UVB-76 is a shortwave radio station that broadcasts on the frequencies 4625 and 4810 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.
About UVB-76 in brief
UVB-76 is a shortwave radio station that broadcasts on the frequencies 4625 and 4810 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 Buzzer has apparently been broadcasting since at least 1973 as a repeating two-second pip, changing to a buzzer in early 1990. It briefly changed to a higher tone of longer duration on January 16, 2003, but has since reverted to the previous tone pattern. Since March 1, 2019, the station appears to have used a number of new callsigns, the most recurring of which is ANVF. The station transmits using AM with a suppressed lower sideband, but it has also used full double-sideband AM. 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 buzzing tones lasted approximately 0. 8 seconds each. 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.
On October 17, 2016, TheBuzzer broadcast at least 18 different messages in less than 24 hours. Since around the beginning of 2020 more frequent messages have been heard. Four voice broadcasts could be heard between January 13 and January 27, 2020. On May 11, 2020, two messages were heard, one at 13: 11 UTC and a second one at 15: 22 UTC. On June 17, 2020,. one message was heard at 10: 12 UTC: On July 1, 2020 and July 8,2020, from 07: 40 UTC to 14:40 UTC, the Buzzer broadcast 13 different messages. On July 30, 2020, three messages were seen at 11: 20 UTC, a second. one at 12: 16 UTC and the third message at13: 14 UTC: An example of such a message: At 21: 00 UTC on December 24, 1997: 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. On August 21 2020, a very long message with a very short message with an open microphone was heard. on August 22 2020, one message with four long messages was heard, at 17: 25 UTC.