On the shortwave frequency 4625 kHz, a mysterious radio station has been broadcasting almost continuously since the 1970s. Twenty-four hours a day, seven days a week, it emits a monotonous buzzing sound - a harsh, repetitive "bzzzt-bzzzt-bzzzt" that has earned it the nickname "The Buzzer." The station identifies itself with the call sign UVB-76 (more recently MDZhB). For decades, nobody knew its purpose. Then, occasionally, the buzzing stops. A male voice reads a series of Russian words and numbers - names like "Anna," "Nikolai," "Roman," followed by numbers. Then the buzzing resumes. UVB-76 is one of the most enduring mysteries of the shortwave radio world.
The Signal: Tune to 4625 kHz on a shortwave radio, and you will hear it: a repeating buzzing tone, approximately 25 tones per minute, that has been broadcasting for over 40 years. The signal originates from a transmitter near the village of Kerro in western Russia. On rare occasions - sometimes months apart - the buzzer stops and a voice reads messages in Russian. The messages typically consist of a call sign and a short sequence of numbers or code words.
📜 The History of UVB-76
UVB-76 was first detected by radio enthusiasts in the late 1970s. In its early years, it broadcast a simple two-tone beep. In the early 1990s, this changed to a continuous buzzing tone that has remained largely unchanged ever since. The station's call sign was originally UVB-76, though it has changed several times over the decades. In 2010, the station temporarily went silent for the first time in its recorded history. Radio enthusiasts around the world were stunned. Then, after 24 hours, it returned - but something had changed. The transmitter had been moved. The signal now originated from a different location, suggesting the entire operation had been physically relocated. In 2014, during the Russian annexation of Crimea, the Buzzer became unusually active. Voice messages were broadcast with greater frequency. Some observers connected this to the political and military situation, suggesting the Buzzer was being used to communicate with Russian military units.
🤔 What Is the Purpose of UVB-76?
📡 1. A Military "Dead Hand" System
The most dramatic theory is that UVB-76 is part of Russia's "Perimeter" system - a doomsday device also known as "Dead Hand." This system is designed to automatically launch nuclear missiles if a nuclear attack destroys the Russian leadership. The Buzzer serves as a "heartbeat" signal. If it stops, it means something catastrophic has happened, and the system should prepare to retaliate. The occasional voice messages are tests or status updates.
📻 2. An Ionospheric Research Station
A more prosaic explanation is that UVB-76 is used to study the ionosphere. By broadcasting a constant signal and monitoring how it propagates through the atmosphere, scientists can gather data about solar activity and its effects on radio communications.
🕵️ 3. A Military Communications Channel
The most widely accepted theory is that UVB-76 is a Russian military communications network. The constant buzzing serves as a "channel marker" - a way of claiming the frequency and ensuring it is always available for emergency use. The voice messages are coded instructions to military units or intelligence operatives. The system is always on, always waiting, always ready.
📍 The Location
For years, radio enthusiasts traced UVB-76's signal to a military facility near Povarovo, a small town northwest of Moscow. In 2011, an urban exploration group visited the abandoned transmitter site. They found a military-looking compound with a radio tower, underground bunkers, and a building filled with old radio equipment. A logbook they discovered recorded transmissions dating back years. The site appeared to have been hastily abandoned. Since the relocation, the exact current transmitter location has been harder to pinpoint, but it is believed to be near the village of Kerro in the Leningrad region.
"Mikhail. Dmitri. Zhenya. Boris. 67. 29. 54. 18."
Conclusion: UVB-76 continues to buzz. Day and night, year after year, the signal pulses across the shortwave spectrum - a mechanical heartbeat from a secretive Russian military installation. Whether it is a doomsday trigger, a scientific experiment, or simply a military channel marker, the Buzzer has become a fixture of the shortwave world. As long as it continues to transmit, radio enthusiasts will continue to listen, waiting for those rare moments when the buzzing stops and a voice speaks from the silence.