[time-nuts] Chelsea Chronoquartz dividers

[Tom Van Baak]

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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