Carsten, are you ready for a nutty suggestion? On the Futaba TX's trainer mode, you can select which channels are passed to the slave (student) transmitter, and which stay with the master. I used this when I was teaching my younger son to fly RC, first he just got rudder, then rudder and elevator, then throttle .. it was an interesting way to teach.

Anyway, suppose you set the trainer up so that almost all the channels stay with the master, and only some of the "aux" channels are passed to the student .. but instead of the student transmitter, you make a dummy TX interface that allows the ASSI telemetry unit to send channels as if they were the student transmitter. Presto, you now have the ability to pass actual control info into the master TX, mix with the main channels flying and controlling the jet.

In this case you'd put the trainer switch on a non-momentary and essentially by flying the entire flight in "student mode" .. but with the primary channels all held in the master TX and the "aux" channels coming from the ASSI unit.

Anyway, just a crazy thought. You know they have a wireless trainer interface too... hmm..

:-)

Dave