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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
Help with assembling the big dish
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<blockquote data-quote="dxsat" data-source="post: 415296" data-attributes="member: 193607"><p>Patmos,</p><p>A LNBF will never work properly with a prime focus dish. You will need to adapt it by cutting off the front, the inbuilt feed, then you need to attach it to an Invacom adjustable feedhorn. You have to reduce to F/D ratio from 0.6 typical of a LNBf to around 0.4. </p><p>Noise figures are very misleading with LNBs. Many LNBs described as 0.2dB are nothing of the kind. Performance of the Invacom LNBf models is only average, except in cross- polar isolation, where they excel. The C120 Invacom quad excels in all every aspect, and is worth the money.</p></blockquote><p></p>
[QUOTE="dxsat, post: 415296, member: 193607"] Patmos, A LNBF will never work properly with a prime focus dish. You will need to adapt it by cutting off the front, the inbuilt feed, then you need to attach it to an Invacom adjustable feedhorn. You have to reduce to F/D ratio from 0.6 typical of a LNBf to around 0.4. Noise figures are very misleading with LNBs. Many LNBs described as 0.2dB are nothing of the kind. Performance of the Invacom LNBf models is only average, except in cross- polar isolation, where they excel. The C120 Invacom quad excels in all every aspect, and is worth the money. [/QUOTE]
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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
Help with assembling the big dish
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