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My collection of homemade Antennas for KU
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<blockquote data-quote="casser" data-source="post: 542293" data-attributes="member: 264731"><p>Sorry for only replying now..i´m in vacation.</p><p></p><p>I dont have detailed plans to build this antenna...because it ´s so simple.</p><p></p><p>-They need less gain (or diameter) to equal a satellite dish, example:</p><p>a 20cm diameter cone equal´s to a 30 cms satellite dish...or a 32dBi conical horn equal´s to +-70cm diameter dish.</p><p>BUT a 32dBi conical horn should have 40cms diameter and 2.6meter long! the diameter/lenght it´s not proporcional, a 20cm diameter have 40cm in lenght (optimum), but a 40cm diameter conical horn doesnt have 80cm. </p><p></p><p>-Conical Horn are less critical in construction error´s..satellite dish antennas need´s a perfect construction to center the focal point</p><p></p><p>-Since 25dBi it´s OK to receive >52dBW satellite..this conical horn should have -3dB of 8º degrees...you will be able to receive two satellites at distance of 2/3º with strong reception with only one LNB (since the satellites use +-10º diference of LNB rotation)</p><p></p><p>-i have <a href="http://www.satellites.co.uk/satellite/instala%E7%F5es-de-antenas-frequ%EAncias-dos-sats/105176-testes-uma-antena-sem-ser-parab%F3lica-5.html" target="_blank">HERE</a> a complete explanation how to design a conical horn using HDLANT (a very simple but perfect freeware, thanks to Paul Wade) but only portuguese, try to translate that section, if you need help just ask.</p><p></p><p></p><p></p><p>here you have some of my simulations of conical horn´s (see link)..i didint try bigger conical horn´s, because i think that no one wants to build >1.5meter long conical horn.</p><p></p><p>-Those dimensions, will work in any frequency...i have use it in 2.4ghz, off course it´s not the perfect dimensions for 2.4ghz...but yet, it performed very well. </p><p></p><p>-You can use any LNB with any feed dimension...but should take off the cap of the LNB to put together cone + feed LNB. </p><p></p><p></p><p>_http://img373.imageshack.us/img373/746/semttulois9qv7.jpg</p></blockquote><p></p>
[QUOTE="casser, post: 542293, member: 264731"] Sorry for only replying now..i´m in vacation. I dont have detailed plans to build this antenna...because it ´s so simple. -They need less gain (or diameter) to equal a satellite dish, example: a 20cm diameter cone equal´s to a 30 cms satellite dish...or a 32dBi conical horn equal´s to +-70cm diameter dish. BUT a 32dBi conical horn should have 40cms diameter and 2.6meter long! the diameter/lenght it´s not proporcional, a 20cm diameter have 40cm in lenght (optimum), but a 40cm diameter conical horn doesnt have 80cm. -Conical Horn are less critical in construction error´s..satellite dish antennas need´s a perfect construction to center the focal point -Since 25dBi it´s OK to receive >52dBW satellite..this conical horn should have -3dB of 8º degrees...you will be able to receive two satellites at distance of 2/3º with strong reception with only one LNB (since the satellites use +-10º diference of LNB rotation) -i have [url=http://www.satellites.co.uk/satellite/instala%E7%F5es-de-antenas-frequ%EAncias-dos-sats/105176-testes-uma-antena-sem-ser-parab%F3lica-5.html]HERE[/url] a complete explanation how to design a conical horn using HDLANT (a very simple but perfect freeware, thanks to Paul Wade) but only portuguese, try to translate that section, if you need help just ask. here you have some of my simulations of conical horn´s (see link)..i didint try bigger conical horn´s, because i think that no one wants to build >1.5meter long conical horn. -Those dimensions, will work in any frequency...i have use it in 2.4ghz, off course it´s not the perfect dimensions for 2.4ghz...but yet, it performed very well. -You can use any LNB with any feed dimension...but should take off the cap of the LNB to put together cone + feed LNB. _http://img373.imageshack.us/img373/746/semttulois9qv7.jpg [/QUOTE]
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