Richard H McCorkle wrote: > Bruce, > The 100M OCXO is undisciplined so your first case should > be satisfied. > > Thanks, > > Richard > > Richard
To achieve proper averaging of the TIC measurements the location of the TIC oscillator output zero crossing has to slowly wander with respect to the OCXO zero crossings so that the averaged TIC measurements are made over a wide range of relative phases (ideally over a range of 1 TIC oscillator period or more). For short averaging times the TIC OCXO may be too stable. You will need to measure the relative drift/wander between the TIC oscillator and the OCXO zero crossings over the averaging period to ensure that there is sufficient variation. Either a time interval counter like a 5370 could be used for this. Failing this an analog phase comparator can be used (first divide the TIC oscillator down to the same nominal frequency as that of the OCXO). You also need to characterise/measure the sawtooth corrected PPS jitter. 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.