One recent student has a very old plane equipped with an AM radio. His radio has no student cord port. I provided a receiver on my channel, mounted it on top of his receiver and ran the antenna parallel to his, and stuck the servo connectors and battery connector into my receiver.

That allows use of his plane with my radio, and I furnish the student cord and transmitter. When he solos, I'll retrieve my Rx and help him hook back up.

I make my students extend the antenna on the instructor transmitter, retrieve the frequency pin and clip it on the instructor transmitter, and prepare the plane for flight. We communicate before, during and after the training session, and I fill out a report (it's a column, on a spreadsheet page) on each flight. We look at the report and see what progress the student has made, and what still needs work. The student puts the antenna down and retrieves his AMA card at the frequency board, after the session.

Good luck,
Dave Olson