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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Av-Comm C Band Waveguide Polariser and a Zinwell Dual Polarity C Band LNBF,
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<blockquote data-quote="moonbase" data-source="post: 1117848" data-attributes="member: 178786"><p>Spiff,</p><p></p><p>To give you an idea of how the signal levels can vary with feed distance from the dish and scalar position I have attached a table below.</p><p>The table was compiled some time ago from 40.5W so the signal levels and frequencies nowadays might have changed, however, the table illustrates the logic.</p><p></p><p></p><p>Table Notes:</p><p>1. Precision 2.0m dish with focal length of 755mm was used.</p><p>2. Scalar positioned at eight different locations along the polo pipe.</p><p>3. Feed positioned at three different distances from the dish at 745mm, 750mm and 755mm</p><p></p><p>As you can see, the signal levels varied, possibly due to the polo pipe introducing some artefacts.</p><p>From my tests, I concluded that the feed and scalar position can be frequency specific, the optimum parameters for one frequency do not always apply globally to all frequencies on a satellite</p><p></p><p>I think there is a similar table from me for another satellite somewhere in the C-Band section of the forum which ilustrates a similar trend.</p><p></p><p>.</p><p>[ATTACH=full]138402[/ATTACH]</p></blockquote><p></p>
[QUOTE="moonbase, post: 1117848, member: 178786"] Spiff, To give you an idea of how the signal levels can vary with feed distance from the dish and scalar position I have attached a table below. The table was compiled some time ago from 40.5W so the signal levels and frequencies nowadays might have changed, however, the table illustrates the logic. Table Notes: 1. Precision 2.0m dish with focal length of 755mm was used. 2. Scalar positioned at eight different locations along the polo pipe. 3. Feed positioned at three different distances from the dish at 745mm, 750mm and 755mm As you can see, the signal levels varied, possibly due to the polo pipe introducing some artefacts. From my tests, I concluded that the feed and scalar position can be frequency specific, the optimum parameters for one frequency do not always apply globally to all frequencies on a satellite I think there is a similar table from me for another satellite somewhere in the C-Band section of the forum which ilustrates a similar trend. . [ATTACH type="full" alt="Feed-Scalar Pairs - 40.5W.jpg"]138402[/ATTACH] [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Av-Comm C Band Waveguide Polariser and a Zinwell Dual Polarity C Band LNBF,
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