Radio is the technology of signaling and communicating using radio
waves. Radio waves are electromagnetic waves of frequency between 30
hertz (Hz) and 300 gigahertz (GHz). They are generated by an
electronic device called a transmitter connected to an antenna which
radiates the waves, and received by a radio receiver connected to
another antenna. Radio is very widely used in modern technology, in
radio communication, radar, radio navigation, remote control, remote
sensing and other applications.In radio communication, used in radio
and television broadcasting, cell phones, two-way radios, wireless
networking and satellite communication among numerous other uses,
radio waves are used to carry information across space from a
transmitter to a receiver, by modulating the radio signal (impressing
an information signal on the radio wave by varying some aspect of the
wave) in the transmitter. In radar, used to locate and track objects
like aircraft, ships, spacecraft and missiles, a beam of radio waves
emitted by a radar transmitter reflects off the target object, and the
reflected waves reveal the object's location. In radio navigation
systems such as GPS and VOR, a mobile receiver receives radio signals
from navigational radio beacons whose position is known, and by
precisely measuring the arrival time of the radio waves the receiver
can calculate its position on Earth. In wireless radio remote control
devices like drones, garage door openers, and keyless entry systems,
radio signals transmitted from a controller device control the actions
of a remote device.Applications of radio waves which do not involve
transmitting the waves significant distances, such as RF heating used
in industrial processes and microwave ovens, and medical uses such as
diathermy and MRI machines, are not usually called radio. The noun
radio is also used to mean a broadcast radio receiver.Radio waves were
first identified and studied by German physicist Heinrich Hertz in
1886. The first practical radio transmitters and receivers were
developed around 1895â€"1896 by Italian Guglielmo Marconi, and radio
began to be used commercially around 1900. To prevent interference
between users, the emission of radio waves is strictly regulated by
law, coordinated by an international body called the International
Telecommunications Union (ITU), which allocates frequency bands in the
radio spectrum for different uses. Radio Biography, NetWorth, Height, Age, Weight, Family, Married, Son, Daughter