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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Purpose of Feedhorn
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<blockquote data-quote="Terryl" data-source="post: 1014566" data-attributes="member: 369937"><p>The real general purpose of the feed horn is to help shield the receiving antenna(s) of the LNB from stray signals from outside the beam of the directed signals from the dish.</p><p>Older "C" band LNB's with single polarity antennas were highly susceptible to outside interference,(others used the the frequency's above and below "C" band frequency's for other purposes) so the antennas were located further down in the throat of the casing thus creating a feed that was shielding the LNB's internal antenna(s).</p><p></p><p>Some of the bigger professional dishes used wave guides and tunable filters to cut down on interference, but this was not very practical for the consumer dishes as they were very expensive. </p><p></p><p>Now days on a "C" band LNB the feed horn would just be a tube with the antenna(s) down inside it, some of the older ones used a servo motor to change the antenna polarity, but on a "kU" band LNB it actually looks like a horn, thus the name "Feed Horn" stuck.</p></blockquote><p></p>
[QUOTE="Terryl, post: 1014566, member: 369937"] The real general purpose of the feed horn is to help shield the receiving antenna(s) of the LNB from stray signals from outside the beam of the directed signals from the dish. Older "C" band LNB's with single polarity antennas were highly susceptible to outside interference,(others used the the frequency's above and below "C" band frequency's for other purposes) so the antennas were located further down in the throat of the casing thus creating a feed that was shielding the LNB's internal antenna(s). Some of the bigger professional dishes used wave guides and tunable filters to cut down on interference, but this was not very practical for the consumer dishes as they were very expensive. Now days on a "C" band LNB the feed horn would just be a tube with the antenna(s) down inside it, some of the older ones used a servo motor to change the antenna polarity, but on a "kU" band LNB it actually looks like a horn, thus the name "Feed Horn" stuck. [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Purpose of Feedhorn
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