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Satellite TV receivers & systems support forums
Satellite Systems - What to Buy - What to install
Fibo 1.2m v Channel master 1.2m
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<blockquote data-quote="BlindFaith" data-source="post: 900884" data-attributes="member: 378569"><p>[USER=389552]@Riverblue[/USER], you don't have to take the length into account, cos from the satellite an offset dish is seen as a circle.</p><p></p><p>It's only the width that counts. The gain is proportional to the effective area of the dish. Comparing 110cm to 90cm yields a theoretical gain of -> 20log(110/90)= 1,74dB and 80cm /55cm -> 3,25dB</p><p></p><p>[USER=187415]@hvdh[/USER] has described the advantage of a gregorian dish correctly. The effective area is increased due to a more precise illumination. But don't believe in wonders ;)</p></blockquote><p></p>
[QUOTE="BlindFaith, post: 900884, member: 378569"] [USER=389552]@Riverblue[/USER], you don't have to take the length into account, cos from the satellite an offset dish is seen as a circle. It's only the width that counts. The gain is proportional to the effective area of the dish. Comparing 110cm to 90cm yields a theoretical gain of -> 20log(110/90)= 1,74dB and 80cm /55cm -> 3,25dB [USER=187415]@hvdh[/USER] has described the advantage of a gregorian dish correctly. The effective area is increased due to a more precise illumination. But don't believe in wonders ;) [/QUOTE]
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Satellite TV receivers & systems support forums
Satellite Systems - What to Buy - What to install
Fibo 1.2m v Channel master 1.2m
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