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Re: Tip needed for Coax termination
Keith wrote:
KD> Make sure that all 3 leads are EXACTLY the same length otherwise the
colour
KD> difference signals will arrive before or after the Monochrome
picture detail
KD> giving the impression of the colour slipping to left or right.
That's a bit OTT.
If we assume the speed of propagation in a cable is
2/3 of the speed of light, 200,000,000 m/s, and we're using MPEG2
pictures; one picture element lasts for one 720th of 52 microseconds,
i.e. 72nS, then you need about 14M of cable to delay the signal by 1
pixel.
Assuming that less than 1/4 pixel of colour timing error will
be unnoticeable, then the cables only need to be matched to 3.5M,
which may well be more than the total cable length anyway.
Bill
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