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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]
The invention of the superheterodyne receiver solved this problem, and the first radios with a heterodyne radio receiver went for sale in 1924. But it was costly, and the technology was shelved while waiting for the technology to mature, and in 1929 the Radiola 66 and Radiola 67 went for sale.
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.
Austrian engineer Paul Eisler invented the printed circuit board. 1936: Scottish Scientist Robert Watson-Watt developed the radar concept which was proposed earlier. 1938: Russian-American engineer Vladimir K. Zworykin developed the iconoscope. 1939: Edwin Howard Armstrong developed the FM radio receiver. 1939
Sir Robert Alexander Watson-Watt KCB FRS FRAeS (13 April 1892 – 5 December 1973) was a Scottish radio engineer and pioneer of radio direction finding and radar technology. [2] Watt began his career in radio physics with a job at the Met Office, where he began looking for accurate ways to track thunderstorms using the radio waves given off by ...
Robert Henry Marriott (1879-1951) was an American electrical engineer, and one of the first persons to work in the field of radio communication. In 1902 he engineered the first commercial radiotelegraph link established in the United States by a U.S. company, connecting the island of Santa Catalina with the California mainland.
Pierre Robert has met dozens of famous musicians and is known as the heart and soul of WMMR Radio station, which is turning 50 this year. Lifers: Pierre Robert reflects on 30 years in the radio ...
The RCA Corporation was a major American electronics company, which was founded in 1919 as the Radio Corporation of America. It was initially a patent trust owned by General Electric (GE), Westinghouse , AT&T Corporation and United Fruit Company .