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  2. History of radio - Wikipedia

    en.wikipedia.org/wiki/History_of_radio

    When radio was introduced in the early 1920s, many predicted it would kill the phonograph record industry. Radio was a free medium for the public to hear music for which they would normally pay. While some companies saw radio as a new avenue for promotion, others feared it would cut into profits from record sales and live performances.

  3. Timeline of radio - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_radio

    1954: Regency introduced a pocket transistor radio, the TR-1, powered by a "standard 22.5V Battery". 1960: Sony introduced their first transistorized radio, small enough to fit in a vest pocket, and able to be powered by a small battery. It was durable, because there were no tubes to burn out.

  4. Invention of radio - Wikipedia

    en.wikipedia.org/wiki/Invention_of_radio

    Before the discovery of electromagnetic waves and the development of radio communication, there were many wireless telegraph systems proposed and tested. [4] In April 1872 William Henry Ward received U.S. patent 126,356 for a wireless telegraphy system where he theorized that convection currents in the atmosphere could carry signals like a telegraph wire. [5]

  5. Regency TR-1 - Wikipedia

    en.wikipedia.org/wiki/Regency_TR-1

    Regency TR-1 transistor radio. The Regency TR-1 was the first commercially manufactured transistor radio, introduced in 1954.Despite mediocre performance, about 150,000 units were sold, due to the novelty of its small size and portability.

  6. 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

  7. Radio - Wikipedia

    en.wikipedia.org/wiki/Radio

    Radio is the technology of communicating using radio waves. [1] [2] [3] ... The current television standard, introduced beginning in 2006, ...

  8. Radio in the United States - Wikipedia

    en.wikipedia.org/wiki/Radio_in_the_United_States

    Cable radio: Cable radio providers include Music Choice, Muzak, DMX, Sonic Tap and Canada-based Galaxie. CRN Digital Talk Radio Networks specialize in talk radio. [6] Satellite radio: Direct-to-consumer satellite radio broadcasting was introduced in the United States in 1997; there is only a single provider, SiriusXM. Technical operations are ...

  9. Edwin Howard Armstrong - Wikipedia

    en.wikipedia.org/wiki/Edwin_Howard_Armstrong

    Edwin Howard Armstrong (December 18, 1890 [2] – February 1, 1954 [3]) was an American electrical engineer and inventor who developed FM (frequency modulation) radio and the superheterodyne receiver system.