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Pictures of Members' Setups and general satellite
SMW OA 1600 dish
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<blockquote data-quote="rayhan" data-source="post: 987264" data-attributes="member: 409287"><p>I made a CAD model, got it machined on a CNC router on foam. Then used it as a mold to build a fiberglass dish. Between the layers of fiberglass, I put a layer of aluminium foil (the one used for packing food, available at grocery stores).</p><p>The dish is parabolic width wise and circular length wise. </p><p>I get reception at both the ends of the dish for both the satellites. I haven't tried the middle position but I don't think there is any reason why it won't work. </p><p>Correct me if I'm wrong, but as far as I understand, skewing the dish is done to compensate for the elevation difference between the satellites. </p><p></p><p>Here is what I'm trying to do:</p><p>1. Place one lnb at one side and align it toward 93.5E (GSAT). Once I start getting reception, I tighten the bolts to fix the azimuth of the dish.</p><p>2. Place another lnb at the calculated position for the second satellite. I've found the exact positions using my CAD model. Now, if I change the elevation of the dish, at some point I should start getting reception for the second satellite. However, I'm unable to do so. I've tried moving the lnb with my bare hands too. No reception for the second satellite anywhere.</p><p></p><p>I believe my lnb holding mechanism isn't as accurate as it should be. I'm trying to replicate the smw 1600 lnb holder but that is a time consuming task.</p><p></p><p>On a side note, I found that on a regular paraboloidal offset dish (60 cm), I can compensate for the error in alignment of the elevation of the dish by moving the lnb itself. As an example, consider I have reception at 60 degrees elevation. Now if I intentionally change the elevation to say 70 degrees and move the lnb upwards by 5-10 cm, I'm still able to receive almost the same signal strength. I've tried this with my torus and it works. This made me believe that there isn't a need to skew the torus at all.</p></blockquote><p></p>
[QUOTE="rayhan, post: 987264, member: 409287"] I made a CAD model, got it machined on a CNC router on foam. Then used it as a mold to build a fiberglass dish. Between the layers of fiberglass, I put a layer of aluminium foil (the one used for packing food, available at grocery stores). The dish is parabolic width wise and circular length wise. I get reception at both the ends of the dish for both the satellites. I haven't tried the middle position but I don't think there is any reason why it won't work. Correct me if I'm wrong, but as far as I understand, skewing the dish is done to compensate for the elevation difference between the satellites. Here is what I'm trying to do: 1. Place one lnb at one side and align it toward 93.5E (GSAT). Once I start getting reception, I tighten the bolts to fix the azimuth of the dish. 2. Place another lnb at the calculated position for the second satellite. I've found the exact positions using my CAD model. Now, if I change the elevation of the dish, at some point I should start getting reception for the second satellite. However, I'm unable to do so. I've tried moving the lnb with my bare hands too. No reception for the second satellite anywhere. I believe my lnb holding mechanism isn't as accurate as it should be. I'm trying to replicate the smw 1600 lnb holder but that is a time consuming task. On a side note, I found that on a regular paraboloidal offset dish (60 cm), I can compensate for the error in alignment of the elevation of the dish by moving the lnb itself. As an example, consider I have reception at 60 degrees elevation. Now if I intentionally change the elevation to say 70 degrees and move the lnb upwards by 5-10 cm, I'm still able to receive almost the same signal strength. I've tried this with my torus and it works. This made me believe that there isn't a need to skew the torus at all. [/QUOTE]
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Pictures of Members' Setups and general satellite
SMW OA 1600 dish
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