Later, AM radio's audiences declined greatly due to competition from FM ( frequency modulation) radio, Digital Audio Broadcasting (DAB), satellite radio, HD (digital) radio, Internet radio, music streaming services, and podcasting.Ĭompared to FM or digital transmissions, AM transmissions are more expensive to transmit due to the necessity of having to transmit a high power carrier wave to overcome ground losses, and the large antenna radiators required at the low broadcast frequencies, but can be sent over long distances via the ionosphere at night however, they are much more susceptible to interference, and often have lower audio fidelity. AM radio remained the dominant method of broadcasting for the next 30 years, a period called the " Golden Age of Radio", until television broadcasting became widespread in the 1950s and received much of the programming previously carried by radio. However, widespread AM broadcasting was not established until the 1920s, following the development of vacuum tube receivers and transmitters. The earliest experimental AM transmissions began in the early 1900s. It was the first method developed for making audio radio transmissions, and is still used worldwide, primarily for medium wave (also known as "AM band") transmissions, but also on the longwave and shortwave radio bands. For the American musical group, see AM Radio (band).ĪM broadcasting is radio broadcasting using amplitude modulation (AM) transmissions. For the song by Everclear, see AM Radio (song).
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