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Detecting tv interefrences

Discussion in 'Electronic Basics' started by fred, Feb 3, 2004.

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  1. fred

    fred Guest

    There is something very stange in my home: my aerial has
    an amplifier outside on the pole but inside the house I
    need to connect to another amplifier because I want the
    signal to be strong upstairs in all the rooms. The problem
    is that it all works very well except for the frequency
    of my Sky Digibox, which is completely distorted. The
    question is, am I picking up some interference at that
    particular frequecy, or are the amplifiers to blame
    (it happened with 4 different amplifiers from 4 different
    companies). The frequency of the Digibox is 68 and there
    isn't anything I can do to change if like it's possible
    in videos, it seems they have fixed it on this channel.
  2. Art

    Art Guest

    Suspect that the amps either are adding spurious signals causing the
    distortion or it is possible that you are overloading the rf inputs of the
    monitors your using. If the reception of your Digibox is interference free
    without the amps then the amps would be suspect. However if the initial
    quality of the Digibox is distorted you then are just amplifying noise. May
    want to try good quality amps with additional traps or consult with a rf
    tech. I presume that you do not have a signal strength meter to check the
    level of the signal produced bu the RF modulator at the Digibox.
  3. Hi,

    As far a interference is concerned, most installations
    these days have, as well as a TV and satellite box, a VCR
    and possibly a DVD player. This is all a prescription for
    trouble as they 'Speak in Tongues', at the same time and on
    a variety of frequencies.

    With a SKY box though, you should be able to change the
    digibox output frequency as channel 68 is simply the
    default one.

    Try this -

    0 (appears to do nothing)

    and punch in a new number while trying to avoid your
    local TV channels and 36 which is a common video output
    frequency. If that doesn't cure it, then you need to look
    at the amount of gain you are using. More is not
    necessarily better in this case.

    Cheers - Joe
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