Tell us about the basic principles of transmitting and receiving radio waves

To transmit over long distances the sound frequency vibrations obtained with a microphone, they are “attached” to high frequency electromagnetic vibrations obtained with an electromagnetic generator – signal modulation. A modulated high frequency electromagnetic wave is radiated into space using a transmitting antenna. When this wave hits the receiving antenna of a radio receiver or TV, it generates electrical oscillations in it, exactly repeating the shape of the modulated wave. From the modulated electrical oscillations of high frequency, the “sound” part is distinguished – oscillations of low frequency – signal demodulation.
The electrical vibrations of the audio frequency are converted into sound waves using a speaker (loudspeaker).

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