A status maintained where all fixed or mobile radio stations in an area stop transmitting (sometimes limited to certain frequency bands). / The period of time during which this status exists.

The branch of astronomy which utilizes radio waves through the use of radio telescopes to study celestial bodies and occurrences.

Telemetry by use of radio waves.

plural of radio frequency

Of or pertaining to electromagnetic radiation in the radio frequency band of the spectrum.

(uncountable) That part of the electromagnetic spectrum, between about 3 kHz and 300 MHz, within which radio waves are transmitted. / (countable) A frequency in this range.

plural of radio beacon

(communication, aviation, nautical, navigation) A beacon that emits radio wave signals to guide ships or aircraft or to indicate the position of a ship, aircraft, or other object, person, or vehicle.

An alarm clock that includes a radio; a radio alarm clock

(physics) The energy transmitted by radio-frequency electromagnetic radiation