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Satellite TV receivers & systems support forums
Fringe Reception General
Made a start on my petal extensions ..
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<blockquote data-quote="Huevos" data-source="post: 801445" data-attributes="member: 301161"><p>VS, your focal length is not going to change by adding panels, only you f/d. If you have redone the maths and it appears the focal length has changed that means your panels have not followed the parabolic curve. As a ballpark figure you want to get the edge of your dish within 1/10th of a wavelength or better of where it should be if you want any hope of this working. 1 wavelength at 3GHz is 10cm so you want to aim to get the dish perimeter within 10mm of where it should be, and even better for performance to be good at higher frequencies (4.2 GHz).</p></blockquote><p></p>
[QUOTE="Huevos, post: 801445, member: 301161"] VS, your focal length is not going to change by adding panels, only you f/d. If you have redone the maths and it appears the focal length has changed that means your panels have not followed the parabolic curve. As a ballpark figure you want to get the edge of your dish within 1/10th of a wavelength or better of where it should be if you want any hope of this working. 1 wavelength at 3GHz is 10cm so you want to aim to get the dish perimeter within 10mm of where it should be, and even better for performance to be good at higher frequencies (4.2 GHz). [/QUOTE]
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Satellite TV receivers & systems support forums
Fringe Reception General
Made a start on my petal extensions ..
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