December 18, 1890 (GY winter in early VII), was born radio inventor Armstrong.


Armstrong, born December 18, 1890. U.S. radio inventor (inventor of the superheterodyne circuit). Encouraged by the G Marconi radio for the first time overseas communication in the age of 14, produced a number of radio devices in the home. (History cn) into Columbia Institute of Technology study, research triode design feedback circuit, signal amplification can be thousands of times, this circuit is still the heart of the radio - television broadcast equipment. A lecturer at his alma mater after graduation. World War I, when the U.S. Army Signal Corps in the Paris laboratory work, invented the superheterodyne circuit, this highly selective circuit magnification far exceeds the regenerative circuit, now common for radio, radar and television receivers adoption. Post-war return to his alma mater, he served as the assistant of the renowned physicist M �� Pu product, and later successor Professor Pu product position. Due to the invention of the feedback circuit, he was a gold medal, the United States highest honor Franklin Medal. The 1933 invention wideband frequency modulation is a new brilliant achievements have been widely used in radio, television, microwave relay communications, and satellite communications. He defend frequency modulation bankrupt because of sick suicide on January 31, 1951, by the International Communications Association chasing behind him that the great man of the world electrical field. a radio station in the history of