Sony CD Walkman D-F525 Operating Instructions Manual page 15

To improve reception
For FM, extend the headphones/earphones cord and the remote control cord.
For AM, reorient the tuner-remote control itself.
If noise is heard
• Disconnect the AC power adaptor or the car battery cord.
• Reception may become poor if the tuner-remote control is used near other radios, television
sets, computers, CD players, etc. Use it away from such devices.
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