On Sun, Mar 07, 1999 at 08:09:50PM +0100, Poul-Henning Kamp wrote:
> I don't think Ollivier is doing PPP/hardpps() yet, at least I have not
> given him the semi-magic code needed for it :-)
>
> I wouldn't recommend trying it either, he is bound to have a >1
> msec jitter on the DCF77 waves at his place, and that is a lousy
> diet for hardpps().
I agree; jitter with a low-cost DCF77 receiver is even more than
that (5 to 10 ms). I tend to believe it's partly due to how the AM
signal is demodulated and not that much from the location (Paris
is not that far from Frankfurt after all). Maybe a lower jitter
could be obtained by averaging 10 or 100 samples, I suppose that's
how high-quality receivers work. This might be done in the ntpd
driver.
--
Pierre Beyssac p...@fasterix.frmug.org p...@fasterix.freenix.org
{Free,Net,Open}BSD, Linux : il y a moins bien, mais c'est plus cher
Free domains: http://www.eu.org/ or mail dns-mana...@eu.org
To Unsubscribe: send mail to majord...@freebsd.org
with "unsubscribe freebsd-current" in the body of the message
