Concept

Numbers station

Summary
A numbers station is a shortwave radio station characterized by broadcasts of formatted numbers, which are believed to be addressed to intelligence officers operating in foreign countries. Most identified stations use speech synthesis to vocalize numbers, although digital modes such as phase-shift keying and frequency-shift keying, as well as Morse code transmissions, are not uncommon. Most stations have set time schedules, or schedule patterns; however, some have no discernible pattern and broadcast at unpredictable times. Stations may have set frequencies in the high-frequency band. Numbers stations have been reported since at least the start of World War I and continue to be in-use today. Amongst amateur radio enthusiasts there is an interest in monitoring and classifying numbers stations with many being given nicknames to represent their quirks or origins. History According to the notes of The Conet Project, which has compiled recordings of these transmissions, number
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