What matters most in a cables ability to carry a video signal accurately?
Tight control over the cable’s impedance from end to end is the most important factor in “analog” video signal accuracy. Analog video signals are the kind used in composite video, component video, s-video, RGB and RGBHV video. Keeping the impedance as close as possible to 75 ohms is the key to a complete signal. Low-grade cables will claim 75 ohms or a “nominal” impedance of 75 ohms but may go as far as 20 ohms above or below 75 ohms.
