Hi
> On Jul 21, 2016, at 7:17 PM, Poul-Henning Kamp <p...@phk.freebsd.dk> wrote: > > -------- > In message <4763643485B04450A76F7C04BA8CFB63@pc52>, "Tom Van Baak" writes: > >> There are highly-prized commercial instruments that do this. But >> no amateur has tried yet. > > It would be more precise to say that no amateur has been willing to > talk about their results yet. > > I personally know several have tried and failed at various levels > of performance. > > My own personal experience, both analog and VHDL, is that there is > a particularly long and noisy way from theory to practice in this > space. > > The one thing I have *not* tried, and the only one I think has any > realistic chances, is to use a DDS chip which has a phase modulation > register. If you go the DDS route, it really needs a post filter to make it “fly right”. The narrower the filter, the better it gets. Pretty quickly you are into an ovenized filter. Is that better or worse than an ovenized phase modulator? Not at all clear. Bob > > That should get you to a nanosecond without too much trouble. > > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > p...@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. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
