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Edwin Howard Armstrong
Videos
Edwin Howard Armstrong was an American radio-frequency engineer and inventor who developed FM radio and the superheterodyne receiver system.
Sketch of Armstrong, c. 1954
Sketch of Armstrong, c. 1954
Armstrong's boyhood home, overlooking the Hudson River in Yonkers, New York, c. 1975
Armstrong's boyhood home, overlooking the Hudson River in Yonkers, New York, c. 1975
Armstrong explaining the superregenerative circuit, New York, 1922
Armstrong explaining the superregenerative circuit, New York, 1922
Armstrong arranged for the construction of a transmission tower in Alpine, New Jersey, near New York City, and financed demonstration operation of W2X
Armstrong arranged for the construction of a transmission tower in Alpine, New Jersey, near New York City, and financed demonstration operation of W2XMN, the first FM radio station. W2XMN's antenna is mounted between the top two tiers, visible as a vertical line at the far upper right.
Lee de Forest
Videos
Lee de Forest was an American inventor, electrical engineer, and early pioneer in electronics of fundamental importance. He invented the first practical electronic amplifier, the three-element "Audion
Edwin Howard Armstrong
…2001. Armstrong attended Columbia University, and served as a professor there for most of his life. Armstrong is also noted for his legal battles with Lee de Forest and David Sarnoff, two other key figures in developing the early radio industry in the United States. The prolonged litigation took a toll on Armstrong's…
Lee de Forest c. 1904
Lee de Forest c. 1904
De Forest, some time between 1914 and 1922, with two of his Audions, a small 1-watt receiving tube (left), and a later 250-watt transmitting power tub
De Forest, some time between 1914 and 1922, with two of his Audions, a small 1-watt receiving tube (left), and a later 250-watt transmitting power tube (right), which he called an "oscillion".
American DeForest Wireless Telegraph Company's observation tower, 1904 Louisiana Purchase Exposition at Saint Louis, Missouri
American DeForest Wireless Telegraph Company's observation tower, 1904 Louisiana Purchase Exposition at Saint Louis, Missouri
Ohio Historical Marker: On July 18, 1907, Lee de Forest transmitted the first ship-to-shore messages that were sent by radiotelephone.
Ohio Historical Marker: On July 18, 1907, Lee de Forest transmitted the first ship-to-shore messages that were sent by radiotelephone.