Which system allows portable and mobile users to 'hear' other users a great distance away (i.e., 25 miles or more)?

Which system allows portable and mobile users to 'hear' other users a great distance away (i.e., 25 miles or more)?

• A. GPS - Global Positioning
• B. Repeater System
• C. Trunked radio system
• D. Conventional radio system

Answer: (B)

The key idea is extending the range of portable and mobile radio users through a repeater. A repeater is placed at a high location and transmits at higher power. It receives a weak signal from a handheld or mobile radio on a specific input frequency and immediately re-broadcasts it on a separate output frequency at much greater power. This bridge lets users who are far apart or separated by terrain hear each other, often achieving distances like 25 miles or more, depending on elevation, antennas, and terrain. GPS isn’t about voice range; it’s for location, not communication reach. A conventional radio system can cover only as far as its single transmitter/repeater coverage allows, so without a repeater its range is limited. A trunked radio system uses multiple sites to optimize channel use and extend coverage, but the long-distance listening capability for portable users is the result of using a repeater to boost and relay the signal.

The key idea is extending the range of portable and mobile radio users through a repeater. A repeater is placed at a high location and transmits at higher power. It receives a weak signal from a handheld or mobile radio on a specific input frequency and immediately re-broadcasts it on a separate output frequency at much greater power. This bridge lets users who are far apart or separated by terrain hear each other, often achieving distances like 25 miles or more, depending on elevation, antennas, and terrain.

GPS isn’t about voice range; it’s for location, not communication reach. A conventional radio system can cover only as far as its single transmitter/repeater coverage allows, so without a repeater its range is limited. A trunked radio system uses multiple sites to optimize channel use and extend coverage, but the long-distance listening capability for portable users is the result of using a repeater to boost and relay the signal.