A high-frequency electromagnetic waves which spread over longer periods of time with the speed of light is equivalent to 300 million meters per second. A radio transmitter to generate high-frequency electromagnetic waves or radio waves (RF), mixed with sound waves (Audio Frequency-AF) and then send out. Alone in low-frequency sound waves, which could not be delivered to the distance to the radio transmit radio waves is that the carrier wave (Wave Carier) radio receiver will receive the radio waves Act and split off from radio waves, sound waves, listening to the sound is normal.Frequency refers to the number of cycles of the wave changes in 1 minute sound waves have a frequency range where the ear of people listen to is from 20 Hz to 20 Hz, kilo, ton (1 KHz = 1,000 Hz), while radio waves are electromagnetic waves of high frequency may range from 3 KHz to 300 GHz, and until the.(1 GHz = thousand million Hz) each radio wave frequencies are assigned to the different applications, as appropriate.
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