I'll type in a few quick notes now; I'll try to borrow my friend's 9x, take some pictures and maybe a video of trainer mode in action.
- We'll use "teacher" and "student" here; The other common terms for this are "master" and "slave".
- The teacher radio is in contact with the plane.
- The two radios are attached with a 1/8 inch mono male-male jack. Student radio turns on automatically when attached.
- In new model 9x's (the ones with a single antenna), there is a circuitry problem that blocks the trainer port.
- The simple way to fix this problem is to pop the module out. The antenna connection is soldered to the main board, so be a little bit careful. You have 2-3 cm of loose antenna wire.
- With the module disconnected, the trainer port is active. I think it's ok to operate in this mode, just tape the module so it doesn't fall out and break the antenna wire.
- Another solution, but more work, is to solder a resistor into the circuit. I have not tried this yet, but have my notes on this page.
- Turn on trainer channels [menu / func setting / trainer].
- You can turn on all controls or just some. It might be useful for teacher to keep control of the throttle, for example.
- The settings are confusing. I will probably make a video, but I think you want to set Off/On mode. When in that menu, pull the trainer switch and you should see the mode switch.
- In most radios, you pull the trainer switch to allow student control, and let go of trainer switch for teacher to control.
- Turnigy 9x is opposite! Must hold trainer switch for teacher to control. Use this method for mechanical reverse.
- Eject the module from student radio. Tape it down so it doesn't break antenna wire.
- Make sure "Reverse" has same settings on both radios. [menu/func setting/reverse].
- Set trainer mode on teacher radio.
- Attach mono cable to both radios.
- Test all controls to see if reverse is correct on both radios.