[time-nuts] GPSDO Alternatives

Jim Lux jimlux at earthlink.net
Thu Dec 6 13:56:08 UTC 2012

On 12/6/12 1:06 AM, Chris Albertson wrote:
> 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.

I would worry about how you'd build that filter to be low noise AND 
suitably filter the PWM output so that there's no leakage of the PWM 
modulation.  Seems it would be easier to hook up a serial interface DAC 
with lots of bits than fool with filters..


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