Hi The paper mentions HC-40 crystals. They probably have the crystal drive current cranked down to optimize short term stability at 1 sec and longer. The phase noise floor takes a back seat.
The other interesting thing in the paper is that the short term numbers shown aren't into parts in the 13th. Bob On Feb 25, 2012, at 9:11 PM, "John Miles" <jmi...@pop.net> wrote: >> Are the specs at 5 MHz or at 10? They should be 6 db worse at 10 than at > 5. > > Now that I'm looking back at the data sheet posted with the auction, they > were indeed specified at 5 MHz. But even after the 6 dB penalty, their spec > limits versus their real-world numbers are pretty marginal. > > Morion actually announced this particular oscillator at IFCS 2002, so > there's a paper of sorts: > http://www.ke5fx.com/Morion_MV89A_IEEE_IFCS_2002.pdf . Figure 4 was taken > from a 10 MHz part, but all three of the ones I've tested look like the > attached. Same as figure 4 until about 200 Hz... then they never go any > lower. > > -- john > > <mv89a_pn.png> > _______________________________________________ > 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.
