clock radio |
a radio with a built-in clock that can be set to turn the radio on at a given time. |
quasi-stellar radio source |
see "quasar." |
radio astronomy |
the study of the universe by observation and analysis of extraterrestrial radio waves. |
radio beacon |
a stationary source of radio waves that emits a distinctive signal as a navigational aid for ships and aircraft. |
radio compass |
a navigational aid consisting of a radio receiver that determines the transmission direction of incoming radio waves. |
radio galaxy |
a galaxy that emits a large amount of radio energy. |
radio spectrum |
the portion of the electromagnetic spectrum consisting of radio waves, esp. those most frequently used in radio and television broadcasting, from ten kilohertz to 300 gigahertz. |
radio station |
an organization equipped for broadcasting radio. [2 definitions] |
radio telescope |
a concave reflector or array of reflectors designed to collect and focus extraterrestrial radio waves for analysis. |
radio wave |
an electromagnetic wave with a wavelength of between one millimeter and thirty thousand meters, or a frequency of between ten kilohertz and three hundred thousand megahertz. |