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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
Astra 1N, Eastern Europe, reception survey, UK spot beam (11126V DVB-S2)
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<blockquote data-quote="Huevos" data-source="post: 778447" data-attributes="member: 301161"><p>I wrote a bit of software to speed things up, but it is pretty simple really, just trigonometry. From point 'A' (centre of the spot beam, in this case Birmingham, 52.50N, 1.90W) work out the distance to the satellite (39178 km). From point 'B' (in this case Krosno, Poland, 49.67N, 21.75E) work out the distance to the satellite (37589 km). Now work out the distance between point 'A' and point 'B'. Note: this is the direct distance which goes below the horizon (2207 km), not the great circle distance (2219 km). Now you have the lengths of 3 sides of a triangle (39178, 37589, 2207) all you have to do is some simple maths to work out the acute angle (<strong><span style="color: #FF0000">2.3º</span></strong>).</p></blockquote><p></p>
[QUOTE="Huevos, post: 778447, member: 301161"] I wrote a bit of software to speed things up, but it is pretty simple really, just trigonometry. From point 'A' (centre of the spot beam, in this case Birmingham, 52.50N, 1.90W) work out the distance to the satellite (39178 km). From point 'B' (in this case Krosno, Poland, 49.67N, 21.75E) work out the distance to the satellite (37589 km). Now work out the distance between point 'A' and point 'B'. Note: this is the direct distance which goes below the horizon (2207 km), not the great circle distance (2219 km). Now you have the lengths of 3 sides of a triangle (39178, 37589, 2207) all you have to do is some simple maths to work out the acute angle ([B][COLOR="#FF0000"]2.3º[/COLOR][/B]). [/QUOTE]
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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
Astra 1N, Eastern Europe, reception survey, UK spot beam (11126V DVB-S2)
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