PdfTeXing with Emacs' TeX input method not working

[H. Dieter Wilhelm]

Hello (),

I'm playing with the TeX input method for better visualising some Calc
formulae from embedded mode.  But when I trying to pdftex the uft8 file
it says:

l.42 \(Ω
          := 120000. rpm\)

! Package inputenc Error: Unicode char \u8:Ω not set up for use with LaTeX.

I did already \usepackage[utf8]{inputenc}, which package or
configuration am I missing?

Thanks a lot
       Dieter
-- 
Best wishes
H. Dieter Wilhelm
Darmstadt, Germany