[GreenKeys] A little Kleinschmidt help needed

[Duncan Brown]

Bruce,

The KLI TT-4 used spring bias, but all the other KLI units after that 
used electrical bias (electromagnet plus permanent magnet).

Just reverse the leads, or use a bridge rectifier.  The Mite machines 
used a bridge on their loop input to get away from being polarity sensitive.

Have fun,

Duncan
K2OEQ


On 21-Nov-17 23:52, Bruce Gentry wrote:
> I am working on getting a radio hut with Collins URG equipment in it 
> working. The TTY gear is all Kleinschmidt- a KSR, TD, and reperf. They 
> all work but certainly need cleaning and oiling. The KSR, however, is 
> sensitive to the polarity of the loop current. The selector magnets 
> use a permanent magnet instead of a spring, so the wrong polarity will 
> cause the printer to "run open" even with current flowing. Is there 
> any setup or adjustmen that will allow the loop current to flow in 
> either direction, like a model 15 or 28? Is there a selector magnet 
> available using a spring instead of the magnet?
>
>      Bruce Gentry, KA2IVY
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