How many SITOR signals can occupy the space of one voice signal?
Official USCG Answer & Rule Citation
Correct Answer: Option C — 6
Because a standard voice channel occupies 3 kHz and an NBDP/SITOR channel occupies 500 Hz, simple division confirms that six SITOR signals can fit into the bandwidth of one voice signal. This spectral efficiency is a primary advantage of digital telegraphy over analog voice for routine maritime data communications.
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