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DISH SETUP: Single sat, Multi-Sat & Motorised
Dish Setup Guides, Information threads and FAQs
Why we can't have an offset dish with circular face (width = height)?
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<blockquote data-quote="a33" data-source="post: 1132934" data-attributes="member: 332642"><p>To add:</p><p>The advantage of an elliptical offset dish (higher than wide) is that the LNB feedhorn can have a circular illumination angle, no matter the LNB skew angle.</p><p></p><p>There are, by the way, circular offset dishes. They don't have a flat dish face, for the paraboloid surface, of course. So sometimes they use a thicker dish rim at the top and at the bottom, so that the dish face at the rim is again flat.</p><p>The actual offset angle of such a circular dish is harder to determine than with a normal elliptical offset dish, which has a perfectly flat dish face.</p><p>Also checking if the dish might be warped, is very very hard (almost impossible), with such a dish.</p><p></p><p>An offset dish normally is not cut out of a prime focus dish, in the sense that first a PF dish is fabricated, and then the offset dish is cut out of it. So for production, a circular offset dish does not have a specific advantage, I would say.</p><p></p><p>Greetz,</p><p>A33</p></blockquote><p></p>
[QUOTE="a33, post: 1132934, member: 332642"] To add: The advantage of an elliptical offset dish (higher than wide) is that the LNB feedhorn can have a circular illumination angle, no matter the LNB skew angle. There are, by the way, circular offset dishes. They don't have a flat dish face, for the paraboloid surface, of course. So sometimes they use a thicker dish rim at the top and at the bottom, so that the dish face at the rim is again flat. The actual offset angle of such a circular dish is harder to determine than with a normal elliptical offset dish, which has a perfectly flat dish face. Also checking if the dish might be warped, is very very hard (almost impossible), with such a dish. An offset dish normally is not cut out of a prime focus dish, in the sense that first a PF dish is fabricated, and then the offset dish is cut out of it. So for production, a circular offset dish does not have a specific advantage, I would say. Greetz, A33 [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Dish Setup Guides, Information threads and FAQs
Why we can't have an offset dish with circular face (width = height)?
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