Is the thermal noise generated in the loss in a quartz resonator a significant part of the overall phase noise picture? I would have not thought so. I'd think that a greater benefit ought to be derived from chilling the other parts in the oscillator, such as the active devices. Unless, of course, chilling the quartz actually improves the Q significantly, which I don't know about.
If cooling (whatever) by just a modest amount helps much, then one could consider using Peltier cooling. It doesn't really get things very cold, but is a lot more convenient than either dry ice or LN2. But then you don't get the fun that you do when playing with LN2, either. Dana On Mon, Apr 2, 2018 at 2:46 PM, Tom Van Baak <[email protected]> wrote: > Has anyone tried running a quartz oscillator at liquid nitrogen > temperatures: -196 C (-321F, 77K)? It's probably impractical commercially, > but maybe something of value to a time nut. Would that dramatically lower > temperature improve phase noise & short-term performance? Is there a > crystal cut that could be optimized for 77 K instead of ~25 C (room) or 60 > C (oven)? > > If not Nitrogen, how about dry ice (-109F -78C)? > > /tvb > > _______________________________________________ > 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. > _______________________________________________ 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.
