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中頻MFMedium Frequency),頻段由300kHz 到 3000kHz,多數作AM電台。比中頻略低的是低頻(LF),比中頻略高的是高頻(HF)。在日間時,傳送距離較短;但是到了夜間時間可以利用電離層反射信號,可以作遠距離傳信。但是較容易和其他電台的信號混雜一起,影響接收。

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