Radio is a comprehensive and important means of entertainment and communication. On the radio we can listen to news as well as music for advertisements and even product advertisements. Radio is used to exchange information between the army and the police. Radio technology is also used in mobile or cellular telephones. The scientists who contributed to the discovery of radio were Guglielmo Marconi of Italy and Sir Jagadish Chandra Bose of Bikrampur, Bangladesh.
When someone speaks into a microphone in the studio of a radio broadcasting station in Kona, that sound is converted into an electric wave. We can hear frequencies ranging from 20 Hz to 20,000 Hz. So the signal converted from sound to electric wave is also of this frequency. It is associated with high frequency waves for transmission. These high frequency waves are called carrier waves.
This process of attaching a signal to a carrier wave is called modulation. These modulated waves are amplified with amplifiers and propagated around with the help of antennas. These electric magnetic waves or radio waves can be spread far and wide as ground waves or reflected in the atmospheric ionosphere. The antenna inside the radio or consumer device converts these radio waves into electrical waves. It is then separated from the carrier wave using the necessary electronics. This process is called demodulation. The demodulated electrical signal is amplified with an amplifier and sent to the speaker for shining.
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