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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
min dish size
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<blockquote data-quote="2old4this" data-source="post: 355013" data-attributes="member: 174998"><p>Sats reside in geosynchronous orbit directly above the equator. If you live on the equator, they appear to lie in an arc which stretches from the eastern horizon, up directly above, and down to the western horizon.</p><p></p><p>When viewed from north or south of the equator, that arc will be lower in the sky, so more of it lies below the horizon. So a smaller arc is visible. The amount of the arc that is visible, and which part of the arc, will determine the sats you can see, and can be calculated from your latitude and longitude. One program which does that is SAA, <a href="http://www.al-soft.com/saa/satinfo.shtml" target="_blank">downloadable here</a>. In fact, that program also allows you to take account of the size and distance of obstacles when calculating which sats you should be able to see (and it assumes a default - so if you have completely clear views don't forget to set the size of those objects to zero!)</p><p></p><p>Of course, as well as your geographic location, other factors can limit your sight:</p><p>- motor stops (the amount of E/W travel varies across motors)</p><p>- dish placement (nearby obstructions - walls, etc.)</p><p>- obscured horizons (intervening trees, buildings...)</p><p>- increasing atmospheric absorption and signal noise as you aim the dish closer to the horizon.</p><p></p><p>And just because you can see a satellite doesn't mean you'll be able to receive a signal from it. It may not have any beams aimed at your location, or its transmissions may be incompatible with your equipment.</p><p></p><p>Just to give you an idea:</p><p>With my dish (1.3m Gregorian) I can pull in sats to about 6 or 7 degrees above the horizon at the limit of the motor travel. At my location in the Netherlands, where I am fortunate enough to have unobstructed views, this gives me sats from about 70e to 60w. For example, I receive strong signals (S.African channels) from PAS7/10 at 68.5e.</p><p></p><p>2old</p></blockquote><p></p>
[QUOTE="2old4this, post: 355013, member: 174998"] Sats reside in geosynchronous orbit directly above the equator. If you live on the equator, they appear to lie in an arc which stretches from the eastern horizon, up directly above, and down to the western horizon. When viewed from north or south of the equator, that arc will be lower in the sky, so more of it lies below the horizon. So a smaller arc is visible. The amount of the arc that is visible, and which part of the arc, will determine the sats you can see, and can be calculated from your latitude and longitude. One program which does that is SAA, [URL="http://www.al-soft.com/saa/satinfo.shtml"]downloadable here[/URL]. In fact, that program also allows you to take account of the size and distance of obstacles when calculating which sats you should be able to see (and it assumes a default - so if you have completely clear views don't forget to set the size of those objects to zero!) Of course, as well as your geographic location, other factors can limit your sight: - motor stops (the amount of E/W travel varies across motors) - dish placement (nearby obstructions - walls, etc.) - obscured horizons (intervening trees, buildings...) - increasing atmospheric absorption and signal noise as you aim the dish closer to the horizon. And just because you can see a satellite doesn't mean you'll be able to receive a signal from it. It may not have any beams aimed at your location, or its transmissions may be incompatible with your equipment. Just to give you an idea: With my dish (1.3m Gregorian) I can pull in sats to about 6 or 7 degrees above the horizon at the limit of the motor travel. At my location in the Netherlands, where I am fortunate enough to have unobstructed views, this gives me sats from about 70e to 60w. For example, I receive strong signals (S.African channels) from PAS7/10 at 68.5e. 2old [/QUOTE]
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DISH SETUP: Single sat, Multi-Sat & Motorised
min dish size
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