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DISH SETUP: Single sat, Multi-Sat & Motorised
Dish Setup Guides, Information threads and FAQs
Multifeed installation and exact calculation of LNB position
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<blockquote data-quote="a33" data-source="post: 969044" data-attributes="member: 332642"><p>Coming back to this topic:</p><p></p><p>After finding the following topic on a russian forum, I find that I am partly wrong in my conclusions about multifeed brackets: <a href="https://translate.google.nl/translate?hl=en&sl=ru&u=http://www.sat-expert.com/forum/showthread.php%3Ft%3D20176&prev=search" target="_blank">Google Translate</a></p><p></p><p>My assumptions about a multifeed bracket best being straight in the horizontal plane, and the aiming of an offset LNB to a "horizontal G-spot" seem to be correct.</p><p></p><p>My assumption about the calculation of LNB-distances for straight brackets seems to be highly incorrect, though.</p><p>In the above topic it is found that that LNB-distance is </p><p>a) <strong>linear</strong> to the azimuthdifference, and</p><p>b) <strong>smaller</strong> than the above mentioned formula fG x ( (dA x PI) / 180) [= 0,01745 x fG x dA] .</p><p>That is: [USER=319269]@strannik[/USER] (wanderer) finds a factor of about 0,85 for his dishes, so the formula would be, if I understand the google translation correctly:</p><p><strong>distance between LNBs = 0,01745 x fG x dA x 0,85</strong> for straight brackets.</p><p></p><p>However, if I interpret the topic correctly, the formula for a curved bracket would still be (about) 0,01745 x fG x dA; and a curved bracket would give only 3% loss compared to a straight bracket.</p><p></p><p>These are astonishing finds for me. I'm not sure if the value of 0,85 applies to all (normal) dishes, and if my interpretation of the difference in distance-calculation for straight and curved brackets is true.</p><p>I hope I'll discover that in future <img src="https://www.satellites.co.uk/styles/default/xenforo/smilies/smile.png" class="smilie" loading="lazy" alt=":)" title="Smile :)" data-shortname=":)" /> , but thought I would mention these findings here already.</p><p></p><p>greetz,</p><p>A33</p></blockquote><p></p>
[QUOTE="a33, post: 969044, member: 332642"] Coming back to this topic: After finding the following topic on a russian forum, I find that I am partly wrong in my conclusions about multifeed brackets: [URL="https://translate.google.nl/translate?hl=en&sl=ru&u=http://www.sat-expert.com/forum/showthread.php%3Ft%3D20176&prev=search"]Google Translate[/URL] My assumptions about a multifeed bracket best being straight in the horizontal plane, and the aiming of an offset LNB to a "horizontal G-spot" seem to be correct. My assumption about the calculation of LNB-distances for straight brackets seems to be highly incorrect, though. In the above topic it is found that that LNB-distance is a) [B]linear[/B] to the azimuthdifference, and b) [B]smaller[/B] than the above mentioned formula fG x ( (dA x PI) / 180) [= 0,01745 x fG x dA] . That is: [USER=319269]@strannik[/USER] (wanderer) finds a factor of about 0,85 for his dishes, so the formula would be, if I understand the google translation correctly: [B]distance between LNBs = 0,01745 x fG x dA x 0,85[/B] for straight brackets. However, if I interpret the topic correctly, the formula for a curved bracket would still be (about) 0,01745 x fG x dA; and a curved bracket would give only 3% loss compared to a straight bracket. These are astonishing finds for me. I'm not sure if the value of 0,85 applies to all (normal) dishes, and if my interpretation of the difference in distance-calculation for straight and curved brackets is true. I hope I'll discover that in future :) , but thought I would mention these findings here already. greetz, A33 [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Dish Setup Guides, Information threads and FAQs
Multifeed installation and exact calculation of LNB position
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