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.
