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You are changing the capacitance of the main component that determines the

frequency of the "local oscillator" in the radio. The local oscillator mixes with all

of the radio signals that come in from the antenna, and converts them all down to

lower frequencies. The one signal that winds up converted to 10.7 MHz in an FM

radio (or 455 KHz in an AM radio) is the one that gets passed on and processed

by the rest of the guts of the radio. All the others get filtered out and discarded.

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12y ago
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6y ago

You change a variable resistor in the the tuning circuit. The value of the resistor dictates the frequency that the radio is receiving.

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11y ago

intensity

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Q: When you turn up the volume on a radio what changes?
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