Radio

Radio is the transmission of signals by modulation of electromagnetic waves with frequencies below those of visible light.   Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of space.   Information is carried by systematically changing (modulating) some property of the radiated waves, such as amplitude, frequency, or phase. When radio waves pass an electrical conductor, the oscillating fields induce an alternating current in the conductor. This can be detected and transformed into sound or other signals that carry information.

The term radio is also applied to telecommunication technicians with underpinning skill and knowledge encompassing: alternating current theory, radio theory, cellular mobile telephony, radio systems and services, cellular and radio support services, radio installation and maintenance practices; and knowledge of emerging radio or cellular technologies.