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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
Astra 2F: Central & East Europe Discussion
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<blockquote data-quote="gigiPar" data-source="post: 830521" data-attributes="member: 393752"><p>I know what I am going to say my sound strange.</p><p></p><p>These great variations of signal without apparent explanation got me curious. I starting searching the internet for topics like "satellite signal propagation".</p><p>I found an academic paper titled "Satellite COmmunications at Ku, Ja, and V bands: propagation impairments and mitigation techniques" Athanasios D. Panagoulis, Pantelis-Daniel M. Arapoglou, and Panayotis G. Cottis, National Techical University of Athens, 2004.</p><p>The research, as the title suggests, explores various tecniques exploited by satellite operators to mitigate loss of signal due to bad weather.</p><p></p><p>Amongst the various tecniques explained there is one in the paper which is defined "spot beam shaping". At that time (eight years ago), the researchers say, it was in its first steps, and I have no idea wheter it has later found industrial application. Anyway, the tecnique consists of changing the configuration of the set of the transmitting antennas of the satellite, in order to avoid loss of signal power due to weather conditions.</p><p>For example, when in the Uk, is very cloudy and rainy, Astra could slightly change the pointing of the antennas that send the signal down to earth, in order to keep the desired signal strenght for the uk spot beam even in very unfavourable atmosferic conditions (and so not disappointing the owners of mini dishes..).</p><p>Science fiction or reality? Anyway, it would be interesting to investigate how the weater was in the Uk during the first black out (which lasted almost two days), and the second (wich lasted I thin just a few ours yesterday afternoon).</p></blockquote><p></p>
[QUOTE="gigiPar, post: 830521, member: 393752"] I know what I am going to say my sound strange. These great variations of signal without apparent explanation got me curious. I starting searching the internet for topics like "satellite signal propagation". I found an academic paper titled "Satellite COmmunications at Ku, Ja, and V bands: propagation impairments and mitigation techniques" Athanasios D. Panagoulis, Pantelis-Daniel M. Arapoglou, and Panayotis G. Cottis, National Techical University of Athens, 2004. The research, as the title suggests, explores various tecniques exploited by satellite operators to mitigate loss of signal due to bad weather. Amongst the various tecniques explained there is one in the paper which is defined "spot beam shaping". At that time (eight years ago), the researchers say, it was in its first steps, and I have no idea wheter it has later found industrial application. Anyway, the tecnique consists of changing the configuration of the set of the transmitting antennas of the satellite, in order to avoid loss of signal power due to weather conditions. For example, when in the Uk, is very cloudy and rainy, Astra could slightly change the pointing of the antennas that send the signal down to earth, in order to keep the desired signal strenght for the uk spot beam even in very unfavourable atmosferic conditions (and so not disappointing the owners of mini dishes..). Science fiction or reality? Anyway, it would be interesting to investigate how the weater was in the Uk during the first black out (which lasted almost two days), and the second (wich lasted I thin just a few ours yesterday afternoon). [/QUOTE]
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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
Astra 2F: Central & East Europe Discussion
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