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.gra...@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 <w...@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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