How to get 60hz NTSC tv output from svideo out of video card?

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Under system settings - Display and Monitor module. I have tried 3 different video cards with s-video outputs and the only settings available for the TV-1 output are 50hz or auto. Either way the picture is garbled (unsinked). Why can't I get 60hz NTSC video from the s-video output of my video card? Is this a KDE problem? I am running Suse on one machine and Fedora on another, both with KDE. Same results.