[time-nuts] M12T and M12M

Poul-Henning Kamp phk at phk.freebsd.dk
Wed Jun 14 17:55:45 EDT 2006

In message <009001c68ffa$fdcffc60$f318f204 at computer>, "Tom Van Baak" writes:
>> 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.

The M12 does some kind of temperature compensation, so if you feed
in an external frequency, you need to find a way to turn that off.

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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