Hi Does the synchronous filter on the PWM still have a sample and hold in it, or has somebody come up with a different approach?
Bob On Dec 5, 2012, at 3:06 AM, Bruce Griffiths <[email protected]> wrote: > Hal Murray wrote: >> [email protected] said: >> >>> What is the simplest phase detecter that could work? I think only that, and >>> then a duouble oven crystal from eBay, a GPS and and Arduido. >>> >> You also need a good D2A to drive the EFC on the osc. >> >> >> > A synchronous filter of a suitably level translated (CMOS analog switch plus > low noise reference) PWM output should work well. >>> Yes the Aruino is expensive compared to a bare uP chip but using one, I thin >>> you could build a GPSDO without a PCB and the Arduino's USB connection could >>> be usful for power and logging/control. >>> >> I wouldn't want to power a GPSDO from USB. It will get power cycled every >> time I need to work on the logging PC. Besides, you only get 2.5 watts. The >> oven will probably take more than that during warm-up. >> >> >> > Bruce > > _______________________________________________ > 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.
