While you're at it, add an ATMEGA328 processor and a 250 ps res/256 step delay
line. The processor reads the timing message, picks off the sawtooth
correction factor, converts it to an 8-bit value that it output on a port to
the delay line. The 1PPS signal clocks the port into the delay line for
sawtooth correction. (This all assumes that the correction factor applies to
the NEXT 1PPS that is output (the PPS correction is not documented... the time
field in the message applies to the previous 1PPS pulse).
Another useful feature might be a fan driver FET controlled by the computer RTS
and DTR lines. That way Lady Heather can do the temperature control thing...
RTS is enable, DTR is heat/cool. Since a fan only cools, you could skip
using the RTS signal.
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