RE: Question about Radio's
To expand on one point. Lockout refers to PCM where if a signal is lost the servo's do nothing until Fail Safe kicks in where they either stay put or go to a pre-programmed position.
In an FM system they may move unpredicitibly making things worse. Some people prefer to "fly through" the interference with some control as opposed to pcm where they just stay put till the reciever gets x number of good frames again.
Glad to have helped.