I found one of these at a hamfest, it's a small box with 2 controls on the
front and on the back there are 2 RCA phono sockets, a 12VDC connector and a
SO 239. The 239 is labelled EXT. MODULE so I assume there's another part or
two for this set and I wonder what they are. Any info appreciated.
tnx

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73
Hank WD5JFR