Radio Amateur Quiz Canadian License

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Question B-008-002-001

What devices would you install to reduce or eliminate audio-frequency interference to home entertainment systems?

Correct Answer

Coils on ferrite cores

Explanation

Wrapping speaker wires or interconnect cables around ferrite cores creates common-mode chokes. These present high impedance to RF signals picked up by the wires, preventing them from entering the audio equipment and being rectified.

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