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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
Offset v prime focus chat
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<blockquote data-quote="Vipersan" data-source="post: 782141" data-attributes="member: 325666"><p>..Imo a correctly shaped and set up pf should be as good if not better than an offset of similar size ie 1.8 pf as opposed to 1.8 offset ..</p><p>..and no have no stats to back this claim ...but certainly this appears to be the case in C band.</p><p>Where the offset scores over the PF is its ability to add extra offset lnbs without masking any illumination of the dish..</p><p>Just wanted to join in ;) ...and probably talking garbage except for the last bit..</p><p>all the best m8's</p><p>VS</p><p></p><p>My assumption for making the above claim is that ..since the offset is basicly eliptical ...and the feed is not ..then I would assume that a feed fully illuminating the dish to the top extremity ..is also seeing over the edges to the left and right of the dish surface ..thus picking up background noise ..</p><p>So I assume the feed is set to maximum illumination avoiding seeing over the edges of the dish ..for maximum signal ..and thus doesn't use the entire dish surface ..</p><p>..and thus ..a 1.8 offset sees less than a correctly set up 1.8 pf..</p><p>doh ...my brain hurts...</p></blockquote><p></p>
[QUOTE="Vipersan, post: 782141, member: 325666"] ..Imo a correctly shaped and set up pf should be as good if not better than an offset of similar size ie 1.8 pf as opposed to 1.8 offset .. ..and no have no stats to back this claim ...but certainly this appears to be the case in C band. Where the offset scores over the PF is its ability to add extra offset lnbs without masking any illumination of the dish.. Just wanted to join in ;) ...and probably talking garbage except for the last bit.. all the best m8's VS My assumption for making the above claim is that ..since the offset is basicly eliptical ...and the feed is not ..then I would assume that a feed fully illuminating the dish to the top extremity ..is also seeing over the edges to the left and right of the dish surface ..thus picking up background noise .. So I assume the feed is set to maximum illumination avoiding seeing over the edges of the dish ..for maximum signal ..and thus doesn't use the entire dish surface .. ..and thus ..a 1.8 offset sees less than a correctly set up 1.8 pf.. doh ...my brain hurts... [/QUOTE]
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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
Offset v prime focus chat
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