The futaba transmitters (C models) all transmit both PPM and PCM. Its the Rx that it comes with that is the factor of which you use. I like the PCM better myself for many reasons. Either will work fine for you. You can't beat the 9C, and the 7C is a close second. I wouldn't touch another airtronics radio after the common problems I have had with 4 of them. All airtronics would ever say is "isolate the problem and get back to us". I am not a tech, they needed to isolate the problem. Never had problem one with a futaba, other than putting a screw through the wires once and melting a battery and brand new Rx, and they replaced the Rx for me for the cost of shipping. Can't get any better than that. I even told them it was my fault and would pay for it. They rock!!!!