Good morning: I have a couple of questions. 1. What is the difference between a Futaba R168DF recever, and Futaba FP-R127DF and Futaba 1024 FP-R129DP. Now i know that 1 of them are 8 channel, and one is 7 channel and 1 is a 9 channel is a Pulse code modulation system. Now is one better than the other. is there a difference in the receiving range.