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Superheterodyne receiver — A 5 tube superheterodyne receiver made in Japan around 1955 In electronics, a superheterodyne receiver (sometimes shortened to superhet) uses frequency mixing or heterodyning to convert a received signal to a fixed intermediate frequency, which… … Wikipedia
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Reciprocal altruism — Diagram showing reciprocal altruism In evolutionary biology, reciprocal altruism is a behaviour whereby an organism acts in a manner that temporarily reduces its fitness while increasing another organism s fitness, with the expectation that the… … Wikipedia
Phase-shift keying — Passband modulation v · d · e Analog modulation AM · … Wikipedia
History of American football positions — American Football position names are based on the role the player normally has in the offense, rather than necessarily his position at the start of the play. Tight ends, for instance, usually line up to the outside of one of the offensive tackles … Wikipedia
