Isn't the 4 MHz crystal near the sweet spot for one of the cuts? A dim
memory at best :-)
DJ
On 2020-09-11 11:57, Tom Van Baak wrote:
Bill,
4194304 Hz = 2^22 Hz so 22 flip-flops gets you down to 1 Hz. The
binary divider is s similar to how the Seiko Beta 21 was designed. See
[1] for an example of a clock that uses this frequency.
What's nice about the Omega Ships Chronometer shown there is that it
has a LEMO 1PPS output so one can make precise measurements of the
clock without opening it and without resorting to audio, optical,
vibration, or magnetic methods. I have one here if you have any
questions about construction, repair, or performance (measured against
GPS).
/tvb
[1]
https://en.wikipedia.org/wiki/Omega_Marine_Chronometer#4.19_MHz_Ships_Marine_Chronometer
On 9/11/2020 10:30 AM, Bill S wrote:
A friend has acquired a Chelsea Clock Company Chronoquartz which was
probably made in the 70's. He has measured the oscillator frequency at
approximately 4.194304 MHz. He wanted to know what arrangement of
dividers they used to run the 4 pole stepper motor to step seconds.
Anybody know?
Thanks,
Bill_S
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Dr. Don Latham AJ7LL
PO Box 404, Frenchtown, MT, 59834
VOX: 406-626-4304
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