Hi ….. any bets on it being a triple oven? :)
Bob On Sep 30, 2012, at 1:26 PM, Tom Knox <act...@hotmail.com> wrote: > > Rick it is really fantastic to see Time Nuts occasionally discuse different > aspects of products they actually designed. This form is really a treasure. > In the future it would be interesting to here how you would approach the next > quartz industry standard. The next generation Blue-Top or BVA. > Thanks; > Thomas Knox > > > >> Date: Sun, 30 Sep 2012 10:03:03 -0700 >> From: rich...@karlquist.com >> To: time-nuts@febo.com >> Subject: Re: [time-nuts] E1938A PN measurments >> >> I recently modified an old 10811 to bring out the crystal >> leads on miniature coax (instead of having them connect >> to the oscillator circuit). This allowed me to measure >> the crystal's inherent flicker noise of frequency. >> The measurements indicate that the 10811 phase noise out >> to at least 100 Hz is entirely due to the crystal. >> An interesting aspect of flicker noise of frequency >> is that Allan deviation is independent of tau. Thus, >> just one number describes the crystal noise. >> >> Rick >> >> On 9/30/2012 4:44 AM, Bob Camp wrote: >>> Hi >>> >>> Close in, it looks like it's pretty much the crystal and the loading of the >>> bridge oscillator. >>> >>> Bob >>> >>> On Sep 29, 2012, at 11:46 PM, Richard (Rick) Karlquist >>> <rich...@karlquist.com> wrote: >>> >>>> The E1938A uses a crystal that is basically the same as >>>> the 10811 crystal except that it is in a reduced height >>>> package. However the phase noise is not as good as a >>>> 10811 due to broadband noise in the automatic frequency >>>> control circuit. By the time I discovered this, it >>>> was too late to try to fix it. >>>> >>>> Rick Karlquist N6RK >>>> E1938A designer >>>> >>>> _______________________________________________ >>>> 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. >>> >>> >> >> _______________________________________________ >> 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. _______________________________________________ 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.