[RaelEarl]

Thanks a lot for your efforts!

I should have said that my sample track was another one than the one I did the spectrum analysis on. Simple reason: The track I uploaded was smaller and thus took much shorter to upload than the rather long track I had analyzed myself.

But I also thought it would be interesting to compare different tracks from the same recording. Actually, with small differences they do look rather similar - not very much above the 5000 kHz mark.

So, looking at the categories in use here and at other forums, should I mark this as FM-sourced and then in my info file point to the fact that it is most probably AM or as you say a lo-fi pre-broadcast source?

Well, I've learned something new from you - thank you very much for sharing your expertise! This helps a relative newbie like me a lot!

Have a nice weekend!