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Satellite Systems - What to Buy - What to install
Norsat 4108CF Ku band LNB
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<blockquote data-quote="moonbase" data-source="post: 943556" data-attributes="member: 178786"><p>Martin,</p><p></p><p>I don't know is the honest answer, I have never used a prime focus dish with an LNB offset from the centre. I think that there are a few forum members who have a prime focus dish with an LNB offset from the centre point.</p><p></p><p>As it is going to be used for C band, the scalar ring assembly is quite wide. If you have one LNB at its correct position and the centre focus point, the other C band LNB is going to be pushed out a fair bit from the centre in order to accommodate the two scalar ring assemblies. You would be getting the offset LNB illuminated with a signal from a satellite a good few degrees away from where the dish was actually pointing.</p><p></p><p>As you plan to use it for motorised reception on an arc, the dish may need a lot of "peaking" to maximise the signal from the offset LNB? Your centre focus LNB would be correctly sighted to a satellite at its correct arc point. The offset LNB if gathering signal from a satellite 5 degrees away would be aiming too high or too low depending on where you were on the arc. If you have a dual axis system on the dish then you could "peak" easily, even if quite regular.</p></blockquote><p></p>
[QUOTE="moonbase, post: 943556, member: 178786"] Martin, I don't know is the honest answer, I have never used a prime focus dish with an LNB offset from the centre. I think that there are a few forum members who have a prime focus dish with an LNB offset from the centre point. As it is going to be used for C band, the scalar ring assembly is quite wide. If you have one LNB at its correct position and the centre focus point, the other C band LNB is going to be pushed out a fair bit from the centre in order to accommodate the two scalar ring assemblies. You would be getting the offset LNB illuminated with a signal from a satellite a good few degrees away from where the dish was actually pointing. As you plan to use it for motorised reception on an arc, the dish may need a lot of "peaking" to maximise the signal from the offset LNB? Your centre focus LNB would be correctly sighted to a satellite at its correct arc point. The offset LNB if gathering signal from a satellite 5 degrees away would be aiming too high or too low depending on where you were on the arc. If you have a dual axis system on the dish then you could "peak" easily, even if quite regular. [/QUOTE]
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Satellite Systems - What to Buy - What to install
Norsat 4108CF Ku band LNB
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