What mode must Coast Guard DSC be in to receive old AM transmissions?

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Prepare for the OSC SWE Operations Specialist Chief E-7 Exam. Study with flashcards and multiple choice questions, each providing hints and detailed explanations. Ace your exam effortlessly!

Multiple Choice

What mode must Coast Guard DSC be in to receive old AM transmissions?

Explanation:
Old AM transmissions require a carrier so the receiver can recover the audio via envelope detection. The mode designated for standard AM voice on Coast Guard HF channels is H3E, which preserves that carrier. Other options are forms of single‑sideband or data modes that either suppress the carrier or carry digital signals, which won’t reproduce the traditional AM audio envelope. So to hear old AM transmissions, you’d set the radio to H3E.

Old AM transmissions require a carrier so the receiver can recover the audio via envelope detection. The mode designated for standard AM voice on Coast Guard HF channels is H3E, which preserves that carrier. Other options are forms of single‑sideband or data modes that either suppress the carrier or carry digital signals, which won’t reproduce the traditional AM audio envelope. So to hear old AM transmissions, you’d set the radio to H3E.

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