I already tried following this guide but the problem was when i turn off my receiver the output on the throttle channel just stays at whatever it was at when turned off. Thats the reason i thought i needed the frsky RX.
Hmm, that sounds to me like the AIOP doesn't behave the same as the APM 2.5's PPM encoder when the pulses stop. I'm not familiar with AIOP's workings at that level. @barneyg or one of the others may know it much better in that respect.
"Its better than bad, its good"
Current FCs: APM 2.5, Naze32, CC3D, KK2.1.5
Aircraft: TBS Disco, 450 Firefly, 250 Pro, ZMR250, Hammer 250, Hubsan X4, Bixler 2