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100:. When a target was not on the sensor's centerline, it would produce a pulse as the reticle swept over the target. When the target was on the sensor's centerline, the sensor would produce a constant signal. This constant signal was required by the early missiles to produce a "lock on" that would allow a launch.
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The ALQ-144 and 147 IRCM produced a pattern of pulses that was approximately synchronized with the rotation rate of these reticles. Before launch this would prevent the missile actually locking onto the target, preventing the operator from firing the missile. After launch this would cause the missile
76:, each flare was only effective for a short period. If an aircraft needed to loiter over a high risk area or was flying slowly (as helicopters do), it would require a large number of flares to decoy any missile fired at it. The IRCM provided constant protection against infra-red guided missiles.
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block or cesium arc-lamp that radiates a large amount of infra-red energy. It is surrounded by a large cylindrical mechanical shutter that modulates the infra-red output, producing a pulsing pattern. Early infrared guided missiles used a rotating
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The introduction of rosette and "staring" scanning techniques in second generation missiles reduced the effectiveness of the ALQ-144 and 147; later upgrades restored the effectiveness of the jammers.
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in 1981. Currently there are over 3,500 in use with the US military, and a total of 6,000 in use by nineteen countries globally. Seven hundred ALQ-157 systems are currently in service.
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in the persian Gulf had been upgraded to ALQ-144A standard. The only AH-64 Apache lost to an infra-red guided missile was hit by a
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ALQ-144A(V)5 – Increased protection with a dual phaselocked transmitters and jam code selector switch on the operator control unit
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The ALQ-144's distinctive appearance has earned it the nicknames "disco light", "disco ball", "mirror-ball" or "R2-D2".
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to think that the target was off to one side and cause the missile to steer away from the aircraft carrying the IRCM.
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missiles, against which the ALQ-144 was only partially effective. By the time the war started, two-thirds of the
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The
History of U.S. Electronic Warfare: Volume III, Rolling Thunder Through Allied Force, 1964 to 2000
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ALQ-144A+(5) – Increased protection plus with the dual phaselocked ALQ-144A+ transmitter
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ALQ-157M upgraded system to deal with more recent generations of IR guided missiles.
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ALQ-147A upgraded system to deal with more recent generations of IR guided missiles.
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ALQ-144A upgraded system to deal with more recent generations of IR guided missiles.
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missile; the helicopter in question was one of the few that had not been upgraded.
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60:). They were developed by Sanders Associates in the 1970s to counter the threat of
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72:. While decoy flares were effective at jamming first generation infra-red
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aircraft, consists of two units, each giving semi-circular coverage.
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Military aircraft infrared guided missile countermeasures system
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ALQ-147 mounted in a modified 150 US gallon (570 liter)
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The ALQ-144A was rushed into US service in time for the
399:
The Naval
Institute Guide to World Naval Weapon Systems
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ALQ-157 large aircraft version of the system fitted to
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are US infrared guided missile countermeasure devices (
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ALQ-144A+ – Increased protection with the higher power
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The ALQ-144 and ALQ-147 were first delivered to the
313:List of military electronics of the United States
350:BAE Systems patent, prior art under heading 0069
366:. The Association of Old Crows. p. 451.
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234:ALQ-144A(V)1 – Standard in helicopter jammer
442:Military equipment introduced in the 1980s
427:Military electronics of the United States
432:Equipment of the United States Air Force
294:Civil Aircraft Missile Protection System
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237:ALQ-144A(V)3 – Added RFCM on/off switch
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228:ALQ-144 electrically powered IRCM
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91:Both systems consist of a heated
36:An ALQ-144 jammer mounted on an
308:Northrop Grumman EA-6B Prowler
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255:, it is a fuel powered IRCM.
437:Electronic warfare equipment
386:War in the Fourth Dimension
211:2 kW (later 4 kW)
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447:Electronic countermeasures
298:Electronic countermeasures
114:, as Iraq had stocks of
422:Missile countermeasures
66:surface-to-air missiles
362:Price, Alfred (2000).
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287:Boeing EA-18G Growler
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401:, Norman Friedman,
388:, Dr Alfred Price,
303:Electronic warfare
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16:(Redirected from
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159:Entered service
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93:silicon carbide
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87:ALQ-144/ALQ-147
74:guided missiles
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149:Specifications
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112:1991 Gulf War
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319:Related ECMs
182:12.5 kg
141:Produced by
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38:OV-10 Bronco
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179:1.7 kW
156:Designation
81:US military
416:Categories
336:References
330:AN/ALQ-128
214:99 kg
168:Platforms
54:AN/ALQ-157
50:AN/ALQ-147
46:AN/ALQ-144
325:AN/ALQ-99
253:drop tank
68:like the
281:See also
223:Variants
62:infrared
205:ALQ-157
189:ALQ-147
173:ALQ-144
137:ALQ-157
98:reticle
64:guided
18:ALQ-144
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370:
165:Weight
162:Output
52:, and
292:CAMPS
143:Loral
403:ISBN
390:ISBN
368:ISBN
267:and
208:1984
192:1980
176:1980
120:9K38
118:and
58:IRCM
44:The
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48:,
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198:?
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20:)
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