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Microphone Month 4

Receiver Image

A second transmission frequency that a superheterodyne receiver will respond to. The image frequency is two times the IF frequency either above or below the carrier frequency, depending upon whether the receiver design uses “low side” or “high side” injection. An RF signal on the “image” frequency of the receiver will produce a difference signal in the mixer just as valid as the intended IF signal created by mixing the oscillator with the carrier.

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