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video camera to two monitors?

Discussion in 'Electronic Repair' started by recolligo, Apr 17, 2007.

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  1. recolligo

    recolligo Guest

    A first time post for an electronics novice, so here goes:

    I am helping a non-profit set up their video camera with two
    monitors. The camera is 10feet away from one monitor and 50ft away
    from another. They are using the camera to show closeups of a cooking
    demonstration, so it's video only, and no sound.

    I don't have the specs on the camera, but I believe it's a Sony, a
    recent (2005 - 6) purchase.

    My objective is to take the feed from the camera using the RCA jacks
    and connect to the monitors. The monitors have RCA and Coax jacks.

    I have to buy something and set it up without any experimentation
    time, so wondering:

    If I use an RCA adapter (splits the single RCA into two cables) to go
    from the camera to the two monitors, will there be noticeable signal
    loss? Do I need a distributor/amplifier?

    Any suggestions or direction much appreciated.

    R.
     
  2. James Sweet

    James Sweet Guest

    You'll probably need a simple amplifier, I think you can buy video
    splitters, otherwise I saw a circuit once that was only one or two
    transistors and a few resistors. You can try just a Y adapter but the
    image will probably be too dark.
     
  3. Yes, there will be loss. Each monitor will only get 1/2 the signal,
    darkening it. You can get a video distribution amp, which will solve
    the problem.

    If these are professional-grade monitors, they may have "looping"
    inputs, where each video connection has an IN and OUT jack. In that
    case you can daisy-chain one monitor to the other and turn off the 75
    ohm termination on the first monitor. This will get you a good signal
    without any amplifiers. It sounds like what you have are probably
    consumer-grade monitors, though, so this probably doesn't help you.
    (Professional ones usually have BNC inputs instead of RCA.)
     

  4. The monitor should have either video loop through which is a pair of
    video connectors, or a switched 75 ohm terminator. The terminator would
    be marked "75 Ohms/Hi-Z" You only terminate the monitor on the end of
    the line. Video is 75 ohms, so you want RG-59 or RG-6 coax.


    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
  5. Stan

    Stan Guest

    }A first time post for an electronics novice, so here goes:
    }
    }I am helping a non-profit set up their video camera with two
    }monitors. The camera is 10feet away from one monitor and 50ft away
    }from another. They are using the camera to show closeups of a cooking
    }demonstration, so it's video only, and no sound.

    First, read the other answers that tell you the right way.

    Done?

    OK, here's how to do it the very CHEAP way.

    Get a free or very cheap, used VCR.

    Feed the camera to the video in; feed the near monitor from the video out.

    Feed the far monitor (assuming it is a TV/monitor) with coax from the VCR
    RF OUT.

    Added bonus: during breaks or pre-show, you can run a pre-recorded
    tape with some type of logo, which will appear on the monitors until
    you're ready to go.

    Stan.
     
  6. If you're using monitors designed for this sort of use they will have
    video in and out connectors. The end one of the daisy chain will terminate
    the line in 75 ohms while the other(s) bridge it at high impedance. Either
    automatically or via user switches.

    If using monitors not designed for this sort of use the best answer is a
    video distribution amp. But so saying try without. You may be able to
    overcome the double termination and consequent loss of video level with
    the monitor controls - to an acceptable degree. It is possible this
    approach will give some ghosting, though.
     
  7. recolligo

    recolligo Guest

    Dave, thanks for the thoughts. R

     
  8. Opening the iris on the video camera wider (or putting it in "high gain"
    mode) sometimes works, too. The nice thing about closed-circuit TV is
    if it looks good enough, it is good enough. ;)

    However, the original poster said the setup had to work right the first
    time, with no experimentation, so he may not be able to risk this kind
    of cut-and-try approach.
     
  9. Ian Jackson

    Ian Jackson Guest

    If you can't connect the first monitor as a loop-through, definitely try
    simply connecting the two monitors in parallel (using the RCA adapter,
    as suggested above). The voltage into each will drop will by about
    3.5dB, and instead of the normal video level of 1V, you will only get
    0.67V. However, this should be well within the 'tweeking' range of the
    monitor controls. It's very unlikely that you will get any noticeable
    ghosting.
    Ian.
    --
     
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