HFU HF Underground
Loggings => HF Mystery Signals => Topic started by: Dag on July 25, 2021, 0042 UTC
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Fast pips, about 35 pips per episode, pips alternate frequency about 2 kHz apart, episodes last 7 seconds, parallel transmissions on 7121 kHz, 7126 kHz, 7131 kHz, 7166 kHz, and 7171 kHz.
Has been occurring for past 20 minutes as I write this.
Dag