When I first recieved my DX3S with telemetry I was using the SR3300T. The range is about half that of it's half price cousin the SR300. I made the switch in all my cars. Then I noticed that when I put my transponder in the radio box of my NTC3 it would lose range and "go crazy" even at short distances. I got the transponder away from it and haven't had a problem since.