Superheterodyne receiver

A superheterodyne receiver, often shortened to superhet, is a type of radio receiver that uses frequency mixing to convert a received signal to a fixed intermediate frequency (IF) which can be processed more efficiently and selectively than the original carrier frequency. Edwin Howard Armstrong developed the concept, though Lucien Lévy, Walter Schottky, Henry Round, and John Renshaw Carson explored related ideas. The superheterodyne design is used in most radio receivers today and can be used for many modulation schemes, including amplitude modulation (AM).

According to Nahin, any receiver that shifts the antenna signal frequencies to new locations in the spectrum is a heterodyne receiver. The prefix super is reserved for those receivers that include both a RF input filter for image rejection, and a fixed-frequency, narrow-band intermediate-frequency amplifier for adjacent-channel suppression.

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