Uh oh, Ken and I don't see eye to eye on something! I've got 2 transmitters and 8 receivers (only 6 in use right now). All of them are on one channel, 56. The only time I've had a conflict is when I took 1 plane to a fly in at another club. The 2 transmitters I have are a 6EXA and a 4YF. They both go to the field, but the 4YF doesn't even have a battery in it, it's used as a buddy box. The reason I only use 1 transmitter is to keep things simple and to take advantage of the features such as electronic trims and throttle cutoff. If I did have a problem with the 6EXA, 2 planes would be temporarily grounded due to using mixing for dual aileron servos. Any of the others could be flown with the 4 channel transmitter, although I would certainly miss the expo and would need to readjust the throws a bit to take them off the high rates.