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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: 859234" data-attributes="member: 304438"><p>Apologies if this is off topic, although I guess that joddle's point relates to the framework within which the 2E test data for fringe reception are interpreted.</p><p></p><p>I have, perhaps mistakenly, believed that the 'blank spot' over North East Spain (Barcelona) and similar regions of low signal are null points between the side lobes - a feature of all satellite dish transmissions. Is it not correct that Barcelona lies on the first null of the 2F UK spot beam, Valencia on the first side-lobe and then south west Spain on or near the second null?</p><p></p><p>AFAIK the pattern of these side-lobes is determined mainly by the diameter of the transmitting antenna and, given that both the 2E and 2F dishes are the same size, that the side-lobes will be in essentially the same position.</p><p></p><p>I understood that the similar Astra 2D 'blank spot' around Valencia resulted from the first null from the smaller 2D UK spot dish.</p></blockquote><p></p>
[QUOTE="gambit, post: 859234, member: 304438"] Apologies if this is off topic, although I guess that joddle's point relates to the framework within which the 2E test data for fringe reception are interpreted. I have, perhaps mistakenly, believed that the 'blank spot' over North East Spain (Barcelona) and similar regions of low signal are null points between the side lobes - a feature of all satellite dish transmissions. Is it not correct that Barcelona lies on the first null of the 2F UK spot beam, Valencia on the first side-lobe and then south west Spain on or near the second null? AFAIK the pattern of these side-lobes is determined mainly by the diameter of the transmitting antenna and, given that both the 2E and 2F dishes are the same size, that the side-lobes will be in essentially the same position. I understood that the similar Astra 2D 'blank spot' around Valencia resulted from the first null from the smaller 2D UK spot dish. [/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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