> Time-nuts > > I appreciate the comments regarding horological obsession. Mine started with > a desire for an accurate master > oscillator for my ham shack (built and use a couple Shera GPSDO's) and has > blossomed into a much broader interest > in time (Ex tempus, sapientia?) > > This has led me to a silly quest. I'd like to use a traditional clock face > and hands as an output device for a > 1PPS signal from my GPSDO. > > I know this is a very broad question, but does anyone have advice on where I > might start hacking (or making) a > mechanical clock face to accomplish this? Is there a simple clock design that > I could start with to build my own? > Maybe replacing a pendulum or escapement with a solenoid? Any examples to > work from? > > Mark
This is one reason the older model HP 5065A and 5061A with Patek analog clocks are so desirable; they pre-date LED, LCD, or VFD clock displays. But one easy way to do it today is start with a $5 standard quartz clock display. 1) Either run a precise synthesized 32 kHz signal into it (replacing the xtal), or drive the little bipolar stepper yourself. A 50 millisecond +1.5 VDC pulse is all you need; next second give it a -1.5 VDC pulse, etc. This is a few lines of code for a microcontroller. I've got pictures of this somewhere on my web site, I think. See also Bryan's cool stuff at: http://www.bmumford.com/clocks/emindex.html Some of us have driven traditional pendulum clocks with GPS or atomic 1PPS. Another cute one is to take an old Western Union, US Naval Observatory, SWCC (Self-winding Clock Company) clocks and sync them using a GPS-divided 1PPH (one pulse per hour) pulse. See Mitchell's SWCC page at: http://www.telechron.com/ Also, here's what "USNO time" meant in the 1930's... http://www.leapsecond.com/history/usno.htm /tvb _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
