[time-nuts] GPSDO design articles

Charles Steinmetz csteinmetz at yandex.com
Sat Sep 3 16:27:06 EDT 2016

I am pleased to report that Didier has moved these document to the 
general population on ko4bb.com. They can be accessed by going to the 
"Manuals" page <http://www.ko4bb.com/getsimple/index.php?id=manuals> and 
searching for "PTF", or by following the document-specific download links:



Best regards,


> Finally for today, I posted two white papers from PTF, Inc. that discuss
> the basics of GPSDO design.  These are the best accessible discussions
> of "how it's done" at the professional level that I'm aware of, and
> (IMO) should be required reading for anyone attempting a DIY GPSDO design.
> Note that some of the ADEV graphs show the use of local oscillators that
> are less stable at short tau than most time-nuts would use, so the
> corresponding crossover frequencies are lower (PLL bandwidths are
> higher) than would be appropriate for a time-nuts grade GPSDO by a
> factor of ~10.
> The file names are:
>       Basics_of_GPS_discipline_PTF_AN_APP-29
>       Optimizing_stability_in_GPSDO_design_PTF
> (Didier's system will convert the underscore characters to spaces for
> indexing.)
> Once again, these are still in quarantine, but will be searchable when
> Didier moves them into the general population (which could take several
> weeks).
> When that happens, "PTF" will be a good search term.
> Best regards,
> Charles

More information about the time-nuts mailing list