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Over-the-air radio broadcasting in the Philippines mostly belongs to the AM and FM bands. The AM broadcast band in the Philippines is on 531–1701 kHz with 9 kHz spacing (530–1700 kHz with 10 kHz spacing from the American colonial era and post-independence up to 1978), and is predominantly used for news and public service broadcasting. The ...
15 July – Inauguration of DZRH, one of the oldest radio stations in the Philippines. 29 July – In France, with war on the horizon, a package of decrees tightens the state's control of public radio and obliges all private stations to broadcast, unedited, the government's Radio-Journal in place of their own news programmes. [3]
Milestones in radio: the first half century (1895–1945). The UNESCO courier (February 1997), p. 16–21; Radio Review/Radio Listeners Guide (1925–1929), Broadcasting Yearbook (1935–2010), World Radio TV Handbook (1947–) Berg, Jerome S. The early shortwave stations: a broadcasting history through 1945 (2013) radioheritage.net
Interest in amateur radio was noted in the Philippines in the early 1920s. [45] There were radio stations operating in the Philippines, including one owned by American businessman named Henry Hermann, as early as 1922, according to some sources; not much documentation about that period of time exists.
1920s: Radio was first used to transmit pictures visible as television. 1926: Official Egyptian decree to regulate radio transmission stations and radio receivers. [40] Early 1930s: Single sideband (SSB) and frequency modulation (FM) were invented by amateur radio operators. By 1940, they were established commercial modes.
Position of FM radio in the electromagnetic spectrum A commercial 35 kW FM radio transmitter built in the late 1980s. It belongs to FM radio station KWNR, in Henderson, Nevada, and broadcasts at 95.5 MHz. FM broadcasting is a method of radio broadcasting that uses frequency modulation (FM) of the radio broadcast carrier wave.
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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.