It's not feasable anymore. The available units are much cheaper than you could build and even if you built one you wouldn't get near the quality and features available.It requires a bit of expensive electronic test equipment like an oscilloscope and spectrum analyser.It's even illegal to build you own in most countries unless you have a license to build.
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but can you you use a labtop to control a rc plane.
Not directly, you'll still need an interface (transmitter) to relay the commands to the plane.
don't even think about it - FAR too hard these days.
If the plane uses standard RC servos for control surfaces, I would just us an off the shelf model from a place like tower hobbies. If this is a custom build, I would consider some kind of serial RF link. There are many solutions out there for transfering a serial data stream. No RF design required other than an appropriate antenna. The cost will of course be proportional to the desired range and reliability of communication. With a serial link to a microprocessor on the aircraft, the functionality would be limited only by your programming skill and ambition. Overall, though, your request is pretty vague, so I don't know if I've helped.