Woody_100,

I think you're going to have to live with the "snatch and grab" method of instruction. Even if the instructor is on the same channel as you, the airplane will not know whose transmitter to listen to (yours or the instructors)... as for putting your crystal (I assume you're talking about TX crystal here) in the instructor's TX...that MAY be possible but is considered a definite no-no as it would entail having the TX retuned.(BTW, there are some Tx's out there that can have their freq. changed by the user..) There are some people who have done the crystal swap thing, but from what I've read you run the risk of decreased range...

Hope this helps