Bob Fehrenbach writes:
>   a parabolic temperature curve which peaks around 25 C.



>   perhaps this is not a big deal but in many cases, temperature swings of
>   30 or more degrees are to be expected and will wreck the accuracy.

        How about a correction factor which adjusts itself based on the
temperature?  At 25 C, no correction and then increasing correction as
the temperature deviates from 25 DEG C.  I think that would be easier
and cheaper than trying to build a controlled environment for the crystal
which is your other alternative.

Martin McCormick WB5AGZ  Stillwater, OK 36.7N97.4W
OSU Center for Computing and Information Services Data Communications Group