
	Where results make sense

Topic: Transmission line

Related Topics

Delta Air Lines

District Line

Northern Line

Piccadilly Line

Red Line

ship of the line

Oder Neisse line

Central Line

Jubilee Line

Metropolitan Line

Bakerloo Line

Blue Lines

In the News (Wed 8 Oct 08)

Breast Cancer

Golden Circle

Keating Five

Stephen Harper

Eli Lilly

Nobel Prize

Eli Manning

Josh Beckett

Sage Rosenfels

South Ossetia

	Circuit Sage: Transmission Line Tools and Links
		Arbitrary Transmission Line Calculator(atlc), a free, open-source UNIX/Linux software for the analysis and synthesis of transmission lines of arbitrary cross section by David Kirkby.
		Transmission Line Effects on Bus, Florida state's applet which graphically shows a wave launch onto a transmission line and it's transient.
		Transient effects on a transmission line at the educators corner.
	www.circuitsage.com /tline.html (857 words)

	RF Transmission Line Loss Calculator / Enhanced
		the VSWR at the midpoint of the line; or
		Transmission lines that use conductors that are not homogenous, eg copper clad steel, silver plated copper clad steel, will not conform to the loss model at low frequencies where the outer layer of the conductor is less than a few skin depths in thickness.
		Transmission line manufacturing tolerances are the most likely cause of the greatest error for new transmission lines, and for those that have been in service, degradation (eg ingress of water, contamination of dielectric, physical distortion, stretching, crushing etc) is a potential further source of significant error.
	www.vk1od.net /tl/tllc.php (1193 words)

	Coaxial Transmission Line \| Mega Industries, LLC.
		Teflon line supports are used in standard coaxial transmission line and rexolite or ceramic supports are available for special applications.
		In addition to straight coaxial transmission line, coaxial components such as 45-and 90-degree miter bends, special angle bends, directional couplers, impedance transformers, impedance matchers, tee junctions, hybrid couplers, phase shifters, attenuators and filters are available to complete your systems.
		EIA coaxial transmission line and Marman-type coaxial straight sections are designed and fabricated to exacting electrical and mechanical specifications.
	www.megaind.com /coaxialTransmissionLine.html (463 words)

	Quarter Wavelength Loudspeaker Design
		The most common example of a loudspeaker that relies on a quarter wavelength acoustic standing wave is a transmission line enclosure.
		In the process, it became clear that the direction my work was headed made it difficult to continue to classify it as strictly transmission line theory and design.
		Anatomy of a Transmission Line Loudspeaker (revised 10/18/06)
	www.quarter-wave.com (727 words)

	Transmission line - The Boston Globe
		We are partial to Audis for three main reasons: their superb all-wheel-drive systems, subtly elegant and ergonomic interiors, and optional continuously variable transmissions.
		Continuously variable transmissions have been around for decades, notably in snowmobiles.
		Using a combination of convex pulleys that open and close and let a chain or belt change its shape with virtually endless variety, it gets the most out of any engine (although really high-powered engines pose a challenge).
	www.boston.com /cars/car_reviews/articles/2007/07/15/transmission_line (588 words)

	Coaxial Transmission Line :: Blocks (RF Blockset)
		The Coaxial Transmission Line block models the coaxial transmission line described in the block dialog box in terms of its frequency-dependent S-parameters.
		Radius of the outer conductor of the coaxial transmission line.
		Radius of the inner conductor of the coaxial transmission line.
	www.mathworks.com /access/helpdesk/help/toolbox/rfblks/coaxialtransmissionline.html (466 words)

	Blythe Energy Project Transmission Line Modifications (Site not responding. Last check: )
		Installation of approximately 67.4 miles of new 230 kilovolt (kV) transmission line between the Buck Substation located adjacent to the BEP and the Julian Hinds Substation located approximately sixty miles to the west.
		Because the path ratings for each of the proposed transmission line components will not be established at the time of Energy Commission review and final decision on Blythe Energy's petition, Blythe Energy is requesting approval of each transmission component path described as part of the project modifications identified herein.
		For most of its length, the Buck to Julian Hinds transmission line component would be located adjacent to the existing SCE D-PV 500 kV line as illustrated in Figure 3.1-2.
	www.energy.ca.gov /sitingcases/blythetline (509 words)

	Transmission Line Easements
		An easement is acquired for access and maintenance of transmission lines.
		This is for both personal safety and the continued safe operation of the line.
		Unobstructed access to the transmission line and its structures shall be available at all times for TransGrid plant and personnel.
	www.transgrid.com.au /Transmission_Line_Easements.htm (320 words)

	Transmission line Summary
		Transmission lines typically feed into lower-voltage distribution lines, which typically have voltage levels less than about 35 kV and an alternating current (in North America) of 60 Hertz (Hz; this is equivalent to 60 cycles of positive to negative per second), and is usually 50 Hz in Europe.
		Electrical fields are generated by transmission lines (and by all electrical appliances), with the strength of the field being a function of the voltage level of the current being carried by the powerline.
		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, such as electromagnetic waves or acoustic waves, as well as electric power transmission.
	www.bookrags.com /Transmission_line (4032 words)

	Transmission lines
		In an electronic transmission line, this is equivalent to holding the voltage at zero for all time by using a short circuit across the line.
		If we replace the right half transmission line with a resistor having resistance equal to the real lossless characteristic impedance of the line, there is no way the waves arriving at the junction can tell the difference between the resistor and the long right-half transmission line it has replaced.
		If we short circuit the line, there is no energy dissipation in the short; the voltage times current across the short is zero; the energy is all reflected as it has to go somewhere; and a return wave is set up having the same size or amplitude as the incident wave.
	www.ee.surrey.ac.uk /Personal/D.Jefferies/transmission.html (4388 words)

	Microwave transmission line of the symmetrical type and with two coplanar conductors - Patent 4871988
		The microwave transmission line as defined in claim 3, wherein a lowest longitudinal resonance frequency of said sub-cavities is greater than the useful frequency band of signals to be transmitted by said line.
		The microwave transmission line as defined in claim 1, wherein the width of a longitudinal interstice extending between said first and second narrow strips and the widths of said first and second narrow strips are much smaller than the width of said cavity.
		The characteristic impedance of the symmetrical line is 50 Ohms.
	www.freepatentsonline.com /4871988.html (2610 words)

	Transmission lines
		For many engineers a transmission line is simply a piece of plumbing that is forgotten until something goes wrong, such as a burned bullet or some idiot with a rifle and a different kind of bullet punctures it.
		Transmission lines for ac and RF are governed by similar laws although the application is generally quite different.
		A transmission line that is not designed to be attenuating, and consists of an odd number of quarter wavelengths has the interesting faculty that an open circuit at the receiving end results in a short circuit at the transmitter and vice versa.
	beradio.com /transmission/radio_transmission_lines (1229 words)

	Large broadband free radiating electromagnetic test cell - Patent 4546358 (Site not responding. Last check: )
		A system as set forth in claim 3 further comprising a tapered transmission line extension at the one end of said transmission line element for connecting to the generating device; and said transmission lines being constructed such that a constant impedance is maintained.
		Bounded-wave structures utilize transmission lines to produce a uniform, high-intensity electromagnetic field environment which is necessarily confined to regions within the transmission line structure.
		A tapered transmission line 6 with constant width-to-height (height is measured from the ground plane 4) ratio maintains the constant transmission line impedance while expanding both the vertical and horizontal area under the transmission line.
	www.freepatentsonline.com /4546358.html (1012 words)

	Re-Engineering The Transmission Line Design Process
		Finally, the seamless integration of all aspects associated with transmission line surveying, engineering, drafting, procurement, and construction is essential to maximize the full benefits of the re-engineering effort.
		This capability allows a full analysis to be made on the transmission line, allowing modifications to be designed on a structure specific basis using the actual loads that are applied to that specific structure at that specific site (See Figure 3).
		Transmission line drawings, while being somewhat complex, are very simple in that they are usually repetitious.
	www.powline.com /pti/ptipaper.html (2965 words)

	FPL \| FPL’s Bobwhite – Manatee Power Line
		At FPL we are planning to construct a new 230-kilovolt transmission line to supply power to central Manatee and Sarasota counties and reinforce the existing transmission system.
		We expect to permit the new line through the process outlined in Florida’s Transmission Line Siting Act, which applies to transmission lines that are designed to operate at 230 kilovolts or more, cross a county line, and are 15 miles or more in length.
		Placing transmission lines underground can also be a very invasive process, where driveways, sidewalks, fences, landscaping, sprinkler systems and yards may need to be torn up, and access to homes and businesses can be impacted for extended periods of time.
	www.fpl.com /environment/lines/bobwhite.shtml (947 words)

	TRANSMISSION LINES: why 600V?
		Transmission lines differ from simple electrical networks in that their inductance, capacitance, and resistance are not lumped but are distributed over distances such that the time required for electrical energy to travel from one part to another has to be taken into account.
		Because propagation time through 20 miles of line is significant even at voice frequencies, equipment at each end had to match the line impedance to avoid severe frequency-response errors because of reflections and standing waves.
		Interference, mostly from the AC power lines frequently running parallel to the phone lines for miles, was largely eliminated through balanced operation of the lines.
	svconline.com /mag/avinstall_transmission_lines_why/index.html (851 words)

	A Transmission Line is Always a Transmission Line
		This sequence corresponds precisely to the behavior of an electrical source, a transmission line, and its load-provided that the delay of the line exceeds the rise (or fall) time of the source.
		The input impedance of a long transmission line, in the brief interval of time before the echo returns, depends only on the characteristics of the line itself, not the load.
		When the line is short, these two modes of propagation still exist, only their temporal superposition creates the illusion of a direct connection between source and load.
	www.sigcon.com /Pubs/edn/TransmissionLine.htm (698 words)

	Pickup apparatus for capacitive video disc players with transmission line tuned circuit (US3872240)
		The transmission line is capacity end loaded at the arm end remote from the stylus by a series combination of capacitances which include an air dielectric capacitor and a voltage variable capacitor.
		The transmission line and associated capacitances form a tuned circuit with a resonant frequency subject to variation as the stylus-disc capacitance varies.
		A tuning control circuit responsive to the detector output adjusts the voltage variable capacitance to maintain a desired spacing between the oscillator output and the tuning range of the transmission line resonant circuit.
	www.delphion.com /details?pn=US03872240__ (481 words)

	transmission line paramaters
		When modeling an electric power transmission line it is useful to use per phase analysis rather than trying to model all three phases at once.
		If an AC signal is injected at one end of a transmission line, and the signal is then observed at a distance away from the injection point, it will be apparent that as the distance from the injection point increases, the voltage waveform will begin to lead the current.
		For short lines, the effect of the shunt admittance is usually too small to be of much consequence, so it is often ignored.
	www.ee.washington.edu /energy/apt/nsf/previous/transline1.htm (722 words)

	Upgrading Transmission Capacity for Wholesale Electric Power Trade
		The actual temperatures occurring in the transmission line equipment depend on the current, that is the rate of flow of the electrons, and also on ambient weather conditions, such as temperature, wind speed, and wind direction, because the weather effects the dissipation of the heat into the air.
		(5) The line reactance increases with the length of the line.
		Since the thermal limit of a transmission line is based on the component that would be the first to overheat, a substantial increase in the overall thermal rating of the line can sometimes result from replacing an inexpensive element.
	www.eia.doe.gov /cneaf/pubs_html/feat_trans_capacity/w_sale.html (5896 words)

	Agilent \| Wave Propagation along a Transmission Line
		When a sine wave from an RF signal generator is placed on a transmission line, the signal propagates toward the load.
		At any point along the transmission line, that signal also appears to be a constant voltage whose phase is dependent upon physical position along the line.
		Again, the difference is shown by the green line, which indicates the amplitude at that point on the transmission line.
	education.tm.agilent.com /index.cgi?CONTENT_ID=6 (575 words)

	JS Online: Residents decry transmission line
		American Transmission is proposing to build the line to help address Wisconsin's lack of high voltage lines that can bring power in from other states and relieve congestion on the only such line that links the state to Minnesota.
		Transmission lines - and the need to update the state's power grid - are in the public eye after the Aug. 14 flout that left 50 million people without power from Michigan to New York.
		American Transmission representatives say that they remain confident that the Wausau-to-Duluth line is the best solution, and that to begin planning an alternate line would push the opening of a new line back by several years.
	www.jsonline.com /bym/news/oct03/174111.asp (732 words)

	IEEE History Center: Shoshone Transmission Line
		This power line was a pioneering achievement because of its 150-mile length, the mountainous country it traversed, and the extreme weather conditions under which it operated.
		The third network of electric lines, power transmission lines, owe their spread to the successful development of quite a number of devices, notably dynamos, electric lights, electric motors, and transformers.
		Each of them grew from a single line to a dense web connecting all urban areas in a period of about 40 years: for the telegraph, from the 1840s to the 1880s; for the telephone and for power transmission, from the 1880s to the 1920s.
	www.ieee.org /web/aboutus/history_center/shoshone.html (886 words)

	Transmission Line Theory
		While most engineers familiar with transmission lines understand two-conductor transmission lines are fed differentially at one end by a source and have a termination placed differentially across the far end, a few seem to disagree.
		This occurs because energy in a two-conductor transmission line is transferred via TEM mode; fields are confined to the general area between the conductors.
		The key to having a line behave like a transmission line is feeding it differentially at one end, and not applying voltage across the length of one or both conductors.
	www.w8ji.com /transmission_line_theory.htm (1111 words)

	hifi/stereo - micro transmission line speaker system
		Then the driver has been mated to a critically damped transmission line which does not raise the system resonance to a higher frequency, as would be the case with a sealed or ported enclosure.
		The cross-sectional area of the transmission line is substantially as large as the driver's piston area, thereby avoiding the "air-stiffening" action of the sealed or ported enclosures which raises their resonance frequencies.
		The transmission line is a long folded passageway designed to be 1/4-wavelength long at the free air resonance frequency of the driver, so that the acoustical output radiated from the line opening mixes with the front-wave from the driver, to cause partial cancellation of the signal, only at the resonance frequency.
	www.warrengregoire.com /hifi-stereo-microtls.htm (1268 words)

Try your search on: Qwika (all wikis)