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An '''electronic countermeasures suite''' (or '''ECM''') covers the area around the unit on which it is employed, disrupting sensors and communications.  ECM suites exist for [[BattleMechs]], [[battle armor]], [[Combat Vehicles]], and [[aerospace fighter]]s.
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An '''electronic countermeasure suite''' (or '''ECM''') covers the area around the unit on which it is employed, disrupting sensors and communications.  ECM suites exist for [[BattleMechs]], [[battle armor]], [[Combat Vehicles]], and [[aerospace fighter]]s.
  
 
While this article deals with specific ECM suites, all combat units, from 'Mechs to tanks to aircraft, are equipped with a basic level electronic warfare capability designed to make them harder to track and hit (especially by those not using with a modern [[Targeting-Tracking System]]).<ref>''TechManual'', pp. 217–218</ref>  These systems are also relatively easy to update to deal with unexpected threats: within months of the deployment of the [[Listen-Kill Missile]] during the [[War of 3039]], the [[Draconis Combine]] had developed and distributed to their front-line units a software plug-in which rendered the missile ineffectual.<ref>''Historical: War of 3039'', p. 144</ref><ref>''20 Year Update'', p. 73</ref>
 
While this article deals with specific ECM suites, all combat units, from 'Mechs to tanks to aircraft, are equipped with a basic level electronic warfare capability designed to make them harder to track and hit (especially by those not using with a modern [[Targeting-Tracking System]]).<ref>''TechManual'', pp. 217–218</ref>  These systems are also relatively easy to update to deal with unexpected threats: within months of the deployment of the [[Listen-Kill Missile]] during the [[War of 3039]], the [[Draconis Combine]] had developed and distributed to their front-line units a software plug-in which rendered the missile ineffectual.<ref>''Historical: War of 3039'', p. 144</ref><ref>''20 Year Update'', p. 73</ref>
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== History ==
 
== History ==
Though electronic countermeasures systems had been in use for centuries in the [[Inner Sphere]], towards the end of the [[Age of War]] these systems had become ubiquitous: active camouflage, laser spoofers, and other countermeasures had made it so that many combat units were having difficulty finding and targeting each other until it was too late.  In an effort to combat this fog of war, the [[Star League]] developed the [[Beagle Active Probe]] to cut through the haze of electronic jamming and locate units quicker and sooner than before.  However the League soon became concerned that its [[Great Houses|Member States]] would acquire the Beagle and use it against them, leading to the development of the [[Guardian ECM Suite]].<ref name="ER:2750p101+>''Era Report: 2750'', pp. 101–103: "Museum Technica - ECM Suite"</ref>
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Though electronic countermeasure systems had been in use for centuries in the [[Inner Sphere]], towards the end of the [[Age of War]] these systems had become ubiquitous: active camouflage, laser spoofers, and other countermeasures had made it so that many combat units were having difficulty finding and targeting each other until it was too late.  In an effort to combat this fog of war, the [[Star League]] developed the [[Beagle Active Probe]] to cut through the haze of electronic jamming and locate units quicker and sooner than before.  However the League soon became concerned that its [[Great Houses|Member States]] would acquire the Beagle and use it against them, leading to the development of the [[Guardian ECM Suite]].<ref name="ER:2750p101+>''Era Report: 2750'', pp. 101–103: "Museum Technica - ECM Suite"</ref>
  
 
The Guardian ECM Suite proved to be a powerful electronic warfare device, jamming the Beagle and other advanced electronic systems, but maintaining the system proved too hard for the Great Houses after the fall of the Star League.  The system went extinct in the Inner Sphere in [[2845]] in the midst of the [[Succession Wars (History)|Succession Wars]].<ref name="TMp213">''TechManual'', p. 213: "ECM Suite"</ref>  The Successor States were still able to maintain and produce ECM suites, but these were more primitive, less discerning systems, like those found on the ''[[Packrat]]''.  These jammers were powerful enough, for example, to block out all communications within a given area, but both friendly and enemy forces were equally affected by it.  Commanders operating under such conditions would either have to lay down fiber optic landlines to maintain communication, or conduct their battles based on prearranged plans which might fall apart under ever-fluid battlefield conditions.<ref>''The Price of Glory'', ch. 6, 9</ref>
 
The Guardian ECM Suite proved to be a powerful electronic warfare device, jamming the Beagle and other advanced electronic systems, but maintaining the system proved too hard for the Great Houses after the fall of the Star League.  The system went extinct in the Inner Sphere in [[2845]] in the midst of the [[Succession Wars (History)|Succession Wars]].<ref name="TMp213">''TechManual'', p. 213: "ECM Suite"</ref>  The Successor States were still able to maintain and produce ECM suites, but these were more primitive, less discerning systems, like those found on the ''[[Packrat]]''.  These jammers were powerful enough, for example, to block out all communications within a given area, but both friendly and enemy forces were equally affected by it.  Commanders operating under such conditions would either have to lay down fiber optic landlines to maintain communication, or conduct their battles based on prearranged plans which might fall apart under ever-fluid battlefield conditions.<ref>''The Price of Glory'', ch. 6, 9</ref>
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== Clan Systems ==
 
== Clan Systems ==
 
In the [[Clans]], the Guardian ECM suite never went extinct, and was used as the basis for an improved ECM Suite introduced by [[Clan Smoke Jaguar]] in [[2832]]. This more advanced version of the Guardian, found mounted on machines in every Clan's ''[[touman]]'', has the same capabilities as the original but is lighter and takes up less space.<ref name="TMp213"/>
 
In the [[Clans]], the Guardian ECM suite never went extinct, and was used as the basis for an improved ECM Suite introduced by [[Clan Smoke Jaguar]] in [[2832]]. This more advanced version of the Guardian, found mounted on machines in every Clan's ''[[touman]]'', has the same capabilities as the original but is lighter and takes up less space.<ref name="TMp213"/>
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== Rules ==
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<div class="gamerules">
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=== Game Rules ===
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* In tournament-level gameplay, the use of an ECM suite is to nullify the effects of other electronics, such as [[Narc Missile Beacon|missile beacons]], active probes, and [[Artemis IV FCS|fire control systems]].  It can also cut a unit off from a [[C3 network]].
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* In ''[[Tactical Operations]]'', additional uses for an ECM suite are shown as optional rules, including defeating other ECM and generating ghost targets.
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</div>
  
 
== Apocryphal Content ==
 
== Apocryphal Content ==
 
{{ApocryphalContentStart}}
 
{{ApocryphalContentStart}}
* In ''[[MechWarrior IV: Mercenaries]]'', the ECM is a selectable component for certain [['Mech]]s. It increases missile lock time for enemies and reduces the range at which the 'Mech can be detected.
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* In [[MechWarrior IV: Mercenaries]], the ECM is a selectable component for certain [['Mech]]s. It increases missile lock time for enemies and reduces the range at which the 'Mech can be detected.
* In ''[[MechCommander 2]]'', the ECM is also a component for certain 'Mechs. It makes the 'Mech in question undetectable by sensors. It appears to have no effect on missiles, due to the way in which the game handles weapons fire.
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* In [[MechCommander 2]], the ECM is also a component for certain 'Mechs. It makes the 'Mech in question undetectable by sensors. It appears to have no effect on missiles, due to the way in which the game handles weapons fire.
* [[MechForce Germany]] created rules for the tonnage, crits and bare-bones description of ECM equipment in the ''[[Raven]]'' TRO that was published in ''[[House Liao (The Capellan Confederation)]]''. [[Fantasy Productions GmbH]] then published these rules in ''[[Arena-Planet Solaris VII]]'' (the expanded German edition of the ''[[Solaris VII: The Game World]]'' box set) as "[[ECM 3025]]".
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* [[MechForce Germany]] created rules for the tonnage, crits and bare-bones description of ''ECM equipment'' in the ''[[Raven]]'' TRO that was published in ''[[House Liao (The Capellan Confederation)]]''. [[Fantasy Productions GmbH]] then published these rules in [[Arena-Planet Solaris VII]] (the expanded German edition of the Solaris VII boxed set) as "[[ECM 3025]]".
 
{{ApocryphalContentEnd}}
 
{{ApocryphalContentEnd}}
  

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