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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="JanH" data-source="post: 774308" data-attributes="member: 320416"><p>Giant and very interesting project. I can not imagine four 3m dishes on my garden if space enought. It is really fantasy. </p><p></p><p>I think it is about impedances. </p><p>I suggest use feedhorn cated from LNB to convert dish impedance to pipe impedance and use same diameter pipe as LNB have inside. Other side could be append to LNB without feedhorn. </p><p>Four pipes connected together means 4x smaller impedance, which should be converted back. Maybe help some lamda/x pipe (strongly depend on frequency) or some cone piece connected identically to LNB without feedhorn. Pipes must have exactly same length perferably lambda or lambda/2 to have same impedance on input and output.</p><p>There were old fashion feedhorns designed with flange to pipe as well as LNBs.</p><p></p><p>I have no idea if or how subreflector can change impedances. Probably yes.</p><p>JH</p></blockquote><p></p>
[QUOTE="JanH, post: 774308, member: 320416"] Giant and very interesting project. I can not imagine four 3m dishes on my garden if space enought. It is really fantasy. I think it is about impedances. I suggest use feedhorn cated from LNB to convert dish impedance to pipe impedance and use same diameter pipe as LNB have inside. Other side could be append to LNB without feedhorn. Four pipes connected together means 4x smaller impedance, which should be converted back. Maybe help some lamda/x pipe (strongly depend on frequency) or some cone piece connected identically to LNB without feedhorn. Pipes must have exactly same length perferably lambda or lambda/2 to have same impedance on input and output. There were old fashion feedhorns designed with flange to pipe as well as LNBs. I have no idea if or how subreflector can change impedances. Probably yes. JH [/QUOTE]
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Fringe Reception General
Anyone tried to make BIG dish at home?
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