Shortwave listening
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Shortwave listening, or SWLing, is the hobby of listening to shortwave radio broadcasts located on frequencies between 1700 kHz and 30 MHz. Listeners range from casual users seeking international news
A Sangean ATS-909 world band receiver
CBS shortwave listening post (May 1941)
WPE shortwave monitor registration certificate c. 1963
Numbers station
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A numbers station is a shortwave radio station characterized by broadcasts of formatted numbers, which are addressed to intelligence officers operating in foreign countries. Most identified stations u
Shortwave listening
…for shortwave utility, or "ute", transmissions such as shipping, sailing, naval, aviation, or military signals, listening for intelligence signals (numbers stations), or tuning in amateur radio stations. Listeners often obtain QSL cards (which confirm contact) from ham operators, broadcasters or utility stations…
The speech/Morse generator (pictured here) is a machine that has been used for many well-known numbers stations.