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Here is the link to a design how to DIY a simple parabolic dish antenna. The design is self-explanatory and easy to understand.
For the fine details, check also the following links:
Just a few hints from my side:
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for amateurs without required instruments and knowledge it is much easier first to choose the feed and according to the feed to construct the dish with F/d that match the feed you intend to use.
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can feed (circular waveguide) are good for deep dish, F/d 0.35-0-45
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use the aluminum flat bars (strips) 2 mm, do not use 1 mm as construction will be not so rigid
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do not use the plastic screening mesh wire for the reflector :-)
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the size of the eye on the chicken mesh wire will set the maximum frequency you can use.
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this approach and antenna design is good up to 3 GHz, do not use it above that frequency
have fun...
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