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: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] 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! > > > --- [EMAIL PROTECTED] 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 > > > > _______________________________________________ > > time-nuts mailing list > > [email protected] > > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > > > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com > > _______________________________________________ > time-nuts mailing list > [email protected] > https://www.febo.com/cgi-> bin/mailman/listinfo/time-nuts > _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
