The lost signal or UVB-76, also known as "the Buzzer", is the nickname given by radio listeners to a shortwave radio station that broadcasts on the frequency 4625 kHz.
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. The first reports were made of a station on this frequency in 1982. Its origins have been traced to Russia, and although several theories with varying degrees of plausibility exist, its actual purpose has never been officially confirmed and remains a source of speculation.
The station is commonly known as the Buzzer in both English and Russian (ualka). Its official name is not known, although some of the voice transmissions have revealed names which may be callsigns or another form of identification. Up until 2010, the station identified itself as UVB-76 (Russian: УВБ-76) , and it is still often referred to by that name. In September 2010, the station moved to another location, and used the identification MDZhB (Russian: МДЖБ) from then onwards. On December 28, 2015, the station began using the callsign ZhUOZ (Russian: ЖУОЗ) - pronounced "Zhenya, Ulyana, Olga, Zinaida". Since March 1, 2019, the station appears to have used a number of new callsigns, the most recurring of which is ANVF (Russian: АНВФ).
Information taken from Wikipedia.
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