ORIGINAL: speedy72vega
I have a DX6i TX and am teaching a buddy how to fly with a buddy cable. He has the PZ Corsair RTF that came with the DX5e. His TX must be OFF, not on when the cable is hooked up. No computerized controls on the DX5e, just High/Low rates. It works just fine.
I'm glad you guys got that to work! The DX6i's own manual states, "The transmitter can be used as a master but the slave transmitter must have the same programming (i.e. reverse, travel adjust, dual rates, mixes, sub trims, etc.) as the master."
We've been unable to get the DX6i to work with our club's two SX400 buddy boxes. I'm certain we've tried using DX6i transmitters as master boxes with DX5e transmitters as slaves before, too. I can't imagine why it works for you but we couldn't get it to work for us. It's funny that the DX5e works with no power, it shouldn't be creating a signal to send to the DX6i if it's not powered up.
One of these days, I'll have to sit down with the other instructors and a whole pile of radios and cables and sort out exactly how everything works.