HFU HF Underground
Loggings => HF Mystery Signals => Topic started by: IQ_imbalance on June 08, 2019, 1806 UTC
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These came up at multiple frequencies (although I don't recall if they were concurrent) on the morning of 7 June. Interesting thing is the train on a frequency would cycle up in magnitude and back down again....maybe a directional antenna sweeping around? (https://i.imgur.com/HiXP3Rz.png)