What is the most common type of emission for...

Question 1 / 27070gY1Xo3Q7yqRloQMGAYdK

Question 1 of 27070gY1Xo3Q7yqRloQMGAYdK

What is the most common type of emission for shipboard VHF-DSC transceivers?

Back

Question 1 of 27070

Q

What is the most common type of emission for shipboard VHF-DSC transceivers?

🔍 Key Concepts

• VHF-DSC radios carry both normal voice traffic and digital selective calling signaling • Emission designators: the letter-number-letter pattern tells you modulation type, nature of signal, and type of information (voice vs data) • Distinguish between emissions used for analog voice radiotelephony and those used for digital data/telex/DSC

💭 Think About

• Which of these emission types is typically associated with standard FM voice on marine VHF channels? Which is usually linked to SSB or AM voice? • Which emission class is used for narrow-band digital signals such as DSC rather than plain speech? • Think about how a combined VHF-DSC set is actually used on board: which emission does it use for routine voice calls, and which for the DSC calling on Channel 70?

✅ Before You Answer

• Identify which option corresponds to frequency-modulated voice commonly used on marine VHF • Identify which option corresponds to single sideband or AM-type voice, usually not used on VHF marine channels • Identify which of the remaining options is specifically associated with digital selective calling/data rather than ordinary speech

Question 1 of 27070

Q

What is the most common type of emission for shipboard VHF-DSC transceivers?

A

F1B

B

J3B

C

G3E

D

H3E

Question 1 / 27070gY1Xo3Q7yqRloQMGAYdK

Question 1 of 27070gY1Xo3Q7yqRloQMGAYdK

What is the most common type of emission for shipboard VHF-DSC transceivers?

Back

Question 1 of 27070

Q

What is the most common type of emission for shipboard VHF-DSC transceivers?

🔍 Key Concepts

• VHF-DSC radios carry both normal voice traffic and digital selective calling signaling • Emission designators: the letter-number-letter pattern tells you modulation type, nature of signal, and type of information (voice vs data) • Distinguish between emissions used for analog voice radiotelephony and those used for digital data/telex/DSC

💭 Think About

• Which of these emission types is typically associated with standard FM voice on marine VHF channels? Which is usually linked to SSB or AM voice? • Which emission class is used for narrow-band digital signals such as DSC rather than plain speech? • Think about how a combined VHF-DSC set is actually used on board: which emission does it use for routine voice calls, and which for the DSC calling on Channel 70?

✅ Before You Answer

• Identify which option corresponds to frequency-modulated voice commonly used on marine VHF • Identify which option corresponds to single sideband or AM-type voice, usually not used on VHF marine channels • Identify which of the remaining options is specifically associated with digital selective calling/data rather than ordinary speech