Which statement best describes a simplex system?

Which statement best describes a simplex system?

• A. Requires a repeater to reach distant users
• B. Uses multiple transmitters to cover same area
• C. Transmits and receives on the same frequency without needing a repeater
• D. Is a satellite-based system

Answer: (C)

Simplex operation means direct radio-to-radio communication on a single frequency with no repeater in the path. This setup lets two radios talk to each other directly when they are within range and there’s a clear path, without relying on any infrastructure. Because there’s no separate input and output channel, the radios switch between transmitting and receiving, so you can’t talk and listen on the exact same moment in the same way you would on a full-duplex link. This is why the description “transmits and receives on the same frequency without needing a repeater” best captures a simplex system. The other scenarios involve infrastructure or separate channels to extend coverage—repeater use to reach distant users, multiple transmitters to cover the same area, or a satellite-based link—not the direct, single-frequency communication that defines simplex.

Simplex operation means direct radio-to-radio communication on a single frequency with no repeater in the path. This setup lets two radios talk to each other directly when they are within range and there’s a clear path, without relying on any infrastructure. Because there’s no separate input and output channel, the radios switch between transmitting and receiving, so you can’t talk and listen on the exact same moment in the same way you would on a full-duplex link.

This is why the description “transmits and receives on the same frequency without needing a repeater” best captures a simplex system. The other scenarios involve infrastructure or separate channels to extend coverage—repeater use to reach distant users, multiple transmitters to cover the same area, or a satellite-based link—not the direct, single-frequency communication that defines simplex.