Just got a note back from a tech at Horizon (Spektrum) and he said none of their current radios will bind to the old DSM receivers. Guess it's a "luck of the draw" thing. Too bad because I have several old Spektrun DSM receivers and wanted to get a new Spektrum radio and upgrade receivers 1 at a time as I can't afford to do them all at once. Since that wont work according to Spektrum, I guess I'll have to jump ship and go with a futaba since I'll have to get all new receivers anyway.