Numbers stations have been reported since at least the start of World War I and continue in use today. Stations may have set frequencies in the high-frequency band. Most stations have set time schedules, or schedule patterns however, some appear to have no discernible pattern and broadcast at random times. 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. Cuban numbers station HM01 A recording of The Gong numbers station, run by the National People's Army of the German Democratic Republic, from 1988.Ī 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. Problems playing this file? See media help.
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