Hi

You still have the "which one's right" issue. With most settling situations, 
the closest approach of the oscillators isn't what you are after. You are 
actually trying to make sure the OCXO is both on frequency and stable. A TCXO 
likely drifts a bit as the instrument warms up. That makes a decision tough. 

Bob

On Dec 9, 2012, at 5:54 PM, li...@lazygranch.com wrote:

> I don't know if this makes things easier or not, but the act of sampling 
> itself is like a mixer. If you sample one clock with the other, it would 
> produce a beat frequency. Sampling here just means a strobing a D flip flop. 
> The output will be low frequency, so the error could be measured with a uP.
> 
> This is just a variant on the decimation demodulators that were used before 
> DSPs were powerful.
> 
> 
> 
> 
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