[time-nuts] M12 100 Hz vs. 1PPS measurements

Poul-Henning Kamp phk at phk.freebsd.dk
Mon Dec 8 10:21:45 UTC 2008


In message <349AFE062799479DA9F8B33D14C077D9 at pc52>, "Tom Van Baak" writes:

>> What about Jupiter's 10 KHz output under same conditions?
>>
>Yes, a Jupiter is next on the list. My expectation in all these cases
>is that more pulses per solution does not give any additional timing
>accuracy.

That depends what clock-frequency is used to generate the pulses.

If that frequency is close to integer Hz, then it won't help much
and we get all the usual trouble with "hanging bridges".

If it is close to, but not quite a low modulus to 1Hz, N.33337 Hz
for instance, it will help, because the 10.000 pulses will sample
the "real" value and the average of them will give a sqrt(9999) ~=
100 times better resolution.


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