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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Traditional vs Modified Elevation/Declination Angles
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<blockquote data-quote="Huevos" data-source="post: 653717" data-attributes="member: 301161"><p>Declination and this tracking error are two different things. Imagine this: draw a perfect circle on the floor 10 metres in diameter. The circle on the floor is the geostationary orbit. Stand dead centre of the orbit. Now your feet are dead centre but your head is not, it's at 51º latitude. Because of this your eyes need to look downwards to be looking at the orbital circle. This is declination.</p><p></p><p>The tracking error is something different. Step forward a couple of paces to allow for you being at the planet's surface rather than the orbital centre. Now the satellites in front of you are closer to you than the ones at either side so you need to look downwards at a steeper angle to be looking at these satellites. To compensate for this the motor axis needs to lean forward in relation to the earth's axis.</p></blockquote><p></p>
[QUOTE="Huevos, post: 653717, member: 301161"] Declination and this tracking error are two different things. Imagine this: draw a perfect circle on the floor 10 metres in diameter. The circle on the floor is the geostationary orbit. Stand dead centre of the orbit. Now your feet are dead centre but your head is not, it's at 51º latitude. Because of this your eyes need to look downwards to be looking at the orbital circle. This is declination. The tracking error is something different. Step forward a couple of paces to allow for you being at the planet's surface rather than the orbital centre. Now the satellites in front of you are closer to you than the ones at either side so you need to look downwards at a steeper angle to be looking at these satellites. To compensate for this the motor axis needs to lean forward in relation to the earth's axis. [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Traditional vs Modified Elevation/Declination Angles
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