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.
