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Edwin Howard Armstrong (December 18, 1890 [2] – February 1, 1954 [3]) was an American electrical engineer and inventor who developed FM (frequency modulation) radio and the superheterodyne receiver system.
The Armstrong method generates a double sideband suppressed carrier signal, phase shifts this signal, and then reinserts the carrier to produce a frequency modulated signal. Frequency modulation generates high quality audio and greatly reduces the amount of noise on the channel when compared with amplitude modulation .
The Armstrong effect is the physical process by which static electricity is produced by the friction of a fluid. It was first discovered in 1840 when an electrical spark resulted from water droplets being swept out by escaping steam from a boiler.
Schematic of the NSD body attached to the NASA Standard Initiator (NSI), an electric initiator device.. The NASA Standard Detonator (NSD) is a device used by NASA for applications where a charge must be detonated, usually in conjunction with frangible nuts as a release mechanism.
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Unbending was the initiator of one of the rare modern-day boarding parties: having surfaced beside a schooner in the gulf of Sfax, Unbending found herself unable to hit the small ship with her deck gun, so a resourceful officer leapt aboard and set fire to the entire ship using only a can of shale oil. [2]
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Armstrong's words on the lunar surface also spun off various parodies. [ 222 ] While most people celebrated the accomplishment, disenfranchised Americans saw it as a symbol of the divide in America, evidenced by protesters led by Ralph Abernathy outside of Kennedy Space Center the day before Apollo 11 launched. [ 225 ]
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