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

[John Miller]

I have yet to find a reliable source for this, but something I have heard in the past is
that since the different constellations' satellites may be controlled and disciplined 
differently (and to different standards), it is not wise to use more than one constellation
on receiver that is used to discipline a time server. 

Like I said though, I have not found a reliable source for this, and I haven't even been
able to confirm it in my own testing. I would love to know more on the subject.

Regards,
John Miller

> On Apr 21, 2022, at 7:48 AM, Markus Kleinhenz via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> Hello Matthias,
> 
>> Of course curiosity got the better of me. I switched the GPSDO to hold-over 
>> and recorded about 4000 seconds of data. Result is attached. BTW I terminated 
>> the experiment after the temperature compensation kicked the DAC one LSB down. 
>> I am quite pleased with the performance of the OCXO, though. I was not 
>> expecting that, it is really nothing special. Not a surplus Chinesium OCXO, 
>> but something you can buy for quite reasonable money from Digikey.
>> 
>> So, the bulge is getting a bit more prominent, but it is in no way as 
>> prominent as the figure 26 in John Ackermann's paper. 
>> 
>> John, what constellations did you have enabled during the test? Just GPS, or 
>> also others? I usually run with GPS and Galileo enabled (and I avoid GLONASS, 
>> it messes everything up). Can this make a difference?
>> 
>> 
> Could you explain further how enabled GLONASS messed things up for you?
> 
> Regards,
> 
> Markus
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