The 20 KHz of amateur band segmnet (plus more above 10.150 KHz) were completely wiped out by one massive signal. Could this be over-the-horizon radar, and if it is, which one? Regardless, for years of playing with radios, I have never seen/heard such a powerful signal, on any band!
And right there, in the middle of OTHR was one single WSPR signal, wiggling it's way to my receiver. G3020 you've done it again. Amazingly cool stuff !
UPDATE: 3 hours later, with no sky-wave propagation, the OTHR was still loud and clear. A local radar perhaps?
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