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  • #494700

    John James
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    5th September 2018

    Need a little help here.

    We have two televisions either end of the house supplied by cable from the satellite on roof.

    The first television is fitted with a splitter to provide service to the other end. Each television has its own sky box.

    Signal strength is good on the satellite but poor on the receiving ends probably because a neighbour’s tree is in its path.

    Can anyone recommend a good amplification system that might help solve this problem.

    Thanks.

    PS – This might be easier than asking the neighbour to cut down his tree!

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    #494714

    John James
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    Bit of a rethink here – the signal is average but it’s the picture quality (breaking up etc) that’s the real problem.

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    #494724

    officer crabtree
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    Have you checked the LNB and all the connections?

    Perhaps Mr BartyB will be along to give you proper advice :good:

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    #494726

    BartyB
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    Okey dokey

    2 boxes working off a single split cable will NEVER work correctly for UK TV, because of the number of channels available the full range of signal possibilities is used (see below for the detailed explanation) you should always use a cable for each box running direct from a multi-output LNB on the dish. It may well be that the splitter is the cause of the problem, if you are using a square boxy type device then these have a resistance and often reduce both strength and quality.

    Amplifiers for any radio signal are intended to overcome long cable runs rather than poor signal although if the signal quality is excellent then you may improve the strength with an amplifier, an amplifier will never improve the signal quality. …….. Sorry, it’s move the dish or chop the tree.

     

    Why you can’t run 2 boxes off a single satellite cable:

    Because of the huge amount of services available on satellite, the downlead cannot supply all of the channels from the satellite dish at any one time. Depending on which channel you pick, the receiver will send commands up to the LNB (low noise block) to alter between a quarter of the channels at any one time. Each of the four quarters are called Vertical Low, Vertical High, Horizontal Low, Horizontal High and the receiver altering the supply voltage between 13V and 18V will change the LNB request from Vertical to Horizontal and a 22KHz tone will alter between a high and low band.

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    #494827

    John James
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    Barty B That was just so helpful.

    We started by totally disconnecting the second television and taking off the splitter. Up until this point we had 50% signal strength and about 15% quality picture – ie lots of buffering. We then added a small signal amplifier to the cable just before it entered the skybox. Signal went up to 100% and picture quality between 35-45%. Not enough to totally stabilise the picture but enough to make you want to watch it.

    Over the next few days we’re going to take down the cabling around the house to the second television and use it to mount a second satellite dish on the other end of the house to directly feed into this second television using about 15 metres of cable – hopefully this won’t need amplification. So, as you have advised, in the end both will have a separate satellite.

    The direction for the second satellite will be directly between two trees without any branches getting in the way – so when it’s connected we’ll be able to see exactly how much of a problem the first tree is. It’s a very large poplar which stands in a field just the other side of our boundary. If there’s a very strong gale, its direct line of fall is over our roof  so we’re going to put our neighbour under a bit of pressure to fell it anyway to give us a bit of sleep when the wind blows!

    Anyway, thanks again for your help – it was very much appreciated.

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