This will be a rerun of the presentation Paul gave at the RSGB Convention in October. Please note that (once again) the meeting will take place on the second Monday of the month rather than the first to avoid a clash with the May Day Bank Holiday!
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.[1] 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 also used. Stations may operate on set schedules and frequencies in the high-frequency band, while others broadcast at irregular times.[2]
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