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In the early days one had to use headphones to listen to radio. Later loudspeakers in the form of a horn of the type used by phonographs, equipped with a telephone receiver, became available. But the sound quality was poor. In 1926 the first radios with electrodynamic loudspeakers went for sale, which improved the quality significantly.
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.
One of the longest running radio programs celebrating this era is The Golden Days of Radio, which was hosted on the Armed Forces Radio Service for more than 20 years and overall for more than 50 years by Frank Bresee, who also played "Little Beaver" on the Red Ryder program as a child actor.
A crystal radio receiver, also called a crystal set, is a simple radio receiver, popular in the early days of radio. It uses only the power of the received radio signal to produce sound, needing no external power.
After radio communication was developed Lodge's lecture would become the focus of priority disputes over who invented wireless telegraphy (radio). His early demonstration and later development of radio tuning (his 1898 Syntonic tuning patent) would lead to patent disputes with the Marconi Company. When Lodge's syntonic patent was extended in ...
In an interview with The N&O in 2002, Lamm described those glory days of radio. “You can’t imagine how big radio was prior to TV,” he said. “It was incredibly exciting just after World War II.
Ernst Frederick Werner Alexanderson (Swedish: [ɛʂnt alɛkˈsandɛʂɔn]; January 25, 1878 – May 14, 1975) was a Swedish-American electrical engineer and inventor who was a pioneer in radio development. He invented the Alexanderson alternator, an early radio transmitter used between 1906 and the 1930s for longwave long
A few early stations, notably 8MK (later known as WWJ in Detroit) were started by newspapers, but in those early years, radio and newspapers regarded each other as competitors. One early station, 8XK in Pittsburgh, became KDKA in 1920; its ownership has asserted that it was the first radio station in the US, but that claim is controversial [ 60 ]