Hi Rik, My initial thought, too, but the spacing between the tones was also apparently larger than usual. And each of the tones had exactly the same strength, which may happen by conincidence but it'
...yes I saw it too. The WSJT-X spectogram showed nine equispaced lines with distinct little gaps between them, last time at 19:12 on 1373 Hz, in between CQ blocks from DK7FC. Then at 19:14, Stefan w