Эврика, товарищ!
So much for the fridge theory, eh?
How did you stumble upon this revelation? Not only does it have a distinctly Soviet sound to it (and sounds a bit like what international calls to Russia are like on the senders side), but it also sounds mournfully like my alarm clock; A completely dreaded sound. I can't say I've ever heard that, or anything similar while scanning. But this site with all the interval signals is a gem!
I now need my radio.
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