Definition
The range of frequencies, measured in hertz, that a radio channel, transmitter, receiver, or communication system occupies or can pass without significant loss of signal quality. It is calculated as the difference between the highest and lowest frequencies in that range.
Plain English
How wide a slice of the radio spectrum a signal takes up, or how wide a slice a piece of equipment can handle. A wider slice carries more information; a narrower slice carries less.
Context Anchor
Seen in discussions of aircraft radios, navigation receivers, antennas, and other electronic equipment.
Derivation
From 'band,' meaning a strip or range, plus 'width,' meaning how wide that strip is. Radio frequencies are grouped into 'bands,' and bandwidth is simply the width of the band a signal uses.
Why Pilots Care
Affects signal clarity, interference rejection, and reliable reception of navigation and voice communications.
Analogy
Think of a highway. A wide highway with many lanes (large bandwidth) lets a lot of traffic through at once. A narrow road (small bandwidth) carries less traffic but takes up less space.
Grounding Statement
On the frequency scale, bandwidth is the slice of space a radio signal takes up.
Intuition Check
Bandwidth does not mean internet speed here. In aviation radio and electronics, it means a range of frequencies.
Example Sentence 1
The new VHF radio has a narrower bandwidth, allowing more channels to fit into the same portion of the spectrum.
Example Sentence 2
A narrow bandwidth on the navigation receiver reduces interference from nearby stations.