Question 1 of 20
Q
Which of the following channels may be used for duplex communications?
A
Ch-70
B
Ch-26
C
Ch-5A
D
Ch-22A
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Question 1 / 20VONs704sFLoDyT5dMnRs
Question 1 of 20VONs704sFLoDyT5dMnRs

Which of the following channels may be used for duplex communications?

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Question 1 of 20
VONs704sFLoDyT5dMnRs
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Which of the following channels may be used for duplex communications?

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🔍 Key Concepts

• Simplex vs duplex VHF channels (one-way-at-a-time vs simultaneous transmit/receive) • The special use of Channel 70 for Digital Selective Calling (DSC) • Meaning of the letter "A" in channels like 5A or 22A (U.S. simplex versions of duplex channels)

💭 Think About

• Which listed channels are dedicated to safety or calling functions only, and how does that affect the type of communication allowed? • What does the presence of an "A" after a channel number usually tell you about whether it is simplex or duplex? • Among the choices, which channel is commonly used for routine port operations or working traffic rather than distress, calling, or safety-only functions?

✅ Before You Answer

• Confirm which channels are designated simplex vs duplex in the VHF marine channel list. • Verify the special restriction on Ch-70 (DSC only, no voice) and how that relates to duplex use. • Check whether channels ending in "A" are typically simplex U.S. variants of international duplex channels.

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