[time-nuts] GPSDO Alternatives
Bob Camp
lists at rtty.us
Wed Dec 5 12:29:02 UTC 2012
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.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
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
More information about the time-nuts
mailing list