Duster_360: That's what I'm thinking. In the days of single or double sided pcbs it was fairly easy to trace the tracks and break into the board. Then I could use a cheap two channel set and wire in my own encoder/decoder electronics; problem solved.

I suspect that things are different nowadays with very high density multilayer surface mount boards making that hard work. But like I said it's been a long while since I saw a rc radio set so I just don't know -I was hoping for info from those who use them now.