[time-nuts] GPSDO control loops and correcting quantizationerror
Bob Camp
lists at rtty.us
Sun Sep 16 19:51:55 UTC 2012
Hi
…but endless testing for minimal return is what being a Time Nut is all about ….
Bob
On Sep 16, 2012, at 3:39 PM, "Poul-Henning Kamp" <phk at phk.freebsd.dk> wrote:
> In message <2DEA9396-95EB-4092-A443-A72350CC1D19 at rtty.us>, Bob Camp writes:
>
>> The basic assumption is that this is a lab gizmo and that there
>> is indeed a static adev (or very low frequency phase noise) plot
>> for the OCXO (or Rb).
>
> Bob,
>
> I think this is where the premier-league differs from the
> amateurs-leagues in the time-nuts competition :-)
>
> I suspect that the majority of GPSDO's on this mailinglists do
> not have access to a independent frequency standard good enough to
> make that measurement, much less a temperature controlled environment.
>
> Yes, in a lab environment, you can measure and adjust it once and
> for all, or at least once for every few years.
>
> The rest of us may find it easier to have a PLL that auto-optimizes
> so that we don't have to waste our limited time-nut time on
> recalibrating our house-standard.
>
> --
> Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG | TCP/IP since RFC 956
> FreeBSD committer | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by incompetence.
>
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