Royal Evo
It's actually not that difficult to check to see if another transmitter is on. All you have to do is turn yours off. I wouldn't see why it wouldn't make sense for them to program in a single frame skip to power down the RF module, and then power it back up, skipping that one frame where it would be quiet enough to detect anyone else using the channel. At 50 frames per second no one is going to miss 1 frame every 5 seconds. It would at least give you the piece of mind to know weather or not the hit you're experiancing is noise or another RC signal.