The Russian Pip - 3756 kHz
The Pip is the nickname given by radio listeners to a shortwave radio station that broadcasts on the frequency 5448 kHz by day, and 3756 kHz during the night. It broadcasts short, repeated beeps at a rate of around 50 per minute, for 24 hours per day. The beep signal is occasionally interrupted for voice messages in Russian. The Pip has been active since around 1986, when its distinctive beeping sound was first recorded by listeners. The purpose of The Pip is also not known, although there are many theories. It is often suggested that The Pip is part of a larger radio relay or control system, which also includes The Buzzer and The Squeaky Wheel, which both follow similar formats.