"The broadcast has been playing twice a day on a shortwave frequency since the start of the US-Israel attack on Iran on February 28. According to Priyom, an organization which tracks and analyses global military and intelligence use of shortwave radio, using established radio-location techniques, the broadcast was first heard as the US bombing of Iran began."
"Using multilateration and triangulation techniques, the group traced the signal to a shortwave transmission facility inside a US military base in Böblingen, southwest of Stuttgart, Germany. The site lies within a restricted training area between Panzer Kaserne and Patch Barracks, with technical operations possibly linked to the US army's 52nd Strategic Signal Battalion, headquartered nearby."
"The two-hour-long transmission is divided into five to six segments, each lasting up to 20 minutes. Each opens with "Tavajoh!" before shifting into a string of numbers in Persian, sometimes punctuated with an English word or two."
"Radio communication experts believe the broadcast is likely part of a Cold War-era system known as number stations."
A shortwave broadcast featuring a man's voice announcing numbers has been airing since the US-Israel attack on Iran began on February 28. The broadcast occurs twice daily on the 7910 kHz frequency and has been traced to a US military base in Böblingen, Germany. The transmission consists of segments that open with "Tavajoh!" followed by numbers in Persian. Radio jammers attempted to block the frequency, leading to a shift to 7842 kHz. Experts suggest this may be linked to Cold War-era number stations.
Read at WIRED
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