Dont worry about it, RT will come eventually until it does share the RT calls with the nice instructor who sits in the right seat. I had real problems with RT until I got a special PTT switch but I have a really understanding instructor who helps. It was so frustrating knowing what to say but not being able to because pushing the button as the drop of a hat wasnt possible so somone else always got in before you managed to connect. Thankfully that diffuculty has gone now.