Hello Herman,
Thanks for the reply. The signal on 6290 was very clear from 1605 to 1629, except for some fading at times, nothing bad. I listened continuously to 6290 only, heard at least 2 times the name Studio 52 (not Zeewolf),
then at 1629, I heard your ID, with a strange effect, just like a QRM from a close carrier, then at 1630 there was like a jump, leaving Zeewolf alone, but much less clear than before 1629,
so, at least, something happened around 1630, maybe an alien carrier, maybe a sudden change in the propagation.
Sorry, I missed completely 6423 at that time, no comparison at all, I simply did not try 6423 at that time.
Now the chore : how to edit my posts !
Thanks again for replying,
Ray