NX

From User HarperPhoenix on Discord Hey, just getting back to you about the nx series of transmitters. They do need a trainer adapter, it fixed my problem completely. The audio jack in the back of the transmitter is a headphone port. To fix the problem NX transmitter owners need this part. https://www.horizonhobby.com/product/wired-trainer-adapter-ix-and-nx-transmitters/SPMA3091.html.