In radio navigation systems such as GPS and VOR, a mobile receiver accepts 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 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 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. Radio is very widely used in modern technology, in radio communication, radar, radio navigation, remote control, remote sensing, and other applications. They are generated by an electronic device called a transmitter connected to an antenna which radiates the waves, and received by another antenna connected to a radio receiver. Radio waves are electromagnetic waves of frequency between 30 hertz (Hz) and 300 gigahertz (GHz). Radio is the technology of signaling and communicating using radio waves. Antennas of both kinds are shown here, along with round dishes and drums for point-to-point microwave communications (for example from studio to transmitter). FM and television transmitting antennas are often located on high towers or mountain peaks, to maximize transmission range. G.A variety of radio antennas on Sandia Peak near Albuquerque, New Mexico, US. On 6.772 m for image, and 7.06 m for soundДЄ tune was playing or the radio was playing?ДЄcross television, radio and the InternetДЄin't that mister mister on the radio, stereoДЄncient generals, lacking modern technologies such as radioДЄudience/audiences/the audience Д«y the 1930s, radio communication was comingД¬apacities of the new media for radio program productionД¬ooper had been responsible for Cassandra's radio denunciation of P. to transmit (a message) to (a person, radio station, etc) by means of radio wavesД®tymology: 20 th Century: short for radiotelegraphy.( modifier) (of a motor vehicle) equipped with a radio for communication.of, concerned with, using, or operated by radio frequencies: radio spectrum.( modifier) of, relating to, employed in, or sent by radio signals: a radio station.short for radiotelegraph, radiotelegraphy, radiotelephone.( modifier) relating to, produced for, or transmitted by sound radio.the occupation or profession concerned with any aspect of the broadcasting of sound radio programmes.the broadcasting, content, etc, of sound radio programmes: he thinks radio is poor these days.Also called (esp Brit): wireless an electronic device designed to receive, demodulate, and amplify radio signals from sound broadcasting stations, etc.the use of electromagnetic waves, lying in the radio-frequency range, for broadcasting, two-way communications, etc.radio- is also used to mean 'x-rays'': radiograph radiotherapy.radio- is also used to mean 'the giving off of rays as a result of the breakup of atomic nuclei'': radioactivity radiocarbon.radio- is also used to mean 'radio waves'': radiolocation.radio- is attached to roots and nouns and means 'radiant energy'': radiometer.radio- comes ultimately from Latin radius, meaning 'beam, ray.''.The pilots radioed the tower that they needed to land. Radio and Televisionto send a message to (a person) by radio: The pilots radioed the tower.The pilots radioed that they were under attack. Radio and Televisionto send (a message, music, etc.) by radio: The pilots radioed for help.Radio and Televisionrelating to, used in, or sent by radio: radio messages.broadcasting by radio to others: on the radio between midnight and 6 in the morning.having been broadcast through radio waves and received by a radio: She first heard the news on the radio.Radio and Television the business or industry of sending signals to be heard by an audience.Radio and Television a device for receiving or sending radio broadcasts.Radio and Television a system of communicating speech or other sounds by sending electromagnetic waves of a particular frequency range over long distances.o /Л€reЙЄdiЛЊoКЉ/ USA pronunciation n., pl.

Radio reference