ok - another noob question then. if i use a Y harness do i install the servos in opposite directions or does the harness itself reverse the signal (i.e. how do the servos know they have to move in different directions)?

also, re: the pcm vs. ppm thing. do you mean that either the 9caf or the 9cap can transmit a pcm signal but only the 9cap has the failsafe feature (which i understand can be a good or bad thing depending on what the plane is doing when you lose the signal etc.)? if that's the case does that mean the 9caf can work with a the r149 pcm receiver?