What does the term "bandwidth" refer to in a radio context?

In the context of radio communications, "bandwidth" specifically refers to the range of frequencies that a transmitter can utilize. This is essential for defining how much information can be transmitted over a signal within that frequency range. For example, a radio channel's bandwidth determines how many different signals can be sent simultaneously without interference, directly impacting the clarity and quality of the communication.

Bandwidth is measured in hertz (Hz) and is a key factor in determining the capacity of a communication system. A wider bandwidth allows for the transmission of more data, which facilitates higher quality sound or video, more channels, or faster data rates. This concept is critical for understanding frequency allocation in radio systems and the design of communication networks.

In contrast, other responses reference aspects that do not pertain directly to the definition of bandwidth. The physical size of the transmitter, total power output, and the distance a signal can travel are relevant in different contexts but do not accurately describe what bandwidth signifies in terms of frequency usage.