The com scrambler disrupts enemy communication, but it also scrambles friendly communication. Mounted on a backpack frame, a com scrambler can be carried to the front line and even into enemy territory, where it can be connected to a power source and left behind.

A com scrambler covers a 20-kilometer radius, blanketing the area in powerful white noise that disrupts all comlinks, HoloNet signals, and droid remote receives within the area. Getting a signal into or out of the affected area requires a Use Computer check against the com scrambler’s default Use Computer +10. This check must be made every minute as the com scrambler’s computer constantly scans and adapts to block any signals it locates.

Source: Galaxy at War, p. 46