| radio observation | an observation made with a radio telescope |
| clock radio | a radio that includes a clock that can be set to turn it on automatically |
omnirange
omnidirectional range
omnidirectional radio range | a navigational system consisting of a network of radio beacons that provide aircraft with information about exact position and bearing |
| push-button radio | a radio receiver that can be tuned by pressing buttons |
radar
microwave radar
radio detection and ranging
radiolocation | measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects |
radio
wireless | a communication system based on broadcasting electromagnetic waves |
radio antenna
radio aerial | omnidirectional antenna comprising the part of a radio receiver by means of which radio signals are received |
radio beacon
beacon | a radio station that broadcasts a directional signal for navigational purposes |
| radio chassis | a chassis for a radio receiver |
| radio compass | a direction finder that gives a bearing by determining the direction of incoming radio signals |
| radio interferometer | radio telescope that uses interference patterns from two antennas instead of a parabolic antenna |
radio link
link | a two-way radio communication system (usually microwave), part of a more extensive telecommunication network |
radio-phonograph
radio-gramophone | electronic equipment consisting of a combination of a radio receiver and a record player |
radio receiver
receiving set
radio set
radio tuner
wireless | an electronic receiver that detects and demodulates and amplifies transmitted signals |
| radio station | station for the production and transmission of AM or FM radio broadcasts |
radio telescope
radio reflector | astronomical telescope that picks up electromagnetic radiations in the radio-frequency range from extraterrestrial sources |
| radio transmitter | transmitter that is the part of a radio system that transmits signals |
| radio brightness | the strength of a radio wave picked up by a radio telescope |
| radio frequency | an electromagnetic wave frequency between audio and infrared |
| radio astronomy | the branch of astronomy that detects and studies the radio waves emitted by celestial bodies |
radio
radiocommunication
wireless | medium for communication |
| radio broadcast | a broadcast via radio |
| radio news | a radio broadcast of news |
radio beam
beam | a signal transmitted along a narrow path, guides airplane pilots in darkness or bad weather |
| radio beacon | a characteristic signal emitted by a transmitter used for navigation |
| radio noise | static at radio wavelengths |
quasar
quasi-stellar radio source | a starlike object that may send out radio waves and other forms of energy, many have large red shifts |
| radio source | an object that radiates radio waves |
| radio announcer | an announcer whose voice is broadcast on radio |
| radio operator | someone who operates a radio transmitter |
| voicer | a speaker who voices an opinion |
| voicer | someone who regulates the tone of organ pipes |
De Forest
Lee De Forest
Father of Radio | United States electrical engineer who inpatented the first triode vacuum tube, which made it possible to detect and amplify radio waves (-) |
radiopacity
radio-opacity | opacity to Xays or other radiation |
radio wave
radio emission
radio radiation | an electromagnetic wave with a wavelength between . cm to , m |
| radio signal | a radio wave used to transmit and receive messages |
radio spectrum
radio-frequency spectrum | the entire spectrum of electromagnetic frequencies used for communications, includes frequencies used for radio and radar and television |
| radio | transmit messages via radio waves, he radioed for help |
radiopaque
radio-opaque | not transparent to X-rays or other forms of radiation, barium sulfate is radiopaque |
| radio-controlled | operated and guided by radio, a radio-controlled airplane |
| radio | indicating radiation or radioactivity, radiochemistry |