[Heathkit] SA-5010 outboard paddle help

[Dave Thompson]

Hello,

I have a Heathkit uMatic automatic keyer Model SA-5010.  I finally found it was iambic "like" per the manual.

I wanted to hook up a Vibroplex key paddle to the keyer but the only input to the keyer is an RCA jack on the rear.  Iambic requires a 3 wire hook up and I have a 3 wire stereo plug that I use with other keyers. I looked in the manual but get little help.

How do you wire up a Vibroplex paddle to a 2 wire RCA jack?

Thanks in advance.

73 Dave K4JRB