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Sky Digital BSkyB, Freesat & Saorsat support forum
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Signal levels of Sky in Spain
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<blockquote data-quote="Channel Hopper" data-source="post: 10923" data-attributes="member: 175144"><p>The satellite provider would be ensuring that the steerable antennas on the satellite were pointing at the centre location of the footprint to the best of their ability, which lowers the chances of it being satellite movement within the limitations of the orbital position.</p><p></p><p>Each satellite has a tracking beacon with fixed frequency, and the ground station has (usually) upwards of eight metre antennas for telemetry purposes, the changes on position from an engineer at the site is quite easy to notice, usually to a movement of under 2kms. </p><p></p><p>The provider is also fighting to save fuel on the satellite and just like knocking a meteor off a collision with Earth, its better to deflect it sooner, with less fuel, rather than later. The telemetry algorithms will be programmed with the most economical thruster programme to ensure the longevity of the satellite is maintained.</p><p></p><p>One thing I had not considered however would be the distance of the satellite to the Earth which may also change by a number of kilometers before being detected, (the telemetry station having to use doppler shift of signal to measure this if there is only one station doing the observations). With a fixed focal point antenna on board it would be feasible to assume the actual footprint of the satellite increases and decreases in size with this movement, and so any reception on a fringe area </p><p>fringe areas have signal variations on a daily (or twice daily) basis.</p><p></p><p>I will have to look at the angles of dangle to see if this variation of height affects the fringe areas to a degree enough to be noticed by us amateurs. Thanks to Polomints hypothesis I have another late night using beermat technology, globe and protractor to look forward to.</p></blockquote><p></p>
[QUOTE="Channel Hopper, post: 10923, member: 175144"] The satellite provider would be ensuring that the steerable antennas on the satellite were pointing at the centre location of the footprint to the best of their ability, which lowers the chances of it being satellite movement within the limitations of the orbital position. Each satellite has a tracking beacon with fixed frequency, and the ground station has (usually) upwards of eight metre antennas for telemetry purposes, the changes on position from an engineer at the site is quite easy to notice, usually to a movement of under 2kms. The provider is also fighting to save fuel on the satellite and just like knocking a meteor off a collision with Earth, its better to deflect it sooner, with less fuel, rather than later. The telemetry algorithms will be programmed with the most economical thruster programme to ensure the longevity of the satellite is maintained. One thing I had not considered however would be the distance of the satellite to the Earth which may also change by a number of kilometers before being detected, (the telemetry station having to use doppler shift of signal to measure this if there is only one station doing the observations). With a fixed focal point antenna on board it would be feasible to assume the actual footprint of the satellite increases and decreases in size with this movement, and so any reception on a fringe area fringe areas have signal variations on a daily (or twice daily) basis. I will have to look at the angles of dangle to see if this variation of height affects the fringe areas to a degree enough to be noticed by us amateurs. Thanks to Polomints hypothesis I have another late night using beermat technology, globe and protractor to look forward to. [/QUOTE]
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Sky Digital BSkyB, Freesat & Saorsat support forum
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Signal levels of Sky in Spain
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