[time-nuts] GPSDO Alternatives

Chris Albertson albertson.chris at gmail.com
Thu Dec 6 09:06:00 UTC 2012

Yes.   The idea was the simplest GPSDO that can be build with no PCB around
an Arduino.  We already know how to build compllelx and expensive GPSDO.
 That is "too easy".

I think you can use the PWM DAC on the Aruino to drive the OCXO.  The
bandwidth of this signal is "way low" so you can filter the PWM output with
a (say) 1Hz low pass filter.

On Wed, Dec 5, 2012 at 4:57 AM, Jim Lux <jimlux at earthlink.net> wrote:

> On 12/5/12 12:06 AM, Bruce Griffiths 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.
> True.. but I think the OP was wanting something that doesn't require
> designing a circuit and building it.


Chris Albertson
Redondo Beach, California

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