The buzzing can be seen in the spectrogram.

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   blinry (blinry@chaos.social)'s status on Monday, 11-Mar-2024 05:22:28 JST blinry

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   37: Listen to The Buzzer

   There's a mysterious Russian station broadcasting at 4625 kHz. Sometimes, it sends encrypted voice messages.

   But usually, all it does is send a honking sound every two seconds, to deter other stations from using the same frequency.

   The purpose of the station is unclear, but most theories think it's military communication.