>>I doubt that it's sending resistance through the cable. Most likely it's
>>encoded
>>pulsetrain output, which gets switched in or out by the master box.
>>
>
>Well, I must admit to not knowing, but what I do know is that the trainer
>box (the one that the student is holding) is turned off when in use, and
>doesn't even need to have a battery in it. So, unless power is being sent
>from the active transmitter over the cable to run the PWM electronics in
>the buddy box, the only alternative that I can think of would be to have
>the resistance sent over the cable, so to speak.


Assuming it's a voltage per wire, then you'd need a 10 conductor cable, at a
minimum. 8 channels, plus power and ground.  If they send the pulse train
across, then you'd only need three wires..

How many wires in your buddy cable?