On Sun, Jun 11, 2017 at 9:01 PM, paul swed <paulsw...@gmail.com> wrote:
> But perhaps whats magical gold is the Patek Phillipe clock movement. Just a > guess.I hear they are quite annoying clunkers actually. I have never owned > one but a fellow in Europe was telling me you can really here them tick. > In my first job back in 1973 I inherited a lab that included what must have been an HP 100C frequency reference. It took up most of a rack and divided down a 100KHz oscillator with cascaded injection-locked 10:1 multivibrators that used metal octal-base tubes. The final frequency of 100 Hz drove a beautiful clock that made a very audible whine when it was working. This must have been an option because I don't see any reference to it in the 100C manual. At the bottom of the rack was a Hammarlund radio to tune in WWV for calibration. IIRC the clock motor also drove an adjustable cam and microswitch. The receiver's audio was fed through the switch. I think the idea was that you could accurately measure the oscillator drift by adjusting the phase of the cam until you could hear WWV's tick during the short time the switch was closed. -- --Jim Harman _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.