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Broadcast areaRussia, Soviet Union (Former)
Frequency4625 kHz Shortwave
First air datec. 1973
FormatRepeated buzzing sound
Former callsignsУВБ-76, МДЖБ, ЖУОЗ
Former frequencies4625 kHz
OwnerRussian Armed Forces
Sister stationsThe Pip, The Squeaky Wheel

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.[1][2] It broadcasts a short, monotonous About this soundbuzz tone , repeating at a rate of approximately 25 tones per minute, 24 hours per day.[1] Sometimes, the buzzer signal is interrupted and a voice transmission in Russian takes place.[3] The first reports were made of a station on this frequency in 1973.


The station is commonly known as the Buzzer[4] in both English and Russian (Russian: Жужжалка). 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 adopted the identification MDZhB (Russian: МДЖБ). On December 28, 2015, the station began using the callsign ZhUOZ (Russian: ЖУОЗ) – pronounced "Zhenya, Ulyana, Olga, Zinaida". From March 1, 2019, the station appears to be using a number of new callsigns, the most recurring of which is ANVF (Russian: АНВФ).


External video
UVB-76 in 1976 on YouTube
UVB-76 in 1982 on YouTube
UVB-76 in 1989 on YouTube
A spectrum for UVB-76 showing the suppressed lower sideband.

The station transmits using AM with a suppressed lower sideband (R3E), but it has also used full double-sideband AM (A3E). The signal consists of a buzzing sound that lasts 1.2 seconds, pausing for 1–1.3 seconds, and repeating 21–34 times per minute. Until November 2010, the buzz tones lasted approximately 0.8 seconds each.[1][5] One minute before the hour, the repeating tone was previously replaced by a continuous, uninterrupted alternating tone, which continued for one minute until the short repeating buzz resumed, although this stopped occurring in June 2010.[6]

The Buzzer has apparently been broadcasting since at least 1973[7] as a repeating two-second pip, changing to a buzzer in early 1990.[7][8] It briefly changed to a higher tone of longer duration (approximately 20 tones per minute) on January 16, 2003, but it has since reverted to the previous tone pattern.[citation needed]

Voice messages[edit]

Sometimes the buzzing sound is interrupted and a voice message is broadcast. These messages are usually given in Russian by a live voice, and follow a fixed format.[1][9][10] An example of such a message:

At 21:00 UTC on December 24, 1997:

Ya UVB-76, Ya UVB-76. 180 08 BROMAL 74 27 99 14. Boris, Roman, Olga, Mikhail, Anna, Larisa. 7 4 2 7 9 9 1 4

Voice messages were thought to be very rare, until 2010 when listeners reported increased activity of the station, spurring on further monitoring and allowing listeners to "catch" more of the messages which would have otherwise gone unnoticed.[11] On June 5, 2010, UVB-76 went silent for approximately 24 hours, resuming the normal buzzing pattern on the morning of June 6. At 13:35 UTC on August 23, 2010, a voice message was broadcast:

UVB-76, UVB-76. 93 882 NAIMINA 74 14 35 74. 9 3 8 8 2 Nikolai, Anna, Ivan, Mikhail, Ivan, Nikolai, Anna. 7 4 1 4 3 5 7 4

On October 17, 2016, The Buzzer broadcast at least 18 different messages in less than 24 hours.[12]

Unusual transmissions[edit]

Frequently, distant conversations and other background noises have been heard behind the buzzer, suggesting that the buzzing tones are not generated internally, but are transmitted from a device placed behind a live and constantly open microphone. Because of the occasional fluctuating pitch of the buzzing tones it is supposed that the buzzing tones are generated by a tonewheel as used in a Hammond organ. It is also possible that a microphone may have been turned on accidentally.[13] One such occasion was on November 3, 2001, when a conversation in Russian was heard:[5]

Я – 143. Не получаю генератор... ...идёт такая работа от аппаратной.

On November 11, 2010, intermittent phone conversations were transmitted and were recorded by a listener (at 14:00 UTC) for a period of approximately 30 minutes. These conversations are available online, and seem to be in Russian.[14][15] The phone calls mentioned the "brigade operative officer on duty", the communication codes "Debut", "Nadezhda" (Russian for "hope", both a noun and a female name), "Sudak" (an alternate name for the Zander, and also a town in Crimea) and "Vulkan" (volcano). The female voice says:

Офицер дежурного узла связи "Дебют", прапорщик Успенская. Получила контрольный звонок от Надежды... ...поняла.

On July 17, 2015, the station broadcast what appeared to be a RTTY signal in lieu of the buzzer.[16][17][18]

On February 7, 2019, several transmissions that were likely sent by a third party were broadcast. One of them goes:

Ya - Pogrom, Ya - Pogrom. Vozduh. 49 832 VOLKOSTYK 12 38 86 52

Location and function[edit]

The purpose of the station has not been confirmed by government or broadcast officials. However, the former Minister of Communications and Informatics of the Republic of Lithuania Rimantas Pleikys has written that the purpose of the voice messages is to confirm that operators at receiving stations are alert.[6][19][20] Other explanations are that the broadcast is constantly being listened to by military commissariats.[21]

There is speculation published in the Russian Journal of Earth Sciences which describes an observatory measuring changes in the ionosphere by broadcasting a signal at 4625 kHz, the same as the Buzzer.[22]

It is also speculated that the voice messages are some sort of Russian military communications, and that the buzzing sound is merely a "channel marker" used to keep the frequency occupied, thereby making it unattractive for other potential users.[1] The signature sound could be used for tuning to the signal on an old analogue receiver. The modulation is suitable to be detected by an electromechanical frequency detector, similar to a tuning fork. This can be used to activate the squelch on a receiver. Due to the varying emission properties on short-wave bands, using a level-based squelch is unreliable. This also allows a signal loss to be detected, causing an alarm to sound on the receiver.

Another theory, described in a BBC article, states that the tower emits a “Dead Hand” signal that triggers a nuclear retaliatory response if Russia were hit by a nuclear attack.[4]

There are two other Russian stations that follow a similar format, nicknamed "The Pip" and "The Squeaky Wheel". Like the Buzzer, these stations transmit a signature sound that is repeated constantly, but is occasionally interrupted to relay coded voice messages.[1]

The former transmitter was located near Povarovo, Russia,[1][23] at 56°5′0″N 37°6′37″E / 56.08333°N 37.11028°E / 56.08333; 37.11028 which is about halfway between Zelenograd and Solnechnogorsk and 10 kilometres (6.2 mi) northwest of Moscow, near the village of Lozhki. The location and callsign were unknown until the first known voice broadcast of 1997.[24] In September 2010, the station's transmitter was moved to the nearby city of Saint Petersburg, near the village of Kerro Massiv. This may have been due to a reorganization of the Russian military. Prior to August 9, 2015, the station is not transmitted from the Kerro Massiv transmitter site ("Irtysh") anymore, possibly due to a reorganization of the Russian military for the particular area which may cause the frequency to be used only in the Moscow Military District. At present, The Buzzer appears to be broadcast only from the 69th Communication Hub in Naro Fominsk, Moscow.[3] In 2011, a group of urban explorers explored the abandoned buildings at Povarovo.[25][26] They claim that it is an abandoned military base. A radio log record was found, confirming the operation of a transmitter at 4625 kHz.[25][27]

Other callsigns[edit]

Besides the main callsign, there have been transmissions containing different callsigns such as: LNR4 (Russian: ЛНР4), 87OI (Russian: 87ОИ), VM62 (Russian: ВМ62), A1JZh (Russian: А1ЙЖ), MSZh7 (Russian: МСЖ7), OMP4 (Russian: ОМП4), 7U8T (Russian: 7У8Т), VLHN (Russian: ВЛХН) and 217O (Russian: 217О).

See also[edit]


  1. ^ a b c d e f g "The Buzzer". October 2014. Retrieved October 1, 2014.
  2. ^ "Numbers Station Research". The NSRIC. Retrieved February 21, 2015.
  3. ^ a b Peter Savodnik (September 27, 2011). "Inside the Russian Short Wave Radio Enigma". Wired. Retrieved October 7, 2011.
  4. ^ a b Gorvett, Zaria. "The ghostly radio station that no one claims to run". Retrieved 2017-08-04.
  5. ^ a b Boender, Ary (January 2002). "Oddities". ENIGMA 2000 Newsletter – Issue 8. Retrieved 2009-05-06.
  6. ^ a b "Russian HF Beacons". Thirty-second edition of the N&O column / Spooks newsletter. 2000-12-24. Retrieved 2010-08-26.
  7. ^ a b "Morse Stations". Seventy-fifth edition of the N&O column / Spooks newsletter. 2004-08-02. Retrieved 2010-08-27.
  8. ^ Boender, Ary (1995). "Numbers & oddities: Column 1". World Utility News.
  9. ^ "El misterio de las emisiones de radio secretas", ABC, August 26, 2010 (English)
  10. ^ Russia (2009-07-21). ""The Buzzer" (UVB-76) – Google Sightseeing". Googlesightseeing.com. Retrieved 2012-10-09.
  11. ^ Newitz, Annalee, "They're broadcasting those Russian numbers again", ion9, August 27, 2010
  12. ^ Priyom.org [@priyom_org] (17 October 2016). "Today's extraordinary Russian military channel marker message stats: - Buzzer: 18 - Pip: 20 - Wheel: 21 - 5292: 0" (Tweet) – via Twitter.
  13. ^ "Mysteriózní rádio už 30 let vysílá záhadný signál a teď i tajnou šifru", Technet.cz, August 27, 2010 (English)
  14. ^ "UVB-76 2010-11-11 14.00 UTC". Retrieved 11 October 2012.
  15. ^ "Translation by a Reddit user". Retrieved 3 August 2014.
  16. ^ "The Buzzer has changed sound?". reddit.
  17. ^ "UVB-76 (The Buzzer) appears to be sending out a RTTY-like signal right now. Anyone care to decode it?". reddit.
  18. ^ "UVB76 with RTTY". Retrieved 3 January 2019.
  19. ^ "Single letter markers – posts from the SPOOKS and WUN listservers". 2000. Archived from the original on 2007-11-25. Retrieved 2008-08-29.
  20. ^ Pleikys, Rimantas (1998). Jamming. Vilnius Lithuania: Rimantas Pleikys.
  21. ^ "Военная "Жужжалка" на частоте 4625 кГц. "Buzzer" UVB-76. – Страница 4". Radioscanner.ru. Retrieved 2012-10-09.
  22. ^ "Information-measuring complex and database of mid-latitude Borok Geophysical Observatory". 2008. Retrieved 2012-02-10.
  23. ^ Geere, Duncan (August 2010). "Mysterious Russian 'Buzzer' radio broadcast changes". WIRED.CO.UK. Retrieved 2010-09-12.
  24. ^ "El misterioso zumbido de la estación de radio UVB-76" [The mysterious buzz of the UVB-76 radio station]. El Reservado (in Spanish). January 24, 2011. Archived from the original on January 27, 2011. Retrieved January 31, 2011.
  25. ^ a b O'Callaghan, Jonathan (2014-12-31). "Can YOU solve the mystery of UVB-76?". Daily Mail. Retrieved 2016-07-03.
  26. ^ wasd. "kwasd's blog " Небольшой фотоотчет с УВБ-76 ("The Buzzer", "Жужжалка")". Blog.kwasd.ru. Archived from the original on September 10, 2012. Retrieved 2012-10-09.
  27. ^ "www.numbers-stations.com/media/sample-uvb76-logbook.pdf" (PDF). 2014-09-22. Retrieved 2016-07-03.

Further reading[edit]

  • Handler, Stephen (December 2013). "Is Russia's Buzzer a Doorbell to Doomsday?". Popular Communications. 32 (4): 31–33. ISSN 0733-3315.

External links[edit]