[time-nuts] Austron 2201, Tbolt, HP 3801 comparison question

[Timeok]

I have done some test on three GPSDO, plese see this link:
http://www.timeok.it/files/gpsdo_frequency_reliability.pdf
Luciano
--
Luciano P. S. Paramithiotti
IZ5JHJ


--------- Original Message --------
From: Discussion of precise time and frequency measurement
<time-nuts at febo.com>
To: Discussion of precise time and frequency measurement
<time-nuts at febo.com>
Subject: Re: [time-nuts] Austron 2201, Tbolt, HP 3801 comparison  question
Date: Apr 08, 2012 08:26 AM

> Ulrich wrote:
> 
> >The Smartclock in difference seems to be able to adapt regulation
> >parameters to its "measurements" of ocxo stability and long
term drift.
> 
> I do not know any details about Smartclock, but I believe one of the 
> things it does is to adjust the oscillator disciplining parameters 
> (primarily the loop time constant, I suspect, but perhaps more) to 
> allow 3801s to reacquire lock quickly after a holdover event (or at 
> startup), then switch to parameters that reduce the deviation once it 
> is firmly locked.  You have to do that manually with a Tbolt if you 
> want both quick lock and best stability once locked.
> 
> It may also do as you suggest -- use heuristic methods to tweak the 
> "low deviation" discipline parameters -- but I do not know if
that is 
> the case or, if so, if it is better than Kalman filtering.
> 
> Best regards,
> 
> Charles
> 
> 
> 
> 
> 
> 
> 
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