[time-nuts] Strange 100ns jumps on Motorola M12+T

Azelio Boriani azelio.boriani at screen.it
Tue Nov 19 14:01:42 UTC 2013


One M12+ is the reference and the others are DUTs? Three times but in
one direction only for a 300ns total or what? The offset returned to
0? Please, detail better what happened.

On Tue, Nov 19, 2013 at 12:17 PM, Stephan Sandenbergh
<ssandenbergh at gmail.com> wrote:
> Hi,
>
> I've recently measured the 1PPS outputs of three Motorola M12+T GPS
> receivers using two HP53131A TICs. Antennas are located next to one another.
>
> Now I notice the one M12+T has changed its time offset by 100ns three times
> over the period of 48hrs. The jitter remains the same, only the offset that
> changes.
>
> I'm currently having a re-run of the measurement. But, in meanwhile, has
> anyone seen this kind of behaviour? A firmware issue perhaps?
>
> Regards,
>
> Stephan.
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