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Length wire video composite

Discussion in 'Electronic Design' started by ICE, Jul 27, 2005.

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  1. ICE

    ICE Guest

    What is the max length of the video (composite) wire without having
    noticeable picture-quality loss?

    Thanks
     
  2. It depends what you mean by "noticeable picture-quality loss"

    If its just a cheap domestic TV you can probably get away with 50m
    before it gets a even more blurry.
    Check the dB/m loss on say belden cables (google!) at subcarrier
    frequency, ie 3.8 MHz in the US and 4.43MHz in civilised places.
    See how much cable you need to get a 3dB loss at subcarrier, as a rule
    of thumb
    If you use crap cable, you will notice poorer quality pixs on shorter
    cable


    martin
     
  3. Joerg

    Joerg Guest

    Hello Martin,
    Also, you can compensate for increased losses towards higher frequencies
    by high pass filtering. Of course, that won't work for miles of cable
    where the signal is down into the noise.

    Regards, Joerg
     
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