); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Tom, That version was done a few years back when I was big on recycling parts, so let me dig through my junkbox and see if I still have one around. Richard
> ); 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 -- 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.
