Radio receiver crude triode, was invented in 1906 by Lee De Forest as a more sensitive detector for radio receivers, by adding a third electrode to the thermionic diode detector, the Fleming valve. It was not widely used until its amplifying ability was recognized around 1912. The first tube receivers, invented by De Forest and built by hobbyists until the mid 1920s, used a single Audion which functioned as a grid-leak detector which both rectified and amplified the radio signal. There was uncertainty about the operating principle of the Audion until Edwin Armstrong explained both its amplifying and demodulating functions in a
Scott Hudson (electrical engineer) Scott Hudson (electrical engineer) Raymond Scott Hudson (born 1959) is a professor of electrical engineering and computer science at Washington State University. Hudson was educated at Caltech, where he received his bachelor's degree in engineering and applied science in 1985, his master's degree in electrical engineering in 1986, and his PhD in electrical engineering in 1990. His research interests include radar imaging, optical signal processing, and radar astronomy. From August 19 to 22 of 1989, Hudson and Steven Ostro observed 4769 Castalia from the Arecibo Observatory, producing the first direct image of an asteroid. The main-belt asteroid 5723 Hudson, discovered