[time-nuts] ...Your thoughts on the Trimble Resolution T?

[Ulrich Bangert]

Normand,

> For my application (GPS
> disciplined frequency standard), the 100PPS option
> will surely help settle the frequency for the few
> seconds after turn-on/reacquisition.

Surely you can build a frequency standard in this way, but be prepared
that it will not be a good one! Take a look at the sigma-tau-diagram of
a gps receiver and that of a good ocxo and you will understand.

Regards
Ulrich

> -----Ursprüngliche Nachricht-----
> Von: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] Im Auftrag von Normand Martel
> Gesendet: Freitag, 31. März 2006 05:10
> An: Discussion of precise time and frequency measurement
> Betreff: Re: [time-nuts] ...Your thoughts on the Trimble Resolution T?
> 
> 
> Well, thanks for the advice!
> 
> ...And also one other convincing (at least for me)
> feature:
> 
> The M12+ has a choice of either a 1PPS precise signal
> or a 100PPS precise signal. For my application (GPS
> disciplined frequency standard), the 100PPS option
> will surely help settle the frequency for the few
> seconds after turn-on/reacquisition.
> 
> But i saw a line, i'm not sure about:
> 
> (specs for the M12M, the replacement (starting july
> 2006) of the M12+
> 
> Timing accuracy:
> 
> Performance using clock granularity message:
> 
>   Better than 2ns, 1 sigma
>   Better than 6ns, 6 sigma
> 
> Performance NOT using clock granularity message:
> 
>   Better than 10ns, 1 sigma
>   Better than 20ns, 6 sigma
> 
> What's that clock granularity message?
> 
> For me, It looks like a message telling the actual
> error of one particular 1PPs pulse. Does it sound
> right?
> 
> And also, how do i know or decide the actual error
> range (1 / 6 sigma)
> 
> Thanks all!
> 
> 
> --- SAIDJACK at aol.com wrote:
> 
> >  
> > From the leapsecond.com website, it seems the
> > Trimble gets 2.15E-011 at
> > 1000s intervalls.
> >  
> > The M12+ achieves 2.9E-012 at 1000s intervalls.
> >  
> > The M12+ is speced at 10ns 1-Sigma, the Trimble
> > seems to be 15ns at  1-Sigma.
> >  
> > There is an M12+ follow-up modell comming soon which
> > is even better  than
> > this data.
> >  
> > Then there are the curious spikes that
> > leapsecond.com mentions...
> >  
> > Seems the Trimble is significantly worse than the
> > Motorola GPS?
> >  
> > bye,
> > SJ
> > 
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> 
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