From: "Matt Ettus" <[EMAIL PROTECTED]> Subject: Re: [time-nuts] M12T and M12M Date: Wed, 14 Jun 2006 16:48:30 -0700 Message-ID: <[EMAIL PROTECTED]>
> Is there logic (that I'm missing) to what seems like such an odd frequency? Hint: 16 x 1023000 = 16368000 Hz 1,023 MHz match the chipping rate of C/A code. Perfect match is not the end of the world since you need to compensate for doppler and deviations. The actual frequency 16367000 is however a bit strange since it is 2*2*2*5*5*5*13*1259. Cheers, Magnus > Matt > > On 6/14/06, Randy Warner <[EMAIL PROTECTED]> wrote: > > Tom, > > > > You're close. The M12 series actually has a 16.367 MHz crystal (TCXO in > > the M12M). What enables the M12 to get down to +/-12 ns is that it can > > place the 1PPS on both the rising and falling edges of the clock. > > > > Randy > > > > ________________________________________________________________________ > > ________________________________ > > > > -----Original Message----- > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > > Behalf Of Tom Van Baak > > Sent: Wednesday, June 14, 2006 2:39 PM > > To: Discussion of precise time and frequency measurement > > Subject: Re: [time-nuts] M12T and M12M > > > > > Can somebody tell me the master clock frequency of the M12T and M12M > > > GPS receivers? > > > > > > Thanks, > > > Matt > > > > The old Oncore VP used a 9.54 MHz oscillator and had sawtooth error of > > about 104 ns (+/- 52 ns). The > > M12 has jitter closer to 25 ns (+/- 12 ns) which would imply a clock > > frequency of approximately 40 MHz. > > > > See also: > > http://www.leapsecond.com/pages/m12/sawtooth.htm > > > > /tvb > > > > > > > > _______________________________________________ > > 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 > > > > _______________________________________________ > 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
