HFU HF Underground
Loggings => HF Mystery Signals => Topic started by: dragund on December 08, 2019, 0342 UTC
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Bad audio, but you can make out the horn sounds which don't appear to be interference:
https://clyp.it/y2g3msy1?token=86b5f8e3700bb2ce4f7de7614ccd1777
Just getting started with SDR, so not sure if this waterfall is helpful at all:
(https://i.imgur.com/Zdk2pFY.jpg)