[time-nuts] Thought experiment on a low cost timing board

Alberto di Bene dibene at usa.net
Sat Feb 25 09:37:02 EST 2006


Arnold Tibus wrote:

> Unfortunately there is only the hex list of the pic code. 
> As I would like to experiment as well with this modification 
> and try to change some parameters to fit my LPRO 
> and some different OCXOs I own, 
> is there a way to get the commented source code of it? 
> 

I designed and implemented a couple of years ago a GPSDO along the
conceptual lines of that of Brooks Shera, but with a different
processor (an AVR ATmel AT90S8535) and using a 20 bit PWM instead
of the DAC (difficult to obtain). It kept the OCXO disciplined
in a few parts over 10^11, confirmed also by comparisons against
a Z3801A.

If you want the source code of my AVR program (assembly language)
just ask.

73  Alberto  I2PHD




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