Superheterodyne receiver

The superheterodyne receiver, commonly called the superhet, is a radio receiver that uses heterodyning to convert incoming radio-frequency (RF) signals to a fixed intermediate frequency (IF). The signal is then amplified and filtered at that fixed frequency. This arrangement separates tuning from most of the gain and filtering: the RF circuits make an initial, relatively broad selection of the desired station, while the IF stages provide most of the amplification and the selectivity needed to separate it from adjacent stations.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain

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