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It might be that you need to change some settings on the transmitter itself. I found this info on another forum:

"For Futaba 18SZ - You'll need to configure the Trainer Port function;
Linkage menu > Trainer 
ACT/INH - ACT
Teacher/Student - Student
Channel mode - 8 Ch

Both stereo and mono adapter cables appear to work with the Futaba trainer port, however caution is required here. A correctly wired adapter when installed turns the Futaba 18SZ and 14SG on. "

Source and more information: https://steamcommunity.com/app/410340/discussions/1/359543951733047725/