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DISH SETUP: Single sat, Multi-Sat & Motorised
LNB Skew settings
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<blockquote data-quote="nopfusch" data-source="post: 497119" data-attributes="member: 195487"><p>Hi,</p><p>may I post 2 threads here, regarding one item: LNB skew setting?</p><p></p><p>When I read lungsat or SATCOdx settings, they are for Dishes/LNBs situated in the northern hemisphere.</p><p>And the Skew setting for the LNB? They have none but with digging around I discovered exactly opposing answers.</p><p></p><p>With the aid of the Dish-pointer (great-) program I did the following:</p><p>I took "our" satellite and recorded the following data from the dish-pointer:</p><p>City........................Satellite: Intelsat7/10 .........................City </p><p>Location Longt. ................Location Longt. .................Location Longt.</p><p><strong>Istanbul 28.9° .....................68.5° .......................Hongkong 114.1°</strong></p><p><strong>Latit. 41.04° ......................................................Latit. 22.4°</strong></p><p><strong>LNB skew -<span style="color: red">36.2</span> ...................................................LNB skew 60.0°</strong></p><p>southern hemisphere:</p><p><strong>Germiston South Africa 28.16° .............................Perth 115.8°</strong></p><p><strong>Latit. -26.16° ......................................................Latit. -39.95°</strong></p><p><strong>LNB skew 52.8° ..................................................LNB skew <span style="color: red">-49.7°</span></strong></p><p></p><p><span style="color: #ff0000"><span style="color: black">The difference between Germiston and the Satellite is approx. 40°. So I added to the longitude of Intelsat 7/10 (old PAS 7/10) also 40°. But in the south at this longitude is the Indian Ocean so I went to Perth and in the North is Hongkong, which gives then 50° difference in Longitude between the Satellite and Cities. Not exactly symmetrical to Germiston/Istanbul but for this exercise OK.</span></span></p><p><span style="color: #ff0000"><span style="color: black">Conclusion: the LNB skew depends if the relevant location is before or after the Longitude of the Satellite, when looking from 0°. But with the dish-pointer that problem is now solved.</span></span></p><p></p><p><span style="color: #ff0000"><span style="color: black">In a feed horn of another SATDXer, the "local" Satellite (PAS 7/10) can only be viewed in the extreme skew setting either 0° or plus and minus</span></span></p><p><span style="color: #ff0000"><span style="color: black">90° in C- and Ku-Band. The feed horn is exactly aligned to be in line with the dish pivoting axis (Polar axis) </span></span><span style="color: #ff0000"><span style="color: black">and there is no more possible settings. As the equipment is 2ND hand, it might have been tampered with, although it doesn't look like.</span></span></p><p><span style="color: #ff0000"><span style="color: black">I removed the feed horn and looked into the same. The feed horn has the diverter plate in, to receive circular polarized signals. Now the pick-up probes for the C-Band (which rotate when changing the skew) are just looking past the diverter plate . That could maybe explain the C-Band. But the pick-up probes for the Ku-Band is separated and before the diverter plates. And no matter what I tried, It comes back to this setting 90-0-</span></span></p><p><span style="color: #ff0000"><span style="color: black">90 degrees. </span></span></p><p><span style="color: #ff0000"><span style="color: black">And at the Location here, it should be 52° but for which polarity?</span></span></p><p><span style="color: #ff0000"><span style="color: black">I assume it is in the center of both polarities but then: 52°</span></span></p><p><span style="color: #ff0000"><span style="color: black">+ </span><span style="color: black">45° is out of range (can't be >90°). Where is my or <em>the</em> mistake? <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite53" alt=":confused" title="Confused :confused" loading="lazy" data-shortname=":confused" /></span></span></p><p><span style="color: #ff0000"><span style="color: black">Thanks.</span></span></p><p><span style="color: #ff0000"></span></p><p><span style="color: #ff0000"><span style="color: black">The dish pointer and other prog's overdoing the sizes of dishes to receive that Satellite here: 120 cm! a 40 cm dish delivers good pic's.</span></span></p><p><span style="color: #ff0000"><span style="color: black">And the SATco Receivable program says it needs here a 900 cm (9 meters!) dish to receive the C-Badr. My friend with a 3.2m dish has excellent pic's with a quality of > 75% !</span></span></p><p><span style="color: #ff0000"></span></p></blockquote><p></p>
[QUOTE="nopfusch, post: 497119, member: 195487"] Hi, may I post 2 threads here, regarding one item: LNB skew setting? When I read lungsat or SATCOdx settings, they are for Dishes/LNBs situated in the northern hemisphere. And the Skew setting for the LNB? They have none but with digging around I discovered exactly opposing answers. With the aid of the Dish-pointer (great-) program I did the following: I took "our" satellite and recorded the following data from the dish-pointer: City........................Satellite: Intelsat7/10 .........................City Location Longt. ................Location Longt. .................Location Longt. [B]Istanbul 28.9° .....................68.5° .......................Hongkong 114.1°[/B] [B]Latit. 41.04° ......................................................Latit. 22.4°[/B] [B]LNB skew -[COLOR=red]36.2[/COLOR] ...................................................LNB skew 60.0°[/B] southern hemisphere: [B]Germiston South Africa 28.16° .............................Perth 115.8°[/B] [B]Latit. -26.16° ......................................................Latit. -39.95°[/B] [B]LNB skew 52.8° ..................................................LNB skew [COLOR=red]-49.7°[/COLOR][/B] [COLOR=#ff0000][COLOR=black]The difference between Germiston and the Satellite is approx. 40°. So I added to the longitude of Intelsat 7/10 (old PAS 7/10) also 40°. But in the south at this longitude is the Indian Ocean so I went to Perth and in the North is Hongkong, which gives then 50° difference in Longitude between the Satellite and Cities. Not exactly symmetrical to Germiston/Istanbul but for this exercise OK.[/COLOR][/COLOR] [COLOR=#ff0000][COLOR=black]Conclusion: the LNB skew depends if the relevant location is before or after the Longitude of the Satellite, when looking from 0°. But with the dish-pointer that problem is now solved.[/COLOR][/COLOR] [COLOR=#ff0000][COLOR=black]In a feed horn of another SATDXer, the "local" Satellite (PAS 7/10) can only be viewed in the extreme skew setting either 0° or plus and minus[/COLOR][/COLOR] [COLOR=#ff0000][COLOR=black]90° in C- and Ku-Band. The feed horn is exactly aligned to be in line with the dish pivoting axis (Polar axis) [/COLOR][/COLOR][COLOR=#ff0000][COLOR=black]and there is no more possible settings. As the equipment is 2ND hand, it might have been tampered with, although it doesn't look like.[/COLOR][/COLOR] [COLOR=#ff0000][COLOR=black]I removed the feed horn and looked into the same. The feed horn has the diverter plate in, to receive circular polarized signals. Now the pick-up probes for the C-Band (which rotate when changing the skew) are just looking past the diverter plate . That could maybe explain the C-Band. But the pick-up probes for the Ku-Band is separated and before the diverter plates. And no matter what I tried, It comes back to this setting 90-0-[/COLOR][/COLOR] [COLOR=#ff0000][COLOR=black]90 degrees. [/COLOR][/COLOR] [COLOR=#ff0000][COLOR=black]And at the Location here, it should be 52° but for which polarity?[/COLOR][/COLOR] [COLOR=#ff0000][COLOR=black]I assume it is in the center of both polarities but then: 52°[/COLOR] [COLOR=black]+ [/COLOR][COLOR=black]45° is out of range (can't be >90°). Where is my or [I]the[/I] mistake? :confused:[/COLOR] [COLOR=black]Thanks.[/COLOR] [COLOR=black]The dish pointer and other prog's overdoing the sizes of dishes to receive that Satellite here: 120 cm! a 40 cm dish delivers good pic's.[/COLOR] [COLOR=black]And the SATco Receivable program says it needs here a 900 cm (9 meters!) dish to receive the C-Badr. My friend with a 3.2m dish has excellent pic's with a quality of > 75% ![/COLOR] [/COLOR] [/QUOTE]
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DISH SETUP: Single sat, Multi-Sat & Motorised
LNB Skew settings
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