Bob, I seem to remember reading in the manual on the PRS-10 where they expounded at length about how they took great pains to make the unit work well with typical noisy GPS PPS input.
I'm using a CNS Clock II as my primary GPSDO, checking phase slippage with respect to my PRS-10 to make decisions about when (or when not) to manually tweak the PRS-10. The CNS seems awfully noisy to me, even though the mfr says that it has strong hanging bridge correction. I run the two 10 MHz signals through a quadrature demodulator whose I & Q outputs go into a 2-channel DSO running in extremely low "roll mode". I take a glance at it several times per day, with each glance showing me the most recent ~4-hour history. When I do tweak, I strive to set the PRS-10 about 1E-11 low in frequency, which yields a couple of months of hands-off operation before it drifts to 1E-11 on the high side. For now, that has to suffice. But I'd rather not have to pay so much attention to it, which is why I dream about buying a new PRS-10 with PPS locking capability. Dana On Thu, Nov 18, 2021 at 8:47 AM Poul-Henning Kamp <[email protected]> wrote: > -------- > Bob kb8tq writes: > > > The 'filter' in the PRS-10 is not really set up for a GPS sort of signal. > > It is particularly bad at handling GPS's because of the "hanging bridge" > phenomena, and the better the GPS, the worse the result... > > I tried injecting the "negative sawtooth" via the serial port to my > PRS10 but firmware features/bugs prevented that. > > The offset could only be changed permanently in the saved configuration, > you could not change the running value on a second to second basis. > > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > [email protected] | TCP/IP since RFC 956 > FreeBSD committer | BSD since 4.3-tahoe > Never attribute to malice what can adequately be explained by incompetence. > _______________________________________________ > time-nuts mailing list -- [email protected] -- To unsubscribe send > an email to [email protected] > To unsubscribe, go to and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] -- To unsubscribe send an email to [email protected] To unsubscribe, go to and follow the instructions there.
