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Sky Signal Strengh & Plasma.

Discussion in 'Plasma TVs' started by briandzo, May 18, 2003.

  1. briandzo

    briandzo
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    Has anyone ever retweaked their Sky sat dish
    to improve the signal strengh.

    If so did they notice an improvement in the
    quality of the sky broadcast.

    My sky signal strengh is currently registering at 50%.
    although the sky picture is good.
    sometines very good.
    i know there is room for improvement.

    & im kind of wondering whether the above may help a little...

    Anyone tried this ?
     
  2. symanski

    symanski
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    Signal strength now relates to how good the Sky box is receiving digital information, and it's that digital information that contains picture information. When you've got a low signal, you will get stuttering picture and sound as well as blocks cascadingly failing on the picture. It's very different to a weak analogue picture!

    When the Digitbox received the picture, it has a description of how the picture should be. It then builds that image and displays. With the analgue system, the information transmitted was the picture and could have interference, such as ghosting, added to the picture. Weak signals would also give you a grainy picture.

    That's not to say that a strong signal is any less important. Just that digital TV has one advantage over analogue - the ability to remove noise incurred during the transmission path on receipt. There's so much encoding and even the way it's encoded allows for more information to be recovered in noisy environments that it's really quite amazing.

    Poor Sky pictures have more to do with a lower bit rate when the picture was being encoded. Compare BBC News 24 to the God Revival channel (one that nobody would normally watch and therefore has a low bit rate). Bit rates for channels also vary, giving advertisers priority, so some channels may drop in quality.

    All the best,

    Dr John Sim.
     

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