DISCLAIMER: I have no association with UVB-76 station, neither do I have any clue what is the content I am relaying. I can only assure, that the signal is received on 4.625MHz AM-modulated 900km NW from supposed origin and retransmitted unaltered. In no way can I guarantee this service, nor be considered responsible of any content re-transmitted. The only purpose for this relay to exist is because lot of people who do not have equipment or are located too far from station seem to be interested about listening to it. Should the UVB-76 station- or transmission content owners feel violated in any way, please contact me at uvb76.repeater@gmail.com and we will work it out.

Note, that because of shortwave radio signal propagation specifics the station can be more or less reliably received from around 4pm to 6am GMT on summertime. It is almost 24h audible during the winter, with short "skip-zone" blank-out around 6pm GMT.

The USB feed is considered as main source of audio today, as the voice messages are much better audible there than on the AM stream. However, the buzzer sound from the AM stream is somewhat more pleasant to listen at, so both feeds are kept simultaneously.

Friday, April 11, 2014

Help Saving the Shukhov Radio Tower in Moscow

We have all enjoyed the mysteries of radio communication, would it be through unknown signals, number stations or just surfing the shortwaves in hope to find something inspiring. Now it is time to help preserving the very piece of the history of radio.

Please take time and sign the online petition to help saving this beautiful landmark in Moscow!


The tower seems to be falling a victim of real estate development and so far the Russian State Committee for Television and Radio has given in to government and agreed to demolish it.
World leading architects are trying to give a support for those fighting for the tower and signed an open letter for saving the tower. However, any signature worldwide can be a step closer for saving it!

Saturday, January 18, 2014

MoonBounce Serenade: Recording

Here is the recorded audio feed of the concert:

Tuesday, January 14, 2014

MoonBounce Serenade

I am proud to be part of the MIMProject.org atrist group and as we are specialized on technological art forms, my engineering hobby meets my art hobby quite often.
So it happened, that when we were asked to represent Estonia at the EBU annual Art's Birthday event on January 17'th, we decided to create something different.

Therefore, on January 17'th 2014 at 19.40-20.00UTC, we are about to create a largest music delay device ever attempted! And to accomplish this, we have teamed up with radio amateurs across the world and using the object no larger than .. our Moon! 

Simply put, the pieces of music will be transmitted to the moon using one of the most powerful 2.32GHz amateur transmitters for that purpose in existence, what just happens to be located in Estonia, at ES5PC (radio amateur callsign). The transmitter looks like this:

Moon will reflect the signal back and after traveling more than 768 000 km roundtrip, it will be received at the listening station of DL0SHF in Germany, where it is relayed back to us over internet, at . The receiver looks like this:

This will make the whole setup a huge 2.7sec delay line with some added effects (lot of noise and distortion..).

The catch? Moon is incredibly poor reflector for radio waves, so the signal will be attenuated by 281dB. If this number does not look too terrifying, lets represent it the other way: the signal arrives back 1258925411794167214239541063.958 times weaker ...

For those interested to listen how it all turns out, the live feed to the EBU show can be reached at http://klassikaraadio.err.ee/kuula and the time to listen is January 17'th 2014, at 19.40-20.00UTC

Monday, September 23, 2013

Local Interference on 4626kHz

Reception of the UVB-76 signal on 4625kHz has been disturbed for last two weeks or so by an unknown noise source. I have had no luck figuring out what it is so far, but it does look like a network-over-powerline thing someone could be using at the neighborhood. 

Judging from 24-hour waterfall pictures it has no relation to shortwave propagation effects (i.e. has to be relatively local) and does not change in frequency nor time, so it cant be from street lighting, phone charger gone grazy, plasma TV etc. It is also apparent with other radios I have, so it is also not the equipment at the streamer.

The noise stripe is repeating itself after every 50kHz from 2MHz to around 6MHz effectively rendering my shortwave capabilities to nil and does not seem to have plans for going away, so I'll have to start searching for the source!

Wednesday, November 7, 2012

Tracking Ship "Kosmonavt Yuri Gagarin"

Running this site is all about the radio and mysterious signals. However, if there is a picture what would summarize everything I ever wanted to do with my life, then this is pretty much it:

The sea, the space, the radio, technology, science, mystery, journey .. you name it, its all there. The largest ever built space tracking ship, Kosmonavt Yuri Gagarin was a foundation to a prominent fleet called "Space Marine Fleet" (Morskoj Kosmicheskij Flot) of the USSR.

Built at the Baltic Shipyard in Leningrad (now St. Petersburg) on 1971, the technical facts are:

  • 11 decks
  • lenght: 231.6 m 
  • beam: 32 m 
  • displacement: 45 000 tons 
  • engines: two 9000 hp steam turbines
  • speed: 18 knots. 
  • crew: 136 seamen + 212 mission specialists
In total, the ship had 75 different antennas, most spectacular of which were two 25 meter parabole dishes. The tracking system of the huge dishes involved not only directing the antennas, but also keeping the entire ship steady in desired position and angle - the act reportedly possible up to gale 5 winds.

Surprisingly, the fleet of tracking ships did formally belong to a USSR Academy of Sciences rather than Ministry of Defense. However, the military had a de facto command over the ships.

The misson for the space fleet was to help tracking the Russian (and in some cases also other countries, such as US on the Sojuz-Apollo mission) space missions. Since the ground stations can not track the space objects beyond horizon, these ships were extending the communication capabilities significantly, relaying data to ground stations. 

The ships were therefore performing a long missions and covering considerable distances, visiting many different ports around the world and creating lot of admiration around.

The specifics to mission were also reflecting on facilities on a ship - 1250 different rooms, more than 100 labs and workshops, library, 300-seat lecture hall, football field, three swimming pools etc. were all there to keep the crew fit for a task, once the long waiting was over. 

The advances in communication and signal processing technology, as well as economy constraints, have put most of the ships of this kind out of service and to scrap. It is more practical to run a satellite-to-satellite links rather than try capturing everything on earth. The very same space-race she helped to run, became also a reason for her becoming obsolete.

Kosmonavt Yuri Gagarin was sold to scrap metal after a dispute between Ukraine and Russia, where Russia had no finances to keep the ship, but Ukraine, although claiming her as part of the Black Sea fleet after the collapse of USSR, had no use nor resources to operate her. 

So it happened, that the most beautiful and prominent of all the space fleet tracking ships was sold to India for a $170 a ton...

I compiled all the photos I have about this ship to a video. Its good for daydreaming, what was the communications world like before it all became about satellite links and WiFi!

Monday, October 15, 2012

Dual Buzzer

There has been several reasons to speculate that more than one buzzer exists and that there could be more than one transmitting location.
The recent short appearance of the second buzzer signal on 4622kHz on 12'th of October 2012 leaves no doubt, that both statements hold true.

The second signal is present for about 7 to 8 hours at around till 12.00pm to 7.30pm UTC. Please note, that this appears in parallel to a signal on 4625.
Also the fading characteristics at the 4622 signal are entirely different from the 4625, while the fading characteristics of the latter is as it appears normally.

Thursday, October 4, 2012

Streamer Back in Business

Just to let you know that the streamer is back in business and stable now, with archives and 24-hour screen capture etc. working as before! There is a gap in archives for August and September what I will try closing some time later, but about a week worth of recordings from September 2012 is permanently lost I'm afraid. Happy Hunting!