kb...@n1k.org said:
> The gotcha is that you do not have a calibrated adjustment. Put another way,
> there isn’t a perfect correlation between DAC bits and ppm. Each adjustment
> you make is subject to a bit of error. When you are trying to get within a
> ppm,  your measurements are quicker, so the larger error ( percentage of
> step) may not be as big a deal. When you get close, it is likely to become a
> big deal.  

Interesting.  Thanks.

How much does it vary from unit to unit?  How non-linear is it likely to be?  
How much does it change with temperature?

Anybody have data?

Are fancy OCXOs more linear?

These are my opinions.  I hate spam.

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