[evlatests] Phase stability of ea27 {External}

[Rob Long]

The L305 control voltage is not jumping around (looks similar to other 
antennas), optical power in looks normal so I'm wondering if it is one 
of the clocks from the L305/L300 distributed via splitters.

Rob

On 6/30/2023 11:34 AM, Rick Perley wrote:
> 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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