[time-nuts] Chelsea Chronoquartz dividers

[Tom Van Baak]

Paul,

I'll open the Omega Quartz Chronometer and trace the circuit if you're 
curious. Many of these 70's stepper / analog clocks used Patek Philippe 
movements, the classic one you see in vintage Austron, Tracor, Sulzer, 
and, of course, hp time / frequency standards with the /001 clock option 
(e.g., 5061A, 5065A).

Yes, the drive circuit for the hp 5065A analog clock has a final 
flip-flop on the A16 board:

http://leapsecond.com/museum/patek/hp5065A-A16-Patek.jpg

The 5065A manual says: "1 PPS drive pulses connect from A5 Digital 
Divider through J1 to IC1 of the clock movement amplifier.
  IC1 provides flip-flop action and furnishes a push-pull output to 
clock amplifiers Q11 and Q12. The push-pull output of power amplifiers 
Q11 and [Q?] A12 connects to the front panel clock and is limited to 10 
V peak by zener diodes CR13 and CR14."

More eye candy:

http://leapsecond.com/museum/patek/

/tvb


On 9/11/2020 2:50 PM, paul swed wrote:
> I went looking for the clock and found nothing. But like the rest
> discovered the divider ratio to 1Hz. But does the conversation stop at that
> point? Since Bill said the motor was 4 pole wouldn't there be 1 more
> divider to .5 Hz with the Q and /Q essentially across the coil. Add
> protection diodes and such.
> It  looks like the Omega timepieces were quite nice.
> regards
> Paul
> WB8TSL
>
> On Fri, Sep 11, 2020 at 3:59 PM Graham / KE9H <ke9h.graham at gmail.com> wrote:
>
>> 2^22 = 4,194,304
>> So divide by two, 22 times in a row to get to 1 Hz.
>> --- Graham
>>
>>
>> On Fri, Sep 11, 2020 at 12:42 PM Bill S <wls at jbpet.com> 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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