HFU HF Underground
Loggings => HF Mystery Signals => Topic started by: Robot Matrix on March 05, 2025, 0022 UTC
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Saw the carrier for a long time with nothing audible, but later picked up what sounded like a telephone busy signal. As soon as the tones stopped, the carrier dropped. No idea what this is.
(https://i.ibb.co/8gZvjxmr/2025-03-04-17-34-18-Settings.png) (https://imgbb.com/)
Listen here:
http://www.sndup.net/m3pnw