Hi I was hoping somebody had worked out a way around that.
Bob -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bruce Griffiths Sent: Wednesday, December 05, 2012 12:27 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] GPSDO Alternatives A low noise sample and hold is still required. Bruce Bob Camp wrote: > 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<bruce.griffi...@xtra.co.nz> wrote: > > >> Hal Murray wrote: >> >>> albertson.ch...@gmail.com 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 -- 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. > > _______________________________________________ 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.