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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
Costa Blanca, 2E/2F, seasonal signal fluctuation.
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<blockquote data-quote="Terryl" data-source="post: 889234" data-attributes="member: 369937"><p>As the Earth turns, the satellites follow, as they go between the Earth and the Sun they get a bit of a tug out towards the Sun, as they get back to 90 degrees to the Earth Sun alignment they get a bit of a tug back towards the Earth, when the Earth is between them and the Sun the get another tug, but this time a bit more towards the Earth, the gyroscope stabilizers on board the satellites put them back at the proper distance.</p><p></p><p>When they get the tug away from the Earth the signals will drop, and then go back up, look at your graph, watch the timing on these highs and lows in the signals, for the Asta 2E I see a dip at 07:00, and one at 19:00, this could be due to the Sun Earth Moon effect, all this is part of the wobble you see in the signals, also the satellite is solar powered, when in the dark side of their orbit they are on battery power, when the come around to the sunny side the solar panels will have been tracked to maximize the charge to the on-board battery's.</p><p></p><p>This movement of the solar panels also causes a wobble, now on some of the older satellites the battery packs may be getting a bit weak, so during the night time the power levels on some of the transponders may drop a bit, this is all determined by how old the bird is and if any of the cells in the solar panels may have sustained any debris (there is a ton of junk up there) or micro meteor damage, or if any of the battery's cells have gone south for the winter.</p><p></p><p>The "Lobes" you may be talking about maybe imperfections in the antennas, these things are not perfect, all transmit antennas have side lobes, and some develop over time, again this due to any debris or micro meteors..</p><p></p><p>It also could be my fault, this due to cleaning the windshields and checking the air in the tires.</p></blockquote><p></p>
[QUOTE="Terryl, post: 889234, member: 369937"] As the Earth turns, the satellites follow, as they go between the Earth and the Sun they get a bit of a tug out towards the Sun, as they get back to 90 degrees to the Earth Sun alignment they get a bit of a tug back towards the Earth, when the Earth is between them and the Sun the get another tug, but this time a bit more towards the Earth, the gyroscope stabilizers on board the satellites put them back at the proper distance. When they get the tug away from the Earth the signals will drop, and then go back up, look at your graph, watch the timing on these highs and lows in the signals, for the Asta 2E I see a dip at 07:00, and one at 19:00, this could be due to the Sun Earth Moon effect, all this is part of the wobble you see in the signals, also the satellite is solar powered, when in the dark side of their orbit they are on battery power, when the come around to the sunny side the solar panels will have been tracked to maximize the charge to the on-board battery's. This movement of the solar panels also causes a wobble, now on some of the older satellites the battery packs may be getting a bit weak, so during the night time the power levels on some of the transponders may drop a bit, this is all determined by how old the bird is and if any of the cells in the solar panels may have sustained any debris (there is a ton of junk up there) or micro meteor damage, or if any of the battery's cells have gone south for the winter. The "Lobes" you may be talking about maybe imperfections in the antennas, these things are not perfect, all transmit antennas have side lobes, and some develop over time, again this due to any debris or micro meteors.. It also could be my fault, this due to cleaning the windshields and checking the air in the tires. [/QUOTE]
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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
Costa Blanca, 2E/2F, seasonal signal fluctuation.
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