Brian, > Well, my disciplining code is going to run as an FLL rather than > a PLL to generate the correction for the OCXO or the Rb reference.
The Propeller should work fine for a GPSDO. AFAIK no one has done this yet and I encourage you to try. The Parallax Propeller chip gets mentioned on the list once a year. Being an old Basic Stamp and SX guy, I have a soft spot for the Propeller too. Do you plan an external DAC or will you obtain high resolution with some sort of PWM-only solution? Maybe we should take this off-list while the Q&A is sorted out. > Most people use a 5MHz crystal and the x16 PLL to clock the processors > at 80MHz. I have been told that the Propeller will run at 100MHz just fine. My plans were to use the Propeller for a multi-channel, higher-resolution, time/frequency counter. As such the ADEV when the internal 16x PLL is enabled is of some interest. Then again, I should stop worrying and just measure it. > I just thought that, while the PLL would have a bit more jitter, having the > extra 3 bits of resolution would be useful in accumulating the error. Yes, I would agree. The only issue I can see with the Propeller is that once you complete your GPSDO you'd have a thousand times more interested users world-wide if you had done it with an Arduino or RPi. I'm not saying the Propeller isn't a unique and interesting chip, it's just that in the past 5 years Arduino and RPi (and others) have completely taken over the hobbyist world. The holy grail would be a turn-key Arduino GPSDO shield. Or Rpi GPSDO/NTP server. Anyway, let's take this off-list. If anyone else is interested, let me know too. Thanks, /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.