UVB-76 is the callsign of a shortwave radio station that usually broadcasts on the frequency 4625 kHz (AM full carrier). It's known among radio listeners by the nickname The Buzzer. It features a short, monotonous buzz tone, repeating at a rate of approximately 25 tones per minute, for 24 hours per day. The station has been observed since around 1982. On rare occasions, the buzzer signal is interrupted and a voice transmission in Russian takes place. Only three to four such events have been noted.
http://googlesightseeing.com/2010/08/%E2%80%9Cthe-buzzer%E2%80%9D-speaks-voice-transmission-confirmed-at-uvb-76/
After 2010, the transmitter is believed to have relocated to Pskov, according to
http://www.astrosol.ch/53790397a40a2bb01/5379039f1a0a31204/index.html
http://uvb-76.net/