One simple way of doing this without risking your servos or someone else's plane is to pick up a RX which is auto-shifting (I know the MX-6800 from MPI is one, although it is a low range rx, but I know I have seen some others like some from FMA that are full range), an extra rx battery pack, and a $20 plane locator (the ones that start beeping when you turn off your TX)... Just turn on this combo before your TX and if you don't hear beeping then it means there is someone else on your channel; hear beeping and you are good to go. I have used this method before and once it actually saved my friend's plane (he had changed planes/TX/channel while I was working on a plane and we were at a slope w/o freq pins); I would have hated to be the one to cause the destruction of his new plane.) JME, Daniel
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