I am building my first rc plane and need to choose a radio. I'll be using the easy star frame and eventually be making it autonomous. Thinking ahead, I want to buy a radio that will work with ardupilot.It is suggested that you buy a six or seven channel radio. On towerhobbies, there seems to be 3 kinds of radios: FM, PCM, and Spread Spectrum Air. What's the difference?Also, there is a huge jump in price going from 6 channels to 7. For ardupilot, how important is a 7 channel radio vs a 6?
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It's a nice price ok quality