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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Circular Offset Dish?
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<blockquote data-quote="a33" data-source="post: 1134155" data-attributes="member: 332642"><p>The 127 is the <em>effective</em> parabolic height (so without the rim)?</p><p>The 140 and 60 are really such nice rounded figures?</p><p>(Measurement inaccuracies can have much effect on the outcome!)</p><p></p><p>Then here are the results (feedhorn beamwidth would be 65 degrees, cel O-25):</p><p></p><p>[ATTACH=full]144472[/ATTACH]</p><p></p><p></p><p>NB Offset angle of many offset dishes is between 22 and 26 degrees. So <em>39</em> degrees is really high.</p><p><em>Edit: Also the vertical distance between vertex and bottom of dish (y-null) is 37 cm, so far more than 0. That is huge! </em></p><p> </p><p>So I hope your measurements were accurate, and the focal point of the dish really is where you think it is.</p><p>(That is why I prefer to calculate the dish specs from the DISH measurements: These measures are always real (unless the dish is warped), whereas the calculation done from the feedhorn position depends on the correctness of that position....)</p><p></p><p></p><p>Greetz,</p><p>A33</p><p></p><p><em>Edited</em></p></blockquote><p></p>
[QUOTE="a33, post: 1134155, member: 332642"] The 127 is the [I]effective[/I] parabolic height (so without the rim)? The 140 and 60 are really such nice rounded figures? (Measurement inaccuracies can have much effect on the outcome!) Then here are the results (feedhorn beamwidth would be 65 degrees, cel O-25): [ATTACH type="full" alt="Dish specs unk266 12aug2022 2022-08-12 14-46-15.png"]144472[/ATTACH] NB Offset angle of many offset dishes is between 22 and 26 degrees. So [I]39[/I] degrees is really high. [I]Edit: Also the vertical distance between vertex and bottom of dish (y-null) is 37 cm, so far more than 0. That is huge! [/I] So I hope your measurements were accurate, and the focal point of the dish really is where you think it is. (That is why I prefer to calculate the dish specs from the DISH measurements: These measures are always real (unless the dish is warped), whereas the calculation done from the feedhorn position depends on the correctness of that position....) Greetz, A33 [I]Edited[/I] [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Circular Offset Dish?
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