Microphone installed in the radio studio, converts sound vibrations into electrical current, which is called a current of low frequency.

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Typically, this current is very weak, so it is amplified and low frequency wire is fed to the transmitter.

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Often used instead of a microphone recorder, allowing you to transfer pre-recorded tape transfer.
Microphones, tape recorders, amplifiers, low frequency and the necessary auxiliary equipment located in the broadcasting center from which all being transmission.

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Transmitter generates the high frequency vibrations, which, after exposure to low frequency current are fed to the device for emission of electromagnetic waves in space, called the radio station. High-frequency currents excite the antenna into the surrounding space electromagnetic waves or, alternatively, the radio waves.