I am working to build a small DMTD system based on Bill Riley’s paper. Bill was kind enough to send me a package with updates. In the meantime, I tested an AD8302 phase detector coupled to an HP voltmeter (HP3456 and HP3457), both with the filter set. I believe the HP3456A voltmeter filter limits voltage changes to below 60hz. The results were interesting but I don’t have anything to compare them with though they did look correct from a relative standpoint. For instance, my Cs beam looked better than one Rb unit and my GPSDOs looked better at longer Tau. My HP 10811 looked correct when compared to others.
The issue with the AD8302 though is that phase deltas below 3 degrees are inaccurate, actually the plots had flats at those phase deltas. Also, since it reports in degrees, you need to change that back to time which I did in a spreadsheet. Regards, Jerry Jerry Hancock [email protected] (415) 215-3779 > On Jan 16, 2018, at 8:58 AM, slawek dabrowski <[email protected]> wrote: > > > Hello to the group! > > Have you ever measured frequency standard (or other precision oscillator) > simultanously by time interval method (difference between 1 pps ref and 1 pps > DUT) and dual mixer method (e.q. with phase/frequency comparator)? I'm very > interested in results. > > Slawek > > > > > > > _______________________________________________ > 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.
