What does the term "bandwidth" refer to in radio communications?

The term "bandwidth" in radio communications specifically refers to the range of frequencies that can be transmitted or received effectively without significant loss of quality. This range is usually measured in Hertz (Hz) and indicates the difference between the highest and lowest frequencies in a given communication channel. A wider bandwidth allows for the transmission of more information at once, which is essential for high-quality audio or data transmission.

For instance, in amateur radio, different modes of transmission (like voice, data, or video) require different bandwidths. Understanding bandwidth is crucial for operators to choose the appropriate frequencies and adjust their equipment accordingly to ensure effective communication. This concept is fundamental to the operation of various communication systems including FM radio, television broadcasting, and digital data transmission.