What is the emission designation for MF-HF voice signals?
Official USCG Answer & Rule Citation
Correct Answer: Option B — J3E
J3E is the ITU emission designation for Single Sideband Suppressed Carrier (SSB) telephony. In GMDSS operations, MF and HF voice communications utilize this mode to maximize power efficiency and bandwidth by transmitting only one sideband and suppressing the carrier, which is standard practice for long-range maritime voice transmissions.
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