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Topic: Balun

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	balun: teory
		May be baluns are still a mystery for hams; the only way to understand it is learning what it is and how to use it.
		The word balun means balanced-unbalanced: it's used to adapt a balanced device to an unbalanced one; in a balanced device (as larger type of antennas) we have on both terminal the same voltage respect to the ground (if not so it's an unbalanced device);
		This new wire, when its impedance is low, change the dipole impedance so we can have high S.W.R; this is the reason why (without balun) varying the coaxial cable length the S.W.R. changes.
	www.qsl.net /iz7ath/web/02_brew/11_balun/pag01_eng.htm (0 words)

	Test, measure balun, and compare antenna baluns or balums
		Heating limits in an HF balun, regardless of load impedance, is almost exclusively due to losses in the core.
		The air-core balun is good only for a three or four-to-one frequency range, unless you pick a winding style and size that places unwanted series resonances outside desired bands.
		This type of balun is unsuitable for non-symmetrical systems such as off-center-fed antennas, verticals, or antennas with the feedline paralleling the antenna (even at a fairly large distance).
	www.w8ji.com /Baluns/balun_test.htm (1142 words)

	Balun - AA5TB
		A balun is a device that is used at the feedpoint of a balanced antenna when an unbalanced feedline is desired to feed the antenna.
		A common example of where a balun would be desired is at the feedpoint of a dipole antenna when a coaxial transmission line is used.
		Next the balun was connected to the SO-239 connector and then the pipe was slid over the balun and cemented in place with PVC cement.
	www.aa5tb.com /balun.html (627 words)

	Putting a Balun and a Tuner Together
		That is use a balun on the output of an unbalanced tuner as shown in figure 1.
		That is, use a balun at the input of an unbalanced tuner as shown in figure 2.
		That is, use a balun on the input of a balanced tuner as shown in figure 3.
	fermi.la.asu.edu /w9cf/articles/balun (3815 words)

	Planar microstrip balun - Patent 5304959
		A planar balun including first and second spaced parallel elongated conductors on one surface of a ceramic, plastic, polymer, synthetic fiber or a composite substrate and a third elongated conductor on a second surface of the substrate opposite from the first and second conductors.
		The planar balun as defined by claim 1 wherein said length, L, is a quarter wave (.lambda./4) of input signal frequency.
		Briefly, the balun comprises two spaced parallel conductors formed on one surface of a dielectric substrate with a floating conductive plate on the opposing surface of the substrate.
	www.freepatentsonline.com /5304959.html (1612 words)

	MySpace.com - Balun - Astoria, NY / Kent, OH / San Juan - Indie / Electronica / Acoustic - www.myspace.com/balun
		MySpace.com - Balun - Astoria, NY / Kent, OH / San Juan - Indie / Electronica / Acoustic - www.myspace.com/balun
		Jose (melodica, glockenspiel, synths, omnichord, laptop, some drums, balun drawings, photography, visuals/animations, web design), Angelica (toy piano, celtic harp, violin, glockenspiel, accordion, synths, music box, melody harp, omnichord, voice, found sounds), Andres (electric and acoustic guitar, cuatro, melodica, bass, synths), and Nora (bass guitar and tiple).
		Algunas personas, específicamente el distinguidísimo señor Robert Balun, nos han dicho que nuestra música les da sueño.
	www.myspace.com /balun (0 words)

	Chip Balun: Definitions & Measurement Methodology - Johanson Technology
		A balun (a compound term meaning “balanced-unbalanced”) is a passive bidirectional device designed to transform impedance.
		It is difficult to provide accurate characterization of baluns for two primary reasons: it is a 3-port device, and the input an output typically have different impedances from each other, making network analyzer calibration more difficult.
		The balanced ports of one of the baluns are directly connected to the balanced ports of the other balun.
	www.johansontechnology.com /technicalnotes/cbn (917 words)

	Balun Kits
		Baluns are used to connect balanced antennas to unbalanced transmission lines (coaxial cable).
		Also included are three lengths of shrink tubing to enclose the balun and hold it in place on the cable.
		The baluns work from 3.5 to 1000 MHz and allow use of RF power to the full capability of the cable.
	www.palomar-engineers.com /Balun_Kits/balun_kits.html (182 words)

	iv3sbe Balun Theory
		Baluns (BALanced to UNbalanced) are still a mystery for hams; the only way to understand this is to learn what it is and how to use it.
		The word balun means balanced-unbalanced: it's used to adapt a balanced device to an unbalanced one.
		In a balanced device (as most type of antennas) we have on both terminal the same voltage referred to common ground (if it's not then is an unbalanced device).
	www.iv3sbe.webfundis.net /html/BALUN.htm (299 words)

	W2FMI High Power BALUNS
		It must be pointed up that a 1:1 balun should never be used on the second harmonic of a half-wave center-fed dipole (like an 80 meter dipole being used on 40 meters).
		The 4:1 baluns in antenna tuners can be subjected to very hostile conditions (mainly ver high impedances and hence, high voltages) depending upon the length of the transmission lines.
		For antenna tuners, experience has shown that a balun with a rather large powdered iron toroidal core, connected as a voltage (Ruthroff's design) balun, to the be preferred choice.
	www.bytemark.com /products/baluns.htm (773 words)

	Deep Red - True Horror for The Ages
		Balun is an unrepentant hippie who also enjoys drawing, painting, blues guitar, collecting books, and chainsaw chooglin.
		Balun gleefully shows the review, which calls him a genius to visitors to his home.
		Balun sometimes carries his hobby into real life.
	www.zombiebloodbath.com /chas2.html (557 words)

	A balun tutorial design
		A balun tutorial discussing a number of aspects of the design and construction of baluns for the amateur radio design of your next electronic project
		An old typical usage of the balun was (and still is) with TV antennas.
		The only difference is we are dealing with R.F. which of course is very high A.C. A practical 300 / 75 ohm balun would consist of four pieces of 0.4mm wire wound 2 1/2 turns through a balun core (look a bit like binoculars).
	my.integritynet.com.au /purdic/baluns.htm (482 words)

	Balun : Antennas: Baluns
		Balun Theory - The word balun means balanced-unbalanced: it's used to adapt a balanced device to an unbalanced one
		Balun is a contraction for BALanced to UNbalanced.
		Transmitting Baluns - One of the most popular Ham-lore rumors is a balun's performance can be tested or evaluated by grabbing the coax and watching for an SWR change.
	www.dxzone.com /catalog/Antennas/Baluns (1036 words)

	CHOICECYCLE \|DIY ECONOMY SECURITY CAMERA PACKAGE with MOTION DETECT RECORDING, REMOTE VIEW, NETWORK VIEWABLE, WIRELESS ...
		It’s typically (but not always) a transformer where one side is connected to a signal and a ground (such as coax), and the other side has both conductors floating relative to ground, with our signal between them.
		The ability to reject this ‘common’ signal, while receiving the ‘differential’ signal is the basis of any balun (or active differential amplifier.) Again, a balun is required at each end of the wire.
		On the balanced side of the balun, one puts a zero amplitude differential signal on the two wires (they’re shorted together), plus a large amplitude common signal (big voltage relative to ground).
	www.choicecycle.com /BALUN.htm (1602 words)

	Page Title
		A special type of transformer in the balun adapts the 75 Ohms unbalanced output of a camera to a signal suitable for a balanced twisted pair of 100 Ohms of impedance.
		At the other end of the twisted pair, another balun is installed in order to return to the 75 Ohms unbalaced output which can be connected to a coaxial cable compatible with the input of any monitor, VCR or multiplexer.
		A TW-1000A passive balun connected to the camera adapts the 75 Ohms unbalanced output to a signal suitable for a balanced twisted pair of 100 Ohms impedance.
	www.stealthlabs.com /baluns (533 words)

	BUILD AN AIR WOUND 1:1 CHOKE BALUN FOR HF - THE UGLY BALUN!
		When the connection is to a coaxial cable, WITHOUT A BALUN, this cannot occur because currents flowing inside the cable from the connection to the inner conductor are separated from those flowing on the outside from the connection to the shield, and the result is unbalance causing feeder radiation.
		The distributed-capacitance of the balun is increased and the RF-lossy vinyl jacket of the coax is subjected to a high RF-voltage.
		I was using it on a dipole for 80/40 meters.
	www.hamuniverse.com /balun.html (898 words)

	Intelix HDMI-F over Cat 5 Balun
		The HDMI-F balun system is powered on the send end.
		The Intelix HDMI-F is HDCP compatible; however, you must verify your source and destination devices support (or don't support) HDCP encryption.
		The Intelix HDMI-F balun will also work if neither device is HDCP compatible.
	www.avovercat5.com /products/hdmi.htm (321 words)

	RF transformer types, balun transformer, cable, antenna impedance matching
		Balun A balun is a device designed to convert between balanced and unbalanced electrical signals, such as between coaxial cable and ladder line.
		Balun Design lattice-type balun, In the design of mixers, push-pull amplifiers, baluns are used to link a symmetrical (balanced) circuit to a asymmetrical (unbalanced) circuit
		Putting a balun and tuner together commercial antenna tuners use unbalanced circuits such a Pi-, T-, or L-network to match unbalanced loads to 50 ohms for our transmitters.
	www.educypedia.be /electronics/transformertypesrf.htm (593 words)

	Balun (Site not responding. Last check: )
		Centaur Baluns are the "state of the art" in balancing an unbalanced (Coax) line to a balanced feed (antenna, ladder line, etc.).
		B11W10-50 1:1 Dipole balun matches 50 ohm coax with balanced (of equal length) wires cut to the proper frequency.
		B41LW10-50 4:1 Ladder Line balun matches 50 ohm coax to 200 ohm or 450 ohm ladder line and then to a wire antenna cut to the proper length for frequency.
	www.baluns.com /balun.htm (90 words)

	Choosing the Correct Balun
		Current baluns isolate the device connected at one end from the device connected at the other end, so the balanced terminals can be used to feed unbalanced or balanced loads equally well.
		Tuner baluns (denoted by "T" at the end of the balun part number) have slightly higher SWR when the load is perfectly matched, when no tuner is required.
		The balun should be located such that the coax between it and the tuner is as short as possible BUT do not route the parallel line so close to the tuner or the rest of the station equipment that RF feedback occurs.
	www.dxengineering.com /TechArticles.asp?ID={3E5220F7-2D0F-45B5-85F7-3B654F804C4F} (4576 words)

	MuxLab VideoEase - Pan,Tilt, Zoom Balun
		The VideoEase PTZ Balun allows CCTV video and "up-the-coax" Pan, Tilt, Zoom (PTZ) control signals to be transmitted via a single unshielded twisted pair (UTP) cable for more versatile cabling.
		Used in pairs, the PTZ Balun allows CCTV security and surveillance equipment to be integrated into structured cabling systems.
		The VideoEase PTZ Balun provides a versatile cabling solution for CCTV security and surveillance by making use of standard UTP cabling techniques to connect digital coax PTZ and video via a single unshielded twisted pair.
	www.muxlab.com /products/ve_cctv_ptz_balun.html (105 words)

	Remote Balun 4
		The power rating of the remote balun is based on normal SSB and CW duty-cycles and moderate impedance levels.
		Most transmatches use a built-in balun to convert the transmatch's unbalanced output to a balanced output.
		Unfortunately, the balun used is almost always a toroidal voltage-type design.
	www.radioworks.com /cremote.html (980 words)

	A Simple 75-ohm Coax Balun for 88-108 MHz (Site not responding. Last check: )
		The balun is most effective when placed at the feedpoint where shield current is highest.
		For additional current suppression, form the feedline into a second balun a quarter wavelength away from the first (30" midband, 32.5" low end).
		But computer simulation of a dipole, balun, and coaxial feedline with a traveling wave on the shield indicates that shield pickup should be at least 19 dB below the antenna signal over the entire FM band.
	users.tns.net /~bb/balun.htm (475 words)

	All Band Antenna Designs - LongWire Balun
		The tests we carried out from 500Khz to 30Mhz gave an average improvement of 4 S units, when tested with our current balun incorporated into the design we had computer and electrical interference drop by up to 10 DB....We had to run the tests a dozen times to make sure the readings were correct.
		By grounding the balun directly under the vertical radiator of a Windom a very low noise installation is realised.
		The best balun in my humble opinion is the Guanella type balun using a toroid with an initial permeability between 125 and 300.
	dxantennas.com /wst_page4.php (414 words)

	W1CG Low Power Balun Kit (Site not responding. Last check: )
		Not your everyday balun, the W1CG Low Power Balun has been meticulously optimized and tested to ensure top performance at QRP power levels.
		It benefits from a balun (BALanced to UNbalanced device) to convert the unbalanced output from an antenna tuner to the balanced input of the transmission line.
		To help fill this void, this kit concerns a small, low power 4:1 current balun that is easy to build and has good performance from 160 through 10 meters.
	www.njqrp.org /balun (315 words)

	Stereo Audio Balun
		The Stereo Audio Balun is ideal for corporate AV, assembly halls, schools, and virtually any other situation involving structured audio distribution.
		Connect the RCA inputs from the audio source equipment to the balun and connect a cat.
		Baluns also extend transmission distances, passively transmitting audio and video signals up to 2500 feet and actively transmitting VGA signals up to 550 feet.
	www.smarthome.com /7821sa.html (449 words)

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