Perfetto ho risolto. Il problema sta nel file .pdf_tex. In questo la figura veniva richiamata senza la sotto cartella.
`%% Creator: Inkscape 0.48.1, http://www.inkscape.org
%% PDF/EPS/PS + LaTeX output extension by Johan Engelen, 2010
%% Accompanies image file 'FIGURA1.pdf' (pdf, eps, ps)
%%
%% To include the image in your LaTeX document, write
%% \input{
%% instead of
%% \includegraphics{
%% To scale the image, write
%% \def\svgwidth{
%% \input{
%% instead of
%% \includegraphics[width=
%%
%% Images with a different path to the parent latex file can
%% be accessed with the `import' package (which may need to be
%% installed) using
%% \usepackage{import}
%% in the preamble, and then including the image with
%% \import{
%% Alternatively, one can specify
%% \graphicspath{{
%%
%% For more information, please see info/svg-inkscape on CTAN:
%% http://tug.ctan.org/tex-archive/info/svg-inkscape
\begingroup
\makeatletter
\providecommand\color[2][]{%
\errmessage{(Inkscape) Color is used for the text in Inkscape, but the package 'color.sty' is not loaded}
\renewcommand\color[2][]{}%
}
\providecommand\transparent[1]{%
\errmessage{(Inkscape) Transparency is used (non-zero) for the text in Inkscape, but the package 'transparent.sty' is not loaded}
\renewcommand\transparent[1]{}%
}
\providecommand\rotatebox[2]{#2}
\ifx\svgwidth\undefined
\setlength{\unitlength}{362.71779785pt}
\else
\setlength{\unitlength}{\svgwidth}
\fi
\global\let\svgwidth\undefined
\makeatother
\begin{picture}(1,0.4089348)%
\put(0,0){\includegraphics[width=\unitlength]{FIGURA1.pdf}}%
\put(0.05717792,0.3211952){\color[rgb]{0,0,0}\makebox(0,0)[lb]{\smash{Trasm.}}}%
\put(0.07354733,0.06989559){\color[rgb]{0,0,0}\makebox(0,0)[lb]{\smash{Ric.}}}%
\put(0.12761577,0.19588053){\color[rgb]{0,0,0}\makebox(0,0)[lb]{\smash{Radar}}}%
\end{picture}%
\endgroup`
e si vede benissimo che manca la subdirectory
`\includegraphics[width=\unitlength]{FIGURA1.pdf}`
Io ovviamente ho modificato con
`\includegraphics[width=\unitlength]{IMMAGINI/FIGURA1.pdf}`
Infine tra i vari tentativi ho installato anche TexLive e devo dire che mi ha convinto ad abbandonare definitivamente MikTex.
Vi ringrazio
Ciao
Daniele