Turn it off. Or have a preference to turn it off.
Also... hello... real world. How does a mech know it is being targeted? "Captain, we have just been scanned!" In Star Trek, yes. In MWO I have no feeling that any advanced tech is being used. Give a 2000 era engineer 5 lbs limit and the problem and he/she will set you up with a camera, laser on a motor mount and computer that tells you all everything about that ECM'd mech which is in walking in plain view.
Edited by ElLocoMarko, 20 February 2013 - 07:32 AM.