Which of the following frequency bands would...

Question 1 / 27070Sezn8ThsmwFh2xwGDe64

Question 1 of 27070Sezn8ThsmwFh2xwGDe64

Which of the following frequency bands would most likely provide reliable communications between two stations that are 100 miles (160 km) apart?

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Question 1 of 27070

Which of the following frequency bands would most likely provide reliable communications between two stations that are 100 miles (160 km) apart?

🔍 Key Concepts

• VHF line-of-sight range versus antenna height and the horizon distance • How MF ground wave and HF sky wave (skip) propagation work over different distances • Typical operational ranges at sea for LF, MF, HF, and VHF communications

💭 Think About

• Think about which bands mainly rely on line-of-sight propagation and whether 100 miles is usually beyond that range for typical ship and shore antennas. • Consider which bands use ground wave versus sky wave (ionospheric) propagation, and which of those is most dependable for a distance of about 100 miles. • Ask yourself: for standard GMDSS and older distress/working channels, which band was commonly used for regional communications out to a few hundred miles?

✅ Before You Answer

• Estimate whether 100 miles (160 km) is normally within or beyond line-of-sight for VHF marine radios. • Recall the usual distance ranges (order of magnitude) where MF ground wave is effective and where HF sky wave becomes more effective. • Verify which bands (LF, MF, HF, VHF) are primarily used in maritime service for regional (hundreds of km), long-haul (thousands of km), and short-range (tens of km) communications.

Question 1 of 27070

Which of the following frequency bands would most likely provide reliable communications between two stations that are 100 miles (160 km) apart?

The Low Frequency (LF) band.

The High Frequency (HF) band.

The Very High Frequency (VHF) band.

The Medium Frequency ( MF ) band.

Question 1 / 27070Sezn8ThsmwFh2xwGDe64

Question 1 of 27070Sezn8ThsmwFh2xwGDe64

Which of the following frequency bands would most likely provide reliable communications between two stations that are 100 miles (160 km) apart?

Back

Question 1 of 27070

Which of the following frequency bands would most likely provide reliable communications between two stations that are 100 miles (160 km) apart?