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Messages - mmcc

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HF Mystery Signals / Mystery Multiplex Signal
« on: September 23, 2024, 1923 UTC »
I see this signal, sometimes for several hundred KHz, sometime for over 1MHz, spanning anywhere from 2MHz-70MHz.



1.  2MHz-70MHz (bandwidth of several hundred KHz to 1MHz)
2.  Visible 24/7
3.  Continous (Can sometimes switch on/off on certain frequencies)
4.  Receiver Mode - N/A
5.  UK
6.  Looks like a multiplex signal.  Has an unstable modulation of around 25Hz.

For reference, here is the audio:
https://www.sigidwiki.com/wiki/Unidentified_Signal_5

Any ideas?

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