[time-nuts] GPSDO Alternatives

Bob Camp lists at rtty.us
Wed Dec 5 12:29:02 UTC 2012


Does the synchronous filter on the PWM  still have a sample and hold in it, or has somebody come up with a different approach?


On Dec 5, 2012, at 3:06 AM, Bruce Griffiths <bruce.griffiths at xtra.co.nz> wrote:

> Hal Murray wrote:
>> albertson.chris at 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
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