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Satellite TV receivers & systems support forums
Fringe Reception General
Anyone know about ISS dishes
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<blockquote data-quote="guest poster" data-source="post: 507383" data-attributes="member: 262401"><p>Many thanks for that info and thread... the overall area is about the same as an 85cm round dish- 77+((91+98/2)/2) less the corner bits = 85-ish. Then the lnb sees right to the points and the gaps so their is a gain but also increased noise. The square shape may have known advantages but far more likely is the dish curve is well engineered.</p><p></p><p>I think the steel Triax are a bit lumpy and not as uniform as I'd expect and the ISS looked far truer if flimsy- the triax steel dishes won't flex in wind - the iss will- the penta won't and I asume are a truer curve than the triax so overall it's probably a good comprimise and the ali ones aren't that much dearer and probably save on trashed diseqc motors.</p><p></p><p>still like to see a comparison with a 1m dish on a weak sat and noise levels- they quote 39db gain at lower freqs in ku band about the same as a 1m but no higher ku freq figure to reflect near 40.5db.</p></blockquote><p></p>
[QUOTE="guest poster, post: 507383, member: 262401"] Many thanks for that info and thread... the overall area is about the same as an 85cm round dish- 77+((91+98/2)/2) less the corner bits = 85-ish. Then the lnb sees right to the points and the gaps so their is a gain but also increased noise. The square shape may have known advantages but far more likely is the dish curve is well engineered. I think the steel Triax are a bit lumpy and not as uniform as I'd expect and the ISS looked far truer if flimsy- the triax steel dishes won't flex in wind - the iss will- the penta won't and I asume are a truer curve than the triax so overall it's probably a good comprimise and the ali ones aren't that much dearer and probably save on trashed diseqc motors. still like to see a comparison with a 1m dish on a weak sat and noise levels- they quote 39db gain at lower freqs in ku band about the same as a 1m but no higher ku freq figure to reflect near 40.5db. [/QUOTE]
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Fringe Reception General
Anyone know about ISS dishes
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