UVB-76

Rare card · No. 42033

UVB-76 (Russian: УВБ-76; see § Name and callsigns for other callsigns), also known by the nickname "the Buzzer", is a shortwave radio station that broadcasts in upper sideband mode on the frequency of 4625 kHz (wavelength of 64.8 m). It broadcasts a short, monotonous buzz tone (), repeating at a rate of approximately 25 tones per minute, 24 hours per day. Sometimes, the buzzer signal is interrupted and a voice transmission in Russian takes place. While its true purpose has never been revealed, the transmission is not related to the Dead Hand system, despite being sometimes referred to as Doomsday Radio. It has been interrupted and stopped many times yet no retaliatory response – nuclear weapons nor intercontinental ballistic missiles (ICBMs) – has been launched as a result. The best-supported theory is that it is part of a military command network for the Leningrad Military District of Russia.

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