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Topic: Feedhorn

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	Welcome To Chaparral Communications
		Feedhorn installation tips - Focus on feeds from those feedhorn fanatics in Technical Support.
		Feedhorn troubleshooting tips - How to section on recognizing and correcting feed\polarity problems.
		In order to find the correct focal distance for tracking, the feedhorn must be at the correct distance from the center of the dish, properly oriented, centered and perpendicular to the plane of the antenna.
	www.chaparral.net /support/trouble/feedhorn.html (1598 words)

	Feed horn - Wikipedia, the free encyclopedia
		In satellite dish and antenna design parlance, a feedhorn (or feed horn) is a horn antenna used to convey radio waves between the transceiver (transmitter and/or receiver) and the reflector.
		The feedhorn also selects the polarity 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.
		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.
	en.wikipedia.org /wiki/Feedhorn (246 words)

	Conifer Antenna Testing
		Feedhorn #1 is the most commonly performed modification, utilising the original Conifer dipole, which has been cut off the down-convertor, with the coax soldered to the PCB balun.
		Feedhorn #2 consists of a new balun constructed from copper pipe and a galvanised nail, with the dipole constructed from a 61x12mm section of PCB, with a 2.5m length of RG-213 coax.
		Feedhorn #3 has a new dipole constructed from copper tube, brass tube and brass plate, with the dipole length and balun length as close as possible to 1/2 and 1/4 wave length respectively, and has a 2.5m length of CNT-400 coax.
	martybugs.net /wireless/conifertest.cgi (1018 words)

	Satellite Receiving Antennas (Site not responding. Last check: 2007-09-17)
		There are two main design disadvantages, however: the feedhorn and feed support structure block part of the reflector surface and the feedhorn must look back at the dish at such an angle that it can also intercept noise from the "hot" earth located directly behind the reflector.
		The feedhorn's illumination of the antenna must be attenuated or tapered to minimize noise contribution from the perimeter of the dish.
		Motorized dishes may experience feedhorn movement when the antenna is moved from one satellite to the next; heavy winds can also temporarily move the feedhorn away from the antenna's focus.
	www.mlesat.com /antennas.html (2655 words)

	Care and Feeding of a SETI Dish (Site not responding. Last check: 2007-09-17)
		Feedhorn dimensions are typically selected to illuminate the surface of a dish as fully and uniformly as possible, to achieve the highest possible antenna gain.
		The chief determinant of illumination taper for scalar-ring feedhorns is the placement of the choke ring along the waveguide feedhorn.
		He proposes a design wherein the choke ring be mounted to the cylindrical feedhorn on a track, allowing the choke to be readily slid fore and aft during use.
	www.setileague.org /hardware/feedchok.htm (1920 words)

	Section I
		The feedhorn amplifies the signal and sends it to the receiver which turns the signal into a picture usable on a television.
		The feedhorn is set a precise distance from the center of the dish.
		The antenna inside the feedhorn gathers the signal and passes it to the LNB’s, which in turn amplify the signals and sends them to the receiver.
	www.missouri.edu /~ascwww/satellite/html/section_i.html (1660 words)

	EUTELSAT S.A. :: Business With Us
		The radiation of electromagnetic energy from the feedhorn to the surface of the parabolic reflector of a transmit antenna, or the focusing of electromagnetic energy captured by the reflector of a receiving antenna towards the feedhorn.
		The feedhorn is often integrated with LNB in a single mechanical unit.
		An antenna having a feedhorn that is offset from the centre of the reflector.
	www.eutelsat.com /business/2_6_2.html (1723 words)

	bas_rcvr
		The output of the switch is attenuated to bring the level of the noise source signal down to a level comparable with the noise power output of the receiver and injected with a quarter-wave dipole mounted in the L-band feedhorn.
		The feedhorn is an open-ended cavity that permits standing waves from signals of particular wavelengths to be formed.
		A probe is placed in the feedhorn at an antinode (antinode - a region of maximum amplitude) position of the standing wave pattern.
	www.gb.nrao.edu /GBTopsdocs/opman/od_rec_ri_bas_rcvr.htm (1128 words)

	Satellite locator system - Patent 6538612
		A satellite locator system used with a motor home has a parabolic reflector antenna dish, feedhorn and signal converter mounted on a turntable supporting electronic controls and elevation and azimuth motors operable to rotate the turntable and change the elevation of the dish to locate and target a satellite.
		A primary signal receiver or feedhorn 74 mounted on the outer end of arm 73 is located at the focus of dish 57.
		Feedhorn 74 is enclosed in a light or thin cover as it is protected by dome 42.
	www.freepatentsonline.com /6538612.html (6980 words)

	Satellite broadcast Search Engine - www.isat.info
		The scalar feedhorn primarily sees or illuminates the inner portion of the antenna's surface area, while attenuating the signal contribution from the outer portion of the dish by 8 to 22 dB, depending on whether the dish is deep or shallow in its construction.
		Feedhorn Adjustments The distance between the center of the antenna surface and the feedhorn's waveguide opening is called the focal length or (f).
		Another satellite dish specification which has an impact on feedhorn performance is the antenna's focal length (f) to antenna diameter (D) ratio, called the f/D. The distance between the scalar ring plate and the waveguide opening for many feedhorns can be adjusted to a value that matches the f/D spec of the dish.
	isat.info /eng/share/index.php?db=share&category=LNB/Feed-Horn&mode=view&sp=0&id=255 (2743 words)

	R-MC Academics
		The signal collected from the feedhorn is an analog signal, so for the receiver to recognize the data it must be converted to a digital signal.
		The feedhorn is the "collector" located at the focus of the antenna.
		The signal collected by the feedhorn is naturally weak (with any size antenna), so the signal is amplified before it reaches the cables and ultimately the receiver.
	www.rmc.edu /directory/academics/phys/keeble/RadioTelescope/Components.asp (453 words)

	Modifying Conifer Antennas for Wireless Networking - part 2
		Remove the reflector from end of the feedhorn by removing the small screw in the centre of it.
		Remove the nut and washer from the base of the feedhorn, and remove the down-convertor from the feedhorn.
		Separate the metal feedhorn base from the plastic body of the feedhorn, and remove the sticky glue residue using mineral turps.
	martybugs.net /wireless/conifermods2.cgi (1000 words)

	Strong digital mpeg dvb satellite Receiver
		The Chaparral Bullseye II feedhorn is used in satellite systems equipped for reception of C-band (3.7-4.2 GHz) and Ku-band (11.7-12.75 GHz) satellite signals and is compatible with all LNBs designed for these frequencies.
		The Chaparral Dual Feed is an orthomode transducer for simultaneous reception of horizontal and vertical C-band polarities.
		Both the probe and dipole are controlled by the Chaparral servo motor, providing infinite skew adjustment and quick selection of horizontal and vertical rejection with the widest variety of dishes, from.45 to.32 f/D, or as deep as.28 f/D with the optional Golden Ring.
	www.strong1.com /Lnb.htm (296 words)

	Satellite Installations
		When assembling the LNB and feedhorn, make sure that the neoprene gasket that goes between the feedhorn's flange and the mouth of the LNB is seated properly in the groove provided.
		Many feedhorns for prime focus antennas can be broken down into two parts: one is a scalar ring plate which can be adjusted up and down the throat of the feedhorn to match the focal length to antenna diameter ratio of the dish.
		The feedhorn cable is comprised of three color-coded 22 gauge (or larger) stranded wires.
	www.shelburnefilms.com /S_tape04.htm (1772 words)

	[No title]
		External adjusters must be used on antenna to position the feedhorn in exact focal point, for best performance.
		RP-3 C-Band feedhorns are rated for use from 3625 to 4200 MHz.
		Unless otherwise noted, Ku-band feedhorns are rated for "wideband" operation from 10.7 to 12.75 GHz, linear polarization.
	www.global-cm.net /feedhorn.html (306 words)

	Satellite TV Ku-Band Freq. Asked Questions
		Once you have set the throat/scaler ring assembly to the right F/D ratio, you want to attach the feedhorn to the support (quad, tri, or buttonhook) and, without disturbing the F/D setting you did in step 4a above, move the feedhorn in and out until the focal length is set.
		There are various gadgets to do this (one being a laser pointer to tell you where the feedhorn is pointed to), but I have had great luck doing the F/D ratio and the focal adjustment correctly and then "eyeball"ing the centering part to make sure it looks like it is properly centered.
		A weak signal could result from the feedhorn not centered, the focal length wrong, you not being right on the arc, you not being right on a Ku-band satellite, a cable that is slowly going bad, water in the feedhorn, nests in the feedhorn among other factors.
	www.gofastmotorsports.com /kubandfrequentlyaskedquestions.htm (1510 words)

	Question on a Dual C/ku Feedhorn? - SatelliteGuys.US
		I'm sure these dual C/ku feedhorns are intended for the ability to get H and V on multiple receivers.
		With a feedhorn with 2 C lnb's and 2 ku lnb's, they would be centered.
		The way that feedhorn is made, with the 2 C-band lnb's (as well as the 2 ku-band lnb's) 90 degrees different from each other, whether you call it h/v or l/r, the polarity would still be opposite of each other.
	www.satelliteguys.us /showthread.php?t=66978 (1500 words)

	Satellite 911 -- C-Band Helpdesk
		Inside the feedhorn is a small probe that is turned by the servo motor to select vertical or horizontal polarity.
		You need to assure that the scalar ring (the supporting ring for the feedhorn) is parallel to the bottom of the dish and that it is perfectly centered in the dish.
		Now that we have the proper LNB mounted on the feedhorn, the feedhorn mounted on the dish and centered exactly, and the dish mounted on a plumb and properly secure pole we are ready to connect the actuator arm.
	www.satellite911.com /html/installation.html (2229 words)

	Footprints by Dish Size - Adjusting the Polar Mount for Prime Focus Antenna - C/Ku-Band Satellite Systems - Tuning, ...
		In a center focus (prime focus) system, all legs supporting the feedhorn should be the same length, measure them to be sure, and do any adjustment you can if they are not the same length.
		Next, check the distance from three different points on the edge of the dish, to the center of the feedhorn, to be sure feed is set to be in the center of the dish.
		the feedhorn as oil from your fingerprints could interfere with signal reception; in fact, there is no need to remove the plastic cap covering the feed throat probe except to slide on the scalar rings and to measure the focal length, then immediately replace the cap.
	www.geo-orbit.org /sizepgs/tuningp4.html (5235 words)

	SATELLITE FEEDHORNS, LNBS & POLARIZERS (Site not responding. Last check: 2007-09-17)
		The most common type of feedhorn manufactured today is called a scalar feedhorn.
		The distance between the center of the antenna surface and the feedhorn's waveguide opening is called the focal length or (f).
		Dual band hybrid feedhorns place both the C and Ku band waveguide openings directly over the focal cloud of the antenna.
	www.mlesat.com /Article1.html (2713 words)

	AA1YN on the microwaves
		In the meantime, to the left is a photo of a DSS feedhorn modified for use with the DSS dish.
		At this point, I had cut the feedhorn off of the LNB and TIG welded a 1" cube aluminum block onto it and bored out the feedhorn to.795" which is about the dimension of a WC-80 circular waveguide.
		Here is the latest DSS Feedhorn I build a couple of days before the 2003 10G&Up contest with some detail photos.
	www.aa1yn.com /microwave/uwave.html (299 words)

	broadband help » Forums » HughesNet Satellite » [DW7000] Snow on the feedhorn
		There was wet snow on the feedhorn and after I cleaned it, the signal came up to normal.
		I just wonder how I can clean the feedhorn when it is covered with frost at minus 30 degrees Celsius without damaging the thin foil.
		If the feedhorn windows were glass, we'd see a significant loss in usable signal.
	www.dslreports.com /forum/remark,17110676 (1310 words)

	Corner reflectors
		The directivity of this feedhorn is added to that of the parabolic dish.
		In most radars, the feedhorn is covered with a window of polystyrene fiberglass to prevent moisture and dirt from entering the open end of the waveguide.
		One problem associated with feedhorns is the SHADOW introduced by the feedhorn if it is in the path of the beam.
	www.tpub.com /neets/book18/81d.htm (898 words)

	C-Band Satellite Feedhorns and Feedhorn Parts - Stallions Satellite and Antenna
		The Corotor II+ and Corotor II+ Wideband are designed for systems which require reception of both C and KU-Band signals.
		The ADL ADL-OP-101 is a higher quality replacement servo motor that interfaces with the Chaparral PRI E/A and Corotor II+/Corotor II+ Wideband feedhorns, as well as ADL and other feedhorns that accept a Chaparral servo motor.
		The Chaparral feedhorn throat cap keeps insects and other debris out of the throat of Chaparral C and C/KU Band feehorns.
	www.tvantenna.com /products/satellite/cband/feedhorns.html (185 words)

	Welcome To Chaparral Communications
		The Bullseye II feedhorn is used in many home and commercial satellite systems for reception of C-Band satellites used for the broadcast of entertainment television, and for the reception of Ku-Band and hybrid (C/Ku) satellites used for network, business, entertainment and educational television.
		It is equipped with C-Band and Ku-Band orthomode feeds, allowing simultaneous reception of both signal polarities by multiple receivers in the system.
		This makes the Bullseye II feedhorn well suited for use in cable television system as well as in hotels, hospitals, schools, and other locations using multiple receivers for reception of C-Band and Ku-Band signals with a single dish.
	www.chaparral.net /products/feedhorns/bullseye.html (216 words)

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