>Currently, I use xtals that are about 20ppm (and use software
>cal) but haven't had any information back regarding the cost
>differential between the <5ppm and 20ppm xtals - do you think
>the cost would be prohibitive?

I suspect you would be better off doing a software calibration using Roman
Blacks "exact second" method. Don't have a pointer to it, and never used it,
but those here who have tried it claim it to be excellent. Not sure why it
hasn't been mentioned already.

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