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Maximum DB gain for tv uhf amplifier ?

Discussion in 'General Electronics' started by Ed and Donna, May 30, 2004.

  1. Ed and Donna

    Ed and Donna Guest

    Just wondering what is the best amplifier for db gain for uhf
    receptikon.
    Bought a radio sack 10db and it didnt do a thing.

    Thanks

    Ed
     
  2. Ed and Donna

    Ed and Donna Guest

    I would sayit did.
     
  3. Karl Uppiano

    Karl Uppiano Guest

    Maybe the amp didn't have a decent signal to amplify to begin with.
     
  4. Dbowey

    Dbowey Guest

    If it was already a "good" signal, what do you expect to obtain by increasing
    it's amplitude?

    Don
     
  5. Karl Uppiano

    Karl Uppiano Guest

    The main purpose for the type of amplifier that Radio Shack sells is to
    overcome line losses (which is rarely how they're used, which is why they're
    usually not too helpful). You want to put the amp at the "antenna end" of a
    long line, where the signal is presumably strong and clean, so that it's not
    too weak when it reaches the receiver. If you start with a weak, noisy
    signal, an amplifier will just it make a strong noisy signal.
     
  6. Ed and Donna

    Ed and Donna Guest

    So if a picture is snowy a UHF amplifier will do nothing ?
     
  7. Karl Uppiano

    Karl Uppiano Guest

    It depends why the picture is snowy. If the antenna isn't getting a good
    signal, an amplifier won't help, no matter what. If the antenna is getting a
    decent signal, but it's getting lost in the cable, you can put the amplifier
    between the antenna and the cable. It might help. If you put it between the
    cable and the TV, it probably won't help.
     
  8. JeffM

    JeffM Guest

    So if a picture is snowy a UHF amplifier will do nothing ?
    I see no flaws in what Karl has said,
    but he hasn't yet explicitly said *Position the antenna better*.
    Despite being a zero-cost solution,
    it's amazing how many folks overlook this.
    Sometimes moving the antenna a few feet vertically or horizontally
    makes a huge difference.
    It's often just as easy to locate it at the other end of the building
    --and with exceptional results reception-wise.

    Before erecting an antenna on a property,
    a pro would take a survey of field strength on that property.
     
  9. jOE

    jOE Guest

    Is more height always better ?
     
  10. Dbowey

    Dbowey Guest

    jeffm posted:

    <<
    I see no flaws in what Karl has said,
    but he hasn't yet explicitly said *Position the antenna better*.
    Despite being a zero-cost solution,
    it's amazing how many folks overlook this.
    Sometimes moving the antenna a few feet vertically or horizontally
    makes a huge difference.
    It's often just as easy to locate it at the other end of the building
    --and with exceptional results reception-wise.
    ----------

    Yes, but the OP did NOT ask how to improve the signal, which has a multitude of
    possible answers; he asked specifically about the UHF amp.

    One problem with newsboards is the propensity of many people to do a friggin
    brain dump in answer to a simple, straight-forward question. If an OP has more
    extensive questions, let them ask it. Keeps topics ON-topic.

    Don
     
  11. JeffM

    JeffM Guest

    Position the antenna better.
    Not always. Optimal alignment with the incoming signal is the goal.
     
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