Questions about radios. I have inherited old Kraft and Futaba AM Radios. Too expensive to Gold Sticker these. I have bought 2 Spectrum DX 6's for my foamies. I have a couple of FM recevers on channel 46. My question is about single conversion and double conversion and what works with what? And can I use my DX6 for 40 to 60 size nitro planes with the small receiver that comes with it?

Please help!!!