A friend of mine sets watches this way, except that he slips the
watch into a coil connected to his HP-3586B SLM receiver. This seems
to work even with metal cased watches.
Burt, K6OQK
At 07:57 AM 9/9/2020, you wrote:
The 32768 Hz crystal oscillator can be received, amplified, and
filtered outside the watch as described here:
http://charliethompson.50megs.com/quartz.html
I actually tried this once, and it worked quite well on every watch
and clock I could get my hands on at the time.
The first three transistors form an amplifier with around 100 dB of
gain. The crystal filter is required to remove the broadband noise
generated by the amplifier.
I didn't include the final two transistor "squaring" output stage
because I was interested in having a sinusoidal output to view on a scope.
73.000 de John, KD2BD
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Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California U.S.A.
b...@att.net
K6OQK
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