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What does FM/AM mean in a car?

1 Answers

MacAdeline

07/30/25 10:54am

FM and AM are two radio modes for car radios. One is FM mode, and the other is AM mode. Generally, FM is used more frequently in daily life. Below is an introduction to FM and AM: 1. FM and AM: FM is frequency modulation broadcasting for radios, while the AM band is medium-wave broadcasting, and FM is short-wave. Amplitude modulation waves are further divided into long-wave, medium-wave, and short-wave. 2. Characteristics of medium and long waves: The advantage is that the radio waves can propagate along the ground, covering a longer distance with better signal quality. The disadvantage is that the electrical signal attenuates quickly, making the signal too weak to receive at distant locations. 3. Characteristics of short waves: They cannot propagate along the ground; their transmission form is line-of-sight. Since the Earth's surface is spherical, the distance for line-of-sight transmission is limited.

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