There is a lot of noise in the FM radio broadcast and the sound quality is poor.
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The FM signal may be weak inside a building or vehicle. Listen to the FM broadcast near a window if the signal is weak inside a building or vehicle.
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The headphone cord functions as an antenna. Extend the headphone cord as far as possible.
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When using a device that emits radio signals such as a mobile phone, keep it away from your Walkman.