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Satellite TV receivers & systems support forums
Satellite Systems - What to Buy - What to install
I Will Be Reckless.
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<blockquote data-quote="Channel Hopper" data-source="post: 1035445" data-attributes="member: 175144"><p>The advantage of gregorian/cassegrain designs is the improved cross polarisation isolation, so for receive/transmit application it does have an advantage (caveat co-pol systems).</p><p></p><p>The longer path to the feed from the primary reflector can also give a higher rejection from adjacent satellite and background noise since the feed is looking at a smaller part of space, though the latter is used more in transmit mode to improve isolation, to pass more stringent certification at higher frequencies. It will however offer a better downlink on a receive only system, but only on very close satellites where they have similar bouquet frequencies.</p><p></p><p>In a dual optics installation, all angles designed into the geometry, including the feed design need to be far better than the single reflector / LNBF combination, much like a quality magnifying glass when pitted against an average microscope.</p></blockquote><p></p>
[QUOTE="Channel Hopper, post: 1035445, member: 175144"] The advantage of gregorian/cassegrain designs is the improved cross polarisation isolation, so for receive/transmit application it does have an advantage (caveat co-pol systems). The longer path to the feed from the primary reflector can also give a higher rejection from adjacent satellite and background noise since the feed is looking at a smaller part of space, though the latter is used more in transmit mode to improve isolation, to pass more stringent certification at higher frequencies. It will however offer a better downlink on a receive only system, but only on very close satellites where they have similar bouquet frequencies. In a dual optics installation, all angles designed into the geometry, including the feed design need to be far better than the single reflector / LNBF combination, much like a quality magnifying glass when pitted against an average microscope. [/QUOTE]
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Satellite Systems - What to Buy - What to install
I Will Be Reckless.
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