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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: 751446" data-attributes="member: 320416"><p>I understood that six antenas are in plain configuration with deflector in focus point each all pointed to one LNB in the middle of system.</p><p>I am not shure if possible to send signal to LNB using marginal angle like this. Feedhorn is antanna as ordinary one with ordinary pattern. Second problem which make gain losses is that feedhorn can "see" open space in middle direct and main course. It made additional source of noise.</p><p>I think it is possible solution to use further deflector instead LNB and point it to LNB in centre of the system looking down to hub of antennas. Loks a bit complicated and series of deflectors make efficiency of system worse regardless system adjustment problems.</p><p>I am not shure that offset antenas are pure parabolic shape. LNB is not in right position and looks to midle of offset dish. If parabolic it should be pointed to centre of virtual parabole out of offset dish. It is similar but modify.</p></blockquote><p></p>
[QUOTE="JanH, post: 751446, member: 320416"] I understood that six antenas are in plain configuration with deflector in focus point each all pointed to one LNB in the middle of system. I am not shure if possible to send signal to LNB using marginal angle like this. Feedhorn is antanna as ordinary one with ordinary pattern. Second problem which make gain losses is that feedhorn can "see" open space in middle direct and main course. It made additional source of noise. I think it is possible solution to use further deflector instead LNB and point it to LNB in centre of the system looking down to hub of antennas. Loks a bit complicated and series of deflectors make efficiency of system worse regardless system adjustment problems. I am not shure that offset antenas are pure parabolic shape. LNB is not in right position and looks to midle of offset dish. If parabolic it should be pointed to centre of virtual parabole out of offset dish. It is similar but modify. [/QUOTE]
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Fringe Reception General
Anyone tried to make BIG dish at home?
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