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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
Extension Petals
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<blockquote data-quote="Waveguide" data-source="post: 875710" data-attributes="member: 364636"><p>I have never considered adding reflector area in a few places as a solution to</p><p>increase signal quality. To get a good match to the feedhorn properties is a</p><p>lottery with small chances to win. There are many ways to ruin things and</p><p>only one way to get good results. </p><p> </p><p>I have planned to do tests in a completely different area, reducing the influence</p><p>of the metal structures supporting the LNB. The three metal rods to the focal</p><p>point will cause diffraction and some signal losses. When the weather permits</p><p>I will compare carbon fibre tubes to the metals tubes used now. Carbon fibre</p><p>is a fairly good absorbant of microwaves and the influence of the coax to the</p><p>LNB can be reduced running it inside one of the carbon fibre tubes. First I must get</p><p>signal strength measurements working, the changes will be small but a quick</p><p>test showed a change of 0,2-0,3 dB when adding a fourth rod to the dish.</p><p>The daily variation is just as big so it needs some work to separate that from</p><p>the influence of the three rods.</p><p>Adding absorbant to the metal LNB holder is another test that my be done.</p><p>(I've got a well-filled scrapbox of absorbants. Hard to find otherwise.)</p></blockquote><p></p>
[QUOTE="Waveguide, post: 875710, member: 364636"] I have never considered adding reflector area in a few places as a solution to increase signal quality. To get a good match to the feedhorn properties is a lottery with small chances to win. There are many ways to ruin things and only one way to get good results. I have planned to do tests in a completely different area, reducing the influence of the metal structures supporting the LNB. The three metal rods to the focal point will cause diffraction and some signal losses. When the weather permits I will compare carbon fibre tubes to the metals tubes used now. Carbon fibre is a fairly good absorbant of microwaves and the influence of the coax to the LNB can be reduced running it inside one of the carbon fibre tubes. First I must get signal strength measurements working, the changes will be small but a quick test showed a change of 0,2-0,3 dB when adding a fourth rod to the dish. The daily variation is just as big so it needs some work to separate that from the influence of the three rods. Adding absorbant to the metal LNB holder is another test that my be done. (I've got a well-filled scrapbox of absorbants. Hard to find otherwise.) [/QUOTE]
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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
Extension Petals
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