When1: 1914
When2: 1933
Who: Edwin Howard Armstrong [Armstrong, Edwin Howard] or Howard Armstrong [Armstrong, Howard]
What: engineer/inventor
Where: USA
works\ regenerative circuit [1914: amplification using positive feedback]; superheterodyne receiver [1918: signal waves and carrier wave have widely separated frequencies]; super-regenerative circuit [1922: for transmitting]; wide-band frequency modulation [1933: as opposed to narrow band]
Detail: He lived 1890 to 1954.
Physical Sciences>Physics>History>Invention
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Date Modified: 2022.0224