Plasma displacer

A plasma displacer was used by those individuals wishing to removed their starship's transponder code. By patching it into the engines and setting the cobulators back a half pitch, the engine would run hot near the transponder director, effectively distorting and masking the ship's transponder. While a ship close by would be able to read the transponder with a little difficult, it was almost impossible to read at a distance.

Sources

• Cracken's Rebel Field Guide