Which central station system uses repeaters?

• A. Local wired system
• B. Satellite uplink
• C. Long-range radio
• D. Cellular network

Answer: (C)

The signal path that benefits most from repeaters is the long-range radio system. Repeaters are devices that receive an incoming radio signal, amplify it, and retransmit it onward. This lets the alarm signal cover much larger distances and pass around obstacles, which is essential for a central station that must receive alerts from distant or dispersed sites. Local wired systems don’t use radio signals at all, so repeaters aren’t involved. Satellite uplinks rely on satellites to carry the signal, not on terrestrial repeaters. Cellular networks use a network of towers; while boosters exist, the central concept of repeaters as a way to extend a single radio signal’s reach is characteristic of long-range radio systems.