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	Ground loop - Wikipedia, the free encyclopedia
		In electrical engineering and electronics, a ground loop refers to an unwanted current that flows in a conductor connecting two points that are nominally at the same potential, for example ground potential, but are actually at different potentials.
		In aviation circles, the term ground loop refers to the rapid circular rotation of an aircraft in the horizontal plane whilst on the ground.
		Ground loops are common with taildraggers, as the Center of Gravity is behind the main undercarriage.
	en.wikipedia.org /wiki/Ground_loop (154 words)

	Ground loop (aviation) -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-08-08)
		In (The aggregation of a country's military aircraft) aviation, ground loop is the rapid circular (The act of rotating as if on an axis) rotation of an aircraft in the (Something that is oriented horizontally) horizontal (A carpenter's hand tool with an adjustable blade for smoothing or shaping wood) plane whilst on the ground.
		When ground loop occurs, it is usually in the context of an aircraft moving under its own power - either (Click link for more info and facts about taxying) taxying, (The act of coming down to the earth (or other surface)) landing or during (A departure; especially of airplanes) takeoff.
		Ground loop can cause extreme damage to the (Framework that serves as a support for the body of a vehicle) undercarriage and (Click link for more info and facts about wingtips) wingtips of an aircraft.
	www.absoluteastronomy.com /encyclopedia/g/gr/ground_loop_(aviation).htm (235 words)

	Solving Ground Loop Problems
		A ground loop is an electrical problem that happens when an AC current interferes with the ground reference level of the video signal.
		Ground loops are an after-the-fact type of problem in which the end-user blames the installer, the installer blames the manufacturer, and actually nobody is at fault.
		A ground loop problem may occur at several points in the system, and each occurrence of the problem must be corrected individually.
	www.pelco.com /support/videosecbasics/groundloops.aspx (480 words)

	Ground Zero ground loop elimination system by Granite Audio. Listen to your music, not your hum.
		GROUND ZERO is an affordable totally passive star grounding system that equalizes the ground impedance path of every component in your audio or video system regardless of the condition of your house wiring and regardless of how many different gauges of power cords you are using.
		Ground loop problems generally begin when there is a difference in the ground potentials of the various components in a system.
		The ground potential of one component may be higher or lower than that of another connected component and the component's ground path to earth ground, or ground impedance, may be higher or lower than that of the other connected component.
	www.graniteaudio.com /zero (1333 words)

	Ground loop basics
		Ground loop is a common wiring conditions where a ground current may take more than one path to return to the grounding electrode at the SERVICE PANEL.
		A ground loop in the power or video signal occurs when some components in the same system are receiving its power from a different ground than other components, or the ground potential between two pieces of equipment is not identical.
		Typical indication of the ground loop problem is audible 50 Hz or 60 Hz (depends on mains voltage frequency used in your country) noise in sound.
	www.epanorama.net /documents/groundloop/basics.html (1424 words)

	Ground loop problems and how to get rid of them
		Ground loop is a condition where an unintended connection to ground is made through an interfering electrical conductor.
		Ground loop is a common problem when connecting multiple audio-visual system components together, there is a good change of making a nasty ground loops.
		Ground loop interference problem is a consequence of this.
	www.epanorama.net /documents/groundloop (2426 words)

	Ground Loop: Recommendations
		Ground Loop can help you find out which features are hype and which are practical advantages for your individual needs.
		Ground Loop uses detailed information about your home as well as their experience to recommend the right type of unit and loops for your home.
		Ground Loop is IGSHPA certified as well as a member of the Geothermal Heat Pump Consortium (GHPC).
	www.groundloop.com /recommend.htm (777 words)

	Solving instrumentation ground loop problems
		The cabinet ground is a safety ground that protects equipment and personnel from accidental shock hazards while providing a direct drain line for any static charges or electromagnetic interference (EMI) that may affect the cabinets.
		This cabinet ground remains separate from the DC signal ground until it terminates at the master ground bus.
		When ground loops can't be eliminated, the solution to instrumentation ground loops lies in the use of signal isolators, as shown in Fig.
	ecmweb.com /mag/electric_solving_instrumentation_ground_2 (903 words)

	What is a Ground Loop and why should I care?
		Since the A.C. power system is connected to earth ground (mandatory since the early 1900s per the National Electrical Code® - the NEC), and since the cable system as it enters your house is also required by the selfsame NEC to have its outer conductor connected to earth ground, a ground loop is formed.
		Disconnecting the cable ground where it enters the house often cures (or helps cure) the ground loop(s) and the stuff is still grounded via the A.C. cords, yet the cable company will absolutely disown you, this too violates the NEC (Article 820 section 33, 1996 edition), and there is a risk of greater lightning damage.
		Ground loops were a problem both in stereo repair and especially in broadcast engineering.
	www.siber-sonic.com /electronics/GLoopwhatis.html (1093 words)

	Ground Loops, or 'Let Me Hum A Few Bars' [SMR] (Site not responding. Last check: 2007-08-08)
		Simply put, "ground loop" is a condition where all your electrical "grounds" aren't at the same electrical potential, namely zero volts AC and DC.
		Since we know ground loop is caused by differing ground connection potentials, let's deal first with "breaking" that ground connection at the "source" without losing the cable TV signal feed and required signal return back to the cable company.
		The subject of Ground Loops, and other sources of noise in A/V gear, as well as their reduction/elimination is not an "exact science".
	smr-home-theatre.org /Ground-Loops (3577 words)

	TSC Tech Talk \| Grounding
		As a consequence of ground loop induced voltages, the ground reference in the system is no longer a stable potential, so signals ride on the noise.The noise becomes part of the program signal.
		The AC power cord ground (the green wire and the third pin on the AC plug) connects the chassis of electronic equipment to a wire in the wall power service that leads to an earth ground.
		One way to break this ground loop is to lift the AC ground on one piece of equipment, typically the power amplifier.
	www.trinitysoundcompany.com /grounding.html (1024 words)

	Ground Loop Isolators
		The physical connection of the two devices causes electrical ground paths to be formed between the devices, and between each device and the bike's electrical ground.
		Also, ground loops will generally be present whether or not the engine is running - if you're getting noise only when the engine is running, you probably have alternator or spark-plug noise and not a ground loop.
		Ground Loop Isolator with 48" leads and 3.5mm stereo plugs (use for Harley Ultra, Honda Valkyrie Interstate, Autocom, and other applications).
	www.cyclegadgets.com /Products/product.asp?Item=GLI (442 words)

	Geothermal ground loop installation. Photos at our energy efficient home in Deep Creek Lake, MD
		Since the loop pipes were fed through the wall in pairs (inlet followed by outlet) all the odd pipes were connected to form an inlet manifold (lower pipe) and all the even pipes were joined to form an outlet manifold.
		The truck in the foreground was fitted with a lifting boom, and the truck in the background was used for mixing and pumping the "grout" that is used to fill the holes after the tubing is installed.
		This is the only join in each ground loop, since each length of tubing runs from the bottom of the well, up to the surface, along a ground trench and into the utility room through a hole in the concrete retaining wall.
	www.ourcoolhouse.com /images/construction/groundloop.htm (1051 words)

	Ground Loop - MP3Car.com Forums
		I wired the grounds for the amp and the inverter to a single chassis point, and I ended up shortening the chassis ground connection to about 4 inches, but it didn't even change in intensity, much less go away.
		I'd like to avoid using a ground loop isolater if possible, but I know I'm going to keep the inverter setup, so that might be the only solution.
		Grounded the PSU to the chassis and disconnected the signal ground and it completely removed the ground loop.
	www.mp3car.com /vbulletin/showthread.php?t=23189 (311 words)

	Definition: ground loop (Site not responding. Last check: 2007-08-08)
		ground loop: In an electrical system, an unwanted current that flows in a conductor connecting two points that are nominally at the same potential, i.e., ground, but are actually at different potentials.
		Note 2: A ground loop can also exist in a floating ground system, i.e., one not connected to an Earth ground, if the conductors that constitute the ground system have a relatively high resistance, or have, flowing through them, high currents that produce a significant voltage ("I•R") drop.
		Note 3: Ground loops can be detrimental to the operation of the electrical system.
	www.its.bldrdoc.gov /fs-1037/dir-017/_2498.htm (159 words)

	Ground Loop
		It seems that ground loops carry some mystical connotation to the point that our industry has made it a “catch all” culprit for anything that cannot be explained.
		While ground loops can be complex problems and may not always be predictable they can be understood and dealt with if we have a little insight into just what they are and how they can affect a transmitted signal.
		Since the earth presents itself as a resistor between these two ground points the amount of current that flows between the points will be directly proportional to the voltage difference and inversely proportional to the resistance.
	www.wici.com /technical_info/articles/gnd_loop/gnd_loop.htm (684 words)

	Ground Loops - Eliminating System Hum and Buzz
		These devices are meant to provide a safety ground (via the cover plate screw to a grounded outlet) in the event a three prong plug is used with a two prong outlet.
		If the related equipment is properly grounded, simply lifting signal ground between equipment, may cause enormous amounts of humming and potentially damage the input amplifier of the receiving equipment because of the flowing stray currents on the ungrounded equipment.
		One of the most widely popular methods of eliminating ground loops is to take a 75-ohm to 300-ohm converter, connected to a second matching transformer with two screw terminals on the 300 ohm side, and putting it inline with your cable TV feed.
	www.audioholics.com /techtips/setup/avhardware/groundloopcableTV.php (1659 words)

	Ground Problems
		In other words, the ground wire is near zero impedance at the ground end, but due to the impedance inverting characteristic, the station equipment 'sees' a very high impedance at the equipment end of the ground wire.
		Driving a ground rod into the ground and running a 25 or 30 foot hunk of ground wire, no matter how heavy gauge the wire, it is just not going to work.
		Solving the ground loop problem may be as simple as adding 'Line Isolators' in series with the interconnecting coaxial cables between station equipment.
	www.radioworks.com /nbgnd.html (4726 words)

	Ground Loop (Site not responding. Last check: 2007-08-08)
		A ground loop is an uncontrolled turn during ground operation that may occur while taxiing or taking off, but especially during the after landing roll.
		Careless use of the rudder, an uneven ground surface, or a soft spot that retards one main wheel of the airplane may also cause a swerve.
		As explained in the chapter on Landing Approaches, due to the characteristics of an airplane equipped with a tailwheel, the forces that cause a ground loop increase as the swerve increases.
	www.faatest.com /books/FLT/Chapter10/GroundLoop.htm (396 words)

	Geothermal Heat Pumps, Source Heat, Ground Loop Technology, Water Source Heat Pump, Ground Coupled Heat, GeoExchange, ...
		The terms "geothermal", "ground source" and "GeoExchange" are used interchangeably with reference to heating and cooling systems that use the earth as a heat source and heat sink.
		Ground source heating and cooling is a high-comfort, cost-effective, and environmentally friendly technology that takes advantage of the Earth's capacity to store energy in the form of heat.
		The ground loop consists of a piping system circulating a water/antifreeze mixture from the earth to the geothermal heat pump and back.
	www.soundgt.com (595 words)

	Solving Instrumentation Ground Loop Problems
		In layman's terms, a ground loop develops because each ground is tied to a different earth potential.
		To minimize the danger of introducing these loops into a complicated network, you should use a dedicated instrumentation system ground bus and connect grounds from the signal common, cabinet ground, and instrumentation AC power ground to it.
		The cabinet ground is a safety ground that protects equipment and personnel from accidental shock hazards.
	ecmweb.com /mag/electric_solving_instrumentation_ground/index.html (953 words)

	Audio Ground Loop Isolation Transformers
		These problems usually exist at the output of an electronic device that is connected to another electronic device in such a way as to create a ground loop where common mode or EMI current can flow.
		Hum in audio or video systems is usually the result of a ground loop in the system like the one shown in Figure #1.
		Common mode current will flow in a ground loop created by an electrical system that has grounds at different voltage potentials.
	www.allenavionics.com /AVI_Trans/AGL.htm (377 words)

	diyAudio Forums Archive - Ground loop hum
		It's definitely a ground loop, and not a problem with the ground wiring within the amp itself, since the hum only appears when connected to the preamp.
		The ground is bonded to the neutral bus in your breaker panel, so if the ground wiring has a problem, and a potential develops between ground and neutral at your outlet, it can cause the hum.
		I had a strange ground loop problem once that was resolved by disconnecting the cable TV from my tuner.
	www.diyaudio.com /forums/showthread/t-7901.html (1626 words)

	Ground Loop
		In the heating mode, an exchange is made between the liquid warmed by the constant earth temperature and freon in the evaporator.
		For a typical horizontal ground loop system, a network of trenches five feet deep is cut by a trencher or backhoe and high density polyethylene or polybutylene pipes are laid horizontally.
		In a vertical ground loop system, multiple bore holes are drilled at least 10 feet apart and from 125 to 200 feet deep.
	www.kepco.org /rebates/heatpumps/groundloop.html (200 words)

	Avoiding Ground Loop Hum (Site not responding. Last check: 2007-08-08)
		The grounds between sound hardware 'boxes' are established by the AC outlets, and through signal cables.
		Depending on the circuit configuration of the audio hardware, the audio signal impedance and the impedance of the signal cable ground, the currents may cause induced voltages in the audio circuitry.
		Balanced signal connections, found in professional audio hardware and scientific instrumentation, are much less susceptible to ground loop (and other noise pickup) problems, because signals are transmitted and amplified differentially.
	www.channld.com /hum.html (420 words)

	Xitel - Precision Audio Technology (Site not responding. Last check: 2007-08-08)
		The most likely cause of humming in audio equipment is due to a ground loop in your home or apartment mains power wiring.
		A ground loop occurs through differences in resistance in the electrical system.
		Xitel’s ground loop isolator has been fully designed, built and tested to exacting standards for high fidelity audio applications.
	www.xitel.com /product_gli.htm (205 words)

	horizontal ground loop
		A type of closed-loop geothermal heat pump system in which the fluid-filled plastic heat exchanger pipes are laid out in a plane parallel to the ground surface.
		The most common layouts either use two pipes, one buried at six feet, and the other at four feet, or two pipes placed side-by-side at five feet in the ground in a two-foot wide trench.
		Horizontal ground loops are generally most cost-effective for residential installations, particularly for new construction where sufficient land is available.
	daviddarling.info /encyclopedia/H/AE_horizontal_ground_loop.html (169 words)

	DriverHeaven.net - View Single Post - Ground Loop Problem Solving
		Typican ground loop humming problem occurs when you connect your computer sound card to a stereo receiver which is connected to wall antenna plug.
		The computer is connected to grounded power outlet which causes that the sound card audio ground is connected to mains ground.
		The mains ground and antenna are tied together (ar at least should have) somewhere else in the house.
	www.driverheaven.net /showpost.php?p=77680&postcount=1 (180 words)

	ground loop
		An undesirable feedback condition caused by two or more circuits sharing a common electrical line, usually a grounded conductor.
		In a geothermal heat pump system, a series of fluid-filled plastic pipes buried in the shallow ground, or placed in a body of water, near a building.
		The fluid within the pipes is used to transfer heat between the building and the shallow ground (or water) in order to heat and cool the building.
	www.daviddarling.info /encyclopedia/G/AE_ground_loop.html (152 words)

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