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

Poul-Henning Kamp phk at phk.freebsd.dk
Fri Dec 5 12:16:15 UTC 2008


In message <033401c956d1$2278b760$6401a8c0 at WSOffice>, "WarrenS" writes:

>>>The short of it is that every once in a while the 100 Hz syncs up
>>>for a short time to the 1 Hz
>>
>>As far as I have ever been able to tell, that is not how it
>>works.

>The 100 Hz is defiantly update or at least different on every cycle, 
>and has about the same peak to peak noise, which is why if nothing but just 
>average the 100 Hz before using it for the 1Hz update, things would get a
>better.

We are talking about different things here, you are talking about
collapsing the chosen (software) frequency (estimate) to phase
samples using the hardware, I'm talking about updates to the
(software) frequency (estimate).

Poul-Henning

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




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