[time-nuts] GPSDO Alternatives
Bruce Griffiths
bruce.griffiths at xtra.co.nz
Wed Dec 5 17:27:00 UTC 2012
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.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.
>>
>
> _______________________________________________
> 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_lists.febo.com
mailing list