Hi If the OCXO is off by 200 ppb, it will slip time by 200 ns per second.
It will be off by a *lot* more than 200 ns at the end of a year. Compared to the spec's on a cell tower OCXO, 200 ppb per year isn't very good... Bob On Aug 5, 2012, at 7:23 PM, mike cook <mc235...@gmail.com> wrote: > > Le 06/08/2012 00:01, Bob Camp a écrit : >> Hi >> >> The part at the link does not appear to have a holdover specification. You >> probably would do better with a TBolt off of eBay. > Agreed. > I took a look at the Axtal AXIOM40 data sheet and they are quoting 200 ppb > per YEAR aging.. That's not bad; so if the device is only affected by that in > holdover, it's only 200ns slow out at the end of a year ... I doubt that my > T-Bolt could do as well. So as to providing a stable frequency it looks fine. > HOWEVER that particular device has1PPS on the DCD line FROM the GPS receiver > and not disciplined by the OCXO, so the advantage is lost and the PPS will > drift at the receivers onboard crystal aging rate while not getting updates > from GPS. So it's not a good choice. Better to get a device with PPS > disciplined directly by the main oscillator and aligned to UTC when the > signal is available as in a T-Bolt. > > -- > Les chiens aboient, et la caravane passe. > > > _______________________________________________ > 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.
