Iran War Interrupted by Mysterious Numbers Station
▼ Summary
– A mysterious shortwave radio broadcast in Persian, featuring repeated calls of “Tavajoh!” (Attention) and strings of numbers, began airing twice daily following the start of a US-Israel attack on Iran on February 28.
– An analysis group traced the signal’s origin to a US military transmission facility in Böblingen, Germany, though the broadcaster’s identity and intended audience remain unknown.
– The broadcast exhibits hallmarks of a Cold War-era “numbers station,” an encrypted system historically used by intelligence agencies to communicate covertly with spies.
– Experts explain that such number stations use codes that are indecipherable without a pre-shared codebook, allowing for secure, one-way communication with agents in the field.
– Despite identifying its likely source, the specific purpose and recipient of this transmission are unclear and may remain secret, as the broadcast’s structured nature suggests a planned intelligence operation.
A man’s voice repeats the Persian word for “Attention” before reciting a long, rhythmic sequence of seemingly random numbers. This mysterious shortwave radio broadcast, lasting nearly two hours per session, began airing twice daily just as the U.S.-Israel military campaign against Iran commenced on February 28. The transmission has continued with remarkable regularity, highlighting a shadowy form of communication that has suddenly reemerged in a modern conflict.
Monitoring groups using radio-location techniques pinpointed the broadcast to the 7910 kHz frequency. It airs precisely at 02:00 and 18:00 UTC. Over the weekend, researchers from Priyom, an organization tracking military and intelligence radio use, announced they had likely identified the signal’s source. Through multilateration and triangulation, they traced it to a shortwave transmission facility inside a U. S. military base in Böblingen, Germany. The site is within a restricted training area near Panzer Kaserne and Patch Barracks, with potential technical links to the nearby U. S. Army 52nd Strategic Signal Battalion.
Identifying the broadcast location, however, does not reveal who is sending the messages or who is meant to receive them. The transmission is divided into five or six segments, each beginning with “Tavajoh” before listing numbers in Persian, occasionally interspersed with English words. After five days, radio jammers attempted to block the original frequency, prompting an immediate shift to 7842 kHz the following day. This agile response to interference suggests a coordinated and resilient operation.
Experts believe this broadcast is a modern revival of a Cold War–era system known as a numbers station. These are shortwave transmissions of encrypted numerical codes that sound random to any casual listener. “It is an encrypted radio message used by foreign intelligence services, often as part of a complex operation,” explains Maris Goldmanis, a Latvian historian and researcher of such stations. Their primary function is covert espionage communication, allowing agencies to contact field agents without direct, traceable contact.
“For intelligence agencies, it is important to communicate with their spies to gather intelligence,” says John Sipher, a former CIA officer with 28 years in the National Clandestine Service. “This is not always possible in person due to political constraints or conflict. This is where number stations come in.” While their use dates to World War I, they became prominent during the Cold War. Governments used automated voice transmissions of coded numbers to communicate with agents, a practice documented in declassified KGB and CIA files. These were often Morse code transmissions and could function as two-way systems, with agents reporting back via their own transmitters.
Modern technology offers many encrypted communications options, but number stations retain unique advantages. “Nowadays, you have various satellite and encrypted communications technologies,” Sipher notes. “But during the Cold War and even before that, governments had to find ways to do this without being noticed, and broadcasting coded messages was one way to communicate with your assets discreetly.” The apparent randomness is the point. The strings of numbers can only be deciphered by someone possessing the specific one-time pad or codebook pre-shared with the sender. Without this key, the messages are indecipherable, providing a secure, if archaic, channel.
The purpose and intended recipient of the Iran-related broadcast remain a puzzle. The encrypted and covert design of such transmissions means their full context may stay secret for decades. The broadcast’s highly structured nature, with its fixed schedule and consistent frequency use, strongly indicates it is part of a planned intelligence operation. While the world has moved to digital encryption, this persistent signal from a German base demonstrates that old espionage tools can still find a critical role in new conflicts, sending silent commands into the ether for an audience of one.
(Source: Wired)
