Definition
A rate of electromagnetic wave oscillation, expressed in hertz (Hz), within the range used for radio communication and navigation. In aviation, radio frequencies span roughly 30 kHz to 300 GHz and are assigned by regulatory authorities for specific uses such as voice communication, navigation aids, and surveillance.
Plain English
It is the specific channel number, measured in hertz, that a radio is tuned to in order to send or receive a signal. Different jobs (talking to a tower, listening to a navigation beacon) use different frequencies.
Context Anchor
Seen in aircraft radio, navigation, antenna, and signal discussions.
Derivation
From Latin radius (ray) and the Latin frequentia (frequent occurrence). 'Radio' refers to the radiating waves; 'frequency' refers to how often the wave cycles per second. Together it describes how rapidly a radio wave oscillates.
Why Pilots Care
Using the correct radio frequency maintains contact with controllers and receives accurate navigation information; an incorrect selection breaks communication and can lead to lost situational awareness.
Analogy
It is like tuning a car radio to the correct station. If you select the wrong frequency, you may hear the wrong signal or nothing useful at all.
Grounding Statement
When you tune an aircraft radio, you are selecting the radio frequency the radio will listen to or transmit on.
Intuition Check
Frequency here does not mean how often you use the radio. It means the rate at which a radio wave repeats, which is what separates one radio signal or channel from another.
Example Sentence 1
Before contacting the tower, the pilot tuned the radio frequency shown on the approach chart.
Example Sentence 2
Navigation aids such as VORs transmit on assigned radio frequencies that the receiver must be tuned to for accurate course guidance.