🔍 Key Concepts

• Simplex vs. duplex radio operation • How VHF marine radios handle transmitting and receiving on a channel • Whether both parties can speak at the same time on a simplex channel

💭 Think About

• Think about a typical VHF conversation between two boats: what happens when one person presses the push‑to‑talk (PTT) button? Can the other person talk at the same time? • Consider how your own handheld VHF works: when you are talking, can you hear the other station at the same time, or only before and after you speak? • Which choice best describes a system where transmit and receive use the same frequency, requiring users to take turns speaking?

✅ Before You Answer

• Remember that in simplex operation, transmit and receive are on the same frequency. • Check which options incorrectly suggest the radio can only do one function (transmit or receive) and rule those out. • Choose the option that matches the idea that users must take turns because the channel cannot carry two voices at once.