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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.
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.
The timeline of radio lists within the history of radio, the technology and events that produced instruments that use radio waves and activities that people undertook. Later, the history is dominated by programming and contents, which is closer to general history .
AM and FM digital subcarriers: In 2002 the FCC adopted iBiquity's in-band on-channel (IBOC) technology, branded as HD Radio, for adding digital subcarriers to AM and FM radio transmissions. This allows AM stations to concurrently transmit digital versions of their standard analog signals, and also provides a way for FM stations to transmit ...
AM 1500 kHz 50 Watts (1923). First radio station in China. [35] 2FC: 2RN, Radio National Sydney 12 December 1923. One of six Sealed Set system stations; AM 273 kHz [33] [34] Radio Ibérica N/A Madrid, Spain 22 December 1923.; AM 729 kHz N/A 19 September 1924 Radio Belgrade: Belgrade, Serbia 19 September 1924.; AM 684 kHz N/A 3AR: 3RN, Radio ...
WCBS, News Radio 880 AM, has a deep history in New York City and the suburbs. News broke Monday that the station as it's been known will be no longer.Here's a look at how it got started and a ...
The Golden Age of Radio, also known as the old-time radio (OTR) era, was an era of radio in the United States where it was the dominant electronic home entertainment medium. It began with the birth of commercial radio broadcasting in the early 1920s and lasted through the 1950s, when television gradually superseded radio as the medium of choice ...
Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting messages with a radio wave.In amplitude modulation, the amplitude (signal strength) of the wave is varied in proportion to that of the message signal, such as an audio signal.