); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] I am very happy to hear you did this already. Impressive.
Is there a prototype I could test here in my lab? I'd be very interested in measuring it. I hope to finish testing a dozen or more GPSDO this year; would like to have something this simple in the mix. /tvb ----- Original Message ----- From: "Richard H McCorkle" <[EMAIL PROTECTED]> > Tom, > I did most of the software development work using just the > uncorrected 1PPS into TMR0 and two scaled and summed PWM > outputs instead of a DAC, and the results were surprizingly > good. It made a very low cost, small footprint design without > the external counters and DAC. All the added extras since are > just part of my continuing education. > > Richard > ----- Original Message ----- > From: "Tom Van Baak" <[EMAIL PROTECTED]> >> >> > My original design used a 50 MHz TIC clock and the TMR0 >> > prescaler as the phase counter giving 20ns single sample resolution >> > in the prototype system. >> >> In this case how about making a super-simple GPSDO >> and just put the uncorrected 1pps directly into TMRO. >> The sawtooth jitter of an M12+ is 9 ns rms, which is just >> the magnitude you need to improve on the 20 ns single >> shot PIC-based TIC resolution. If you average long enough >> even hanging bridges will not be a concern. >> >> You'd have to do some work to get fancier, but it's hard to >> imagine a PIC-only GPSDO that would be simpler. >> >> /tvb _______________________________________________ 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.
