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UHF tv amplifier plans?

Discussion in 'Electronic Design' started by [email protected], Sep 27, 2006.

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  1. Guest

    Anybody know where I can get a good schematic or kit to build a
    variable UHF television signal amplifier? I need to amplify the UHF
    signals from my roof antenna because they atennuate much more than the
    VHF signals. I tried using amplifiers from Walmart and Target, but they
    are very stupidly designed in that they aren't variable and they
    amplify VHF more than UHF, which is ridiculously stupid and useless.
    Plus they amplify too much, which ruins the picture. I just need a
    small amount of amplification and it has to be variable so I can make
    it just the right amount. I tried googling but so far I only found an
    extremely expensive kit for professional usage.
  2. Guest

    No idea, but I have some suggestions:

    - Try Radio Shack. I purchased a small metal box that amplifies the
    signal. It doesn't distinguish between VHF or UHF, but it is variable.
    I have it setting behind my tv set.

    - If that's not satisfactory, try a splitter to split the VHF and UHF
    signals... then attach an amplifier to the UHF. Although I suspect the
    act-of-splitting will cause losses & a dirtier picture. (That's why
    amps typically amplify the whole spectrum.)

    - Settle for fuzzy UHF stations; being of higher frequency they don't
    travel as far. That's just the way it is.

    - For about ~$10 a month you could subscribe to local-channels-only
    cable, and get everything with crystal clarity.

  3. Dave

    Dave Guest


    1) Spend your money on a better (separate) UHF antenna. You can combine the
    output from VHF and UHF antennas to a single cable, if that is a problem.

    2) Another reason for a poor UHF signal might be the use of low quality
    cable - UHF needs better cable than VHF

    3) If you use an amplifier and the input signal causes it to be overloaded,
    you probably didn't need the amp anyway.

    4) If the amp is not overloaded, but the output overloads the TV, you can
    buy (or make) attenuators that fit in the (output) cable.

    It is always a good idea to start with the best signal you can, and
    attenuate if needed, rather than a poor signal which must then be amplified.

  4. Tam/WB2TT

    Tam/WB2TT Guest

    Channel master sells UHF only amplifiers in two flavors. The one I have is
    stricktly UHF with VHF signals blocked. The other version amplifies UHF, and
    passes VHF un amplified. Any UHF amp is useless, unless it is mounted at the
    antenna. Got mine at .
    If you build your own, you probably will have no way to tell whether the NF
    is 0.8 DB or 8.0 DB.

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