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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
LNB arm lengths unknown ..?
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<blockquote data-quote="Vipersan" data-source="post: 975626" data-attributes="member: 325666"><p>So ..had a go with the furmula I found online :-</p><p></p><p>Focal length = (width ^ 3) / (16 * depth * height)</p><p></p><p></p><p>In my case (cm) </p><p></p><p>FL = (106^3) / (16 x 9 x 115)</p><p></p><p>FL comes out at approx 72cm ...</p><p>So my LNB arm although working is too long so illumination is starting too far back by about 8cm ...</p><p>this illuminating the wall behind the dish in part ..</p><p></p><p>I will now replace the ally temporarily with a piece of wood cut to 72 cm ...to test ..</p><p>IF the rain ever stops ..</p><p></p><p>The anglular position of the lnb is another question ..but shall use the same angle as the one mtr Orbital as a start point ..</p><p></p><p>This is just by way of experiment to see if I can squeeze a bit more from the dish ..</p><p></p><p>;)</p></blockquote><p></p>
[QUOTE="Vipersan, post: 975626, member: 325666"] So ..had a go with the furmula I found online :- Focal length = (width ^ 3) / (16 * depth * height) In my case (cm) FL = (106^3) / (16 x 9 x 115) FL comes out at approx 72cm ... So my LNB arm although working is too long so illumination is starting too far back by about 8cm ... this illuminating the wall behind the dish in part .. I will now replace the ally temporarily with a piece of wood cut to 72 cm ...to test .. IF the rain ever stops .. The anglular position of the lnb is another question ..but shall use the same angle as the one mtr Orbital as a start point .. This is just by way of experiment to see if I can squeeze a bit more from the dish .. ;) [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
LNB arm lengths unknown ..?
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