[time-nuts] M12T and M12M

[Randy Warner]

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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