>> 
>> 
>> 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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