On 23 June 2010 03:29, Poul-Henning Kamp <p...@phk.freebsd.dk> wrote: > In message <8f43d37e769b4caab3309830e40dd...@warcon28gz>, "WarrenS" writes: > >>That is really all there is to it, if one starts with Frequency differences, >>like the TPLL, and not Phase, like most other methods, to get the raw data >>to use with an ADEV program like "PLOTTER". > > While it is absolutely true that you can calculate ADEV from frequency > measurements, you have a very tough row to hoe when it comes to proving > that your frequncy samples represent the same signal as a sequence > of zero deadtime period measurements would do.
Well, it is zero dead-time because all differences between the oscillators are continuously integrated into the output. There is no period where the PLL is disconnected so as to induce bias into the result. > The time-delay inherent in any PLL really, really, really mucks the > math up in that respect. I understand the point you are trying to make here but this is a Tight PLL implementation with the loop bandwidth much greater than the minimum sampling period. Maybe that does complicate the math but the concept is sound as there is no difference in this part of the method than in the original NIST paper describing methods of frequency measurement. > With that said, I'm really, really, really sick and tired of this > TPLL thread. There is always the 'Del' key if you do not wish to contribute to this, otherwise please do not complain. Steve > Poul-Henning > > > -- > 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. > -- Steve Rooke - ZL3TUV & G8KVD The only reason for time is so that everything doesn't happen at once. - Einstein _______________________________________________ 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.
