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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
UK spot beam variances in Spain ( and elsewhere )
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<blockquote data-quote="timo_w2s" data-source="post: 972950" data-attributes="member: 196043"><p>The satellites in geostationary orbit are kept there with the help of thrusters that keep the satellite in the right location. They tend to do a little figure of 8 dance over a 24 hour period or so. The exact location of the satellite varies by a few fractions of a degree as it moves back and forth. Normally this isn't an issue for small dishes but ground stations with very large dishes (10m+) need to keep a much more accurate track of the satellite due to beam width of the dish (the bigger the dish the smaller the beamwidth) plus as you go to the very edges of the satellite footprint you will see more obvious variations in signal strength even with smaller dishes as the satellite moves about and goes in and out of the footprint. If you are in the middle of the footprint (like in the UK) you won't see this effect.</p><p></p><p>At least that's how I understand it, but I'm not a rocket scientist so I could be wrong. ;)</p></blockquote><p></p>
[QUOTE="timo_w2s, post: 972950, member: 196043"] The satellites in geostationary orbit are kept there with the help of thrusters that keep the satellite in the right location. They tend to do a little figure of 8 dance over a 24 hour period or so. The exact location of the satellite varies by a few fractions of a degree as it moves back and forth. Normally this isn't an issue for small dishes but ground stations with very large dishes (10m+) need to keep a much more accurate track of the satellite due to beam width of the dish (the bigger the dish the smaller the beamwidth) plus as you go to the very edges of the satellite footprint you will see more obvious variations in signal strength even with smaller dishes as the satellite moves about and goes in and out of the footprint. If you are in the middle of the footprint (like in the UK) you won't see this effect. At least that's how I understand it, but I'm not a rocket scientist so I could be wrong. ;) [/QUOTE]
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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
UK spot beam variances in Spain ( and elsewhere )
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