What is that noise/signal on such-and-such frequency?

Unfortunately, I hear this a lot. And I can probably tell you! BUT it’s WAY more fun to try and figure out what it is yourself. That’s one of the fun aspects of amateur radio and shortwave listening. I’ll give you a big hint though. There are sites that list sounds with images and provide the answer to all your strange signal questions. 🙂
I would suggest starting here: https://www.sigidwiki.com/wiki/Signal_Identification_Guide

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