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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
CM 2.4mtr offset
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<blockquote data-quote="blobber" data-source="post: 475052" data-attributes="member: 245194"><p>In practice the recommended feed horn will not suddenly cut off at the visual area of the dish. It will be designed to make the best compromise between capturing the most signal from the dish, while at the same time avoiding ground noise from around it. If the installation has an unusually large amount of such ground noise, I am suggesting it could upset that balance, and shift the optimum towards capturing less from the area towards the dish edge.</p><p></p><p>I also wonder if sidelobes could be an additional concern with a dish as crowded around as this.</p><p></p><p>There is a good description of the issues chapters 4 & 5 of this book:</p><p><a href="http://books.google.com/books?id=RrNx3H9pbTQC&pg=PA72&dq=feedhorns&sig=FeVy8wi8noN980aHbe-RLlR-kow" target="_blank">http://books.google.com/books?id=RrNx3H9pbTQC&pg=PA72&dq=feedhorns&sig=FeVy8wi8noN980aHbe-RLlR-kow</a></p></blockquote><p></p>
[QUOTE="blobber, post: 475052, member: 245194"] In practice the recommended feed horn will not suddenly cut off at the visual area of the dish. It will be designed to make the best compromise between capturing the most signal from the dish, while at the same time avoiding ground noise from around it. If the installation has an unusually large amount of such ground noise, I am suggesting it could upset that balance, and shift the optimum towards capturing less from the area towards the dish edge. I also wonder if sidelobes could be an additional concern with a dish as crowded around as this. There is a good description of the issues chapters 4 & 5 of this book: [URL]http://books.google.com/books?id=RrNx3H9pbTQC&pg=PA72&dq=feedhorns&sig=FeVy8wi8noN980aHbe-RLlR-kow[/URL] [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
CM 2.4mtr offset
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