There are techniques to remove/eliminate the phase error when the GPS source comes back on line. If the holdover is entered appropriately, the frequency error should be small and dependent on the stability of the OCXO.
-----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on Behalf Of Bruce Griffiths Sent: Sunday, January 25, 2009 1:01 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Home made GPS disciplined atomic clock ewkeh...@aol.com wrote: > Its main purpose was time synchronization. Bert > > Bert But time and frequency are dual aspects of the same phenomenon. The only real concern is the behaviour of the Thunderbolt when recovering from holdover. There will be transient time (phase ) and frequency excursions. One can either allow a jam sync for fast correction of any accumulated time error or disable it and accept the potentially larger frequency excursions as the disciplining loop locks the PPS output to GPS time. Performance during holdover depends on whether the Kalman filter has accumulated sufficient information to correct for drift tempco and other predictable errors during holdover. Bruce _______________________________________________ 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.