radio beacon noun

An apparatus that transmits signals for direction-finding

radio communication noun

Wireless telegraphy or telephony

radio compass noun

A radio direction-finding instrument

radio fix noun

The identification of a ship's or aircraft's position from radio signals it emits

radio frequency noun

A frequency suitable for radio transmission, about 3kHz to 300GHz (radio-frequency heating heating, such as dielectric heating, by means of a radio-frequency electric current)

radio galaxy noun

A galaxy emitting a particularly high level of radio-frequency energy

radio ham noun (informal)

A radio amateur

radio microphone noun

A microphone with a miniature radio transmitter, and therefore not requiring any cable

radio pill noun

An ingestible capsule containing a tiny radio transmitter that will send out information about bodily processes

radio spectrum noun

The range of radio frequencies

radio star noun

A discrete source of radio waves in outer space, generally corresponding with no visual object and known only by radio astronomy

radio station noun

1. A place where radio transmitters and (if radio-communication is involved) receivers are installed
2. A broadcasting company, association, etc

radio telescope noun

An apparatus for the reception, analysis and transmission in radio astronomy of radio waves from and to outer space

radio wave noun

An electromagnetic wave of radio frequency