John Ackermann N8UR wrote: > John Miles wrote: > >> Phase noise generally gets better with the higher-frequency OCXOs, though. >> I think the best of all possible worlds would be a 5-MHz OCXO like the one >> you describe, being used to discipline a 10 MHz or higher-frequency part. >> >> -- john, KE5FX >> > > I'm not sure about that -- at least, the Wenzel ULNs show better noise > at small offsets for the 5 MHz than the 10 MHz versions (though the > floor is the same). > > John
Surely the fact that the product of quartz resonator Q and its resonant frequency is approximately constant has something to do with this via the Leeson effect? Higher frequency crystals tend to have lower Q and hence lower close in phase noise at a given offset this being somewhat exacerbated by the fact that the higher frequency crystal tends to have a wider resonator bandwidth. The way to improve this is to find a substance with a larger Q at a given frequency. Bruce _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
