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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
2a North Beam&2d
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<blockquote data-quote="Old Satellite" data-source="post: 16645" data-attributes="member: 175277"><p>It is normal for satellite footprints to have variations this is due to a large number of reasons including maintaining the position of the satellite by the use of the on board thrusters. (approx every 3-4 weeks) </p><p></p><p>Normally every satellite drifts marginally in its pre defined area in space along the geo stationary orbit- external influences cause the satellite to drift they include gravitational effects, thermal extremities etc. </p><p></p><p>Additional the cycle (approx 4 hours) you identify is most likely a result of the actual power on board the satellite changing marginally due to re-positioning of the solar cells to maintain the satellites aspect to the sun. </p><p>As a consequence the satellite's Transponder TWA (Travelling tube wave amplifiers output will also change marginally this results in a minor change in level of signal within the defined recieving footprints area. </p><p></p><p>When you consider that a majority of TWA are around 100 Watt's it gives you an indication of why only a small change in TWA power results in quite signifcant changes within the recieving area. </p><p></p><p>What type of LNB system are you using a normal Universal ?, and how has the LNB been setup ?- I know from your region that a Patriot 3.8 mtr works fine,what type of mtr dish do you have ? could you provide further detials of your set up and exact location please so that we can try to help further.</p><p></p><p>regards </p><p></p><p>Old satellite</p></blockquote><p></p>
[QUOTE="Old Satellite, post: 16645, member: 175277"] It is normal for satellite footprints to have variations this is due to a large number of reasons including maintaining the position of the satellite by the use of the on board thrusters. (approx every 3-4 weeks) Normally every satellite drifts marginally in its pre defined area in space along the geo stationary orbit- external influences cause the satellite to drift they include gravitational effects, thermal extremities etc. Additional the cycle (approx 4 hours) you identify is most likely a result of the actual power on board the satellite changing marginally due to re-positioning of the solar cells to maintain the satellites aspect to the sun. As a consequence the satellite's Transponder TWA (Travelling tube wave amplifiers output will also change marginally this results in a minor change in level of signal within the defined recieving footprints area. When you consider that a majority of TWA are around 100 Watt's it gives you an indication of why only a small change in TWA power results in quite signifcant changes within the recieving area. What type of LNB system are you using a normal Universal ?, and how has the LNB been setup ?- I know from your region that a Patriot 3.8 mtr works fine,what type of mtr dish do you have ? could you provide further detials of your set up and exact location please so that we can try to help further. regards Old satellite [/QUOTE]
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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
2a North Beam&2d
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