[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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