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In a superheterodyne receiver, a stage before the IF amplifier has a variable capacitor in parallel with a trimmer capacitor and an inductance. The variable capacitor is for:
tuning of the local oscillator (LO)
This describes a tuned circuit for the Local Oscillator (LO). The variable capacitor is the main tuning control, ganged with the RF tuning, to set the LO frequency so that its difference with the RF input always equals the IF.
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