RC transmitters explained

The transmitter is the one bit of kit that can outlast every model you own. Buy the right one and it flies your first trainer, your second helicopter and whatever comes after. Buy the wrong one and you'll find your next model won't bind to it.

What the transmitter and receiver do

The transmitter turns your stick movements into a radio signal. The receiver in the model turns that back into commands for the servos and speed controller. On 2.4GHz the two are bound together once, so the receiver only listens to your transmitter. If the signal is lost, a properly set failsafe cuts the throttle.

Protocols: the decision that matters most

Different manufacturers' radios speak different languages, called protocols. A receiver only works with a transmitter that speaks its protocol.

Multi-protocol radios

Some radios have a multi-protocol module that can talk to a long list of systems, including DSM2/DSMX, FrSky D8/D16, FlySky AFHDS 2A, Futaba S-FHSS and many toy-drone protocols (multiprotocol protocol list). It doesn't cover everything (not FrSky ACCESS, Futaba FASSTest, FlySky AFHDS 3 or ExpressLRS through the same module), but it covers most Bind-N-Fly models.

The practical advice: look at what you want to fly next, check its protocol, and buy a radio that supports it. If you're unsure, ask what the local club uses: people there can help you set it up.

Stick radios and pistol-grip radios

Aircraft use stick radios with two gimbals. Cars and boats use pistol-grip radios with a trigger for throttle and a wheel for steering. You can drive a car with a stick radio, but it feels odd; very few people fly with a pistol grip.

Channels

Each separate function uses a channel:

A 6 to 8 channel aircraft radio covers almost everyone. Our guide to 4 channel vs 6 channel helicopters explains channels on helicopters in more depth.

Mode 1 and Mode 2

The mode decides which stick does what. On Mode 2, the left stick is throttle (and, on a plane, rudder) and the right stick steers. On Mode 1, throttle moves to the right stick and elevator to the left. Most modern radios ship as Mode 2 and most new UK pilots learn on it (a BMFA club's training notes), though plenty of experienced club pilots fly Mode 1. Most radios can be converted.

The RC helicopter controls and RC plane controls guides show each stick in detail.

Features that matter

• Model memory. Store each model's settings separately. Even budget radios now hold 20 or more.
• Helicopter mixing. Swashplate types, throttle and pitch curves, throttle hold. Essential for collective pitch helicopters, even with a flybarless unit.
• Flight mode and switches. Enough switches to select stability modes and a throttle cut.
• Telemetry. Battery voltage and signal strength on the screen. Very useful, especially on helicopters and planes.
• Trainer link. Lets an instructor take control with a second radio. Invaluable for learning at a club.
• Simulator connection. Many radios work as a USB joystick on a computer. See RC flight simulators.

Open-source radios (EdgeTX)

Radios such as the RadioMaster Pocket, Boxer and TX16S run EdgeTX, open-source firmware that can do almost anything. The flexibility is huge, but setting one up for a helicopter takes more learning than a Spektrum radio. If you enjoy tinkering, they're superb value.

Recommendations by budget

UK prices checked October 2026. These are chosen on reputation and specification, not a head-to-head test.

If you have a Blade helicopter or E-flite plane, a Spektrum radio is the simplest choice. If you want one radio for a mix of brands, a multi-protocol EdgeTX radio gives the most choice. Prices from UK retailers including Model Helicopters UK and Unmanned Tech.

What about older 35MHz radios?

They still work, but crystals are hard to get. See converting a 35MHz model to 2.4GHz.

More radio and power guides are on the Electronics hub.