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shortwave radio

noun
1.
a radio that transmits or receives shortwaves.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Article for shortwave-radio

shortwave radio

transmission and reception of information by means of electromagnetic waves about 10 to 80 m (33 to 262 feet) in length having frequencies of approximately 29.7 to 3.5 megahertz. During the early 1920s attempts were made to transmit radio signals over long distances by bouncing them off the layers of charged particles in the Earth's ionosphere. The success of these experiments prompted the establishment of worldwide shortwave communication by the late 1930s.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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