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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Inside surface of Feedhorn - Shiny or dull?
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<blockquote data-quote="archive10" data-source="post: 966948"><p>Now, now, gentlemen. <img src="https://www.satellites.co.uk/styles/default/xenforo/smilies/smile.png" class="smilie" loading="lazy" alt=":)" title="Smile :)" data-shortname=":)" /></p><p></p><p>Before we start modifying OPs dish, there's one thing that I noticed:</p><p></p><p></p><p></p><p>From your pictures, I can see no indication of skewing of the Inverto LNB.</p><p></p><p>I understand the following from your posts above:</p><p>- the dish is aimed at 28.2E</p><p>- you are located in Athens, Greece</p><p>- You did the swap of LNBs from Invacom to Inverto yourself</p><p></p><p>In Athens, you need about 2 degrees skew to the left (as seen when standing in front of the dish as in the second picture).</p><p>It makes the LNB look as if it was rotated slightly counterclockwise.</p><p>This does not sound like a lot, but just a single degree can make a noticable difference.</p><p>And it *is* visible when looking at the LNB/dish head-on.</p><p></p><p>When you installed the Inverto, did you just make the LNB vertical, or did you use a meter to maximise C/N ratio of the signal while adjusting skew?</p><p></p><p>I may be wrong, but it looks as if you could (sub-)optimise the reception by adjusting skew properly.</p><p>Note: This is very difficult to do unless you are right next to the LNB, and have either a sat-meter, or a PC with a Satcard or sat-usb-box + necessary software, so that you can fiddle with skew until you get maximum C/N ratio.</p><p></p><p>Edit:</p><p>And you also need to adjust the azimuth and elevation to match several channels (ie. both 28.5E and 28.2E).</p><p>When you have as big a dish as you do, then the beam width of the reflector means that you need to adjust you aim carefully to get the channels you want. Ideally, you need to aim either at 28.5E for SD, or 28.2E for HD, or a compromise 28.35E to get a useful balance...</p><p></p><p>this can all be done without modifying anything.</p><p>But it takes time, and patience, but *is* required for getting reception right...</p></blockquote><p></p>
[QUOTE="archive10, post: 966948"] Now, now, gentlemen. :) Before we start modifying OPs dish, there's one thing that I noticed: From your pictures, I can see no indication of skewing of the Inverto LNB. I understand the following from your posts above: - the dish is aimed at 28.2E - you are located in Athens, Greece - You did the swap of LNBs from Invacom to Inverto yourself In Athens, you need about 2 degrees skew to the left (as seen when standing in front of the dish as in the second picture). It makes the LNB look as if it was rotated slightly counterclockwise. This does not sound like a lot, but just a single degree can make a noticable difference. And it *is* visible when looking at the LNB/dish head-on. When you installed the Inverto, did you just make the LNB vertical, or did you use a meter to maximise C/N ratio of the signal while adjusting skew? I may be wrong, but it looks as if you could (sub-)optimise the reception by adjusting skew properly. Note: This is very difficult to do unless you are right next to the LNB, and have either a sat-meter, or a PC with a Satcard or sat-usb-box + necessary software, so that you can fiddle with skew until you get maximum C/N ratio. Edit: And you also need to adjust the azimuth and elevation to match several channels (ie. both 28.5E and 28.2E). When you have as big a dish as you do, then the beam width of the reflector means that you need to adjust you aim carefully to get the channels you want. Ideally, you need to aim either at 28.5E for SD, or 28.2E for HD, or a compromise 28.35E to get a useful balance... this can all be done without modifying anything. But it takes time, and patience, but *is* required for getting reception right... [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Inside surface of Feedhorn - Shiny or dull?
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