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superheterodyne receiver

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superheterodyne receiver

The most widely used type of radio receiver, in which the incoming signal is mixed with a signal of fixed frequency generated within the receiver circuits. The resulting signal, called the intermediate-frequency (i.f.) signal, has a frequency between that of the incoming signal and the internal signal. The intermediate frequency is near the optimum frequency of the amplifier to which the i.f. signal is passed.

This arrangement ensures greater gain and selectivity. The superheterodyne system is also used in basic television receivers.
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Figure 3 shows a superheterodyne receiver with two IF chains for the IEEE 802.
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