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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
Astra 2E & 2F: Sidelobes, Nulls and Spots
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<blockquote data-quote="gambit" data-source="post: 859304" data-attributes="member: 304438"><p><span style="font-family: 'Arial'"><strong>Predicted UK Spot</strong></span></p><p></p><p>Here is a predicted UK spot footprint for the 2E /2F sats. The red lines show the 1st, 2nd and 3rd predicted nulls. The side-lobes are between those nulls. I assumed a 2.6m diameter dish.</p><p></p><p style="text-align: center">[ATTACH=full]59014[/ATTACH]</p> <p style="text-align: center"><span style="font-family: 'Arial'">UK Beam Centred on UK</span></p><p></p><p>The map shows that there is a 1st null in NE Spain (Barcelona?) , the 1st side lobe in Valencia and a 2nd null off the coast of SW Spain/Portugal. The 2nd side-lobe is right over the Canaries just north of the Western Sahara. This pattern corresponds broadly with 2F UK spot reception.</p><p></p><p>In reality, the 2E/FUK beams may be slightly tighter than the predicted footprint so that the whole pattern is shrunk closer into the beam centre.</p></blockquote><p></p>
[QUOTE="gambit, post: 859304, member: 304438"] [FONT=Arial][B]Predicted UK Spot[/B][/FONT] Here is a predicted UK spot footprint for the 2E /2F sats. The red lines show the 1st, 2nd and 3rd predicted nulls. The side-lobes are between those nulls. I assumed a 2.6m diameter dish. [CENTER][ATTACH=full]59014[/ATTACH] [FONT=Arial]UK Beam Centred on UK[/FONT][/CENTER] The map shows that there is a 1st null in NE Spain (Barcelona?) , the 1st side lobe in Valencia and a 2nd null off the coast of SW Spain/Portugal. The 2nd side-lobe is right over the Canaries just north of the Western Sahara. This pattern corresponds broadly with 2F UK spot reception. In reality, the 2E/FUK beams may be slightly tighter than the predicted footprint so that the whole pattern is shrunk closer into the beam centre. [/QUOTE]
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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
Astra 2E & 2F: Sidelobes, Nulls and Spots
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