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DISH SETUP: Single sat, Multi-Sat & Motorised
C-Band Reception, UK and Europe
Sunny Day Musings...
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<blockquote data-quote="Vipersan" data-source="post: 767710" data-attributes="member: 325666"><p>Hi friends ..</p><p>Currently sat in the shade of my 1.8pf ...enjoying the indian summer ;)</p><p>Gawd knows we deserved it ..</p><p></p><p>Idle musings caused me to think about the practicalities of receiving both Linear and Circular polarities on on lnbf 'lump' at the focus of the 1.8 ..</p><p>It occurred to me that this item doesn't exist ..</p><p>Next question is ....why?</p><p>Here is a much simplified drawing of what my musings led to ..</p><p>effectively 2 complete c band lnbs joined in series with a dielectric prate seperating the 2 halves ..the rear lnb responsible for circular depolarization ...the front lnb ...linear..</p><p>Obviously a switch would then be employed to select one or t'other...with the first lnb in the chain retaining its lnbf feed ..</p><p></p><p>My question is simply ...why </p><p>..why has this not been tried before ?</p><p>Can anyone see why this would_not_ work ..</p><p>I'm happy to be shot down in flames ...and am also open to ideas and discussion ..</p><p></p><p>I'm also wondering why ..IF..this was practical ..why has no one produced it commecially ...</p><p>A bit like the Cband/KU combo used in the sates ..</p><p>That one only suitable for BUDs but obvious why ku would suffer ...but since the dual C unit would use a common correct sized waveguide..??</p><p>rgds</p><p>VS</p></blockquote><p></p>
[QUOTE="Vipersan, post: 767710, member: 325666"] Hi friends .. Currently sat in the shade of my 1.8pf ...enjoying the indian summer ;) Gawd knows we deserved it .. Idle musings caused me to think about the practicalities of receiving both Linear and Circular polarities on on lnbf 'lump' at the focus of the 1.8 .. It occurred to me that this item doesn't exist .. Next question is ....why? Here is a much simplified drawing of what my musings led to .. effectively 2 complete c band lnbs joined in series with a dielectric prate seperating the 2 halves ..the rear lnb responsible for circular depolarization ...the front lnb ...linear.. Obviously a switch would then be employed to select one or t'other...with the first lnb in the chain retaining its lnbf feed .. My question is simply ...why ..why has this not been tried before ? Can anyone see why this would_not_ work .. I'm happy to be shot down in flames ...and am also open to ideas and discussion .. I'm also wondering why ..IF..this was practical ..why has no one produced it commecially ... A bit like the Cband/KU combo used in the sates .. That one only suitable for BUDs but obvious why ku would suffer ...but since the dual C unit would use a common correct sized waveguide..?? rgds VS [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
C-Band Reception, UK and Europe
Sunny Day Musings...
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