[GreenKeys] Model 15 KSR

Sat, 9 Feb 2002 21:25:37 -0600

        There were two types of selector systems.  The Holding magnet
selector basically had the armature pushed up against the magnet face by
a cam, and if the magnet was energized, it held the aramture.  The other
was the pulling magnet selector that attracted the aramture more or less
like a relay 

        Regarding polar relays, there were many applications where no
relay was used.   The polar relay was really needed only if the machine
was working on a long wire line circuit - and these were usually POLAR,
meaning that the polarity was reversed to create the mark/space
transitions.   Bottom line was the selector magnet was still an on/off
operation.


Frank KF9NZ

On Sat, 09 Feb 2002 21:48:28 -0500 Jeff Seidel <[email protected]>
writes:
> Hello all,
> 
> Im looking for some information on a Model 15KSR  I just picked up 
> today.
> 
> I first noticed the unit does not have a polar relay unit on it and 
> also I see the
> selector and magnets look quite different than the ones on my Model 
> 19 set.  There
> is also no Line/Test switch on it.
> 
> Were there Model 15's with older style selectors and did they use 
> them without the
> polar relays?  Being a novice at this I only know what Ive seen on 
> my Model 19
> set.
> 
> Thanks Much
> Jeff
> 
> 
> --
> Email   Jeff Seidel    [email protected]
> See my railroad signaling pages at:  http://railroad-signaling.com
> 
> 
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> 
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