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    • Radio interference factor
      Radio interference factor
      Medium wave The propagation of medium wave is mainly affected by the ionosphere. The medium wave station received at night will be more than during the day.
    • Radio transmission
      Radio transmission
      The amplitude modulation radio broadcast is divided into three large bands of long wave, medium wave and short wave, which are respectively transmitted by radio waves of corresponding bands.
    • Birth of the radio
      Birth of the radio
      Today, radio and television, which use radio waves to transmit sound and image programs, have penetrated into every corner of social life and become a companion to hundreds of millions of people. Radio was not invented by one or two people. It was the result of the gradual development of human civilization.