Gents, after the discussion of the pic pps divider's properties let me add that on
http://www.ulrich-bangert.de/html/downloads.html you can find a version of the pps divider that has been adopted to the Atmel AVR Mega world. Two versions are available, one uses port A and a second uses port D for the outputs. In contrast to the original design the 100 kHz output has a near perfect 1:1 duty cycle. In the zips you find complete WinAVR projects. Best regards Ulrich Bangert > -----Ursprungliche Nachricht----- > Von: [email protected] > [mailto:[email protected]] Im Auftrag von Poul-Henning Kamp > Gesendet: Dienstag, 31. Marz 2009 07:30 > An: Discussion of precise time and frequency measurement > Betreff: Re: [time-nuts] PIC Divider Performance (was Re: > time-nuts Digest,Vol 56, Issue 71) > > > In message <[email protected]>, John Ackermann N8UR writes: > > >Therefore, the PIC divider is a bit above the 5370B noise floor, but > >not much. > > Many years ago, I did a similar experiment, but to eliminate > the timebases from the measurement I used the PPS output as > start and the 10MHz input frequency as stop. > > That way only the delay & jitter of the PPSDIV is measured (+ > cables & counters obviously). > > The result were of similar magnitude. > > 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. _______________________________________________ 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.
