What is the frequency separation between...

Question 1 of 27070lv5MVRaXL3F4MANfZcoO

What is the frequency separation between Transmit and Receive frequencies on a duplex channel?

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Question 1 of 27070

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What is the frequency separation between Transmit and Receive frequencies on a duplex channel?

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🔍 Key Concepts

• Duplex channels use separate frequencies for transmit and receive so both directions can occur at the same time. • On standard VHF maritime duplex channels, the frequency separation is a fixed, internationally agreed offset. • Compare this with simplex channels, where transmit and receive use the same frequency (no separation).

💭 Think About

• First recall whether duplex marine VHF channels typically have a small offset (less than 5 MHz) or a larger one (greater than 5 MHz). • Think about whether this offset needs to be big or just big enough to avoid interference between ship and shore signals on nearby frequencies. • Eliminate any options that seem unrealistically large or small for closely spaced VHF channels around 156–162 MHz.

✅ Before You Answer

• Be sure you understand the difference between simplex (same frequency) and duplex (different transmit/receive frequencies). • Mentally place the VHF marine band (around 156–162 MHz) and ask how far apart ship and coast frequencies can be while still staying in this band. • Confirm that the separation you choose is a commonly cited standard offset in marine VHF duplex channel planning, not a random value.