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Satellite TV receivers & systems support forums
Fringe Reception General
Anyone tried to make BIG dish at home?
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<blockquote data-quote="BombedOne" data-source="post: 548223" data-attributes="member: 300998"><p>Thanks everyone for reply. </p><p></p><p>Regarding method I've read in book. It has drawing for making specially cutted out metal plate, which you install on tube, to allow 360 degree rotation over center axis, and you use it to create preform from concrete and (or) clay. Below I tried to reproduce drawing from it:</p><p></p><p>_http://img329.imageshack.us/my.php?image=dishov4.jpg</p><p></p><p>First you make metal plate (The formula I mentioned defines it's shape calculation, and book already contains design for 2m dish plate), then mount it on stable pole. Then build pyramid like construction around of it made from bricks or stones. After that - roughly apply concrete, and start using metal plate to achieve exact form. For finishing touches, modelling clay is recomended. Regarding reflecting layer, it should be made from aluminum foil.</p><p></p><p>The real problem is, book doesn't mentions quantity of fiberglass and epoxy needed even for 2 meter model (trough it says - 5 or 6 layers will be needed). So if it really needs large amount, maybe manufacturing will be expensive, than buying ready one. For test purposes, I bought 0.5kg of epoxy and 1x1m sheet of fiberglass fabric. This weekend I'll try to reproduce small scale (20-30cm) model, just to check manufacturing problem/expenses, I will not target parabolic shape, just will use beach ball as preform.</p><p></p><p>Balancing LNB position won't be a hard task I think. Is it possible to adjust length of each support leg, so I can lock to some powerfull satellite, adjust legs to reach maximum signal, and then turn dish to weaker one.</p></blockquote><p></p>
[QUOTE="BombedOne, post: 548223, member: 300998"] Thanks everyone for reply. Regarding method I've read in book. It has drawing for making specially cutted out metal plate, which you install on tube, to allow 360 degree rotation over center axis, and you use it to create preform from concrete and (or) clay. Below I tried to reproduce drawing from it: _http://img329.imageshack.us/my.php?image=dishov4.jpg First you make metal plate (The formula I mentioned defines it's shape calculation, and book already contains design for 2m dish plate), then mount it on stable pole. Then build pyramid like construction around of it made from bricks or stones. After that - roughly apply concrete, and start using metal plate to achieve exact form. For finishing touches, modelling clay is recomended. Regarding reflecting layer, it should be made from aluminum foil. The real problem is, book doesn't mentions quantity of fiberglass and epoxy needed even for 2 meter model (trough it says - 5 or 6 layers will be needed). So if it really needs large amount, maybe manufacturing will be expensive, than buying ready one. For test purposes, I bought 0.5kg of epoxy and 1x1m sheet of fiberglass fabric. This weekend I'll try to reproduce small scale (20-30cm) model, just to check manufacturing problem/expenses, I will not target parabolic shape, just will use beach ball as preform. Balancing LNB position won't be a hard task I think. Is it possible to adjust length of each support leg, so I can lock to some powerfull satellite, adjust legs to reach maximum signal, and then turn dish to weaker one. [/QUOTE]
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Fringe Reception General
Anyone tried to make BIG dish at home?
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