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Sky Digital BSkyB, Freesat & Saorsat support forum
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ITV reception problems
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<blockquote data-quote="rolfw" data-source="post: 2851" data-attributes="member: 175057"><p>To answer your question W Hole, assuming that a receiver has a lower and upper threshold for signal reception, a signal received outside either is unusable.</p><p></p><p>On long runs of cable, the higher signals suffer much greater from loss and so when they arrive at the receiver they fall well below the levels of the lower signals. To enable both sets of signals to fall between the acceptable strength thresholds of the receiver , it is occasionally necessary to equalise them, ie to make sure that they are of similar strengths when they reach the receiver. An analogy (for equalising on terrestrial UHF systems anyway) is the handicapping in a horse race, the expected faster horses carry lead weight so that the lesser horses will be able to keep up and a closer finish is accomplished.</p><p></p><p>I have never yet had to use equalisation on a satellite setup, as very seldom have I had a cable run of more than 50 metres, but I'm sure the situation must arise occasionally.</p><p></p><p>@Channel Hopper You unquestionably have more in depth knowledge than I, if it doesn't equalise by attenuating the lower frequencies, how does it achieve the required results?</p><p></p><p>Rolf</p></blockquote><p></p>
[QUOTE="rolfw, post: 2851, member: 175057"] To answer your question W Hole, assuming that a receiver has a lower and upper threshold for signal reception, a signal received outside either is unusable. On long runs of cable, the higher signals suffer much greater from loss and so when they arrive at the receiver they fall well below the levels of the lower signals. To enable both sets of signals to fall between the acceptable strength thresholds of the receiver , it is occasionally necessary to equalise them, ie to make sure that they are of similar strengths when they reach the receiver. An analogy (for equalising on terrestrial UHF systems anyway) is the handicapping in a horse race, the expected faster horses carry lead weight so that the lesser horses will be able to keep up and a closer finish is accomplished. I have never yet had to use equalisation on a satellite setup, as very seldom have I had a cable run of more than 50 metres, but I'm sure the situation must arise occasionally. @Channel Hopper You unquestionably have more in depth knowledge than I, if it doesn't equalise by attenuating the lower frequencies, how does it achieve the required results? Rolf [/QUOTE]
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Sky Digital BSkyB, Freesat & Saorsat support forum
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ITV reception problems
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