Hi Clive,
The results suggest QMX+ and QLG3 are OK. I suspect that it's caused by interference from another station with similar strength, accurate timing and frequency increase this possibility. You can try a different frequency, at least, we shouldn't see JD38.
Within that 200Hz window, it's more crowed in the middle 100Hz. I used to pick 137 as "my" frequency, until one day, I transmitted for a hour without any reports, I then found out a nearby station was transmitting exactly at 137, 13db strong than mine. I switched to "197" and so far so good.
At the end, maybe only the successfulness of WSPR is to blame.
73, Wei
