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The first car radio was introduced in 1922, but it was so large that it took up too much space in the car. [70] The first commercial car radio that could easily be installed in most cars went for sale in 1930. [71] [72]
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.
Marconi's demonstrations of the use of radio for wireless communications, equipping ships with life saving wireless communications, [133] establishing the first transatlantic radio service, [125] and building the first stations for the British shortwave service, have marked his place in history. [citation needed]
The next year the company used the same concept to begin establishing the first radio network. [107] The WEAF and WJZ chains. At the same time in early 1922 that it announced the beginning of advertisement-supported broadcasting, AT&T also introduced its plans for the development of the first radio network. [104]
The word radio is derived from the Latin word radius, meaning "spoke of a wheel, beam of light, ray".It was first applied to communications in 1881 when, at the suggestion of French scientist Ernest Mercadier [], Alexander Graham Bell adopted radiophone (meaning "radiated sound") as an alternate name for his photophone optical transmission system.
The first regular entertainment programs were broadcast in 1922, and on March 10, Variety carried the front-page headline: "Radio Sweeping Country: 1,000,000 Sets in Use." [ 6 ] A highlight of this time was the first Rose Bowl being broadcast on January 1, 1923, on the Los Angeles station KHJ .
In 1917 AT&T invented the first American air-to-ground radio transmitter. They tested this device at Langley Field in Virginia and found it was a viable technology. [ 5 ] In May 1917, General George Squier of the U.S. Army Signal Corps contacted AT&T to develop an air-to-ground radio with a range of 2,000 yards.
Crystal radios were the first widely used type of radio receiver, [11] and the main type used during the wireless telegraphy era. [12] Sold and homemade by the millions, the inexpensive and reliable crystal radio was a major driving force in the introduction of radio to the public, contributing to the development of radio as an entertainment ...