[evlatests] Phase stability of ea27 {External}

[Catarina Ubach]

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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