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DISH SETUP: Single sat, Multi-Sat & Motorised
Aluminium Tin foil reflector for Ku band ?
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<blockquote data-quote="HB13DISH" data-source="post: 505544" data-attributes="member: 262829"><p>Went back to basics and looked up the electrical resistivities of several metals just to get a quantitative idea about which metal is best to make a dish.</p><p>The property is called Electrical Resistivity in ohm-m. the smaller the better:</p><p>Aluminum 99.9% 29.000E-9</p><p>Aluminum Alloys 45.000E-9</p><p>Copper 99.9% 17.000E-9</p><p>Brass 62.000E-9</p><p>Silver 18.000E9</p><p>Steel 1020 169.000E-9</p><p>Iron 98.000E-9</p><p>Gold 22.000E-9</p><p></p><p>There is also another property called Conductivity.</p><p></p><p>Anyway, it looks like a good metal to use would be copper with 17.000E-9</p><p>compared to Aluminum with 29.000E-9</p><p>I thought gold was better than copper, but it looks like this is not true.</p><p></p><p>I don't know what type of Aluminum was used in your experiments, but I doubt if they are anything near a pure type.</p><p>If you want to experiment, then your best choice would be a DIY dish made of copper.</p><p>As you have strong satellites in your area, then perhaps a small dish of 45cm made of copper or copper sheets might give you some signal.</p><p>I think that with such a small dish the surface has to be quite smooth all over the dish, without any cuts, so that rules out the petals possibility.</p><p>Enjoy <img src="https://www.satellites.co.uk/styles/default/xenforo/smilies/smile.png" class="smilie" loading="lazy" alt=":)" title="Smile :)" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="HB13DISH, post: 505544, member: 262829"] Went back to basics and looked up the electrical resistivities of several metals just to get a quantitative idea about which metal is best to make a dish. The property is called Electrical Resistivity in ohm-m. the smaller the better: Aluminum 99.9% 29.000E-9 Aluminum Alloys 45.000E-9 Copper 99.9% 17.000E-9 Brass 62.000E-9 Silver 18.000E9 Steel 1020 169.000E-9 Iron 98.000E-9 Gold 22.000E-9 There is also another property called Conductivity. Anyway, it looks like a good metal to use would be copper with 17.000E-9 compared to Aluminum with 29.000E-9 I thought gold was better than copper, but it looks like this is not true. I don't know what type of Aluminum was used in your experiments, but I doubt if they are anything near a pure type. If you want to experiment, then your best choice would be a DIY dish made of copper. As you have strong satellites in your area, then perhaps a small dish of 45cm made of copper or copper sheets might give you some signal. I think that with such a small dish the surface has to be quite smooth all over the dish, without any cuts, so that rules out the petals possibility. Enjoy :) [/QUOTE]
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DISH SETUP: Single sat, Multi-Sat & Motorised
Aluminium Tin foil reflector for Ku band ?
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