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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Inverto black ultra feedhorn .. F/d ??
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<blockquote data-quote="a33" data-source="post: 1064372" data-attributes="member: 332642"><p>the 17.5 depth dish has LNB viewing angle 85 degrees (focal distance 115.7);</p><p>the 18.7 depth dish has LNB viewing angle 90 degrees (focal distance 108.3).</p><p></p><p>So assuming the black ultra has a viewing angle of about 70 degrees (for "standard" offset dishes), you'd use more dish surface of the 17.5 depth dish than of the other one.</p><p>(<strong>I'm assuming the angles should ideally match 1:1 ? I am no expert on LNB feedhorns I'm afraid</strong>. So I'm open to feedback of other forum members on this point.)</p><p></p><p>An LNB with adjustable feedhorn is not an option for you? Because with a 70 degree feedhorn you'd only effectively use a diameter of about 150cm of your 180cm dish I guess, though with less spillover losses than with a real 150cm dish.</p><p></p><p>greetz,</p><p>A33</p></blockquote><p></p>
[QUOTE="a33, post: 1064372, member: 332642"] the 17.5 depth dish has LNB viewing angle 85 degrees (focal distance 115.7); the 18.7 depth dish has LNB viewing angle 90 degrees (focal distance 108.3). So assuming the black ultra has a viewing angle of about 70 degrees (for "standard" offset dishes), you'd use more dish surface of the 17.5 depth dish than of the other one. ([B]I'm assuming the angles should ideally match 1:1 ? I am no expert on LNB feedhorns I'm afraid[/B]. So I'm open to feedback of other forum members on this point.) An LNB with adjustable feedhorn is not an option for you? Because with a 70 degree feedhorn you'd only effectively use a diameter of about 150cm of your 180cm dish I guess, though with less spillover losses than with a real 150cm dish. greetz, A33 [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Inverto black ultra feedhorn .. F/d ??
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