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Satellite TV receivers & systems support forums
Fringe Reception General
Inverto Black Ultra & 1.8m Prime Focus Dish?
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<blockquote data-quote="archive10" data-source="post: 798919"><p>I think you'll find that this specific question has been answered in post #7. One such thing is Pipino's conversion:</p><p></p><p><a href="http://www.satellites.co.uk/forums/dish-setup-single-sat-multi-sat-motorised-systems/169080-inverto-twin-black-ultra-flange-convertion.html" target="_blank">http://www.satellites.co.uk/forums/dish-setup-single-sat-multi-sat-motorised-systems/169080-inverto-twin-black-ultra-flange-convertion.html</a></p><p></p><p>But please note this is a destructive process, and may not give the results you are looking for. Probably better off ordering a C120 Inverto off the internet.</p><p></p><p>Also note that the Black Ultra will most likely work as-is with your dish, you just won't get full signal strength.</p><p>The reason is that the F/D factor, which expresses the focal depth and beam width generally is higher on an offset dish (about 0.60-0.65) than a PF one (0.30-0.45).</p><p>Which F/D ratio the LNB is made for is determined by the feedhorn design.</p><p>The feedhorn inside the Black Ultra generally supports an F/D of about 0.60 (if I remember correctly).</p><p></p><p>This means that if you point a Black Ultra at a PF dish with an F/D of, say, 0.38, it will only see a smaller part of the reflector surface (probably something like 1/2 to 2/3 of the dish face). In other words it will probably work, but you will not use all of the surface of your reflector.</p><p>This can be a serious source of disappointment if you can't see Astra 1N after having obtained a 1.8m dish for the purpose.</p><p></p><p>This is why you are better off with an LNB with the correct feedhorn than slapping the Black Ultra on it.</p></blockquote><p></p>
[QUOTE="archive10, post: 798919"] I think you'll find that this specific question has been answered in post #7. One such thing is Pipino's conversion: [url]http://www.satellites.co.uk/forums/dish-setup-single-sat-multi-sat-motorised-systems/169080-inverto-twin-black-ultra-flange-convertion.html[/url] But please note this is a destructive process, and may not give the results you are looking for. Probably better off ordering a C120 Inverto off the internet. Also note that the Black Ultra will most likely work as-is with your dish, you just won't get full signal strength. The reason is that the F/D factor, which expresses the focal depth and beam width generally is higher on an offset dish (about 0.60-0.65) than a PF one (0.30-0.45). Which F/D ratio the LNB is made for is determined by the feedhorn design. The feedhorn inside the Black Ultra generally supports an F/D of about 0.60 (if I remember correctly). This means that if you point a Black Ultra at a PF dish with an F/D of, say, 0.38, it will only see a smaller part of the reflector surface (probably something like 1/2 to 2/3 of the dish face). In other words it will probably work, but you will not use all of the surface of your reflector. This can be a serious source of disappointment if you can't see Astra 1N after having obtained a 1.8m dish for the purpose. This is why you are better off with an LNB with the correct feedhorn than slapping the Black Ultra on it. [/QUOTE]
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Fringe Reception General
Inverto Black Ultra & 1.8m Prime Focus Dish?
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