[ntp:questions] Remarkably good CPU oscillators?

David Woolley david at djwhome.demon.co.uk
Sun Nov 5 23:32:25 UTC 2006

In article <FK6dnUAg86dZhdPYnZ2dnUVZ_oWdnZ2d at comcast.com>,
Richard B. Gilbert <rgilbert88 at comcast.net> wrote:

> If this oscillator is "free running" it is, indeed, remarkable.  If it 
> is GPS disciplined it's what you should expect!

The frequency correction that ntpd reports is the difference between the
free running clock frequency and the disciplined frequency, so should have
the full variability of the undisciplined clock.  The figures he quotes
are unremarkable for an undisciplined PC crystal in a temperature buffered,
but not closely controlled, environment.

One would hope that two GPS disciplined oscillators would track each other's
frequencies much much better than this.

More information about the questions mailing list