Hi A few more possibilities:
1) Slip the clock by one cycle per second rather than 10 at once. 2) Take the pps off of a 100 MHz source sync'd to the 10 MHz and slip by less than 100 ns per step 3) Take the pps off of a DDS and fine tune the slip however slowly you might wish. In practice, the approach is "get back to +/- 100 ns as soon as you can". The system majority of specs care about being at the right time, and not so much how you get there. There are a few specs that prefer a frequency slew to bring the pps in from microseconds of error, but not many. Bob On Nov 30, 2012, at 9:10 PM, Hal Murray <[email protected]> wrote: > > Does anybody know what happens in a TBolt or Z3801? (or any other boxes?) > > > Suppose your system goes into holdover for long enough to be interesting. > Suppose for discussion that the clock drifts so that the PPS if off by a > mircosecond. > > I can see two ways to recover. One is to jump the 10 MHz clock by 10 cycles. > The other is to adjust the frequency so that the PPS slews back to on-time. > > The first approach gives you a second with the wrong number of cycles. The > second approach has your clock frequency off for a while with a trade off > between how far off and how long it's off. > > Are there any other approaches? > > > -- > These are my opinions. I hate spam. > > > > > _______________________________________________ > 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.
