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Satellite TV receivers & systems support forums
Fringe Reception General
Anyone tried to make BIG dish at home?
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<blockquote data-quote="driver" data-source="post: 741112" data-attributes="member: 295515"><p>hi all you do it yourself enthusiasts,</p><p></p><p>the focal length is one half the radius of the dish.</p><p></p><p>the cord that the dish represents can be divided centrally.</p><p></p><p>the angles can be calculated using trig.ie depth of cord length.</p><p></p><p>suppose two triangles within the cord.</p><p></p><p>extend to ,along radius, two larger triangles.</p><p></p><p>now you have a kite.four similar triangles.of equal angles.</p><p></p><p>the radius hence found, being the total length of the base off the larger</p><p></p><p>triangles + the hight of the smaller triangles.</p><p></p><p>the focus point is half this distance ,due to the divide by two action of the reflection from the tangent on the perimeter of the dish/cord</p><p></p><p>did you get that lol</p><p></p><p></p><p>cheers<img src="https://www.satellites.co.uk/styles/default/xenforo/smilies/smile.png" class="smilie" loading="lazy" alt=":)" title="Smile :)" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="driver, post: 741112, member: 295515"] hi all you do it yourself enthusiasts, the focal length is one half the radius of the dish. the cord that the dish represents can be divided centrally. the angles can be calculated using trig.ie depth of cord length. suppose two triangles within the cord. extend to ,along radius, two larger triangles. now you have a kite.four similar triangles.of equal angles. the radius hence found, being the total length of the base off the larger triangles + the hight of the smaller triangles. the focus point is half this distance ,due to the divide by two action of the reflection from the tangent on the perimeter of the dish/cord did you get that lol cheers:) [/QUOTE]
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Fringe Reception General
Anyone tried to make BIG dish at home?
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