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

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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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