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Satellite TV receivers & systems support forums
Satellite Systems - What to Buy - What to install
Prime focus vs offset dish
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<blockquote data-quote="Satfaca" data-source="post: 1149160" data-attributes="member: 297203"><p>Absolutely not in line with the theory ... but in practice people get this wrong impression for various reasons, one being the fact that an offset antenna is easier to align due to its bigger beamwidth. And as chaps above mentioned, people simply use one and the same LNBF on both types of the antenna which is absolutely wrong; PFA requires a dedicated PFA feedhorn.</p><p>Also the exact focal distance is much more critical with PFA.</p><p>So shortly, offset is easier to align & has same gain as an PFA, on the other hand PFA is more accurate in pinpointing particular satellite, receives less sidelobes and through this less disturbances from neighbouring satellites.</p></blockquote><p></p>
[QUOTE="Satfaca, post: 1149160, member: 297203"] Absolutely not in line with the theory ... but in practice people get this wrong impression for various reasons, one being the fact that an offset antenna is easier to align due to its bigger beamwidth. And as chaps above mentioned, people simply use one and the same LNBF on both types of the antenna which is absolutely wrong; PFA requires a dedicated PFA feedhorn. Also the exact focal distance is much more critical with PFA. So shortly, offset is easier to align & has same gain as an PFA, on the other hand PFA is more accurate in pinpointing particular satellite, receives less sidelobes and through this less disturbances from neighbouring satellites. [/QUOTE]
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Satellite TV receivers & systems support forums
Satellite Systems - What to Buy - What to install
Prime focus vs offset dish
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