UVB-76.

This is coolbert:

From the conspiracy web site AboveTopSecret we find this gem. Russian radio transmitter of unknown purpose, strangely has stopped.

This is the Russian radio station referred to by amateur radio monitors as UVB-76. Active for decades [almost thirty years] and now GONE!!

"Russian Radio Signal UVB-76 has stopped transmitting.. UH-OH"

"The mysterious Russian shortwave radio 'UWB-76', also known as 'The Buzzer'..."

"...just stopped transmission. This is huge, considering there has been almost NO interruption since 1982. It even survived the cold war."

"This is.............. odd.................."

"UVB-76 is the call sign 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."

You can listen to The Buzzer for yourself! Very odd type of high frequency transmission indeed. And active for almost thirty years non-stop. Again NOW gone! [as of 5 May this year]

Again, transmissions OTHER than "repeating short, monotonous buzz tone" were very rare indeed! Voice messages from UVB-76 were very rare.

"Three or four such messages have been intercepted in over twenty years of observation"

Speculation among the conspiracy theorists was that this was part of the Russian "Perimeter" or "Dead Hand" automatic launch of nuclear assets system? But this seems not to be the case. The explanation is much more prosaic. This was a transmitter used for ionospheric research? NOTHING MORE THAN THAT? Sort of like the explanation given for HAARP in Alaska? Who knows?

Nothing to worry about folks! Just a big nothing!

coolbert.