How many HF frequencies are available for...

Question 1 / 27070tysqIonoFCqhzLO86kPG

Question 1 of 27070tysqIonoFCqhzLO86kPG

How many HF frequencies are available for DSC Distress related calls?

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Question 1 of 27070

Q

How many HF frequencies are available for DSC Distress related calls?

🔍 Key Concepts

• Digital Selective Calling (DSC) distress & safety calling on HF (High Frequency) bands • Difference between MF (2187.5 kHz) and HF DSC distress frequencies • ITU/IMO GMDSS table of HF DSC distress and safety frequencies

💭 Think About

• List the HF marine bands that have dedicated DSC distress and safety frequencies under GMDSS (for example, 4 MHz, 6 MHz, etc.) • Count only the HF DSC distress-related calling frequencies, not voice or NBDP, and not MF • Think about why multiple HF bands are used for distress: how does propagation at different times of day/season affect the number of bands chosen?

✅ Before You Answer

• Be sure you are counting only HF, not including the MF DSC distress frequency at 2187.5 kHz • Use the GMDSS HF DSC distress and safety frequency table (in ITU/IMO references) to see how many distinct HF DSC distress frequencies there are • Confirm you are counting frequencies, not bands or channels, and not mixing in radiotelephony distress frequencies like 4125, 6215, etc.

Question 1 of 27070

Q

How many HF frequencies are available for DSC Distress related calls?

A

Five

B

Four

C

Two

D

One

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Question 1 / 27070tysqIonoFCqhzLO86kPG

Question 1 of 27070tysqIonoFCqhzLO86kPG

How many HF frequencies are available for DSC Distress related calls?

Back

Question 1 of 27070

Q

How many HF frequencies are available for DSC Distress related calls?

🔍 Key Concepts

• Digital Selective Calling (DSC) distress & safety calling on HF (High Frequency) bands • Difference between MF (2187.5 kHz) and HF DSC distress frequencies • ITU/IMO GMDSS table of HF DSC distress and safety frequencies

💭 Think About

• List the HF marine bands that have dedicated DSC distress and safety frequencies under GMDSS (for example, 4 MHz, 6 MHz, etc.) • Count only the HF DSC distress-related calling frequencies, not voice or NBDP, and not MF • Think about why multiple HF bands are used for distress: how does propagation at different times of day/season affect the number of bands chosen?

✅ Before You Answer

• Be sure you are counting only HF, not including the MF DSC distress frequency at 2187.5 kHz • Use the GMDSS HF DSC distress and safety frequency table (in ITU/IMO references) to see how many distinct HF DSC distress frequencies there are • Confirm you are counting frequencies, not bands or channels, and not mixing in radiotelephony distress frequencies like 4125, 6215, etc.