Oh, it's been a while... Here is a short report. Over the last few months I've recorded several shows at different venues and also done tests in various parts and far from the city. And I have this "radio problem" only near my home. :-P So this problem is solved.
But recently (while recording quiet stuff) I've faced another thing. It seems to be some kind of battery issue, cos it happens with both preamp and bbox. It sounds like wind noise (bassy hiss) only in one channel (left with pre and right with bbox). With HPF turned ON on preamp it disappears COMPLETELY. I wonder what will happen if I use EQ to compensate bass reduction on 9200?? Can't do it right now and (sorry) cant post samples, i am on mobile device. But as I remember, the sample no2 from the first post can give an immpression.
And i know that i have to use good batteries. Used Duracell, but maybe it's just a copy. I plan to order Maha rechargables as soon as I can (i see many people recommend them).
And I must add that I like using my 9200 for quiet recordings (with hpf now). Makes difference when comparing to m10 internal preamp.