In message <[EMAIL PROTECTED]>, Hal Murr ay writes: >How do I setup 2 clocks so they are ticking within 1 ns of eachother? > >[...] > >One approach is to make a symmetrical setup: send your signal to the other >site, compare the signal from the other site with yours, adjust one knob >(pick one) until the offsets match. That's ugly since you now have to >measure an offset rather than tune for a null. Is there a way to avoid that?
That's how you do it. You can either have one end fixed (free-running) and the other end slaved to it, or you have have both goal-seeking with twice the timeconstant. The latter is the easier way since the setup i symmetric: Both ends attemt to reach the same offset between received time and local time. You can either do it by having the both strive for zero offse and let the mutual fight find the average for you, or you can have communication between them to sort out the goal value. Striving for zero is simpler (you don't need to actually measure the offset, an analog solution will do) but more noisy and requires longer time constants gain. -- 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] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
