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Newbie Q - Combining RF outputs

Discussion in 'Misc Electronics' started by Bugsy, Dec 31, 2003.

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  1. Bugsy

    Bugsy Guest

    Apols if you think this is the wrong NG for this - seemed a logical choice
    to me!

    I have a number of Set Top Boxes (Sky,DVD,DTV etc) and I want to pipe the
    output from these around the house.

    I already have a distribution system which allows me to pipe SKYaround the
    house (and feed back remote control signals from other rooms to the stack of
    STB's)

    I can feed the dvd output from the main room to the other rooms using RF.

    However, the more devices I want to distribute using RF the more loss there
    is when they are daisy chained. My question is this. Is there a device which
    allows me to combine outputs from RF devices (4 or 5 of them) so that they
    are effectively in paralell? I guess it's the reverse of an RF
    amplifier/splitter.

    Additionally, I would like the device to allow + 10V through as this is used
    by the TV Link in some of the rooms.

    Sorry if the question seems a bit combersome!

    Thanks,

    Dave
     
  2. Mjolinor

    Mjolinor Guest

    Careful choice of UHF channels and more importantly good quality coax and
    tight coax plugs and you should not have problems with loss of signal until
    you get more than 5 serial items in your chain. There is no easier way to do
    it. Anything else involves multiple wires or really fancy hardware at the
    sending end to only put on 1 UHF channel the thing you want to watch.
     
  3. Some splitters are symmetrical, i.e. they can be used as combiners.
    I've seen really cheap splitters that use just resistors, but most of
    the ones lately use baluns to split. These balun types should work as
    combiners. But I don't know how much of the signals from the other
    three feed back into each source. The nice thing about this, tho, is
    that it's inexpensive to buy a four way splitter and try it out. You
    might even find one along with some coax pigtails for a dollar or two
    at a garage sale or a thrift shop.
    That's probasly not going to happen, because there may be blocking
    capacitors inside the splitters, or worse, the spltter is a DC short
    across each of the coaxes.

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  4. Amos K

    Amos K Guest

    Maybe something from this page will help you out... They are a bit spendy
    but I've installed them in several homes with great success. Notice the
    3x8 Bi-directional video module. You could essential use 6 source using 3
    combiners into the 3 video inputs and have them all amplified.

    http://www.broadbandutopia.com/levaudvidmod.html

    If you don't want to spend that much here is something I learned not long
    ago. Apparently you need to balance the signal inputs to your
    splitter/combiners. If you are lucky enough to have your STB or
    modulators say what level dB signal they are outputing, try inserting an
    attenuator or two inline before the combiner. Say a 3dB or a 6dB. They
    can be found here...

    http://www.hometech.com/video/atten.html

    As far as sending 10V over coax... a lead you can chase is this link...
    http://www.electroline.com/en/products/drop_amplifiers/eda/index.html. I
    have the EDA 2100 and the output says "OUT+PWR+15Db". Power is 15VDC.
    Maybe, just maybe, your unit could handle that. But I'd look for
    something else first.
     
  5. Bugsy

    Bugsy Guest

    My thanks for your comprehensive reply. Maybe when I have sobered up (from
    new year) it will make more sense!

    Thanks again,

    Dave
     
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