On Wed, November 1, 2017 3:38 pm, Hal Murray wrote: > >> In general, OCXOs have crystals with high Q -> low phase noise, >> especially >> compared to a TCXO, which *can't* have high Q, or the temperature >> compensation circuit can't do it's work. > > I don't understand that. Why can't I build a high Q TCXO?
Compensation implies pulling the frequency away from the natural resonance. High Q implies that the frequency cannot be pulled very far away from natural resonance. The two items are directly contradictory. -- Chris Caudle I don't need > to > change the compensation very fast. Are good crystals high enough Q that > it > would take too long? > > What's the time constant? I'd guess it's Q/freq, maybe with factors of > 2pi > or e or ??? > > That seems small relative to how fast temperature changes. (but maybe > fast > relative to FCC smearing or things like that) > > > -- > These are my opinions. I hate spam. > > > > _______________________________________________ > 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.