"AM radio" redirects here. For the song by Everclear, see AM Radio (song). For the American musical group, see AM Radio (band).
AM broadcasting is radio broadcasting using amplitude modulation (AM) transmissions. 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.
The earliest experimental AM transmissions began in the early 1900s. However, widespread AM broadcasting was not established until the 1920s, following the development of vacuum tube receivers and transmitters. 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. 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.
Compared 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.[1][2] Thus, AM broadcasters tend to specialize in spoken-word formats, such as talk radio, all-news radio and sports radio, with music formats primarily for FM and digital stations.
^"VERIFY: Why Does AM Radio Sound Worse Than FM?". wfmynews2.com. November 6, 2017. Retrieved 2022-12-29.
^"A Science Odyssey: Radio Transmission: FM vs AM". pbs.org. Retrieved December 29, 2022.
AMbroadcasting is radio broadcasting using amplitude modulation (AM) transmissions. It was the first method developed for making audio radio transmissions...
FM broadcasting offers higher fidelity—more accurate reproduction of the original program sound—than other broadcasting techniques, such as AM broadcasting...
include AM and FM stations. There are several subtypes, namely commercial broadcasting, non-commercial educational (NCE) public broadcasting and non-profit...
electromagnetic spectrum (radio waves), in a one-to-many model. Broadcasting began with AM radio, which came into popular use around 1920 with the spread...
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utilization of the transmission medium. AM remains in use in many forms of communication in addition to AMbroadcasting: shortwave radio, amateur radio, two-way...
both AM and FM. AM (amplitude modulation) – in AM, the amplitude (strength) of the radio carrier wave is varied by the audio signal. AMbroadcasting, the...
a part of the medium frequency (MF) radio band used mainly for AM radio broadcasting. The spectrum provides about 120 channels with more limited sound...
frequencies is known as high frequency (HF). MF is mostly used for AM radio broadcasting, navigational radio beacons, maritime ship-to-shore communication...
influence. Common mediums include AM and FM radio, shortwave radio, television, and the Internet. Public broadcasting may be nationally or locally operated...
AM stereo is a term given to a series of mutually incompatible techniques for radio broadcasting stereo audio in the AM band in a manner that is compatible...
"Radio Japan" trademarks. Nippon Broadcasting System lost the lawsuit. In 1992, JOLF started broadcasting in C-QuAM stereo, continuing until March 31...
radio broadcasting systems; AM and FM. In amplitude modulation (AM) the strength of the radio signal is varied by the audio signal. AMbroadcasting is allowed...
established a string of 10 AM stations in provincial areas. In 1987, NBC acquired DWXX 1026 AM from Hypersonic Broadcasting Center and it was reformatted...
5 kHz is used for AMbroadcasting in addition to the medium-wave band, the term longwave usually refers specifically to this broadcasting band, which falls...
Hubbard Broadcasting, Inc. is an American television and radio broadcasting corporation based in St. Paul, Minnesota. It was founded by Stanley E. Hubbard...
The European Broadcasting Union (EBU; French: Union européenne de radio-télévision, UER) is an alliance of public service media organisations whose countries...
franchise. 9. XEABC-AM in Mexico City, which formerly branded as "ABC Radio". ABS-CBN The Alto Broadcasting System–Chronicle Broadcasting Network, a major...
have more stations. There are also an increasing number of AM stations that start broadcasting on FM (on 90-95 MHz) as a supplement. The stations that air...
commercial broadcasters that provide AMbroadcasting nationwide, excluding Hokkaido and Akita, to shift to FM broadcasting, announced on June 15, 2021. Subsequently...
criteria set down in the Broadcasting Act. The second national licence, INR2, would take over the 1197 kHz and 1215 kHz medium wave (AM) frequencies, which...
Mahinda Rajapakse, to invest in the future of the SLBC. AMbroadcasting#History FM broadcasting#History Oldest radio station Oldest television station...
The British Broadcasting Corporation (BBC) is a British public service broadcaster headquartered at Broadcasting House in London, England. Originally established...
satellite broadcasting, greatly enhancing its ability to distribute content nationally. Also in 1975, the ABC introduced a 24-hour-a-day AM rock station...
16 hours a day (8 a.m. to midnight). On January 5, 1940, Armstrong, working with the Yankee Network, demonstrated FM broadcasting in a long-distance...