What does AM mean in cars?

1 Answers
MakaylaFitz
07/30/25 2:50am
AM in cars refers to the radio band of the car radio. Car radios have two modes: AM and FM. The AM band refers to medium-wave broadcasting. In radios, the AM and FM bands are two different broadcasting reception systems with distinct working principles that do not interfere with each other, and the output audio signals share the audio amplification circuit. AM stands for amplitude modulation, which defines the broadcast frequency range. The frequency scale for medium-wave and short-wave on ordinary civilian radios is the same, but the band range may vary among different brands of radios. For example, amplitude modulation broadcasting involves modulating the audio signal onto the amplitude of a high-frequency carrier wave and transmitting it into the air. The radio receives the AM radio signals from the air through a magnetic antenna or an external antenna.
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