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Topic: Impedance match

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	Cable impedance
		Characteristic impedance is determined by the size and spacing of the conductors and the type of dielectric used between them.
		For ordinary coaxial cable used at reasonable frequency, the characteristic impedance depends on the dimensions of the inner and outer conductors, and on the characteristics of the dielectric material between the inner and outer conductors.
		In a nut shell the characteristic impedance of a coax cable is the square root of (the per unit length inductance divide by the per unit length capacitance).
	www.epanorama.net /documents/wiring/cable_impedance.html (4237 words)

	Blue Jeans Cable--What is Impedance, Anyway?
		The impedance of the load is expressed in ohms, and the relationship between the current and the voltage in the circuit is controlled by the impedances in the circuit.
		These mismatched impedances redistribute the power in the circuit so that less of it is delivered to the load than the circuit was designed for--because the nature of the circuit is that it can't simply readjust the voltage to deliver the same power regardless of the rate of current flow.
		When we say that the characteristic impedance of a cable is 75 ohms--or 50, 110, 300, or what-have-you--what we mean is that if we attach a load of the specified impedance to the other end of the cable, it will look like a load of that impedance regardless of the length of the cable between.
	www.bluejeanscable.com /articles/impedance.htm (2037 words)

	Loudspeaker Cable Characteristic Impedance
		The characteristic impedance of a cable (Zo) is a complex function of the diameter (or dimensions if other than round) of the conductors, their relative spacing, and the insulation material.
		Matched impedances mean that the source, cable and load impedances are all the same.
		Matched impedances ensure maximum power transfer from source to load, and this is obviously very important for RF transmitters and telephony applications.
	sound.westhost.com /cable-z.htm (5994 words)

	G3YNH info: Impedance matching part 2.
		This matching network saves on the expense of a variable inductor, but it suffers from the same design problem as roller-coaster inductors, which is that of whether or not to short out the unused turns.
		The differential-T match is not amenable to the Match Meter approach because the matching elements cannot be adjusted independently, and so should be adjusted with the aid of an SWR meter.
		From an impedance matching point of view (which we might be inclined to adopt when considering matching networks), the effect of C2 is to cancel the effect of the inductor L to a greater or lesser extent depending on the load impedance.
	www.g3ynh.info /zdocs/z_matcing/part_2.html (5745 words)

	[No title]
		IMPEDANCE Before discussing the design of impedance transformers, it is useful to briefly discuss the nature of impedance and impedance in receiving antennas, since many radio enthusiasts find the concept somewhat slippery.
		Impedance is a force that inhibits the flow of alternating current through a transmission line, transformer, coil, etc. When dealing with DC current flow, the only inhibition to current flow is simple resistance, measured in ohms.
		Impedance in antennas is dependant on their length, height above ground, configuration and often, on the frequency of the signals being received.
	www.dxing.info /equipment/impedance_matching_bryant.doc (8244 words)

	Output Transformer Impedance
		Often times, the primary and secondary impedance information is not available for these units, and it would be nice to have that information to be able to use these in a set that needs a new output transformer.
		The function of the audio output transformer is to transform the high impedance of the output tube to match the much lower impedance of the speaker.
		Notice that the ratio of the primary impedance to the secondary impedance is the square of the turns ratio, or 100:1.
	www.radioremembered.org /outimp.htm (1496 words)

	Antenna Feed-Lines and Impedance Matching
		This tuner is intended to match to match end-fed half-wave vertical and inverted-L antenna wires to low impedance coax lines and transmitters with high power-transfer efficiency...
		Load Z from Input Z Compute Load Impedance from Measured Input Impedance for any Length and Zo The input impedance of an inaccessible radio antenna can by obtained by calculating what it must be to give the impedance measured at the input end of the antenna's feed line...
		Matching Section Impedance-Matching Section of Line Inserted in Antenna Feeder This program assists with design of a class of impedance-matching transformers formed by inserting a short section of line, of different Zo, into the feedline between transmitter and antenna.
	www.smeter.net /feeding/feeding.php (2420 words)

	Speaker Match Impedance (Site not responding. Last check: )
		To match eletcrical impedances engineers use combinations of transformers resistors of the di ameter of the speaker to the wavelength of the sound Speaker Impedance Matching.
		by a speaker depends on the impedance of bth speaker supposed to match impedance is because the most actualpower is produced when the impedance of the speaker and the ENG A uthor quillen Subject Speaker impedance Text How does one measure the impedance w ill not match and its not that important.
		The NOMINAL impedance of a speaker is jst Speaker Impedance Matching.
	sp.knossard.com /speaker-match-impedance.html (374 words)

	Multi-frequency dynamic dummy load and method for testing plasma reactor multi-frequency impedance match networks ... (Site not responding. Last check: )
		Typically, characterization of an impedance match network is performed with a dummy load coupled to the output of the impedance match network in place of the plasma chamber.
		Additional frequency dependent matching networks (not shown) may be similarly tested, with each frequency dependent matching network being separately tested with a separate dummy load corresponding to the particular frequency of the source power in operation for the test.
		The impedance of each reactor is influenced by the chamber configuration, the power delivery mechanism to the plasma, and the frequency dependance of load impedance of the plasma across its process window/windows.
	www.freshpatents.com /Multi-frequency-dynamic-dummy-load-and-method-for-testing-plasma-reactor-multi-frequency-impedance-match-networks-dt20051208ptan20050270118.php (1553 words)

	Radio-telephone interconnection system - Patent 4119800
		The matching circuit connects the receiver portion of the base transceiver to the telephone line as one of the interconnecting paths, and provides an alternate second path between the telephone line and the transmitter portion of the transceiver whereby two-way communication may be effected.
		The impedance match network 48 also includes a pair of output lines 50, 51 which connect network 48 and the matching circuit 12 the audio input of the transmitter portion 16 of transceiver 10.
		As soon as this occurs, audio signals on the telephone line can pass through impedance match network 48 and audio transmit lines 50 and 51 to the audio input to the transmitter portion 16 of transceiver 10, whereby the audio signals are transmitted to the remote transceiver.
	www.freepatentsonline.com /4119800.html (6188 words)

	Shure - Products
		Impedance is how much a device resists the flow of an AC signal, such as audio.
		Impedance is similar to resistance which is how much a device resists the flow of a DC signal.
		Impedance matching reduced the number of vacuum tube amplifiers needed which were expensive, bulky, and heat producing.
	www.shure.com /ProAudio/Products/us_pro_ea_imepdance (364 words)

	Electrical Impedance Mismatch
		When a "transmitter" emits a wave towards a "receiver", the "impedance" (a measure of the dynamic ohms-law relationship between the current and voltage of a source) of the two must match in order to maximize the power transferred from the transmitter to the receiver.
		If the impedance of the receiver does not match the impedance of the transmitter, a portion of the transmitter's energy will be reflected by the receiver and therefore unavailable to it.
		Impedance mismatch is when you have a difference in electrical impedance in the interface between an antenna and its base which causes problem with reflected waves.
	c2.com /cgi/wiki?ElectricalImpedanceMismatch (659 words)

	Rice Audio® Wired Concepts
		Low impedance does not necessarily imply a balanced signal or vice versa although in professional audio balanced signals generally have a low impedance as it is more suitable for driving a longer transmission line.
		Typical high impedance unbalanced signal inputs have an impedance of between 10,000 and 20,000 ohms while typical high impedance outputs are actually either in the mid range or even at a relatively low impedance.
		High impedance unbalanced audio connections are most susceptible to ground fault voltages because the ground or shield is also a part of the signal pair used to carry the signal.
	mywebpages.comcast.net /riceaudio/html/Wired.html (2731 words)

	Impedance (Site not responding. Last check: )
		Impedance is a complex measurement of a device's resistance to the flow of electrical energy.
		Matching impedances does not mean that the output device has the same impedance as the input of the device it is connected but rather that their impedance is set for optimum signal strength and fidelity.
		General rule of thumb is that with modern equipment the output impedance should be low as possible and the input impedance be as high as workable.
	www.sfu.ca /sca/Manuals/ZAAPf/i/impedance.html (468 words)

	iB::Topic::BALUN
		Impedance = 653.1 - J 974.8 ohms for a dipole on 14mhz.
		I had such a set up with a 2mtr yagi array that resulted in the feed point impedance being 200 ohms and a coaxial balun was a great match for this impedance to a 50 ohm line.
		Otherwise you have a need to match at each end of the balanced line; from 50 ohms to the impedance of the line, then back again at the antenna end (unless your balanced line is exactly a half-wavelength).
	www.qrz.com /ib-bin/ikonboard.cgi?s=4fa206360937af461492f95dcae941eb;act=ST;f=5;t=121157;st=0 (3741 words)

	Genesis: Technology: Controlled Impedance Crossovers
		Voice coils can be designed with lower impedances so that only a minimal amount of power is consumed in the voice coil itself, and the greatest amount of power can be directed toward actually moving the speaker diaphragms.
		It is the combination of low moving mass and low impedance that gives Genesis loudspeakers the speed and agility to reproduce the most demanding of sources.
		While theory would indicate that the higher output impedance of tube amplifiers would cause frequency response abnormalities when compared to solid-state amplifiers, we have never found this to be the case.
	www.genesisloudspeakers.com /tech_crossovers.html (651 words)

	Antenna Matching
		Matching a mobile antenna to the requisite 50 ohms is a requirement for several reasons.
		Once the matching device is properly adjusted, the minimum SWR point on your transceiver (or external SWR meter) will be very close to the actual resonance point of the antenna.
		By the way, MFJ offers two sizes of capacitive match boxes; one rated at 300 watts, the other one 600 watts, but both models are stressed at half their power rating.
	www.k0bg.com /match.html (1779 words)

	Agilent Technologies \| Test & Measurement
		Impedance matching is an engineering procedure employed in circuit design for matching unequal source and load impedances.
		Impedance matching is required in order to optimize the power delivered to the load from the source.
		Impedance matching is accomplished by inserting matching networks into a circuit between the source and the load.
	contact.tm.agilent.com /Agilent/tmo/an-95-1/classes/imatch.html (1002 words)

	Unity Gain and Impedance Matching: Strange Bedfellows
		It further discusses how people improperly use one piece of misinformation (impedance matching) to correct for this lack of standardization.
		The new input impedance now becomes essentially the same as the output impedance (100 ohms in parallel with 20k ohms equals 99.5 ohms), therefore matching.
		Impedance matching is not necessary and creates many ills.
	www.rane.com /note124.html (1961 words)

	SWR, impedance and line loss
		Suppose that the load impedance is 150 ohms purely resistive and the transmission line is a length such that the impedance at the input of the line is 30 - j40Ω.
		If the transmitter output power was 100W into a perfectly matched load impedance, then the transmitter's output circuit should be adjusted to provide a net (forward minus reflected) power of 100W by tuning the transmitter output for a conjugate match.
		The conjugate match impedance in this case would be 30 + j40Ω, since the line input impedance is 30 - j40Ω.
	mrtmag.com /mag/radio_swr_impedance_line/index.html (1541 words)

	Circuit Sage: Impedance Matching Tools and Links
		Impedance matching is the lifeblood of RF circuit design.
		The equations used to synthesize the highpass L matching network are discussed in depth.
		Impedance Matching Applied to PAs, A thorough practical discussion of impedance matching from Motorola application note.
	www.circuitsage.com /matching.html (762 words)

	Interpreting Antenna Performance Parameters for EMC Applications - Part 1
		The quality of the input impedance match for an antenna is generally not specified in terms of either reflection coefficient or mismatch efficiency.
		The reason for this is that the balance depends in part on the ratio of the choking impedance of the balun to the antenna's input impedance.
		Input impedance match determines how much incident power is reflected back into the source, while radiation efficiency determines how much incident power is dissipated as heat in the antenna.
	www.djmelectronics.com /articles/emc-antenna-parameters-p1.html (2298 words)

	Sound Equipment \| Resources, Loudspeakers Explained - Speaker Efficiency
		The biggest problem is that a speaker cone forms a very poor impedance match with the air it moves to create the sound.
		Whenever a poor impedance match occurs, energy transfer (in this case from the speaker cone to the air) is also poor.
		Note here that we are talking about impedance match between the speaker and the air, not the electrical impedance relationship between the speaker and the amplifier.
	www.images2.co.uk /Sound_Equipment/resources_loudspeakers_explained_speaker_efficiency.html (742 words)

	Agilent \| Genesys Products - Match Synthesis Module
		Therefore, creating impedance matching networks is one of the most common tasks of the RF engineer.
		Genesys Match then synthesizes one of 8 lumped or distributed topologies for each of the matching networks in between the terminations and devices to achieve the best power transfer over the specified frequency range.
		Because the devices are not unilateral, the matching networks in between the devices will interact, and the mathematics quickly becomes a burden to the engineer.
	eesof.tm.agilent.com /products/genesys/match.html (806 words)

	G4NSJ AERIALS ANTENNA TUNING UNIT MATCH L NETWORK LMATCH BALANCED ATU AMU MATCHING UNIT
		The matching unit doesn’t miraculously change the aerial feed impedance to fifty ohms.
		The AMU transforms the impedance from two-thousand ohms to fifty ohms.
		If the aerial matching unit is good enough to match this impedance then, no, it doesn’t matter.
	www.g4nsj.co.uk /atu.shtml (1050 words)

	It Has Come To My Attention: Impedance matching
		Impedance is the opposition to the flow of energy.
		There are a number of ways you can lift a 500 pound refrigerator by matching the impedance of your muscles to the impedance of the load.
		We put a row of balls in front of it, each one made of a slightly lighter weight material than the last, until the ball nearest us is almost the same mass as the cue ball.
	purefixion.com /2006/04/impedance-matching.html (617 words)

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