Random Wiki entry of the day: UVB-76 (txt) 
"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. In rare occasions, the buzzer signal is interrupted and a voice transmission in Russian takes place. Only three such events have been noted. There is much speculation; however, the actual purpose of this station remains unknown."
http://en.wikipedia.org/wiki/UVB-76
"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. In rare occasions, the buzzer signal is interrupted and a voice transmission in Russian takes place. Only three such events have been noted. There is much speculation; however, the actual purpose of this station remains unknown."
http://en.wikipedia.org/wiki/UVB-76
