http://www.dvbshop.net/product_info.php/info/p59_RGB-J2-Extension-for-Techno...
As far as the explaining text and the chart of that extension show, this extension does not have a) a protection for the card (for overvoltage, static electricity and so on, which can easily lead to a dead expensive FF DVB-s card) b) no correction to get the signals videoconform and as the signals you can get from jp2 are not meeting the standards it easily can happen that your expensive tv won't give you nice video quality at all with this setup. Cause of that I would not recommend it.
Regards, Norbert