It is 1 second and Corby uses his Maser, he has done many tests in the past and he has an original NBS unit and is able to go back and forth. The system is set up in such a way that you can also use .1 and .01 seconds. Bert In a message dated 11/12/2009 6:58:02 A.M. Eastern Standard Time, mfs...@gmail.com writes:
Hi Bert, * The 2E-13 you talk about is ADEV at Tau = 1s, or...? * What kind of set-up you are using to measure it? Thanks and best regards, Mario On Thu, Nov 12, 2009 at 12:13 PM, <ewkeh...@aol.com> wrote: > On our DMTD I am using Minicircuit amplifiers and the SYPD-1 phase > detector. Corby is presently testing the unit and we see about 2 E -13. Let > me > stress again I am not trying to push for the absolute best performance, my > focus is on simplicity, cost and ease to reproduce. The goal is 1 E -13. > Cost > goal of $ 200 has been achieved. That includes the five channel counter > where Richard has finished the PIC programming and modifications to the PC > boards have been implemented. Corby is looking at what it will take to get > to > the performance of the NBS unit, which is our baseline. I think this unit > will serve 99% of us well since it not only shows Alan Variance but > frequency > difference directly. Resolution is 1 E -15. > Bert Kehren > > > In a message dated 11/12/2009 1:14:08 A.M. Eastern Standard Time, > mag...@rubidium.dyndns.org writes: > > Bob Camp wrote: > > HI > > > > I have no direct experience with the Minicircuits "active mixers", but I > > have used some of their amplifier chips. I suspect they use their own > amps. > > Or at least the same amps. > > > The amps I worked with had significant phase noise issues when driven > > within 6db of their 1db compression point. They were "ok" at low drive > > levels. More or less then went from 3 db noise figure to a > 20 db nf as > > you went from -20 dbm to 0 dbm output on a +7 dbm amplifier. > > Uhm, that sounds more like distorsion than noise. Anyway, if it is the > same amps, then that would exclude them from being suitable for driving > the mixer to saturation. Thanks for the report. > > Cheers, > Magnus > > _______________________________________________ > 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.
