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Topic: Balanced line

	Balanced line - Wikipedia, the free encyclopedia
		In telecommunications, a balanced line or balanced signal pair is a transmission line consisting of two conductors in the presence of ground, which relies on balanced impedances to minimize interference.
		The line is capable of being operated in such a way that when the impedances of the two conductors at all transverse planes are equal in magnitude and opposite in polarity with respect to ground, the currents in the two conductors are equal in magnitude and opposite in direction.
		Balanced lines can carry electrical signals farther than unbalanced lines because any noise on the line will not be balanced and thus gets filtered out.
	en.wikipedia.org /wiki/Balanced_line (473 words)

	Balun - Wikipedia, the free encyclopedia
		A balun is a device designed to convert between balanced and unbalanced electrical signals, such as between coaxial cable and ladder line.
		The balanced end of this balun is at the end where the pipe is wired to the braid.
		The one at left would normally be used to connect a high impedance source, such as a guitar, into a balanced microphone input, serving as a passive DI unit.
	en.wikipedia.org /wiki/Balun (1212 words)

	Balanced Line Technology
		Balanced connections are unlikely to provide much protection against RF ingress- both sides of the balanced input would have to demodulate the RF with exactly the same effectiveness for common-mode cancellation to occur.
		Apart from balancing requirements, a line-level input, as opposed to a microphone input, is expected to have a reasonably high impedance to allow multiple connections to a single output.
		The impedances on each line will be different, but not due to the asymmetrical input impedances of a simple differential amplifier; the hot line impedance is dominated by the output resistance Rs on the hot terminal (100 Ohms) and the cold line impedance is zero as it is grounded at the output end.
	www.dself.dsl.pipex.com /ampins/balanced/balanced.htm (7247 words)

	Tuner + Coax Line + Balun + Balanced Line + Dipole
		Tuner + Coax Line + Balun + Balanced Line + Dipole
		Line lengths in wavelengths are with respect to their own velocities and not to free space velocity.
		HF attenuation on all lines is proportional to Sqrt(F).
	www.smeter.net /antennas/dipole3.php (1660 words)

	Jon_Risch's Web Site
		Connect the AC line input through a safety device to the primaries by connecting the neutral line to one of the "0" terminals, then connect the "120" terminal of that row to the "0" terminal of the other primary side row of terminals, and connect the hot AC line to the remaining "120" terminal.
		Balance it at the audio system, and run a conventional AC line along with the extra technical ground wiring that is required.
		Connect the AC line input through a safety device to the primaries by connecting the neutral line to one of the "0" terminals, then connect the "115" terminal in the middle to the "0" terminal in the middle of the strip of screw terminals.
	www.geocities.com /jonrisch/catch2.htm (2680 words)

	Balanced line: Facts and details from Encyclopedia Topic (Site not responding. Last check: 2007-10-12)
		A transmission line is the material medium or structure that forms all or part of a path from one place to another for directing the transmission of energy,...
		Note: A balanced line may be operated in an unbalanced condition.
		In a data circuit a backward channel is the channel that passes data in a direction opposite to that of its associated forward channel....
	www.absoluteastronomy.com /encyclopedia/b/ba/balanced_line.htm (563 words)

	ZED AUDIO CORPORATION
		Balanced lines are kind of the opposite of their unbalanced cousins.
		This is the simplest form of balanced line input (without the use of a balancing transformer).
		This will affect the CMRR (The ability of the balanced line system to reject noise) of the system and there are more complex circuits which allow the input impedances of both phases to be identical.
	www.zedaudio.com /Technical/Balanced-Line.htm (1287 words)

	G4NSJ BALANCED FEEDER BALANC TRANSMISSION LINE ATU MATCHING
		A resonant line is not terminated in its characteristic impedance.
		With balanced feeder, it is important to keep the line clear of metal objects etc. However, I've just erected an 66 foot doublet fed with 300 ohm 'window' line and, contrary to popular belief, it seems that nothing affects it.
		The reason some articles give a feed line length is because a certain length of balanced line for a certain aerial will give an overall acceptable impedance at the ATU on all bands.
	www.g4nsj.co.uk /balance.shtml (1951 words)

	Balanced Zen Line Stage
		In a balanced circuit, two opposite phases of the signal are present on two otherwise identical input lines.
		Using separate balanced DAC circuits reduces the random noise by 3 dB, the same as if they were in parallel, and reduces common noise by a larger figure.
		This balanced line stage is the classic "differential pair" topology with two identical gain devices connected to develop voltage gain from a differential voltage input.
	cygnus.ipal.org /mirror/www.passlabs.com/balzenp.htm (5845 words)

	Monster Cable - Robert Harley
		A balanced interconnect is recognizable by its three-pin XLR connector.
		Balanced and unbalanced lines are shown in the photograph at the beginning of this chapter.
		When the two identical but opposite polarity signals carried on the balanced line are input to a differential amplifier in the component receiving the signal, noise picked up by the interconnect is rejected.
	www.monstercable.com /RobertHarley/ch11_p07.asp (1464 words)

	Warmongerclub.com: Formations
		The Balanced Line is an old workhorse that has been around for centuries.
		Balanced lines are especially susceptible to formations with concentrations of power.
		The Balanced Line is a steady formation that is very useful to beginners and veterans alike.
	www.warmongerclub.com /articles/pdeflo_formations02.htm (528 words)

	1
		This is illustrated in Figure 4, a phasor diagram of positive-sequence voltages for a balanced wye-connected generator.
		Line currents in a three-phase system can be calculated from phase voltages and impedances.
		Line currents always sum to zero in a delta-connected system because there is no neutral wire.
	www.facstaff.bucknell.edu /wismer/ee491/threephase (598 words)

	Putting a Balun and a Tuner Together
		That is, use a balun on the input of a balanced tuner as shown in figure 3.
		If, for example, the balanced line is poorly routed, the currents in the two wires can become different because of unequal coupling to their surroundings.
		Picking a balanced L network to transform to 50 ohms I can use a parallel capacitor of 304 ohms across terminals 1 and 2 as in figure 9 which has the equivalent circuit shown in figure 10.
	fermi.la.asu.edu /w9cf/articles/balun (3815 words)

	RS422 RS485 Application Note: Chapter 1 Overview
		Although proper connection to the signal ground is important, it isn't used by a balanced line receiver in determining the logic state of the data line.
		A balanced differential line receiver senses the voltage state of the transmission line across two signal input lines, A and B. It will also have a signal ground (C) that is necessary in making the proper interface connection.
		Figure 1.5 shows the condition of the voltage of the balanced line for an RS-232 to RS-422 converter when the line is in the "idle" condition or OFF state.
	www.bb-elec.com /tech_articles/rs422_485_app_note/overview.asp (1721 words)

	Why do I need balanced cables?
		A balanced audio system uses a means of 'mirroring' an audio signal, complete with the second signal being the exact opposite of the 'actual' audio signal.
		A balanced line uses the 'mirrored' audio that is 180 degrees out of phase, to filter/reject external interference.
		When the two lines (hot/cold) are combined at the mixer or other input device, the audio becomes stronger, but the noise is eliminated.
	www.sundancemediagroup.com /articles/balanced_vs_unbalanced_cables.htm (700 words)

	diyAudio Forums - Balanced line questions (Site not responding. Last check: 2007-10-12)
		Now, my understanding is that a balanced line system uses three wires, ground, + and -.
		The reason regular wiring picks up noise is because the ground line (if it is earth ground) is 100% immune to noise but the signal line is not, therefore the noise causes a voltage difference across the wire and this is audible.
		Common-mode means a signal (or more typically noise) which exists equally in magnitude and polarity on both lines, as opposed to differential (or normal) mode where it exists equally in magnitude but of opposite polarity on each line.
	www.diyaudio.com /forums/showthread.php?postid=264869 (731 words)

	Balanced Line Driver with Floating Output
		Uwe has built and tested the unit as shown, and although more complex than the balanced line drivers and receivers presented in the original versions in the Project Pages (see Project 51 for details), it also has better performance.
		Although the modification degrades the "perfect" balance, in reality there is only about a 0.4dB loss of signal when the circuit is connected in unbalanced mode, and this is well within the acceptable range (IMO).
		It is well known to use electronic circuits instead of transformers to balance signals at the outputs or to unbalance them at the inputs.
	sound.westhost.com /balance.htm (3283 words)

	Blue Circle "Music Ring" Balanced Power Line Conditioners by Bob Neill
		And I know that power line conditioners and after-market power cords are attempts to - invoking the most useful if crude metaphor - do what the filter on your water spigot does: to purify what goes through it.
		Therefore, the line and neutral level noise is lower.
		Power line conditioners, if they do what the Music Rings do - and at their price - may be a better investment than that new preamp upgrade or sexy interconnect you're looking at.
	www.enjoythemusic.com /magazine/equipment/0502/bluecirclemusicring.htm (3151 words)

	Stereophile: Ayre Acoustics K-1 preamplifier
		The DC on the two phases of the balanced output were identical but opposite in polarity in the left channel (good), but differed by 1mV in the right (inconsequential).
		The preamp is inverting from its line inputs to its main outputs in the unbalanced mode; in the balanced mode, pin 2 is positive.
		While the shapes of the unbalanced line and phono crosstalk are a little unusual, the channel separation is more than acceptable—and exceptional in the balanced line mode.
	www.stereophile.com /amplificationreviews/609/index6.html (906 words)

	Home Recording dot com BBS - Balanced vs Unbalanced
		Balanced cables transmit signals that are cleaner and fatter than unbalanced.
		A microphone is a balanced line, and I would say most people are using 3 wire XLR cables from a microphone to the mixer.
		For unbalanced, I meant line level signal being fed out of a mixer to an effect unit, or to the input of a multitracker etc versus using a balanced line.
	homerecording.com /bbs/showthread.php?t=4492 (3034 words)

	MLA-1 (Site not responding. Last check: 2007-10-12)
		The P-2 was introduced in 1991 as an entry-level (for us) all-tube balanced line preamp, that was in keeping with our philosphy of supporting the 600 ohm balanced standard.
		Balanced line technology is new to high-end audio, although it has been in use in the recording and broadcast industry for decades.
		Balanced lines work better than single-ended cables, being dramatically more resistant to RF, magnetic and static fields, and are commonly terminated with a low impedance.
	www.atma-sphere.com /support/archive/p2.html (377 words)

	Balanced Line Driver / Line Receiver - Black Widow Audio
		Balanced inputs and outputs are used mainly for professional audio and "High-End" HiFi, for example on many CD players and DACs, it has been used in professional audio for many years.
		This is because the inherent weakness of unbalanced interconnections is that the shield, which is also a signal conductor, is a path for power line related currents that always flow between equipment grounds.
		A balanced connection uses three conductors, two for the signal the twisted pair, and the third, for the shield, the two conductors in the center are twisted pair, one carries the non-inverting signal and the other carries the inverted signal, exactly the same but inverted.
	blackwidowaudio.tripod.com /Projects/bwa_projects3.htm (1030 words)

	Syfer introduce Balanced line EMI chip
		This is an innovative concept that enables a level of filtering to be achieved using a single component in place of two or more conventional devices.
		In short, Syfer Technology's Balanced Line EMI chip satisfies the need for high speed communications systems using balanced lines or twisted pairs offering low inductance - hence high frequency operation - reduced board space, reduced component count and an unparalleled performance.
		For more information on the Syfer Balanced Line EMI chip, please contact info@anglia.com.
	www.angliac.com /newsarchive/93.asp?article_id=1100 (237 words)

	Balanced Line Driver & Receiver
		With this simple project, you can have balanced lines too, simply adapting the unbalanced inputs and outputs of your hi-fi gear to become balanced, and then back to unbalanced at the other end.
		An unbalanced line is the type you have on the hi-fi, typically using an RCA connector, and feeding the signal through a coaxial cable.
		In contrast, a balanced connection uses two wires for the signal (much like the telephone circuit), with the signal equal in amplitude in each wire, but opposite in phase.
	sound.westhost.com /project51.htm (1870 words)

	Shure / Line Adapter-Converts Balanced Line Level Signals to Microphone level (50dB Attenuation)
		Line adapter provides 50 dB attenuation, allowing a balanced line-level source to be connected to a balanced microphone input.
		This unit has a balanced bridging input with 100 kilohm input impedance and 50 dB loss.
		Use the A15LA to connect high-level line or Aux Outputs to low-impedance microphone inputs.
	www.speechtechnology.com /voicerecognition.cfm?URLID=1482 (215 words)

	MFJ-974H Balanced Line Antenna Tuner (Site not responding. Last check: 2007-10-12)
		The MFJ-974H is a fully balanced wide range T-Network using four gear driven 1000-Volt air variable capacitors and high-Q air wound tapped inductor for 80-10 Meters and separate inductors for 6 and 160 Meters.
		The tuning components are mounted symmetrically to insure electrical balance.
		A 1:1 current balun is placed on the low impedance 50 input side to convert the balanced T-Network to unbalanced operation.
	www.universal-radio.com /catalog/hamtune/2880.html (380 words)

	Ideal transformers aid in balanced-line analysis - 2/15/2001 - EDN (Site not responding. Last check: 2007-10-12)
		One such device, the 180° hybrid combiner, is useful in CAD analysis for verifying the performance of balanced and differential circuits.
		Extensive bandwidth, balanced and equal impedance at all three ports, and infinite isolation provide an excellent circuit block to assist in analyzing differential and balanced circuits.
		The circuit block is borrowed from power-amplifier hybrids where it is useful for signal splitting and combining (Figure 1).
	www.edn.com /article/CA63744.html?1=1 (417 words)

	Articles - Transformer (Site not responding. Last check: 2007-10-12)
		This style of transformer is frequently used as an impedance matching balun to convert from 300 ohm balanced to 75 ohm unbalanced in FM receivers.
		A special type of transformer called a balun is used in radio and audio circuits to convert between balanced circuits and unbalanced transmission lines such as antenna downleads.
		A balanced line is one in which the two conductors (signal and return) have the same impedance to ground: twisted pair and "balanced twin" are examples.
	www.wadso.com /articles/Transformer (5587 words)

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