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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="cazhh" data-source="post: 859482" data-attributes="member: 391121"><p>There are pretty consistent reports from north jutland, the hamburg area, the braunschweig area, down to east of munich which suggest that there is a huge null line. And reports i've heard from the south of france fit into this assumption as well.</p><p>The issue with most maps is that people don't add at which time they've done their measurements. The signal level in the "border" area which is about 100km wide isn't constant. It varies up to 6SNR db every day. So if someone measures at noon and someone else does the same in the evening you will get completely different results which invalidates all maps i've seen so far.</p><p>There is a beam map on another site which you've probably seen. <a href="http://robssatellitetv.webs.com/rob%20astra%202f%20special%20beam%20uk%2090%20-%2056.JPG" target="_blank">http://robssatellitetv.webs.com/rob astra 2f special beam uk 90 - 56.JPG</a></p><p>Although it looks weird i'm convinced that it is legit. The projection of the map is the same that you get when you look from the position of the satellite to the earth. I've done the excercize to use google earth and add the fieldlines on top of it:</p><p><a href="http://abload.de/image.php?img=image5925f2z1w.jpg" target="_blank"><img src="http://abload.de/thumb/image5925f2z1w.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p>It's the only position and viewangle which matches the reports at least from the eastern side of the beam.</p></blockquote><p></p>
[QUOTE="cazhh, post: 859482, member: 391121"] There are pretty consistent reports from north jutland, the hamburg area, the braunschweig area, down to east of munich which suggest that there is a huge null line. And reports i've heard from the south of france fit into this assumption as well. The issue with most maps is that people don't add at which time they've done their measurements. The signal level in the "border" area which is about 100km wide isn't constant. It varies up to 6SNR db every day. So if someone measures at noon and someone else does the same in the evening you will get completely different results which invalidates all maps i've seen so far. There is a beam map on another site which you've probably seen. [URL='http://robssatellitetv.webs.com/rob%20astra%202f%20special%20beam%20uk%2090%20-%2056.JPG']http://robssatellitetv.webs.com/rob astra 2f special beam uk 90 - 56.JPG[/URL] Although it looks weird i'm convinced that it is legit. The projection of the map is the same that you get when you look from the position of the satellite to the earth. I've done the excercize to use google earth and add the fieldlines on top of it: [URL='http://abload.de/image.php?img=image5925f2z1w.jpg'][IMG]http://abload.de/thumb/image5925f2z1w.jpg[/IMG][/URL] It's the only position and viewangle which matches the reports at least from the eastern side of the beam. [/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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