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In a superheterodyne receiver without an RF amplifier, the input to the mixer stage has a variable capacitor in parallel with an inductance. The variable capacitor is for:
tuning the receiver preselector to the reception frequency
This describes the preselector tuning. The variable capacitor adjusts the resonant frequency of the input tuned circuit (preselector) to select the desired incoming RF signal and provide some initial rejection of out-of-band signals before the mixer.
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