What does shortwave mean?
A shortwave is a radio signal or receiver that operates using short wavelengths, conventionally in the high-frequency range of about 3–30 megahertz. Shortwave transmissions can travel long distances because radio waves in this range can be reflected by the ionosphere, a property that made the technology important for maritime communication, aviation, emergency services, and international broadcasting. The word can be used as a noun for a transmission, a frequency band, or a radio set, and as an adjective for equipment or signals that use this system. Although shortwave radio has been overtaken in many applications by satellite communication and internet-based messaging, it remains useful where conventional networks are unavailable and can provide a dependable means of long-distance contact.
A radio transmission, receiver, or communication system that uses short wavelengths, especially frequencies in the high-frequency radio band.
"We received the message on a shortwave set in the cabin."
The word may refer either to the equipment or to a transmission made with it.
Relating to or using radio waves with short wavelengths, especially high-frequency radio communication.
"The aircraft was equipped with a shortwave transmitter."
Often used before words such as radio, receiver, transmitter, or communication.
Usually used for individual shortwave transmissions, receivers, or signals.
"Several shortwaves were detected during the experiment."
Shortwave radio can bounce around the Earth, helping signals travel far beyond the range of ordinary line-of-sight broadcasts.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does shortwave come from?
The compound shortwave developed in the early 20th century from short and wave, with wave referring to radio waves rather than primarily to waves on water. It was used for radio transmissions whose wavelengths were shorter than those of the then-established longwave and mediumwave systems. The expression reflects the early technical classification of radio bands by wavelength and frequency.
How shortwave is actually used
The term is primarily associated with radio and is technical rather than general in everyday use. In British usage, it is also used more broadly for international broadcasting and shortwave reception.
Easily confused with shortwave
Shortwave uses higher radio frequencies and shorter wavelengths, whereas longwave uses lower frequencies and longer wavelengths.
Microwave technology generally uses much shorter wavelengths and higher frequencies, especially in communications, ovens, and radar.