Joseph M Gwinn wrote: >> It may be better (aside from costs) to just use a very large sapphire >> whispering gallery resonator. >> > > A higher frequency could be an advantage in the "crystal" oscillator of a > Rb oscillator. One can then divide the higher frequency down to 10 MHz, > perhaps improving phase noise in the process. > > I suppose a SAW could be made of sapphire, if it's piezeoelectric enough. > > Joe > > > >> Bruce >> >> Joe
Saphire isnt piezoelectric. The idea being that there may be some advantage in not using an acoustic wave resonator but a microwave resonator with extremely high Q (at least at Liquid helium temperatures). However the cost will usually be prohibitive. Cryogenic sapphire whispering gallery resonators are known to have greater short term stabilities that even the best crystal oscillator. 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.
