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<blockquote data-quote="Old Satellite" data-source="post: 15226" data-attributes="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&nbsp; 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. if there is further interest in this area we can provide further backgound on satellite operationregardsOld satellite</blockquote>

[QUOTE="Old Satellite, post: 15226, 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. if there is further interest in this area we can provide further backgound on satellite operation regards Old satellite [/QUOTE]

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