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

[paul swed]

Luciano
Thanks it simply appears that I have 3 units and some work better then
others.
Very good comments and read your document
Thanks
Paul
WB8TSL

On Mon, Apr 9, 2012 at 8:53 AM, Timeok <timeok at timeok.it> wrote:

> 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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