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- Feed_horn abstract "In parabolic antennas such as satellite dishes, a feedhorn (or feed horn) is a small horn antenna used to convey radio waves between the transmitter and/or receiver and the parabolic reflector. In transmitting antennas, it is connected to the transmitter and converts the radio frequency alternating current from the transmitter to radio waves and feeds them to the rest of the antenna, which focuses them into a beam. In receiving antennas, incoming radio waves are gathered and focused by the antenna's reflector on the feed horn, which converts them to a tiny radio frequency voltage which is amplified by the receiver. Feed horns are used mainly at microwave (SHF) and higher frequencies.The feedhorn also selects the polarization of the waves to be received, which helps to attenuate unwanted signals from adjacent channels and transponders, and from other communications satellites at nearby orbital positions. This can be either horizontal or vertical if the polarization is linear, or clockwise or counterclockwise (also called left- and right-handed) if it is circular. Certain devices can also allow a feedhorn to accept both linear and circular, though these cause a slight insertion loss to all incoming signals.When used with a parabolic reflector or lens antenna, the phase center of the horn is usually placed at the focal point of the reflector, with the 3 dB points of the horn's radiation pattern set to be at the edge of the reflector. On a satellite dish, the feedhorn is what is mounted at the end of a mast from the center of the dish, or on tripod legs mounted to the edge of the dish.In satellite dishes, part of the receiver electronics, the RF front end, is usually mounted in a box just behind the feed horn. This converts the high satellite microwave downlink frequencies to a lower frequency so it can be more easily sent through the coaxial cable feedline to the receiver inside the building. This is called the low-noise blockconverter (LNB), and the unit consisting of the horn plus the converter is called the LNB with feedhorn (LNBF).".
- Feed_horn thumbnail Hughes_Direcway_LNB.jpg?width=300.
- Feed_horn wikiPageID "53788".
- Feed_horn wikiPageLength "3190".
- Feed_horn wikiPageOutDegree "48".
- Feed_horn wikiPageRevisionID "667431814".
- Feed_horn wikiPageWikiLink Adjacent_channel.
- Feed_horn wikiPageWikiLink Alternating_current.
- Feed_horn wikiPageWikiLink Attenuation.
- Feed_horn wikiPageWikiLink Category:Radio_frequency_antenna_types.
- Feed_horn wikiPageWikiLink Category:Satellite_broadcasting.
- Feed_horn wikiPageWikiLink Circular_polarization.
- Feed_horn wikiPageWikiLink Clockwise.
- Feed_horn wikiPageWikiLink Coaxial_cable.
- Feed_horn wikiPageWikiLink Communications_satellite.
- Feed_horn wikiPageWikiLink Feed_line.
- Feed_horn wikiPageWikiLink Focal_cloud.
- Feed_horn wikiPageWikiLink Focus_(optics).
- Feed_horn wikiPageWikiLink Frequency.
- Feed_horn wikiPageWikiLink Half_power_point.
- Feed_horn wikiPageWikiLink Horizontal_plane.
- Feed_horn wikiPageWikiLink Horn_antenna.
- Feed_horn wikiPageWikiLink Insertion_loss.
- Feed_horn wikiPageWikiLink Lens_antenna.
- Feed_horn wikiPageWikiLink Linearity.
- Feed_horn wikiPageWikiLink Low-noise_block_downconverter.
- Feed_horn wikiPageWikiLink Microwave.
- Feed_horn wikiPageWikiLink Orbital_position.
- Feed_horn wikiPageWikiLink Parabolic_antenna.
- Feed_horn wikiPageWikiLink Parabolic_reflector.
- Feed_horn wikiPageWikiLink Phase_center.
- Feed_horn wikiPageWikiLink Polarization_(waves).
- Feed_horn wikiPageWikiLink RF_front_end.
- Feed_horn wikiPageWikiLink Radiation_pattern.
- Feed_horn wikiPageWikiLink Radio_frequency.
- Feed_horn wikiPageWikiLink Radio_masts_and_towers.
- Feed_horn wikiPageWikiLink Radio_receiver.
- Feed_horn wikiPageWikiLink Radio_wave.
- Feed_horn wikiPageWikiLink Satellite_dish.
- Feed_horn wikiPageWikiLink Signaling_(telecommunications).
- Feed_horn wikiPageWikiLink Super_high_frequency.
- Feed_horn wikiPageWikiLink Transmitter.
- Feed_horn wikiPageWikiLink Transponder.
- Feed_horn wikiPageWikiLink Tripod.
- Feed_horn wikiPageWikiLink Vertical_direction.
- Feed_horn wikiPageWikiLink File:DualPolarityAntennaFeedHorn.jpg.
- Feed_horn wikiPageWikiLink File:Hughes_Direcway_LNB.jpg.
- Feed_horn wikiPageWikiLink File:Radar-hatzerim-1-1.jpg.
- Feed_horn wikiPageWikiLinkText "Feed horn".
- Feed_horn wikiPageWikiLinkText "feed antenna".
- Feed_horn wikiPageWikiLinkText "feed horn".
- Feed_horn wikiPageUsesTemplate Template:Telecommunications.
- Feed_horn wikiPageUsesTemplate Template:Unreferenced.
- Feed_horn subject Category:Radio_frequency_antenna_types.
- Feed_horn subject Category:Satellite_broadcasting.
- Feed_horn hypernym Antenna.
- Feed_horn type Building.
- Feed_horn comment "In parabolic antennas such as satellite dishes, a feedhorn (or feed horn) is a small horn antenna used to convey radio waves between the transmitter and/or receiver and the parabolic reflector. In transmitting antennas, it is connected to the transmitter and converts the radio frequency alternating current from the transmitter to radio waves and feeds them to the rest of the antenna, which focuses them into a beam.".
- Feed_horn label "Feed horn".
- Feed_horn sameAs Q7884069.
- Feed_horn sameAs Bocina_de_alimentación.
- Feed_horn sameAs Cornet_dalimentation.
- Feed_horn sameAs m.0f2lk.
- Feed_horn sameAs Q7884069.
- Feed_horn wasDerivedFrom Feed_horn?oldid=667431814.
- Feed_horn depiction Hughes_Direcway_LNB.jpg.
- Feed_horn isPrimaryTopicOf Feed_horn.