I use a 1.000 MHz crystal oscillator module and a Tek DD501. It produces 1 pulse every (preset count-1) of input cycles. Triggering a scope is trivial.
-John ============= > In message <4fa006e8.5040...@verizon.net>, "Stan, W1LE" writes: > >>I will use a HP-3336C with the station 10 MHz (GPS/DO) reference. >> >>Typo: trigger should really be 11.148272 Hz instead of KHz ! > > You need a really amazing stable and noise-free trigger to lock > onto a 5.5Hz (see below) sine at the required level of stability > (~2usec). > > I used my HP33120A once, but its square output is made with a > comparator on the sine wave, and has pretty bad jitter. > Switching to saw-tooth solved that, defining my own arbitrary > square-wave was even better, not sure why. > > You want 1/(2*.089700) = 5.574136 Hz, otherwise every other > loran-c pulse will cancel out due to the A/B coding polarity. > > If you don't have a counter-based signal generator, consider stealing > a GRI or FRI-rate signal from one of your loran-C receivers, I belive > the AUSTRON 2000/2100 offers it on a BNC at the backside. > > -- > 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.