Amplitude modulation (AM) tuners are electronic devices used for receiving and demodulating amplitude-modulated radio signals. AM radio broadcasting is a method of transmitting information through the modulation of the amplitude of a carrier wave. The carrier wave is a high-frequency signal that is modulated by the audio signal, which contains the information to be transmitted. The AM tuner receives this modulated signal and extracts the audio signal from it, which is then amplified and sent to a speaker for playback. AM tuners are commonly used for receiving radio broadcasts in the medium wave (MW) and shortwave (SW) frequency bands. They typically consist of a radio frequency (RF) amplifier, a mixer, a local oscillator, an intermediate frequency (IF) amplifier, a detector, and an audio amplifier. The RF amplifier amplifies the incoming signal, which is then mixed with the local oscillator signal to produce an IF signal. The IF amplifier amplifies the IF signal, which is then demodulated by the detector to extract the audio signal. The audio signal is then amplified by the audio amplifier and sent to a speaker for playback. AM tuners are widely used in radio broadcasting and communication systems. They are also used in radio receivers for aircraft, ships, and other vehicles. In addition, AM tuners are used in scientific research for studying the propagation of radio waves through the ionosphere and the earth's atmosphere.
Amplitude modulation, radio signals, demodulation, carrier wave, audio signal
CITATION : "David Jones. 'Amplitude Modulation Tuners.' Design+Encyclopedia. https://design-encyclopedia.com/?E=284468 (Accessed on April 22, 2025)"
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