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, [email protected] 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 -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
