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UVB-76, aka "The Buzzer" is a radio transmission of Russian origin with unknown purpose. It is listed on that site, link below:

https://priyom.org/military-stations/russia/the-buzzer

At the time of this writing, as the Russian invasion of Ukraine is on-going, rampant jamming of the buzzer is occurring. The buzzer can be listened to hear:

https://www.youtube.com/watch?v=fUgzv-8_EMc

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You can listen to it in real time using WebSDR. It's on 4625 kHz so just go to a European WebSDR instance[0] and enter 4625, use mode USB (upper sideband)

[0]: http://websdr.ewi.utwente.nl:8901/

The jamming of UVB-76 is primarily done by pirates and is not new since the Ukrainian conflict. It’s been going on for many years.

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