No, the Thunderbolt does it and it works beatutifully. The GPS receiver
clock is derived from the 10 MHz oscillator. Voila, no messy sawtooth
corrections to deal with.
The Thunderbolt is a VERY user/hacker friendly design. Even if I were silly
enough to build my own GPSDO, I'd still use a Thunderbolt as a base. It has
the EFC dac, phase comparator, and temperature monitoring already implemented.
Plus no sawtooth correction crap to handle. You can control the DAC manually
and implement your own control loop. Opps, siilly me, been there, done
that. Lady Heather does have an implementation of an alternate disciplining
algorithm in it.
----------------------
I assume there is a design compromise that prevents economically phase
locking the GPS receiver clock to the GPS signal to remove that
contribution to timing error.
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