How many SITOR (NBDP) signals can occupy the...

Question 1 of 27070EfVn2E1LGYIPjc2euPbA

How many SITOR (NBDP) signals can occupy the space of one voice signal?

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Question 1 of 27070

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How many SITOR (NBDP) signals can occupy the space of one voice signal?

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🔍 Key Concepts

• SITOR (Simplex Teletype Over Radio) / NBDP (Narrow-Band Direct-Printing) is a narrow-band digital mode used in maritime radio • Compare bandwidth of a standard HF voice SSB signal vs bandwidth of one SITOR/NBDP signal • Think in terms of how many narrower channels can be ‘stacked’ side by side inside one wider channel

💭 Think About

• First, recall the approximate bandwidth normally used by one SSB voice channel in kHz. Then think about how wide a single SITOR/NBDP channel is. • If you know both bandwidths, how many of the narrower SITOR/NBDP channels could theoretically fit inside the wider voice channel? Round to a whole number that makes practical sense for channel spacing. • Eliminate any options that would require unrealistically tight spacing or would leave far too much unused spectrum compared to real-world HF channel plans.

✅ Before You Answer

• Verify the typical SSB voice bandwidth used in maritime HF (in kHz). • Verify the standard bandwidth of one SITOR/NBDP channel (in Hz or kHz) from your study materials or radio regulations references. • Check that the number you pick is a reasonable, commonly cited ratio in GMDSS / radio exam prep materials, not just a theoretical value.