What is the range of ECM jammer in Payday 2? Let's say I put it in the middle of the jewelry store's shopping room in the Jewelry Store Heist mission, how far it will reach?
There is further discussion about the topic in the above link on the PAYDAY 2 Forums, but the people who HAVE tested it believe that it covers the entire map.
The exact range of ECM is unknown, however, the range is limited and might or might not cover the whole map depending on its size. Update #12 shed some light on this question with the following.
Buffed the ECM jammer by increasing the range -- source