A ship has been communicating effectively on...

Question 1 / 20E8tu9MDjgrSAhgmOQE9q

Question 1 of 20E8tu9MDjgrSAhgmOQE9q

A ship has been communicating effectively on 16 MHz during daylight hours with a shore station at a distance of 3200 miles. Toward late afternoon and evening what effect would be noticed?

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Question 1 of 20

E8tu9MDjgrSAhgmOQE9q

A ship has been communicating effectively on 16 MHz during daylight hours with a shore station at a distance of 3200 miles. Toward late afternoon and evening what effect would be noticed?

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🔍 Key Concepts

• Ionospheric skywave propagation for HF frequencies around 16 MHz • Differences between daytime and nighttime ionosphere (D-layer absorption vs. F-layer reflection) • How maximum usable frequency (MUF) changes from day to night for long‑range (thousands of miles) communication

💭 Think About

• Think about whether higher HF frequencies (like 16 MHz) work better in strong solar/ionospheric conditions (daytime) or weaker conditions (nighttime). • Ask yourself: for a 3200‑mile path, is 16 MHz closer to a daytime band or a nighttime band for long‑range marine communications? • Consider what usually has to be done with working frequency (go higher or lower) as evening comes on long‑distance HF circuits.

✅ Before You Answer

• Identify whether 16 MHz is typically listed/used as a daylight or nighttime long‑range HF band in marine radio tables. • Check how MUF generally moves lower at night, and what that does to the usefulness of a relatively high HF frequency like 16 MHz over a 3200‑mile path. • Verify whether typical practice in the evening is to shift to a lower HF band (e.g., 8 or 12 MHz) or to a higher one for better range.

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Question 1 of 20

A ship has been communicating effectively on 16 MHz during daylight hours with a shore station at a distance of 3200 miles. Toward late afternoon and evening what effect would be noticed?

Communications should gradually deteriorate and become impossible on this frequency at night.

Communications should be maintained with slight improvement in the signal received from the shore station.

The gray line effect will prevent communications after dark.

Communications should improve and peak at night.

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Question 1 / 20E8tu9MDjgrSAhgmOQE9q

Question 1 of 20E8tu9MDjgrSAhgmOQE9q

A ship has been communicating effectively on 16 MHz during daylight hours with a shore station at a distance of 3200 miles. Toward late afternoon and evening what effect would be noticed?

Back

Question 1 of 20

E8tu9MDjgrSAhgmOQE9q

A ship has been communicating effectively on 16 MHz during daylight hours with a shore station at a distance of 3200 miles. Toward late afternoon and evening what effect would be noticed?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

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