[time-nuts] Spectracom 8170 -> SWCC clock #2
brooke at pacific.net
Sat Jan 21 21:42:00 EST 2012
Sorry sent too soon.
The time constant of the loop is L/R. By increasing R the loop runs faster.
Western Union ran the clocks from 200 Volts with a dropping resistor to get the desired current.
When driven form say 12 Volts the clock response is sluggish, but when driven from higher voltages the response is very
I think a simple blocking oscillator could be used to charge up a photo cap and dump it into one or more series
Brooke Clarke wrote:
> 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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