It might be easier to go the other away around... take a GPS receiver with a
programmable output frequency and set it to produce 32768 KHz. The Venus
timing receivers can produce accurate output frequencies (but with a fair
amount of jitter, which would be irrelevant to a clock display).
I think that the Venus timing receivers use a factional N divisor scheme that
can produce exactly 32768 Hz from the 120 MHz processor clock. Other receivers
with programmable outputs may or may not be able to. Nick Sayer has a Venus
timing module for around $40 The $6 NavSpark Mini receivers also use a Venus
chip with a programmable output, but I don't know if their frequency generator
is as fancy as the timing receiver. I'd check mine, but my frequency counters
are all tied up for quite a while.
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