Which mode occupies the least bandwidth?
Official USCG Answer & Rule Citation
Correct Answer: Option B — J2B
J2B is a digital emission mode (phase-shift keyed telegraphy) that occupies a very narrow bandwidth compared to analog voice modes like H3E or F3E. Its efficiency makes it ideal for GMDSS data transmissions where minimizing spectral footprint is critical for reliable communication in congested MF/HF bands.
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