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Fringe Reception General
Anyone tried to make BIG dish at home?
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<blockquote data-quote="archive10" data-source="post: 991757"><p>adding to what [USER=312276]@RimaNTSS[/USER] and [USER=239108]@battenfan[/USER] writes, the dishes that are around 35 kg (as my Channel Master 180) are self-carrying fibre-reinforced plastic designs where the structure of the dish keeps and carries the shape even under strong wind-loadings.</p><p>This is the commercially most efficient, as the dishes are cheaper to manufacture and especially ship than alternatives.</p><p></p><p>One of the alternatives is to made a comparatively thin reflector, and get the rigidity and shape by bolting it onto an iron frame.</p><p>There's a thread here <a href="https://www.satellites.co.uk/forums/threads/elevation-help-needed-for-1-8m-offset-dish-malta.163061/#post-902325" target="_blank">Newbie Here - Elevation help needed for 1.8m offset dish (Malta)</a> with pictures of a CM180 clone, which is made by molding resin (I believe it was) over a real CM180, and then fitting this onto a metal frame.</p><p></p><p>If you don't have a CM180 or similar offset dish handy as a mold, I suggest you try and make a prime focus dish instead as discussed above. This make the profile easier to obtain, as it is symmetric around the central axis. You can even make the mold from clay/soil, as demonstrated on certain African websites.</p><p></p><p>If you just want to experiment before you start pouring resin, you can even start out by making a full size test-bed with wooden parts (ribs, centre hub, edge struts), and build a surface on the clay mold using paper mache (glue, water & newspaper) and kitchen foil in a couple of layers as reflector.</p><p>This won't tolerate rain or any kind of wind, but this could get you started with geometry etc.</p></blockquote><p></p>
[QUOTE="archive10, post: 991757"] adding to what [USER=312276]@RimaNTSS[/USER] and [USER=239108]@battenfan[/USER] writes, the dishes that are around 35 kg (as my Channel Master 180) are self-carrying fibre-reinforced plastic designs where the structure of the dish keeps and carries the shape even under strong wind-loadings. This is the commercially most efficient, as the dishes are cheaper to manufacture and especially ship than alternatives. One of the alternatives is to made a comparatively thin reflector, and get the rigidity and shape by bolting it onto an iron frame. There's a thread here [URL="https://www.satellites.co.uk/forums/threads/elevation-help-needed-for-1-8m-offset-dish-malta.163061/#post-902325"]Newbie Here - Elevation help needed for 1.8m offset dish (Malta)[/URL] with pictures of a CM180 clone, which is made by molding resin (I believe it was) over a real CM180, and then fitting this onto a metal frame. If you don't have a CM180 or similar offset dish handy as a mold, I suggest you try and make a prime focus dish instead as discussed above. This make the profile easier to obtain, as it is symmetric around the central axis. You can even make the mold from clay/soil, as demonstrated on certain African websites. If you just want to experiment before you start pouring resin, you can even start out by making a full size test-bed with wooden parts (ribs, centre hub, edge struts), and build a surface on the clay mold using paper mache (glue, water & newspaper) and kitchen foil in a couple of layers as reflector. This won't tolerate rain or any kind of wind, but this could get you started with geometry etc. [/QUOTE]
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Fringe Reception General
Anyone tried to make BIG dish at home?
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