A signal jammer was a device capable of jamming communications feeds.
Gall Trayvis, a Senator of the Imperial Senate in exile, owned a signal jammer. He used his device to temporarily block Imperial feeds. They would shut him out quickly once they detected the intrusion, but before they could, he would take over the feed and make his own broadcasts, which Sabine Wren described in her personal journal as "a concentrated dose of the TRUTH", though Trayvis' messages were actually a cover intended to lure rebels into traps.
- Queen's Shadow (First appearance)
- Heir to the Jedi (Mentioned only) (as jammer)
- TIE Fighter 1: The Shadow Falls, Part 1 (Mentioned only)
- Sabine My Rebel Sketchbook (First mentioned)
- Rey's Survival Guide
- Cyphers and Masks
- Star Wars: Imperial Assault – Tyrants of Lothal (Card: Signal Jammer)