Hi The “wiggles” he is chasing are about 2-3 Hz (by eyeball on his charts). At 2.4 GHz, that is a fairly convenient ~1 ppb. The Z-3801 (if it was in good health) should be easily able to hold that level of performance. It’s not clear which MD-011 he is using, but it is a pretty good bet it will also hold that level as well. The usual disclaimers about good satellite view for the GPSDO’s would of course apply.
Substituting a typical telecom Rb for either device would likely also allow the wiggles to be observed (or not). That would take out the whole dependence on GPS. (Yes I realize those comments are probably better directed to those involved ….). Bob > On Apr 24, 2020, at 6:52 AM, David J Taylor via time-nuts > <[email protected]> wrote: > > From: Karen Tadevosyan via time-nuts > > Hi, > > one of the interesting HAM radio topic in Europe now is the use of the new > geostationary satellite Phase-4A (QO-100) for analog and digital modes via a > 2.4/10 GHz transponder. > [] > ======================================= > > ... and Time-Nuts may be interested in some oscillator measurements made by > Daniel Estévez showing some unexpected steps. His blog is here: > > https://destevez.net/2020/04/wiggles-in-the-qo-100-local-oscillator/ > > It's a fascinating story, and may not yet be complete. > > Daniel is a GNSS Engineer by occupation. > > Cheers, > David GM8ARV > -- > SatSignal Software - Quality software for you > Web: http://www.satsignal.eu > Email: [email protected] > Twitter: @gm8arv > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
