Mine works so far. I am using a JR X347 and a JR Circus 6. I wish I knew how these mini plugs work. The jack on/in transmitter may be a on and off switch as well. I do not turn on the radio at all when connected to sim. I have taken the modual out of the back of the X347 and then the battery will last a lot longer. I do not like unpluging it everytime....I do not want to wear out the connector. Most the time I leave modual in. Its good to recycle the battery anyway. Mayby Danny on the JR site may know whts best to do. Good Luck Capt,n