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Topic: Feed horn

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	QRR Series Custom Feed Horn Antennas
		These horn antennas can be designed and produced to satisfy virtually any application or equipment requirement and can be fully tested at QuinStar to determine their precise radiation patterns and gain.
		Beamwidth of the majority of conical and scalar horns is in the range of 6 to 40 degrees while broad beam pyramidal and sectoral horns range from 25 to 90 degrees at half-power full width points (3 dB beamwidth).
		The geometric design of the feed horns is carefully conducted to provide the best possible performance in a relatively compact size.
	www.quinstar.com /qrr_custom_feed_horn_antennas.html (529 words)

	NationMaster - Encyclopedia: Feed horn (Site not responding. Last check: 2007-10-15)
		In the rest position the feed horn is moved to be received within the confines of the parabolic reflector concave inner surface.
		Therefore, the feed horn 60 must be positioned at the focal point of the parabolic reflector, which focal point is in alignment with the focal axis 54.
		An important feature of the invention is a means to automatically lower the feed horn 60 to within the confines of the interior concave surface 18 of the parabolic reflector when the reflector is in its rest position, that is, where the focal axis 54 is perpendicular to base plate 26.
	www.nationmaster.com /encyclopedia/Feed-horn (1206 words)

	U.S. Patent: 5554998 - Deployable satellite antenna for use on vehicles - September 10, 1996
		The feed horn is supported at the distal end of a feed arm having a first segment attached to the reflector support extending outward between the base and reflector, and a second segment pivotably connected to the distal end of the first segment.
		The feed horn segments move between an extended position in which the feed horn is positioned to receive signals reflected from the reflector, and a folded position in which the feed horn is positioned adjacent to the reflector.
		The feed horn segments move between an extended position in which the feed horn is positioned to receive electrical signals reflected from the reflector, and a folded position in which the feed horn is positioned adjacent to the reflector.
	www.everypatent.com /comp/pat5554998.html (4020 words)

	Antenna Feeders
		A special case may be made for feeds from a waveguide horn to a satellite reflector dish, in so-called "offset feed" arrangements.
		The radiation passes from the horn feed to the reflector dish through free space, where superposition of fields applies.
		The main beam is then directed away from the horn primary radiator and the interaction between feed and antenna is minimised.
	www.ee.surrey.ac.uk /Personal/D.Jefferies/feeds.html (1426 words)

	Millimeter wave and infrared sensor in a common receiving aperture - Patent 5214438
		The feed horn input/output 12 is located at the focus 18 formed by the primary parabolic mirror 20 and a dichroic element 24 located between the feed horn 12 and the primary mirror 20 on the axis 16.
		The feed horn 12 is fed by a plurality of waveguides 80.
		The feed horn 12 is supported by waveguides 80' centrally on the axis 16 and the feed horn 12 has an aperture 90 directed towards the primary reflector 20 on the axis 16.
	www.freepatentsonline.com /5214438.html (5329 words)

	Horn Flies - The Merck Veterinary Manual
		Horn flies are found in much larger numbers and for longer periods of time in the southern and southwestern USA.
		Horn flies cause great economic losses annually in the USA; 14% reductions in weight gains on range cattle and losses of 12-14 lb (5-6 kg/head) in weaned calves are common.
		Horn flies can be easily identified by their dark color, size (~3-6 mm long, about half the size of a stable fly), and bayonet-like proboscis that protrudes forward from the head.
	www.merckvetmanual.com /mvm/htm/bc/71708.htm (654 words)

	Dual mode feed horn
		Thus, in the illustrative embodiment, the feed horn 10 has a stepped segment 12 for receiving microwaves from the waveguide 11 and transmitting them to an elongated cylindrical segment 13 which radiates the microwaves onto a reflective antenna, typically a parabolic antenna (not shown).
		With this feed horn, not only is the TM.sub.11 mode generated to produce a dual mode feed to the antenna, but also the wide band VSWR is minimized and the pattern bandwidth is maximized.
		Also, the patterns produced by the single-step horn included significant side lobes in the E plane at the upper and lower ends of the frequency range, thereby indicating a narrow pattern bandwidth in the E plane.
	www.skk-banjaluckapivara.com /invent/distortion_generator/dual_mode_feed_horn.html (1572 words)

	Monterey Bay Aquarium: Online Field Guide
		Horn sharks feed on seafloor invertebrates, especially sea urchins and crabs, and occasionally on small fishes.
		The horn shark’s average length is just over three feet, and it’s named for its large fin spines.
		Slow and sluggish, horn sharks spend their days hidden in crevices or among rocks—unseen for the most part since their coloration matches the muddy browns and greens of their surroundings.
	www.mbayaq.org /efc/living_species/default.asp?hOri=0&hab=5&inhab=212 (279 words)

	Dual-Frequency Airborne Scanning Rain Radar Antenna System
		The combination of the common-aperture feed horn with the small (0.3) focallength- to-diameter ratio of the paraboloidal reflector makes it possible for the overall system to be compact enough that it can be mounted on a DC-8 airplane.
		The input ports are oriented orthogonally and carefully positioned and the depths of the corrugations in the feed horn were chosen carefully, all in an effort to minimize the overall level of cross-polarization and side-lobe level in the system.
		Instead, the feed horn is designed so that the combination of locations is optimal in the sense that it yields an optimal combination of gains, matched 3-dB widths, low cross-polarization, and low side-lobe levels.
	www.nasatech.com /Briefs/May04/NPO30506.html (458 words)

	User Stories : SARA : Simulations key to non-lethal microwave weapon
		A feed horn is a hornshaped medium for propagating electromagnetic waves, a "waveguide" that conveys electromagnetic signals between a transceiver and reflector.
		At a glance, the pyramidal feed horn from the HPM antenna (Fig 2) would be mistaken for a commercial L-band (1.1-1.7 GHz) microwave feed horn except for the thick dielectric window on the face of it.
		Having the feed horn enclosed by a window allows the designers either to remove air from within the horn or fill it with a gas that slows down electrons and eliminates the arc.
	www.comsol.com /stories/sara/index.php?print_layout=1 (961 words)

	Shortened dual-mode horn antenna - Patent 4996535
		The gain of a shaped beam reflector antenna is dependent upon the radiation properties of the individual feed horn antennas of the array, which in turn depends upon the illumination of the aperture of each horn of the array.
		The feed arrangement is adapted for receiving signal and for coupling the signal into the waveguide by first and second electric poles located at diametrically opposite sides of the axis.
		The feed cables may be coupled through the center of a hollow center conductor, with the electric probes projecting through holes in the wall of the center conductor rather than through the exterior waveguide walls.
	www.freepatentsonline.com /4996535.html (5593 words)

	N3AOG Parabolic Antennas and Their Feeds (Site not responding. Last check: 2007-10-15)
		Dish antennas and their feeds are a mystery to the majority of Hams who have not spent a lot of time paging through the few articles that have been published over the years.
		Feeds by design have a specific beamwidth, this is what must be taken into consideration when choosing your feed for your dish in question.
		This feed was designed for a reflector with a f/D of.375, The “L” dimension determines the beamwidth of the feed, if you have a dish with a different f/D “L” wiil have to change.
	members.ij.net /packrats/Article_9/DISH_AOG.html (2762 words)

	G3PHO DUAL MODE HORN FEED FOR 10GHz
		Being more sharply defined, the horn sees the dish and not the ground behind it and thus is also a quieter feed in that less ground noise is picked through "spill over" around the edge of the dish.
		Feeds with asymmetrical E and H planes are harder to position accurately.
		The finished horn was mounted on the Amstrad feed clamp, although the plastic clamp had to be filed a little to make it slightly wider than the fitting for the old Blue Cap horn.
	www.qsl.net /g3pho/horn.htm (1425 words)

	Care and Feeding of a SETI Dish
		That is, with respect to the center of the dish, signals reaching the feed from the very edge of the dish are 10 dB lower in amplitude.
		The choke ring must be designed so as to slide back and forth on the waveguide horn, in order to optimize the illumination pattern of the feed for noise vs. gain, as well as the particular focal length to diameter ratio (F/D) of the dish being used.
		The flange by which the scalar ring attaches to the waveguide horn assembly can be drilled and tapped for set-screws, or notched to simulate finger-stock, and held in place with a large hose clamp.
	www.setileague.org /hardware/feedchok.htm (1920 words)

	Alaska Public Broadcasting, Inc. - Troubleshooting - Satellite Earth Station
		Not all dishes are equal; some have their feed horn mounted at the back of the dish, and use an extra reflector to capture and focus the satellite’s microwave energy into the feed horn.
		Others have their feed horns mounted on arms in front of the dish where the microwave energy is reflected to a single point of focus.
		In either case, the feed horn must be free of debri and moisture to effectively conduct the microwave energy into the LNB, or Low Noise Block converter.
	www.alaska.net /~arcs/troubleshooting/dish.html (392 words)

	VSAT feed assembly with OMT, transmit and receive ports and filters.
		For mounting, the transmit module must be attached at the left and the whole assembly clamped using rings on the 2.5 W transmit module plus the circular tube just behind the feed horn.
		This arrangement is suitable where the transmit arrangement involves a flexible waveguide and the transmit modules are fixed to the feed arm..
		Start with the feed set to receive nominal horizontal or vertical and then turn the feed clockwise if the polarisation angle is positive number, while facing the satellite.
	www.satsig.net /feed1.htm (509 words)

	Duncraig.NET - Galaxy Dish Mod 18dbi 24dbi Modding
		Detach the feed horn from the mesh dish.
		Using the end of the down-converter from the Galaxy's feed horn measuring 1/2 wavelength which is 64mm of the down-converter metal tip I cut the 1/4 wavelength which is half the 1/2 wavelength which makes it 32mm of the circuit board.
		Before connecting the cable, make sure you have the cable through the feed horn before connecting the cable to the tip.
	www.duncraig.net /galaxymod.html (406 words)

	TREVOR MARSHALL - Biquad feed for primestar dish
		But they are hard to feed because the f/d ratio varies from about 0.5 in the vertical axis to 0.8 on the horizontal axis.
		Then bend the 4 remaining right angles so that the element sides are rectangular, and there is about a 1.5mm gap for soldering to the feed.
		Solder an alligator clip to either of the high voltage apex (39mm from the feed) of a single 152 mm loop, and clip that to the antenna stub you are currently using.
	www.trevormarshall.com /biquad.htm (922 words)

	Horn's Feed Mill, Inc. Warning Letter (Site not responding. Last check: 2007-10-15)
		These deviations cause feed manufactured at your facility to be adulterated within the meaning of Section 402(a)(4) of the Federal Food, Drug, and Cosmetic Act (the Act) and misbranded within the meaning of Section 403(f) of the Act.
		Failure to use clean-out procedures or other means adequate to prevent carryover of protein derived from mammalian tissues to animal protein or feeds that may be used for ruminants, to comply with 21 CFR 589.2000(e)(1)(iii)(A) and (B).
		As a manufacturer of materials intended for animal feed use, you are responsible for ensuring that your overall operation and the products you manufacture and distribute are in compliance with the law.
	www.fda.gov /foi/warning_letters/g4738d.htm (829 words)

	Sonnet Software- CST Microwave Studio Applications- Circular Waveguide Horn
		A circular waveguide is used for feeding the horn, with a diameter of 2 cm.
		The input reflection coefficient for the waveguide feed horn as computed by MicroWave Studio is shown in Figure 2.
		The orientation for the plot is the same as the horn antenna orientation shown in Figures 3 and 4.
	www.sonnetusa.com /products/cst/application_waveguide.asp (350 words)

	Template and construction outline for Feed horns for 5.7GHz and 3.4GHz
		When it comes to soldering the seams a supply of small G or toolmakers clamps, to hold the parts together and act as a heat sinks on the previously soldered seams to prevent them from coming unsoldered, will be useful.
		Finally, to prevent corrosion, I coat the inside of the horn with "spray on" flux (using a brush to distribute it evenly) and spray the outside with Hammerite.
		When it comes to soldering the horn onto the waveguide the thermal conductivity of solid copper becomes a disadvantage so the template is for construction from copper laminate.
	myweb.tiscali.co.uk /g4nns/FeedHorn.html (678 words)

	feed \| English \| Dictionary & Translation by Babylon
		The word feed has a number of uses:Feeding is supplying food.
		Feed as a noun often refers to food given to or meant for livestock (also called "fodder").In telecommunication, the term feed has the following meanings: To supply a signal to the input of a system, subsystem, equipment, or electronic component, such as a transmission line or antenna.
		A transmission facility between (a) the point of origin of a signal, such as is generated in a radio or television studio, and (b) the head-end of a distribution facility, such as a broadcasting station in a network.
	www.babylon.com /definition/feed/English?uil=English (659 words)

	Feed horn (Site not responding. Last check: 2007-10-15)
		In satellite dish and antenna design parlance, a feed horn is a horn shaped waveguide used to convey electromagnetic signals between the transceiver and the reflector.
		Feed horns flare out at the mouth and are similar in appearance to the bell of a trumpet or other musical instruments.
		It uses material from the Wiktionary page "Feed".
	www.serebella.com /encyclopedia/article-Feed_horn.html (279 words)

	X-band Feed Junction Diplexer "Doubles" the DSN
		The diplexer routes the transmit signals to the antenna feed horn, preventing that signal from passing to the very sensitive LNA, while simultaneously allowing the weak downlink signal to go through the feed horn, the diplexer, and into the LNA.
		This new feed junction diplexer (Figure 2) has a much shorter ambient temperature waveguide path length with resultant lower losses and noise temperature than current diplexed DSN waveguide configurations, and is applicable to either BWG or non-BWG antennas.
		Figure 3 is a picture of the feedhorn, feed junction diplexer, and LNA as configured in preparation for a demonstration at DSS 13.
	deepspace.jpl.nasa.gov /technology/TMOT_News/FEB97/xbndfeed.html (704 words)

	Jonsa Dish
		For maximum performance, we tested the Pansat LNB and feed horn, and it performed better than a high end 15 degree LNBF.
		When using the Ku-band feed, use the outermost holes to fasten the legs to the scalar rings or feed assembly.
		Also, to make the feed come a bit close to the dish, turn or "twist" the scalar rings to one side before tighten the tripod legs.
	www.smallear.com /dish5c (644 words)

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