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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="casser" data-source="post: 564906" data-attributes="member: 264731"><p>I never worked with Fresnel antennas, but i still find very strange..someday i will buid one and test it;)</p><p></p><p></p><p>About the 1mm accuracy, i dont have any theoricall explanation (this is only a hobby<img src="https://www.satellites.co.uk/styles/default/xenforo/smilies/smile.png" class="smilie" loading="lazy" alt=":)" title="Smile :)" data-shortname=":)" />), but what i learn in the last couple of years:</p><p></p><p>-Conical Horn´s. 1mm wont make any difference, 10mm will increase/lower the gain of the antenna, maybe 0.3dBi?! yes, s-dB/VSWR/sidelobes will change, but again it doesnt change enough fto have very poor performance. </p><p></p><p></p><p>-Reflector antennas, my latest reflector antenna was a 32cm version (65% efficiency) made of aluminum cardboard (material for 1mm accuracy?), aimed to a 54dBW satellite i started with 70% signal (usually my receiver receives signal without freezes at 45/50%)..i spent the last days "molding" the antenna to perform better, the result´s..an extra 6%. If i touch or deform a little the antenna it wont affect that much.</p><p></p><p>I dont have a 30cm commercial antenna to do a comparisation, but the difference of signal between my 32cm version and a commercial one wont be very large (maybe 10%?)...for 60Ghz antennas, the 1mm accuracy will be needed, but in 12Ghz? I only need 1mm accuracy with microstrip/patch antennas (2.4Ghz).</p></blockquote><p></p>
[QUOTE="casser, post: 564906, member: 264731"] I never worked with Fresnel antennas, but i still find very strange..someday i will buid one and test it;) About the 1mm accuracy, i dont have any theoricall explanation (this is only a hobby:)), but what i learn in the last couple of years: -Conical Horn´s. 1mm wont make any difference, 10mm will increase/lower the gain of the antenna, maybe 0.3dBi?! yes, s-dB/VSWR/sidelobes will change, but again it doesnt change enough fto have very poor performance. -Reflector antennas, my latest reflector antenna was a 32cm version (65% efficiency) made of aluminum cardboard (material for 1mm accuracy?), aimed to a 54dBW satellite i started with 70% signal (usually my receiver receives signal without freezes at 45/50%)..i spent the last days "molding" the antenna to perform better, the result´s..an extra 6%. If i touch or deform a little the antenna it wont affect that much. I dont have a 30cm commercial antenna to do a comparisation, but the difference of signal between my 32cm version and a commercial one wont be very large (maybe 10%?)...for 60Ghz antennas, the 1mm accuracy will be needed, but in 12Ghz? I only need 1mm accuracy with microstrip/patch antennas (2.4Ghz). [/QUOTE]
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Fringe Reception General
Anyone tried to make BIG dish at home?
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