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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.
In the late 1960s, the U.S. long-distance telephone network began to convert to a digital network, employing digital radios for many of its links. 1970s: LORAN became the premier radio navigation system. Soon, the U.S. Navy experimented with satellite navigation. 1987: The GPS constellation of satellites was launched. Early 1990s: Amateur radio ...
The early history of radio is the history of technology that produces and uses radio instruments that use radio waves. Within the timeline of radio, many people contributed theory and inventions in what became radio. Radio development began as "wireless telegraphy". Later radio history increasingly involves matters of broadcasting.
In the 1970s popular Top 40 radio formats began appearing on the FM band, as it reached critical mass and began to become the dominant band, at the expense of the older AM band. Some FM stations became known for their experimentation; with early freeform stations evolving into progressive rock , the first radio format designed specifically to ...
In 1900, construction began on a large radio transmitting alternator. Fessenden, experimenting with a high-frequency spark transmitter , successfully transmitted speech on 23 December 1900, over a distance of about 1.6 kilometres (0.99 mi), the first audio radio transmission .
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 with standard AM receivers. There are two main classes of systems: independent sideband (ISB) systems, promoted principally by American broadcast engineer Leonard R. Kahn ; and quadrature ...
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The first shortwave station in Europe. 25 June 1926 (test transmissions began), and the first shortwave station in the world with its own dedicated programming rather than being a simulcast of an AM/MW or LW station such as KDKA. Regular broadcast from 30 May 1927 to May 1940 when the station went dark due to the German occupation of Holland ...