Amplitude modulation, frequency range 530 - 1600 kHz (kHz) communicate using sound waves mixed in with wave radio called "carrier wave". The amplitude of the carrier wave will change according to the signal waves
in transmission A.M system.Can send waves both ground wave is a wave moving in a straight line parallel to the earth's surface and electric wave by wave will reflect the atmosphere, ionosphere Then reflected back down, so there's no need to use the antenna set high up!
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