[time-nuts] GPSDO Alternatives

Bruce Griffiths bruce.griffiths at xtra.co.nz
Wed Dec 5 08:06:17 UTC 2012


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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