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DISH SETUP: Single sat, Multi-Sat & Motorised
2.2mtr Elite / Precision resurection... Part 2.
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<blockquote data-quote="moonbase" data-source="post: 1010724" data-attributes="member: 178786"><p>John,</p><p></p><p>Many thanks for the measurements/pictures.</p><p></p><p>The holesaw with arbor were delivered yesterday to cut the wooden plug to hold the laser in the feed barrel and the short length laser is out for delivery today. I think I have all the other tools so its just a matter of getting the time to start the project.</p><p></p><p>Going back to the measurements and the focal point depth inside the feed barrel, it's possible to get a close approximation of this depth for any dish/feed/band using an online triangle calculator, provided you know the feed beamwidth angle and the internal diameter of the feed. The feed beamwidth angle is available via an online calculator that was linked to previously by someone.</p><p></p><p>I have attached a couple of pictures that present the calculation for your Elite 2.2m dish, I took the feed beamwidth angle from the value you posted previously.</p><p></p><p></p><p>Triangle Calculator</p><p><a href="http://www.cleavebooks.co.uk/scol/calrtri.htm" target="_blank">Right-Angled Triangle Calculator</a></p><p></p><p>Feed Beamwidth Angle</p><p><a href="http://www.satellite-calculations.com/Satellite/reflector.htm" target="_blank">Prime Focus Satellite Antenna reflector calculation</a></p><p></p><p></p><p>Using the pictures I have attached as a guide:</p><p>1. For "edge a", use half the internal feed diameter (31.3mm for AV-COMM barrel)</p><p>2. For "angle A", use half the feed beamwidth angle of the dish (72.75 degrees for an Elite 2.2m)</p><p>3. Click the "Calculate It" button</p><p>4. The depth of the focal point inside the feed is listed in the "edge b" box</p><p></p><p>It's only a theoretical result and will not be as accurate as manually tuning the feed. However, it might help get the user into the ball park as a starting point for finer manual tuning. For the Elite 2.2m dish, it calculates the focal point depth at 9.72mm which is a little out from your manually fine tuned value which is to be expected. The manual fine tuning is a real world value that is precise, the calculated value is only theoretical.</p><p></p><p></p><p>Rgds</p></blockquote><p></p>
[QUOTE="moonbase, post: 1010724, member: 178786"] John, Many thanks for the measurements/pictures. The holesaw with arbor were delivered yesterday to cut the wooden plug to hold the laser in the feed barrel and the short length laser is out for delivery today. I think I have all the other tools so its just a matter of getting the time to start the project. Going back to the measurements and the focal point depth inside the feed barrel, it's possible to get a close approximation of this depth for any dish/feed/band using an online triangle calculator, provided you know the feed beamwidth angle and the internal diameter of the feed. The feed beamwidth angle is available via an online calculator that was linked to previously by someone. I have attached a couple of pictures that present the calculation for your Elite 2.2m dish, I took the feed beamwidth angle from the value you posted previously. Triangle Calculator [URL='http://www.cleavebooks.co.uk/scol/calrtri.htm']Right-Angled Triangle Calculator[/URL] Feed Beamwidth Angle [URL='http://www.satellite-calculations.com/Satellite/reflector.htm']Prime Focus Satellite Antenna reflector calculation[/URL] Using the pictures I have attached as a guide: 1. For "edge a", use half the internal feed diameter (31.3mm for AV-COMM barrel) 2. For "angle A", use half the feed beamwidth angle of the dish (72.75 degrees for an Elite 2.2m) 3. Click the "Calculate It" button 4. The depth of the focal point inside the feed is listed in the "edge b" box It's only a theoretical result and will not be as accurate as manually tuning the feed. However, it might help get the user into the ball park as a starting point for finer manual tuning. For the Elite 2.2m dish, it calculates the focal point depth at 9.72mm which is a little out from your manually fine tuned value which is to be expected. The manual fine tuning is a real world value that is precise, the calculated value is only theoretical. Rgds [/QUOTE]
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DISH SETUP: Single sat, Multi-Sat & Motorised
2.2mtr Elite / Precision resurection... Part 2.
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