> This is just a small remote piloted camera housing that I am helping 
> my
> son and grandson build as a hobby project. We are trying to do it on 
> a
> low budget.  If we had $6,000 USD we could go out and buy a used 
> one.

>From what I've seen so far ...

This should work OK at moderate distances using a single pair of wires 
with ground on one wire and signal on the other. Actually attempting 
to match to it as an unbalanced transmission line may help, but 
chances are just connecting directly would work. As someone mentioned, 
attenuation (2 resistors) may be needed.)

However, you MAY be able to get a more consistently workable result by 
feeding and receiving the modulation signal that is used to drive the 
transmitter. This does take more effort than just using the tx/rx 
directly. The transmitter will be "keyed" by a signal, quite probably 
at 5 volts, and this signal will be reconstituted by the receiver. 
Eliminating the RF "middleman" allows you to use a single pair at 
pulse rates in the (probably) 10's of kbps range and eliminates RF 
considerations.

If I was in your position I try it with the 1 wire and a pair of wires 
with RF to see what happens and go from there. Odds are you can get 
enough signal by wrapping a few turns of an insulated wire around the 
tx antenna or similar fairly "loose" coupling.

You talk about RC control but say its controlling a camera. If there 
is a returned video signal (maybe there isn't) then it's going to get 
more complex but a wire pair solution and RF should still be able to 
be made to work over moderate distances.



        Russell


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