Futaba pcm receiver difference
 

I'm curious about the differences between the 129DP and 138DP and also the 149DP receivers. Will they all work equally well with the various Futaba pcm transmitters (disregarding the number of channels available). I'm wondering if the 129DP model is better suited to the 9V 9Z series of transmitters (realizing they came with such receiver models) and if there is any benefit, or risk, signal to noise ratio etc,.. to opt for the newer 138DP and 149DP models Also I see the newer receivers come in low and high band flavors :) this would indicate that earlier models might have been tuned to mid channels and not be as good near the top or bottom. Any clarification would be appreciated.