What term describes a radio that transmits and receives on two different frequencies?

What term describes a radio that transmits and receives on two different frequencies?

• A. Monopole
• B. Duplex
• C. Trunk
• D. Simplex

Answer: (B)

Duplex describes a radio capability where transmission and reception occur on two different frequencies, enabling two-way communication without swapping frequencies. This setup is essential when using a repeater: you transmit to the repeater on one frequency, and the repeater re-transmits on another frequency, allowing you to hear responses while staying on a steady channel. That’s why this term best fits a radio that transmits and receives on two separate frequencies.

For context, a monopole is an antenna type, not about how frequencies are used. Simplex means transmit and receive on the same frequency, so you can’t listen while transmitting on a different channel. Trunk refers to a system for sharing many channels efficiently, not specifically to dual-frequency transmit/receive.