[time-nuts] Re: Question about GPS 1PPS ADEV

[Bob kb8tq]

Hi

Any time you look inside a control loop, there will be bumps and 
the like that are a function of the control loop plus the dynamics
of the device being controlled plus the environment. If you have
a straight line … something is wrong. 

Bob

> On Apr 16, 2022, at 1:20 PM, Matthias Welwarsky <time-nuts at welwarsky.de> wrote:
> 
> On Samstag, 16. April 2022 17:55:17 CEST John Ackermann N8UR wrote:
>> Finally, it looks like you're comparing the raw PPS with an oscillator 
>> that is steered by that same PPS.  I have to think their correlation 
>> could lead to possible and unpredictable errors.  It would be better to 
>> have the OCXO remain unsteered during the measurement.
> 
> That's correct. But I'm not trying to characterize the OCXO or the GNSS 
> receiver. I was just wondering about this perceived discrepancy.
> 
>> 
>> Best,
>> John
>> ----
>> 
>> 
>>> Best regards,
>>> Matthias
>>> 
>>> https://hamsci.org/sites/default/files/publications/2020_TAPR_DCC/
>>> N8UR_GPS_Evaluation_August2020.pdf
>>> 
>>> 
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