Like antique vehicles, radios can be divided into five classifications: In 1954, GE entered the UHF 450-470 MHz range. In 1940, Fred Link and Daniel Knoble introduced the large-scale VHF FM two-way (actually three-way) radio system. In 1934, GE produced its first two-way AM equipment. General Electric entered the land mobile (police) radio market in 1931. After a brief return to RCA, Westinghouse began making its own radios in 1946. Westinghouse used American Bosch and Emerson as suppliers. In 1936, General Electric introduced its brand of radios. Other innovations include the first practical loudspeaker and a method for recording sound on films. Irving Langmuir developed the electron tube. RCA sold vacuum tubes under its Radiotron brand. RCA marketed GE made radios under the Radiola brand and sold its first radios with the superheterodyne chassis in early 1924. General Electric began manufacturing and distributing radios through its RCA brand starting in 1919. General Electric withdrew from the partnerships in 1932. In 1922, General Electric launched WGY in Schenectady, its own radio station. In 1919, General Electric formed with AT&T, Westinghouse, and the United Fruit Company, the RCA patent partnership to develop radio technology. General Electric bought out a subsidiary of Marconi and reorganized it as RCA (Radio Corporation of America). The arrival of the vacuum tube revolutionized modern electronics and the home radio. Until the early 1920s, the most common form of radio reception was through the use of a crystal set. Marconi received a patent for the radio from the US Patent Office in 1904.
In 1901, Marconi achieved the first transatlantic radio communication. Guglielmo Marconi built the first commercially successful wireless telegraphy system in the mid-1890s utilizing Heinrich Hertz’s 1888 proof of transmitted airborne electromagnetic waves.
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