Going back to the original post ... I just can't believe that is 500kw - *only* S9 to 10db over?
I didn't catch where the xmtr is located, but BY to JA would basically be in the direction of North America, so 500kw would have to be louder than that.
Going back in time, that good 'ol Russian Woodpecker back in the '80s was ~500kw (right?) and they were pinning the S meter most of the time. LOUD! So obnoxious, so annoying. I mean, so annoying that you'd rather just turn the radio off kind of loud.
Here in the midwest, in the fall, around sunset, 41 meters is just crammed full of Chinese stations peaking 20db over 9, and they can't all be running more than 50kw or so.
500kw? I dunno. Sounds like some red propaganda to me! =:^]