Guess what?

I went and checked my old, not used anymore but fully operational, Airtronics Championship Series Tx and sure enough - at the back it has a DSC (direct servo control) port.
So, I checked the manual, and that said it should be connected with a cable to the Rx switch harness charge plug.
Next, it says to switch the Rx on but not the Tx.
So I guess the ground and signal go through the lines? since the charge plug is only 2-pins.
Would it work also with 60-65 ft lines or would the resistance be too great?

And one more question for all you experts who may be using such a system - how do you get around the Human Engineering issue?
I mean having a switch or two added to a standard handle is one thing, but how do you operate a CL handle, and a full size RC Tx? doyou hang it on a belt? and how do you operate it? it's tempting to have 6 channels this way, I just don't see how do you exactly operate with it...