Definition
The specific channels, measured in megahertz (MHz), used by aircraft radios to transmit and receive voice communications with air traffic control, other aircraft, and ground stations. Each airport, control facility, and service is assigned its own frequency so that pilots and controllers can talk to the right party without interference from other transmissions.
Plain English
The radio channels pilots tune in to talk to towers, controllers, and other aircraft. Each one has a number, and you set that number on the radio to hear and be heard by the right people.
Context Anchor
Pilots encounter radio frequencies during preflight planning, on charts and airport information pages, and when setting up the radio before or during flight.
Derivation
Radio comes from a word meaning “ray” or “beam,” because radio uses invisible waves sent through the air. Frequency means how often something repeats. Together, radio frequency means the repeat rate of a radio wave, which is why each usable radio setting has its own number.
Why Pilots Care
Selecting the correct frequency keeps communications reliable, prevents interference, and ensures timely ATC instructions that directly affect safety and traffic separation.
Analogy
A radio frequency is like a phone number for a radio. If you choose the wrong number, your message goes to the wrong place or no one useful hears it.
Intuition Check
Do not think of radio frequencies as general “radio stations” like music stations. In aviation, they are specific numbered settings used to reach a particular aviation station, service, or signal.
Example Sentence 1
Before entering the traffic pattern, the pilot tuned the radio to the airport's CTAF frequency and announced their position.
Example Sentence 2
After takeoff the instructor told the student to contact departure on the new radio frequency listed on the departure plate.