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DISH SETUP: Single sat, Multi-Sat & Motorised
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<blockquote data-quote="a33" data-source="post: 1083572" data-attributes="member: 332642"><p>That would be <strong>John Legon's equation for a parabolic dish. </strong></p><p>It uses the depth at the <em>deepest point</em> of the parabola, and gives focal length of the mother prime focus antenna, that is the distance from focus to vertex (center of the PF dish).</p><p>When you don't know where the vertex lies, just this formula doesn't bring you much further; you need other calculations as well....</p><p></p><p></p><p></p><p>A very good program is <strong>Parabola6 by Strannik</strong>, using inputs width, height, and <em>depth at the center</em> of the dish.</p><p>Downloadable in the first post of this thread: <a href="https://sat-dx.club/viewtopic.php?t=450" target="_blank">Юстировка офсетных антенн. Программа и примеры настройки - Sat-DX.сlub</a></p><p></p><p>As the program is in russian or a similar language, an short explanation by RimaNTSS is here:</p><p><a href="https://www.satellites.co.uk/forums/threads/antennas-focal-point-le-point-g.162669/#post-897786" target="_blank">Antenna's focal point - "le point G" - SatsUK</a></p><p></p><p></p><p></p><p>I also developed a <strong>spreadsheet calculator for parabolic dishes</strong>, having several input possibilities (including the Parabola6 method, that is also my absolute favorite method for flat-dishface dishes).</p><p>I can calculate for you, if you wish (the calculator is not on the internet yet).</p><p>Example of outcome:</p><p></p><p>[ATTACH=full]128523[/ATTACH]</p><p></p><p>And indication of the points, mentioned in the calculator:</p><p></p><p>[ATTACH=full]128522[/ATTACH]</p><p></p><p></p><p>Beware: Some other calculators on the internet are not without faults! The offset part of Parabola calculator 2.0 has faults, and the topstring/bottomstring calculation of satsig.net is wrong.</p><p></p><p></p><p>BTW: For exact outcomes, a depth measurement better be more precise than just 8 (cm? inch?). Better 8.x, or even better 8.xx.</p><p></p><p></p><p>Greetz,</p><p>A33</p></blockquote><p></p>
[QUOTE="a33, post: 1083572, member: 332642"] That would be [B]John Legon's equation for a parabolic dish. [/B] It uses the depth at the [I]deepest point[/I] of the parabola, and gives focal length of the mother prime focus antenna, that is the distance from focus to vertex (center of the PF dish). When you don't know where the vertex lies, just this formula doesn't bring you much further; you need other calculations as well.... A very good program is [B]Parabola6 by Strannik[/B], using inputs width, height, and [I]depth at the center[/I] of the dish. Downloadable in the first post of this thread: [URL='https://sat-dx.club/viewtopic.php?t=450']Юстировка офсетных антенн. Программа и примеры настройки - Sat-DX.сlub[/URL] As the program is in russian or a similar language, an short explanation by RimaNTSS is here: [URL='https://www.satellites.co.uk/forums/threads/antennas-focal-point-le-point-g.162669/#post-897786']Antenna's focal point - "le point G" - SatsUK[/URL] I also developed a [B]spreadsheet calculator for parabolic dishes[/B], having several input possibilities (including the Parabola6 method, that is also my absolute favorite method for flat-dishface dishes). I can calculate for you, if you wish (the calculator is not on the internet yet). Example of outcome: [ATTACH type="full" alt="A33 Triax TD115 new measurement Oct2019.png"]128523[/ATTACH] And indication of the points, mentioned in the calculator: [ATTACH type="full" alt="A33 sat dish calculator 3 .png"]128522[/ATTACH] Beware: Some other calculators on the internet are not without faults! The offset part of Parabola calculator 2.0 has faults, and the topstring/bottomstring calculation of satsig.net is wrong. BTW: For exact outcomes, a depth measurement better be more precise than just 8 (cm? inch?). Better 8.x, or even better 8.xx. Greetz, A33 [/QUOTE]
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DISH SETUP: Single sat, Multi-Sat & Motorised
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