> In the local station should be the ?? receiver, a PIC for counting
> and calculating the "real world speed" (conversion from actual
> speed in scale 1:160 to speed in 1:1) and presentation on a LCD

How much room have you got in a 1:160 wagon ? I guessed about
50-60mm x 20mm ?? I'd heard 2mm = 1ft. There are UHF data
modules that are small and cheap. For example the TX434A (14mm
square) and RX434A about half-way down this page

http://www.oatleyelectronics.com/whatsnew.html

I'm using the 433MHz version for a data link, great with a decent
antenna



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