Increasing Distance of Coaxial Signal

Discussion in 'Amateur Video Production' started by Steve, Jun 14, 2006.

  1. Steve

    Steve Guest

    I have 13 televisions setup in a daisy chain over three coaxial cables
    (4,4,3). Currently I use them to display a powerpoint presentation from

    a computer. The setup is sending the VGA signal to a converter box ->
    Booster (Amplifier) -> VCR (convert to coax) -> Splitter -> In-line
    boosters. I have also installed amps at each television in the daisy
    chain to boost the siganl. The average distance between the source and
    the first television is approx. 200' and 150' to each additional
    television. I am getting signal but it creates a ghosting stiuation on
    many of the screens. Does anyone have another suggestion to improve the

    signal? Considering the distance cost and amount of coax already
    installed I would prefer not to replace the lines unless I have no
    alternative.

    I have found BNC Snap-in Balum that uses CAT5 to send the signal and
    convert it on each end back to BNC. Has anyone used this type of
    system? How well does it work? Any pros / cons?


    Thanks in advance for suggestions
     
    Steve, Jun 14, 2006
    #1
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  2. Ghosting usually happens if you have a mismatch between cables. TV is 75
    ohms, so make sure you use 75ohm coax. I think computer-cable is something
    like 93 ohms, so that won't do.
    The best solution would be to have a box which amplifies the siganl to a
    couple of volts, and at the tv another box, which attenuates it back to 1
    volt again. That way you can run a long distance.

    cheers

    -martin-
     
    Martin Heffels, Jun 14, 2006
    #2
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