Hi Jean-Louis, and Walter. I see a rapid almost cyclical fading on some 136kHz signals immediately after a geomagnetic storm (we have had several minor storms Kp=5 recently), the period usually lengt
Hi J, Ah I understand. MMmm I dont know about that "echo" but I have seen similar effects when two stations (or carriers) operate very close together and ARGO shows a "beat" between them......but a m