[time-nuts] Holdover recovery

timeok at timeok.it timeok at timeok.it
Mon Apr 4 20:10:35 UTC 2016


Here the italian version:

http://www.crit.rai.it/eletel/2012-1/121-2.pdf

Luciano
www.timeok.it


On Mon 04/04/16 21:28 , Magnus Danielson <magnus at rubidium.dyndns.org> wrote:

> Hi Hal,
> 
> On 04/04/2016 05:39 AM, Hal Murray wrote:
> >
> > Has anybody studied what happens when a GPSDO comes out of holdover? Has
> > anybody seen any specs? I don't think I have.
> >
> > I think you have a choice of quick recovery for time or frequency, but
> you
> > can't get both.
> >
> > Suppose your setup has been in holdover for a while. The frequency is
> > slightly off. The time offset of the PPS pulse will be the integral of
> the
> > frequency offset.
> >
> > What happens when you come out of holdover? If you fix the frequency,
> the
> > PPS will stay off.
> >
> > Suppose the PPS has drifted by 1 ns. If you correct that in 1 second,
> the
> > frequency will need to be off by 1E9 during that second.
> 
> The RAI laboratory in Torino have made such tests and published 
> measurements and recommendations. For a long time it was only available 
> in italian, but there is now an english version available.
> 
> Cheers,
> Magnus
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