Part of the Radio & Receiver Setup Center
Your radio system is the link between you and the airplane. It needs compatible equipment, a solid installation, the right programming, and a proper range check before you fly.
The main components
- Transmitter: The radio in your hands. It sends the commands from the sticks and switches.
- Receiver: The unit in the airplane that receives those commands and passes them to the servos, ESC, or throttle servo.
- Servos: Move the control surfaces and other functions.
- Power system: The receiver and servos still need power. That may come from the ESC’s BEC, an external BEC, or a separate receiver battery.
Channels and controls
A basic airplane normally uses four functions: aileron, elevator, throttle, and rudder. More channels can run flaps, retracts, lights, spoilers, tow releases, or separate servos on the same type of control surface.
Binding the receiver
Binding is how you pair a compatible receiver with the transmitter. Follow the manufacturer’s procedure, remove the propeller on an electric model, and check every control afterward. If the system has a power or signal problem, simply binding it again is not a fix.
Receiver and antenna installation
- Mount the receiver securely where it is protected from vibration.
- Route the antennas the way the manufacturer specifies. Keep them away from batteries, motors, ignition systems, carbon fiber, and heavy wiring when the instructions call for it.
- Do not sharply bend, cut, coil, or modify antenna tips.
- Secure wiring so connectors cannot work loose or rub against moving parts.
For a complete bench-side procedure, follow the RC airplane receiver installation, failsafe, and range-testing guide.
Set a safe failsafe
Failsafe tells the receiver what to do if it loses a valid signal. On most powered models, the throttle should go to a safe low or off position. Set the other controls as the radio manufacturer recommends for that model, then test the failsafe with the propeller removed.
Range checking
- Check the airplane and make sure the transmitter and receiver batteries are in good condition.
- Place the transmitter in its reduced-power range-test mode.
- Walk the distance specified by the radio manufacturer while moving the controls.
- Repeat from different model orientations and with the motor running if the manufacturer recommends it.
- If the controls become intermittent, delayed, or erratic, don’t fly until you find the cause.
Model memory and programming
Check the model memory before every flight. Then verify servo direction, channel assignments, endpoints, rates, expo, mixes, and throttle cut. Model Match is a useful extra layer of protection when your radio has it, but it doesn’t replace looking at the airplane and checking every control direction.
Related Podcast Episodes
- Ep 6: What Can Your Transmitter Do for You?
- Ep 8: RC Airplane Receivers
- Ep 212: How We Actually Set Up Our Radios
Before every flight
- Correct model selected
- Transmitter and receiver batteries healthy
- Antennas undamaged
- Controls move in the correct direction
- Throttle cut works
- Failsafe and range check completed when required
If you want to go farther, see our servo guide and pre-flight checks. If the receiver has no power or won’t link, work through the receiver binding and power diagnostic. For holds, reboots, or intermittent control, use the radio-signal diagnostic. If only one servo is acting up, follow the servo isolation procedure.
Ready to check the complete model? After the radio is programmed, continue with the RC Airplane Setup & Preflight Center to verify linkages, balance, stabilization, power, and final preflight items.