Thats only the extra equipments. Electronic Warfare system in Battletech universe is no more than using ECM. There is nothing more about electronic warfare unless you make a homebrew one.
The Marauder 9S is a good mech . . . its not a electronic warfare mech. A E-War mech is going to do some of the same things IRL EW platforms like the EA-6B & EF-111A and their follow on systems. For BTU, I think it would also include some aspects of what is considered a Wild Weasel mission. IMO for BTU when discussing E-War you want to-
Jam sensors
Break telemetry
Degrade weapons performance remotely
Force the decision about keeping electronics active
Defeat enemy jamming
ECM systems will jam enemy sensors (Active Probes, hidden units, DB rules or hidden RS) and break up telemetry links (NARC, Artemis IV, ATM, C3, C3i and Nova CEWS). ECM pods from iNARC puts out the ECM bubbles remotely and is a great complicating factor when fighting against C3 or C3i- hit that C3 Master with a ECM pod and its got a LOT of problems. The ECM pod can be brushed off but that will cause other complications- or it is removed when that location is destroyed.
iNARC, besides ECM, also offers the Haywire and Nemesis options which fall under degrading weapons performance remotely. Haywire is a variation on ECM (maybe makes that hex ECM, I cannot remember) where it focuses that effort into the chassis where it is attached. Haywires hinder spotting for indirect (aka not possible) and makes it harder to hit targets (adds to +1 TH)- I love putting that on fire support designs.
TSEMP, which I had thought of when making the list but forgot as I was testing current chassis, offers to degrade enemy performance but I am not sure it makes a good E-War weapon since it stands a chance of degrading the platform's abilities and cycles every other turn. Even when it does not shut down enemy equipment, it still causes penalties to their operations.
iNARC Nemesis pods and ARAD munitions can both force a enemy to decide about the risk of operating their own systems. Nemesis pods can divert NARC, Semi-Guided and Homing A4 missiles onto the target with the pod if it is in LOS of the firing unit- this I am going to throw a question up to the Devs about the munition. Either switch to ammo without bonuses, of if not equipped with standard ammo a commander has to consider not firing that weapon. ARAD LRM & SRM munitions track on any electronic emissions on a target- NARC or iNARC beacon (even ignores enemy ECM bubbles), ECM suite, any AP type, C3 slave or master, Artemis IV/V, Apollo, Blue Shield, or Coms Equipment (3.5 or more)- which turns the gear into a penalty. ARAD missiles get a -1 TH and a +1 on cluster roll when fired at such a equipped target, though flips & doubles those as penalties (+2/-2) when fired at targets that are not equipped. ARAD missile loads also offer a synergy for EW- hit a target with a ECM pod and it can disrupt it the listed electronics
and attracts ARAD missiles from any equipped launcher.
Active Probes of various types can offer information, though as noted the benefit depends on the rules in play.
Some sources consider target painting (TAG & NARC Homing Beacon) as part of EW but I think that is more for spotters in the scope of this discussion though good spotters include some EW capabilities.
One thing to note, a lot of the EW capabilities become more important if you are playing with hidden RS. Then the Electronic Warfare Support with such things as active probes, or in this specific instance using remote sensors, comes into play as you are using your equipment to identify specifics about the enemy mechs to help with target prioritization- like detecting a mech with enough com gear to utilize a satellite uplink or give a Init bonus. EWS has both tactical and strategic implications for campaigns- FREX while setting up target prioritization on your current battlefield you would also be able to start listing enemy assets in use to compare to intel on enemy Order of Battles.
