[time-nuts] Spectracom 8170 -> SWCC clock #2

paul swed paulswedb at gmail.com
Sun Jan 22 14:57:44 EST 2012


Guess I simply did not read enough threads I see the pix.
Thanks

On Sat, Jan 21, 2012 at 9:42 PM, Brooke Clarke <brooke at pacific.net> wrote:

> Hi again:
>
> 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 snappy.
>
> I think a simple blocking oscillator could be used to charge up a photo
> cap and dump it into one or more series connected clocks.
> http://www.prc68.com/I/SWCC.**shtml <http://www.prc68.com/I/SWCC.shtml>
> http://www.prc68.com/I/SWCC2.**shtml <http://www.prc68.com/I/SWCC2.shtml>
> http://www.prc68.com/I/SETSC.**shtml#IMP2<http://www.prc68.com/I/SETSC.shtml#IMP2>
> http://www.prc68.com/I/SWCC.**shtml#L<http://www.prc68.com/I/SWCC.shtml#L>
>
> Have Fun,
>
> Brooke Clarke
> http://www.PRC68.com
> http://www.**end2partygovernment.com/**Brooke4Congress.html<http://www.end2partygovernment.com/Brooke4Congress.html>
>
>
> 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 clocks.
>> 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
>> http://www.PRC68.com
>> http://www.**end2partygovernment.com/**Brooke4Congress.html<http://www.end2partygovernment.com/Brooke4Congress.html>
>>
>>
>> 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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