[time-nuts] Spectracom 8170 -> SWCC clock

Brooke Clarke brooke at pacific.net
Sat Jan 21 21:25:29 EST 2012

Hi Jim:

There are a number of options.

Ken's clock clinic sells what appears to be a No. 6 Battery that has a synchronization function for the Western Union 
But the problem with it and the drivers for slave clocks is that they use fairly low voltage circuitry.

Stock Tickers and Teletype machines are tpically run with loop voltages in the 60 to 200 Volt range.

Have Fun,

Brooke Clarke

Jim Hickstein wrote:
> I have a Spectracom 8170 in the living room (who doesn't?), and a Western Union time-service clock, a.k.a SWCC clock 
> -- a nice one, in a 3-foot-high wood case.  I've been watching TV with this combination for years and years but never 
> got around to feeding a pulse from the 8170 to discipline the other one. Now that Western Union no longer provides the 
> service. :-)  But it just begs to be done.
> I did draw up a TTL circuit, once (on a napkin, naturally, which I have now misplaced), that could live inside the 
> 8170.  I figured out the minimum number of inputs needed to detect when the MM:SS LED displays said 00:00 (for one 
> second).  It would close a relay, which could feed the winding-battery power to the hour-set solenoid down a pair of 
> wires from 10 feet away.  But I never built it.
> A little over a year ago the TS clock was getting gummy and free-running slower and slower, so I sent it to the clock 
> hospital.  It's back and free-running nicely, so maybe it's finally time I did this.  Anyone got a better idea than my 
> little TTL circuit, on a breadboard inside the 8170?  I'd like to get it across the rear panel without cutting a new 
> hole, if I can avoid it.  But maybe the right connector would do.  Another time-code receiver in the TS clock, e.g. a 
> GPS module that provides a relay closure for 1 second on the hour (if such exists) might be neater.  But the living 
> room faces north.
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