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DISH SETUP: Single sat, Multi-Sat & Motorised
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Calculation of the focal length of an offset satellite dish antenna, Revisited
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<blockquote data-quote="scottgs" data-source="post: 1151686" data-attributes="member: 419001"><p>Please excuse me for dredging up an old thread, but I'm a new member here and I'm desperately trying to find the offset angle and focal distance of a new-to-me high-quality dish, and this thread seems to be right on target. </p><p></p><p>This is a non-flat offset feed dish. It came without the feed assembly, arm, etc., and so I have no idea what the offset and focal length are. </p><p></p><p>I see that there are photos of an excel calculator, but I cannot seem to find an actual excel file in this thread. So I'm wondering, am I just missing it, or perhaps if I put my data here, someone on the forum might be able to plug it in and tell me the results? I realize that I can work from the excellent .pdf explanation and formulas presented, but I would have more confidence from a tried and proven spreadsheet, I believe. </p><p></p><p>Here is the relevant data, if someone is willing to help me solve this mystery:</p><p></p><p>a. distance DE, height of the dish, from rim to rim (called 'Hh' further on): </p><p>1260 mm</p><p>b. distance CA, depth of the dish at the center, relative to the height measure ('dh' further on):</p><p>84 mm</p><p>c. distance FG, width of the dish, from rim to rim, measured above the center ('Ww' further on):</p><p>1268 mm</p><p>d. distance CB, depth of the dish at the center, relative to the width measure ('dw' further on):</p><p>95 mm</p><p></p><p>Additionally, there is a marker near the dish center, which I assume might be the aim point for the LNB, but I'm not sure. it is 584 mm from the bottom edge of the dish, along the line Hh, and the depth at this point is 85mm</p><p></p><p>Any help would be much appreciated. </p><p></p><p>Garret W8BUG</p></blockquote><p></p>
[QUOTE="scottgs, post: 1151686, member: 419001"] Please excuse me for dredging up an old thread, but I'm a new member here and I'm desperately trying to find the offset angle and focal distance of a new-to-me high-quality dish, and this thread seems to be right on target. This is a non-flat offset feed dish. It came without the feed assembly, arm, etc., and so I have no idea what the offset and focal length are. I see that there are photos of an excel calculator, but I cannot seem to find an actual excel file in this thread. So I'm wondering, am I just missing it, or perhaps if I put my data here, someone on the forum might be able to plug it in and tell me the results? I realize that I can work from the excellent .pdf explanation and formulas presented, but I would have more confidence from a tried and proven spreadsheet, I believe. Here is the relevant data, if someone is willing to help me solve this mystery: a. distance DE, height of the dish, from rim to rim (called 'Hh' further on): 1260 mm b. distance CA, depth of the dish at the center, relative to the height measure ('dh' further on): 84 mm c. distance FG, width of the dish, from rim to rim, measured above the center ('Ww' further on): 1268 mm d. distance CB, depth of the dish at the center, relative to the width measure ('dw' further on): 95 mm Additionally, there is a marker near the dish center, which I assume might be the aim point for the LNB, but I'm not sure. it is 584 mm from the bottom edge of the dish, along the line Hh, and the depth at this point is 85mm Any help would be much appreciated. Garret W8BUG [/QUOTE]
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DISH SETUP: Single sat, Multi-Sat & Motorised
Dish Setup Guides, Information threads and FAQs
Calculation of the focal length of an offset satellite dish antenna, Revisited
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