Question about Radio's
hi i am looking to get a new radio and i am looking at the Futaba 9CAPS or the Futaba 9CAFS . The frist question i have is what is the difference between PCM and FM? What are the advatages and disadvantages? Also i have heard about PCM lock out (from my understanding it locks you out so you cant control your plane) dose this happen offten and what is this? Thanks Mike