[time-nuts] M12T and M12M

Matt Ettus boyscout at gmail.com
Wed Jun 14 23:48:30 UTC 2006


Is there logic (that I'm missing) to what seems like such an odd frequency?

Matt

On 6/14/06, Randy Warner <Randy at synergy-gps.com> 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: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] 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
>
>
>
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