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What does AM mean on a car?

2 Answers

Adaline

07/28/25 9:14pm

Car radios have two modes: one is AM and the other is FM, with FM being more commonly used in daily life. AM refers to amplitude modulation in radio broadcasting, specifically the medium wave band. Below is additional information about AM: 1. Broadcast frequency range: The frequency range for broadcasting, such as the medium wave (525~1610KHz) and shortwave (3200~22000KHz) marked on ordinary civilian radios. The band range may vary among different brands of radios. 2. AM broadcasting: AM broadcasting involves modulating the audio signal onto the "amplitude" of a high-frequency carrier wave, which is then transmitted into the air. The radio receives the AM radio signals from the air through a magnetic antenna or an external antenna, and then demodulates the audio signal through a high-frequency tuning → intermediate frequency amplification → detection circuit. The audio signal is then amplified by the audio amplification circuit to restore the radio program content.

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Genesis

08/12/25 1:54am

In my daily driving, I often use AM to listen to various programs, which refers to the amplitude modulation broadcast system in the car. Simply put, AM is the abbreviation for amplitude modulation, meaning that audio signals are transmitted by adjusting the amplitude of the waveform. This technology gives AM broadcasting strong long-distance coverage, especially in rural or mountainous areas where the signal is less likely to drop. I like it because it allows me to receive local news, sports commentary, and traffic updates, making it convenient to check real-time road conditions while traveling. Compared to FM (frequency modulation) broadcasting, AM has slightly rougher sound quality but better penetration, and it performs even better at night. Nowadays, many new cars integrate digital features, but AM still plays a key role in emergency broadcasting, such as being the most reliable during disaster warnings. Overall, AM is a classic feature of car radios—not flashy but highly practical.

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