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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Upside down offset dish
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<blockquote data-quote="a33" data-source="post: 1116616" data-attributes="member: 332642"><p>So for a bit of terminology:</p><p>A (correctly mounted) <strong>dish</strong> is always pointing towards (the elevation angle of) the satellite. That is called the boresight, or boresight angle. It is along the symmetry axis of the parabolic form of the (offset or prime focus) dish.</p><p></p><p>The (flat) <strong>dish face</strong> of a <strong>PF dish</strong> is exactly perpendicular to that boresight angle.</p><p></p><p>The (flat) <strong>dish face</strong> of an <strong>offset dish</strong> differs exactly the offset angle to that 'perpendicular to the boresight angle' plane.</p><p></p><p>So the offset dish itself is still <strong>pointed</strong> towards the satellite, but the <strong>dish face is pointed</strong> lower (or higher, when you mount it upside down).</p><p></p><p></p><p>BTW. When the LNB is not mounted at the correct offset angle, you get suboptimal reception by the parabola, as then the offset angle of the LNB location doesn't match with the offset angle of the dish. To get reception, the dish then needs to be set at an angle that doesn't match the boresight; hence the suboptimal reception.</p><p></p><p></p><p>Greetz,</p><p>A33</p></blockquote><p></p>
[QUOTE="a33, post: 1116616, member: 332642"] So for a bit of terminology: A (correctly mounted) [B]dish[/B] is always pointing towards (the elevation angle of) the satellite. That is called the boresight, or boresight angle. It is along the symmetry axis of the parabolic form of the (offset or prime focus) dish. The (flat) [B]dish face[/B] of a [B]PF dish[/B] is exactly perpendicular to that boresight angle. The (flat) [B]dish face[/B] of an [B]offset dish[/B] differs exactly the offset angle to that 'perpendicular to the boresight angle' plane. So the offset dish itself is still [B]pointed[/B] towards the satellite, but the [B]dish face is pointed[/B] lower (or higher, when you mount it upside down). BTW. When the LNB is not mounted at the correct offset angle, you get suboptimal reception by the parabola, as then the offset angle of the LNB location doesn't match with the offset angle of the dish. To get reception, the dish then needs to be set at an angle that doesn't match the boresight; hence the suboptimal reception. Greetz, A33 [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Upside down offset dish
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