Poul, On 23 June 2010 06:55, Poul-Henning Kamp <[email protected]> wrote: > In message <0c4f750835264e13ab61d4b8c8448...@warcon28gz>, "WarrenS" writes: > >>> you have a very tough row to hoe when it comes to proving >>> that your frequency samples represent the same signal as a sequence >>> of zero deadtime period measurements would do. >> >>Sorry, I though that was obvious. > > Yes, you probably did.
If there was not a continuous zero dead-time connection around the TPLL loop it would be impossible for it to keep lock and track the two oscillators. As you can see from Warren's block schematic, there is a 100kHz filter in the loop to block 2f components from the mixer and a gain block of 100x. From John Miles' tests you can see that the PLL tracks from 0.1s, 10Hz, way out towards 100s, 0.01Hz, or the graphs would not be coherent. As for measurement of ADEV much below 0.1s, it is generally agreed that phase noise noise measurements be performed here. Steve > Poul-Henning > > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > [email protected] | 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 -- [email protected] > 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 -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
