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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Focal distance for Elliptical dish
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<blockquote data-quote="BM300" data-source="post: 928560" data-attributes="member: 247938"><p>I copied this for you from another forum.</p><p>Hope it helps.</p><p> </p><p>"In the off set dish ,there are two dimensions, ie antenna height (vertical) and there is antenna width (effective diameter).</p><p>the formula for off set angle= Arc cos(antenna width/antenna height)</p><p>the Antenna height = effective diameter/Cos(offset angle)</p><p>effective diameter = Antenna height X cos (off set angle)</p><p>for example the following are the dimensions of an off set Dish</p><p>1.Height on vertical axis (W) = 500 mm</p><p>2.Effective diameter on Horizontal axis (D)= 460 mm</p><p>3.Depth of the dish (h) = 43 mm</p><p>Focal length = (D*D*D)/ 16*h*W</p><p>= (460x460x460)/(16x43x500)</p><p>=282.95 or 283 mm</p><p>F/D ratio = 283/460 = 0.61</p><p>Hope this will help you."</p><p> </p><p>There are more calcultors here</p><p> </p><p>**<a href="http://www.satellite-calculations.com/" target="_blank">http://www.satellite-calculations.com/</a></p></blockquote><p></p>
[QUOTE="BM300, post: 928560, member: 247938"] I copied this for you from another forum. Hope it helps. "In the off set dish ,there are two dimensions, ie antenna height (vertical) and there is antenna width (effective diameter). the formula for off set angle= Arc cos(antenna width/antenna height) the Antenna height = effective diameter/Cos(offset angle) effective diameter = Antenna height X cos (off set angle) for example the following are the dimensions of an off set Dish 1.Height on vertical axis (W) = 500 mm 2.Effective diameter on Horizontal axis (D)= 460 mm 3.Depth of the dish (h) = 43 mm Focal length = (D*D*D)/ 16*h*W = (460x460x460)/(16x43x500) =282.95 or 283 mm F/D ratio = 283/460 = 0.61 Hope this will help you." There are more calcultors here **[url]http://www.satellite-calculations.com/[/url] [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Focal distance for Elliptical dish
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