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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Prime focus vs offset big dish
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<blockquote data-quote="7mdish" data-source="post: 1115956" data-attributes="member: 401140"><p>Hello, I'm in the market for a new, professional-grade, 1-piece, 1.8m or 2m dish. I was pretty sure to buy a prime focus dish, but someone suggested to evaluate offset dishes, too. I never used big offset dishes (only less than 1m), so I'm a little bit confused. Offset dish have typical elevation angle shifted of about 20 degrees compared to prime focus, so what about extreme East/West satellites on Clarke belt? It means, when a prime focus dish is at, say, 15 degrees in elevation, an offset dish would be below horizont line! How can it receive the signal? Could I have a shorter "view" using such dish? And what about possible interferences from near satellites? Focus point in PFA antennas is narrow, very little. But it is larger in offset dishes, so what about strong signals from satellites positioned at 2 or 3 degrees at both dish sides? Anyone could clarify to me this points please? Thank you.</p></blockquote><p></p>
[QUOTE="7mdish, post: 1115956, member: 401140"] Hello, I'm in the market for a new, professional-grade, 1-piece, 1.8m or 2m dish. I was pretty sure to buy a prime focus dish, but someone suggested to evaluate offset dishes, too. I never used big offset dishes (only less than 1m), so I'm a little bit confused. Offset dish have typical elevation angle shifted of about 20 degrees compared to prime focus, so what about extreme East/West satellites on Clarke belt? It means, when a prime focus dish is at, say, 15 degrees in elevation, an offset dish would be below horizont line! How can it receive the signal? Could I have a shorter "view" using such dish? And what about possible interferences from near satellites? Focus point in PFA antennas is narrow, very little. But it is larger in offset dishes, so what about strong signals from satellites positioned at 2 or 3 degrees at both dish sides? Anyone could clarify to me this points please? Thank you. [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Prime focus vs offset big dish
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