Why is the aerofly5 USB interface cable (stick version) not recognizing my transmitter?

In order to transmit a strong enough signal some transmitters need to use the interface adapter (oder no. #3024040).

Otherwise the interface will not work. The aerofly5 USB stick is equipped with an opto coupler at the input side .

This can have as a consequence, that a too weak signal is available for the further evaluation. The optional available adapter (order no. #3024040) provides for a sufficient large signal.