mr 67 stang is right about not needing a computer radio for a ucd 46. the 4 channel you have will run these basic airplanes well. The time to start thinking about computer radios is when you start having multiple airplanes ready to fly in your stable. Having one computer radio that can run all your planes and remember there trim settings and servo reverses is very convenient. Also it will save you the embarrasement of bringing the wrong four channel radio for the plane you have. Before you buy a computer radio you have to consider what type of flying you will be getting into. If you are going to be flying aircraft like trainers or small to medium pattern flyers the radios like a 6exa or 7c will do you fine. For larger aircraft or aircraft with more complicated setups like split elevator servos or dual rates on three surfaces, a radio like a 9c would be the most basic radio you would need. Its a lot better to buy a little more then you need for a little more then have to buy another system to replace an insufficient one. Sorry I have not mentioned Jr or the other systems but I am not as familiar with them.