Radio is the technology using radio waves to carry information, such as sound, systematically modulating the properties of waves of electromagnetic energy transmitted through space, such as amplitude, frequency, phase or Pulse width. When radio waves have reached an electrical conductor, the oscillating fields induce an alternating current in the conductor. The information contained in the waves can be extracted and converted back into its original form.
Radio systems require a transmitter to modulate (select) certain goods of the energy produced to print a sign, for example by using amplitude modulation or angular modulation (which may be frequency modulation or phase modulation). Radio systems also need an antenna to convert electric currents into radio waves and vice versa. You can use an antenna to transmit and receive. The tuned radios resonance circuits allow you to select individual stations. The electromagnetic wave is intercepted by a tuned reception antenna. A radio receiver receives its input from an antenna and converts it into a form usable for the consumer, such as sound, images, digital data, measurement values, navigation positions, etc. Radio frequencies range from 3 kHz to 300 GHz, although commercially significant radio uses use only a small portion of that spectrum.
A radio communication system sends radio signals. The radio equipment involved in the communication systems comprises a transmitter and a receiver each having an antenna and the appropriate terminal equipment, such as a microphone on the transmitter and a loudspeaker in the receiver in the case of a system Voice communication.