Hi The spec they were after was a warmup to "on frequency +/- 1x10^-8" from -40 C sort of thing. I believe the warmup time was under 15 minutes, but I don't know the exact number.
Bob On Jan 9, 2011, at 8:43 PM, Mike S wrote: > At 06:36 PM 1/9/2011, Tom Van Baak wrote... >> The outer oven was a hack so Z3801A could meet telecom cell tower cold >> weather warm-up specs. In other words, the better performance they were >> looking for in that case was warm-up time; not a tempco or frequency >> stability spec. > > The Nortel GPSR (Z3801A) had a very loose warm up spec, which wouldn't have > required a double oven by itself: "The GPSR will be permitted a 24 hour > warm-up/training period in the event of a power loss and the 24 hour holdover > requirement shall be met following this training period." > > The other basic requirement was "+/-1 us traceable to and synchronous with > Universal Coordinated Time (UTC) with at least one satellite in view." Again, > a double oven wouldn't be required for that - the GPS receive itself should > do better. > > OTOH, it had a spec of +/- 7 us for a 24 hour holdover, which required a > double oven. > > _______________________________________________ > 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.
