Sorry... Have you got a link to show us what one of these is???
You can't normally interface a PC directly to a TV Set that way... because the RGB on the SCART runs at a different frequncy to RGB signal from a PC.
I guess you're somewhere in the UK if you're using a SCART lead. I'm very interested in this devce you mention if it allows that to be done. I have a TV frequency RGB Monitor.... effectively an arcade monitor with a case I was thinking about using, but I don't want the expense of an Arcade VGA Card.... which as far as I know at the moment is the only way to get a high quality, correct resolution, image.
Best Regards,
Julian (Fozzy The Bear)