I've been fascinated with these for years, particularly the buzzer (uvb-76), but haven't had the means to listen for myself until recently. Is anyone else here into these, and if so do you have any good frequencies/times to share?
So far my finds are
12653.4 kHz on usb, there's a repeating sequence of four long tones followed by 1, 2, 4 short tones... Then every so often it goes a bit nuts with rapid short beeps and alternating tones.
14215.96 kHz on usb, around 5 or 6 GMT there was an accented voice reading out words "contest contest London Zebra 2 Japan America Lima Zanzibar" and others.
Fun to imagine what these could be.