found this info on the radion 7000 just read though this thread:
http://forum.mtu.com/showthread.php?...ht=Radeon+7000
It says that the 7000 won't do dual displays but only clones the main display on the s-video out (TV-OUT)
does your computer come with onboard video?
If so there is a work around. set the onboard video card as your primary card. and just hook your rf modulator to the s-video out.