[ntp:questions] ntpd: time reset problem

David J Taylor david-taylor at blueyonder.not-this-part.nor-this.co.uk.invalid
Thu Sep 17 06:33:26 UTC 2009


"David Lord" <> wrote in message 
news:7hd884F2t62hbU1 at mid.individual.net...
[]
> That's good enough for me. The usb connection rules out
> PPS mode and seems to limit to +/-10ms.
>
>
> cheers
>
> David


Why rule out PPS?  I tried a GPS/PPS signal over USB and found a jitter of 
about 45 microseconds:

  http://www.satsignal.eu/ntp/NTP-on-Windows-serial-port.html#usb

I suspect that's far better than a radio-clock would require.  If your USB 
hardware/software allows, I would certainly try PPS.

Cheers,
David 




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