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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
Seeking advice on Astra 2D optimising
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<blockquote data-quote="archive10" data-source="post: 634065"><p>Update and Feedhorn adjustment question:</p><p></p><p>Just as you gentlemen say, the LNB Maplin sold me matches the dish only in the size of the clamp (40mm), not in F/D. The Invacom Universal SNH-031 has a fixed F/D of about 0.55, whereas the Fortec has an F/D of about 0.38. No wonder I can't get any decent reception despite the size of the dish.</p><p></p><p>Re the dish - it is not suitable for Scanwegian weather - it is (as kitschcamp points out) rusting like there is no tomorrow. But I am only renting for about 6 monhts more, so it is a temporary solution in any case.</p><p></p><p>The LNB is being returned to Maplin, I've purchased a C120 flange Twin Invacom TWF-031 instead, with Invacom ADF-120 Feedhorn from Satbuyer.co.uk. </p><p></p><p>Amazingly, the feedhorn comes with no installation instructions at all, and no markings on it at all to guide the correct setting of F/D to match my dish.</p><p></p><p>Question 1: Can anyone suggest how I figure out where the "baffles" part of the feedhorn should be positioned for a F/D of about 0.38?</p><p></p><p>Question 2: I know the focus point ought to be about 684 mm out from the base of the dish. Where on the Feedhorn should this be? at the tip?</p><p></p><p>thanks,</p><p></p><p>St1</p></blockquote><p></p>
[QUOTE="archive10, post: 634065"] Update and Feedhorn adjustment question: Just as you gentlemen say, the LNB Maplin sold me matches the dish only in the size of the clamp (40mm), not in F/D. The Invacom Universal SNH-031 has a fixed F/D of about 0.55, whereas the Fortec has an F/D of about 0.38. No wonder I can't get any decent reception despite the size of the dish. Re the dish - it is not suitable for Scanwegian weather - it is (as kitschcamp points out) rusting like there is no tomorrow. But I am only renting for about 6 monhts more, so it is a temporary solution in any case. The LNB is being returned to Maplin, I've purchased a C120 flange Twin Invacom TWF-031 instead, with Invacom ADF-120 Feedhorn from Satbuyer.co.uk. Amazingly, the feedhorn comes with no installation instructions at all, and no markings on it at all to guide the correct setting of F/D to match my dish. Question 1: Can anyone suggest how I figure out where the "baffles" part of the feedhorn should be positioned for a F/D of about 0.38? Question 2: I know the focus point ought to be about 684 mm out from the base of the dish. Where on the Feedhorn should this be? at the tip? thanks, St1 [/QUOTE]
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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
Seeking advice on Astra 2D optimising
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