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Sky Digital BSkyB, Freesat & Saorsat support forum
Freesat digital TV support forum
Poor reception on one frequency
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<blockquote data-quote="Terryl" data-source="post: 1155949" data-attributes="member: 369937"><p>One thing it could be is an RF spur on some piece of equipment on that radio mast that is 2.5 Km away from you, or the one closer to you, RF signals are funny, if you have a transmitter with a small problem it could cause what is called a spur, (spurious emission) in some cases this spur could be quit high in RF amplitude, this spur could be higher or lower in frequency from the main signal, if you know the channel frequency your having problems with and the LO frequency of the LNB your using, (look at Ozumo's second sentence in his first post) you could get an idea on what RF signal could be the problem.</p><p></p><p>Another possible problem could be what is called a harmonic, this is two or more RF frequency's mixing together (unintentionally) to produce another unwanted frequency, (or more) these problems would be caused by poor equipment maintenance of the RF equipment. </p><p></p><p>The only way to really see whats going on is to use an RF spectrum analyzer and sweep the RF band, however this type of equipment is very expensive and is not readily available to a consumer. </p><p></p><p>As only one channel is being affected I would suspect it's something close by, and at a strong enough level to get into the LNB it's self, it would have to at just the correct angle to get into the eye of the LNB, or at the correct angle to get a bounce off the dish into the LNB, if it's bouncing off the dish then it has to be to the left or right of the LNB.</p><p></p><p></p><p>Sorry got long winded due to to much coffee.</p></blockquote><p></p>
[QUOTE="Terryl, post: 1155949, member: 369937"] One thing it could be is an RF spur on some piece of equipment on that radio mast that is 2.5 Km away from you, or the one closer to you, RF signals are funny, if you have a transmitter with a small problem it could cause what is called a spur, (spurious emission) in some cases this spur could be quit high in RF amplitude, this spur could be higher or lower in frequency from the main signal, if you know the channel frequency your having problems with and the LO frequency of the LNB your using, (look at Ozumo's second sentence in his first post) you could get an idea on what RF signal could be the problem. Another possible problem could be what is called a harmonic, this is two or more RF frequency's mixing together (unintentionally) to produce another unwanted frequency, (or more) these problems would be caused by poor equipment maintenance of the RF equipment. The only way to really see whats going on is to use an RF spectrum analyzer and sweep the RF band, however this type of equipment is very expensive and is not readily available to a consumer. As only one channel is being affected I would suspect it's something close by, and at a strong enough level to get into the LNB it's self, it would have to at just the correct angle to get into the eye of the LNB, or at the correct angle to get a bounce off the dish into the LNB, if it's bouncing off the dish then it has to be to the left or right of the LNB. Sorry got long winded due to to much coffee. [/QUOTE]
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Sky Digital BSkyB, Freesat & Saorsat support forum
Freesat digital TV support forum
Poor reception on one frequency
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