[time-nuts] Spectracom 8170 -> SWCC clock

Bob Camp lists at rtty.us
Sun Jan 22 16:29:51 EST 2012


Teletype loop current as in 20 ma through the coil via a dropping resistor off of 125 vdc.


On Jan 22, 2012, at 4:06 PM, paul swed <paulswedb at gmail.com> wrote:

> Nice pixs
> I would think that the setting winding would be of the old teletype loop
> voltage and current and that the local winding battery as mentioned would
> have been 3-6 VDC.
> Nice looking clock lucky you to find such an instrument.
> Regards
> Paul.
> On Sun, Jan 22, 2012 at 3:49 PM, Jim Hickstein <jxh at jxh.com> wrote:
>> On 2012/01/22 13:58, Jim Hickstein wrote:
>>> On 1/22/12 1:56 PM, paul swed wrote:
>>>> Yahoo for real voltage power and current. Teletype style.
>>>> Yes indeed the old loop currents seriously worked.
>>>> No AA batteries here. ;-)
>> How far will I get with my 3 D cells?  They make it wind nicely, but I've
>> been afraid to try 6V, having read somewhere (probably Brooke's pages) not
>> to exceed 3V lest one damage something.  Then again, that's the local
>> battery, not the setting signal.  (No. 6 dry cell?  Dear me, I hadn't even
>> thought of one of those for 40 years.)
>> When will we see a pix of this unit??
>>> It's my day off. :-)
>> Then again, what's a day off for, if not this kind of thing?
>> http://www.flickr.com/photos/**jxh1/tags/clock/<http://www.flickr.com/photos/jxh1/tags/clock/>
>> Brooke Clarke's pix are nice, but I think I have the nicest SWCC clock out
>> there, one of the nicest I've seen.  Coincidentally, I bought it in about
>> 1986 from a fellow named Clark (last name I don't recall), who was a member
>> of the Minnesota horological society, or whatever it's called.  A friend of
>> mine, another member, put me on to this, and I jumped at it.  (Actually, he
>> has an even nicer one, a big Air Force unit IIRC that's about 6 feet tall,
>> and with a mercury pendulum bob.)  Took the thing back home to California,
>> and it came with me when I moved back to Minnesota in 2003.  It's been the
>> primary time display in my house since I got it.  I also still keep the
>> Textronix carton I scrounged, that's a perfect fit, for moving it.
>> -Jim
>> K6JXH/0
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