Hi Chuck, since nobody else has responded here yet, I thought I'd chime in.

I'm not at all familiar with the SX600 with regard to programming. I think you might have better luck posting your question to the RC Transmitters, Receivers, and Servos forum:

http://www.rcuniverse.com/forum/forumid_157/tt.htm

You might also call Horizon Hobby customer support when you get the chance at 800-338-4639. Their technical support people should be able to help you out with radio programming issues.

The SX600 has a great reputation as a good sport radio and a good value. Good luck.