Basically, the term "dual conversion" means your receiver is looking at the signal twice as much as a "single conversion" The higher end JR's are also DC. If you have a 9C, either new or old, they are designed for dual conversion FM and PCM. All of the new Futaba FM receivers are DC. I have used a 9C for a couple of years and just had to send it in for overhaul. I bought a new 9C super, and love it too. I would highly recommend you stick to Futaba receivers. If you really have to buy something less expensive, then stick with the clones from Tower and Hobbico. They are really 7 channel futabas dual conversion, with a different name on them. You can't beat the price of the eight channel PCM futaba, and the reliability and dependability can't be beat for the money. I must confess, I have one FMA Direct, lightweight, dual conversion 8 channel, that I use in a cheaper 3D airplane, and have had good luck with it so far. It wasn't really all the cheap at $69.95, when you consider I could have bought a PCM for $30.00 more. Good luck with your 9C, just remember, your airplane needs a good receiver to be safe.