Laura, don't know for sure whether it's the same site, I was hoping someone in the group might have more information. This afternoon, Paul Nicholson's http://abelian.org/vlf/spectrum.shtml showed sim
A couple of days ago (Tue Mar 11), the high-power French Navy station came back on 21.75 kHz. This time they did not switch frequency, but continued to transmit on 18.3 kHz simultaneously. I wonder i