guard band

American  

noun

Radio.

1. an unassigned range of radio frequencies either just above or just below the band of frequencies required for the signal transmitted by a broadcasting station. It helps to prevent interference in receivers between signals from different stations.

---

guard band British  

noun

1. a space left vacant between two radio frequency bands, or between two tracks on a magnetic tape recording, to avoid mutual interference

---

Etymology

Origin of guard band

First recorded in 1955–60