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Topic: Barrage jamming

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	Barrage jamming
		Barrage jamming: Jamming accomplished by transmitting a band of frequencies that is large with respect to the bandwidth of a single emitter.
		Note: Barrage jamming may be accomplished by presetting multiple jammers on adjacent frequencies or by using a single wideband[?] transmitter.
		Barrage jamming makes it possible to jam emitters on different frequencies simultaneously and reduces the need for operator assistance or complex control equipment.
	www.ebroadcast.com.au /lookup/encyclopedia/ba/Barrage_jamming.html (100 words)

	Encyclopedia: Jamming
		Jamming was the name of a late 1970s to early 1980s UK music fanzine edited by Tony Fletcher.
		Jamming (or jam session) - a term used to refer to an informal, semi-improvised performance by a group of rock or jazz musicians.
		Radar jamming is the intentional emission of radio frequency signals to interfere with the operation of a radar by saturating its receiver with false information.
	www.nationmaster.com /encyclopedia/Jamming (701 words)

	NSNL 3 - Worldwide Jam Session (Site not responding. Last check: 2007-09-29)
		The purpose of all jamming is to interfere with the enemy's effective use of the electromagnetic spectrum.
		Jamming is sometimes called "soft kill" because it temporarily makes an enemy asset ineffective but does not destroy it.
		When the jamming noise is significantly higher than the receiver's thermal noise, we speak of the jamming-to-signal (J/S) ratio rather than the SNR, but the effect on signal reception and processing is the same.
	www.cvni.net /radio/nsnl/nsnl3jam.html (3454 words)

	Electronic counter-counter-measures - Wikipedia, the free encyclopedia
		Radar jamming can be effective from directions other than the direction the radar antenna is currently aimed.
		When jamming is strong enough, the radar receiver can detect it from a relatively low gain sidelobe.
		This method is also useful against barrage jamming, in that it forces the jammer to spread it's jamming power across multiple frequencies in the jammed system's frequency range, reducing its power in the actual frequency used by the radar at any one time.
	en.wikipedia.org /wiki/Electronic_counter-counter-measures (524 words)

	Jamming (Site not responding. Last check: 2007-09-29)
		The purpose of this type of jamming is to block out reception of transmitted signals and to cause a nuisance to the receiving operator.
		Radar jamming for the purposes of defeating speed detection radar is simpler than for military application, although it is often illegal.
		Jamming (or jam session) is also a term used to refer to an informal, semi-improvised performance by a group of rock or jazz musicians.
	www.yotor.com /wiki/en/ja/Jamming.htm (666 words)

	Autoduel Quarterly: Electronic Warfare
		There are two types of radio jamming: broad spectrum, or "barrage" jamming, which interferes with all signals in a certain area (even friendly ones), and narrow beam, or "point" jamming which only affects the other guy's signals.
		Barrage jamming is most effective against those who don't have EW equipment of their own, and it has the advantage of simplicity; just flick a switch and let 'er rip.
		Once the target of a point jam burns through the interference, the jamming equipment must be recalibrated, a process which requires five seconds, during which the EW systems operator may do nothing else.
	www.sjgames.com /car-wars/adq/7/1/warfare.html (2337 words)

	MilSpec Communications: Tactical Radio Jammers
		Jamming is accomplished by transmitting a strong signal on the same frequency as that used for communications.
		A jamming signal me be intended to block a single frequency --- called spot jamming, or, to block a band of frequencies --- called barrage jamming.
		This new breed of equipment is capable of employing such techniques as wide-band rf spectrum transmitters, and various audio tones to jam or to spoof receiving equipment and their operators.
	www.milspec.ca /jammers/jammers.html (500 words)

	CHAPTER 3 (FM 24-33)
		Barrage jamming is power spread over several frequencies or channels at the same time.
		The signal-to-jamming ratio is the relative strength of the desired signal to the jamming signal at the receiver.
		Jamming refers to the hostile or unidentified interference being received.
	www.fas.org /irp/doddir/army/fm24-33/fm243_4.htm (2378 words)

	Mountain Top Radar Data (Second Dataset)
		The jamming was not coherent with the radar.
		Jamming signal was pseudo-random noise with a bandwidth of 600 kHz: this signal is broadband relative to the radar's bandwidth, so it appears as broadband barrage jamming.
		The jamming data may be scaled to adjust its relative power level, and a linear phase progression may be applied to the element dimension to change the apparent direction of the jammer.
	spib.rice.edu /spib/mtn_top.html (2076 words)

	BARRAGE BALLOONS (Site not responding. Last check: 2007-09-29)
		Possibly the most ominous aspect of the barrage balloon--at least in the mind of the attacking pilot--is the physical and psychological hazard the cable presents to him and his aircraft.
		Barrage balloons were developed in World War I to counter one of the most advanced technological threats of the time--the airplane.
		In conjunction with other arms, barrage balloons constitute an element in the antiaircraft defense system complementary to antiaircraft artillery and pursuit aviation, the balloons being most effective at low altitudes where the complementary arms are least efficient.
	www.airpower.maxwell.af.mil /airchronicles/apj/apj89/hillson.html (5130 words)

	SINCGARS-V
		To be successful in this limited form of jamming, a jammer frequency must be on one of the frequencies included in the hopset and the jammer must have sufficient power to overcome the hopping signal.6 Attempts to change the jammer frequency require a great deal of time relative to the hopping of the target system.
		By jamming across entire bands of the electromagnetic spectrum, these jammers can effectively block all the possible frequencies that could be employed by a hopping radio.
		In fact, jamming may be the least difficult to solve when compared to having to analyze which of several radios that are using hundreds of fre- quencies may be producing the particular interference.
	www.globalsecurity.org /military/library/report/1985/WGE.htm (9992 words)

	Alexander C. Dale, Countering Hate Messages That Lead to Violence: The United Nations's Chapter VII Authority to Use ... (Site not responding. Last check: 2007-09-29)
		Radio jamming is defined as "the deliberate emission of electromagnetic (EM) radiation to reduce or prevent hostile use of a portion of the EM spectrum."
		Barrage jamming would prevent hostile broadcasters from frequency hopping and would allow for the simultaneous jamming of several transmitters.
		The jamming could be done from an outpost inside Rwanda, from a position in a neighboring country, or from a mobile unit either in the air or on land.
	www.law.duke.edu /journals/djcil/articles/djcil11p109.htm (9064 words)

	EW Tutorial Part 4
		Barrage jamming may consist of broadband noise, narrow band noise, discrete frequencies or repeater radiations.
		Since the jamming transmitter power output is generally greater than the normal return echo of a radar system prior to burnthough, the intruder's presence may be known prior to the time of radar detection.
		Should the system or systems operator detect jamming or a jamming intent, the operational mode may be changed to track or home on the center of jammer-radiated power.
	ourworld.compuserve.com /homepages/edperry/ewtutor4.htm (3858 words)

	E O O B Part 2
		Supported by the EC-130s' jamming of all known communications frequencies, the solid wall of electromagnetic garbage hid multiple waves of inbound strike aircraft and cruise missiles, while paralysing much of Iraq's communications network.
		While SEAD and jamming aircraft continued to escort Allied strike packages throughout the campaign, the number of missile launches and radar activity dwindled with ongoing time as attrition took its toll, and Iraqi SAM and radar operators refused to light up their radars for fear of being hit.
		A typical tactic used was to coordinate the run-in by the F-117A with barrage noise jamming by an EF-111A or EA-6B, this causing a reduction in the victim radar receiver's sensitivity to the point, where the otherwise detectable F-117A vanished from the screen (Neville Dawson).
	www.wonderland.org.nz /nw/eoobpart_2.html (2505 words)

	36th Bomb Squadron Home Page-Missions- D-Day
		The MANDREL barrage jamming by design would form a screen behind which Allied aircraft could operate unseen.
		Because of new long range German radar installations located on the westerly tip of the Cherbourg Peninsula, plus a number of coast watchers in the Channel Islands area, twenty MANDREL equipped aircraft were necessary for the barrage jamming operations.
		All of the jamming aircraft were to conduct their special operations for 5 1/4 hours.
	www.36rcm.com /missions/dday/missions.htm (293 words)

	Radar Glossary
		Inverse SAR (ISAR) is a variation on the SAR theme that uses the motion of the target relative to the radar to the same effect.
		aims to degrade the operation of a radio receiver by transmitting a jamming signal that is received at higher power than other signals, and hopefully prevents them from being received at all.
		determines the direction of the jamming signal and effectively steers a null into that direction to zero out the jamming signal.
	www.argospress.com /Resources/radar (1368 words)

	Type 85 air defence search radar
		To improve the jamming resistance of the Type 85 the 4 x 60 Mhz bands for which klystrons were provided were split into parts of equal power and recombined with half the power from another band, e.g.
		In normal, non jamming conditions, only four transmitters were used - one A band in use with one as standby and one B band in use with one as standby.
		For still greater concentration of transmitter power at a target under jamming conditions the aerial could be used in sector scan mode where it would rotate back and forth between two azimuth angles.
	www.radarpages.co.uk /mob/linesman/type85.htm (1207 words)

	Culture Jamming 101 -- Truth is a Virus
		At its height in '93 WAC had 300 women coming to weekly meetings (in New York alone), a furious barrage of actions and press coverage, and copy-cat chapters around the world, but by '95 it had folded.
		While ELF and other political activists have adapted viral structures to grow their resistance movements, media activists have pioneered a new form of hand to hand viral combat: culture jamming.
		If culture jamming works as a "meme vaccine," the website www.posternation.org, begun by Wesleyan art students in the mid 90's and later handed over to United for a Fair Economy, was designed as a "viral engine." The principle, "Nationwide Saturation Postering," is deceptively simple.
	www.culturejamming101.com /truthisavirus.html (4057 words)

	Satellite TV said to be jammed - The Washington Times: World (Site not responding. Last check: 2007-09-29)
		BEIRUT — Iran's cleric-run government is being accused of jamming U.S.-supported satellite TV channels, blaming them for inciting the wave of student-led protests that have brought bloody clashes to Tehran's streets.
		Although it has long been illegal to buy or install satellite dishes, the devices cling to the sides of practically every building in the middle-class northern Tehran suburbs and are a common sight across town.
		Large circular white boxes installed in the grounds of government barracks and bases are believed to be jamming devices.
	www.washtimes.com /world/20030615-121436-7069r.htm (447 words)

	jam --> Definition from aiedu.com
		hyponym: barrage jam point jam spot jam blanket jam
		Synonyms: jam, jampack, ram, chock up, cram, wad
		Synonyms: obstruct, obturate, impede, occlude, jam, block, close up
	www.aiedu.com /word/jam (416 words)

	Glossary (Site not responding. Last check: 2007-09-29)
		Airborne radar jamming device operating in the 85-135 MHz waeband to conter the Freya early warning system.
		German name for the glow in the sky from searchlights, flares and fires against which the bombers were silhouetted.
		Radio jamming device used by RAF to deceive the Freya radars by returning their own signal in an amplified form giving the impression of a larger force that in fact existed.
	www.stable.demon.co.uk /general/glossary.htm (1473 words)

	W3Dictionary.com - Online Dictionary - Definition of JAM (Site not responding. Last check: 2007-09-29)
		block, block, chock up, close up, cram, cram, crush, crush, electronic jamming, fill, fill up, fix, hole, impede, jamming, jampack, kettle of fish, mess, mob, muddle, obstruct, obturate, occlude, pack, pack, pickle, pile, press, ram, stuff, throng, wad
		To crush or bruise; as, to jam a finger in the crack of a
		pressure from a crowd; a crush; as, a jam in a street; a
	www.w3dictionary.com /jam (243 words)

	Common Glossary of RADAR Terms (Site not responding. Last check: 2007-09-29)
		The range at which the strength of the radar echoes becomes greater than that of the ECM jamming signal.
		The amplitude comparator circuits deliver to each channel those signals with an amplitude proportional to the difference of the gain of the two chains comprising each channel; this amplitude determines the elevation of the target.
		Because of its CFAR characteristics, it is invaluable in a barrage jamming environment.
	www.rades.hill.af.mil /glossarymain.html (4893 words)

	Radar Jammer (Site not responding. Last check: 2007-09-29)
		is a type of jammer designed specifically designed to jam radar receivers.
		Jamming techniques commonly employed by a radar jammer
		The use of such devices is illegal in many places; even possession is sometimes illegal.
	www.argospress.com /Resources/radar/radarjamm.htm (195 words)

	Barrage Jamming (Site not responding. Last check: 2007-09-29)
		The barrage jammer must spread its power over a very wide band, which reduces the jammer power in any one particular band.
		This is quite different from the spot or sweep jammers whose entire transmitted power is concentrated in a relatively narrow bandwidth.
		Not only is the barrage jammer's power spread over a wide bandwidth, it may be wasted if there are no radars operating in part of its band.
	www.argospress.com /Resources/radar/barragyjammi.htm (206 words)

	Beverage Oral History
		So that they in trying to cut into transatlantic cables, they were trying to get ready to jam the New Brunswick Station, which would break off all communications between Washington and the Expeditionary Forces in France, which would really be a disaster.
		Because the Navy themselves had our transmitter NAA in Washington, but it was not nearly as strong a signal as the one from New Brunswick, the alternator.
		The barrage receiver was an idea to set up on the [unintelligible passage] France and Germany, to set up a jamming transmitter.
	www.ieee.org /organizations/history_center/oral_histories/transcripts/beverage138.html (4551 words)

	barrage - OneLook Dictionary Search
		BARRAGE : Navajo Code Talkers' Dictionary [home, info]
		Phrases that include barrage: barrage balloon, barrage jamming, barrage fire, balloon barrage, barrage jam, more...
		Words similar to barrage: barraged, barraging, battery, bombardment, onslaught, outpouring, shelling, barrage fire, more...
	www.onelook.com /?w=barrage (266 words)

	jamming - OneLook Dictionary Search
		Jamming : Online Plain Text English Dictionary [home, info]
		Phrases that include jamming: barrage jamming, spot jamming, electronic jamming, selective jamming, culture jamming, more...
		Words similar to jamming: jam, electronic jamming, more...
	www.onelook.com /?w=jamming&ls=a (181 words)

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