An obvious solution would be to use a second transmitter/ receiver system on a different frequency. At our field, this is not a viable solution because only a limited number of units are allowed to be airborne at the same time. Most RC systems have a trainer connection on the transmitter. Two transmitters are connected via this umbilical cord. The student's transmitter provides only the modulating signal to the main transmitter. A switch on the main transmitter allows the instructor to connect or disconnect the trainee.
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