At mid-day, what would be the best choice in...

Question 1 / 27070RPWpb60FXq3JHsLl8lCJ

Question 1 of 27070RPWpb60FXq3JHsLl8lCJ

At mid-day, what would be the best choice in attempting to communicate with a shore station 15 miles distant?

Question 1 of 27070

At mid-day, what would be the best choice in attempting to communicate with a shore station 15 miles distant?

🔍 Key Concepts

• VHF (Very High Frequency) vs HF (High Frequency) radio bands and their typical uses • How time of day (mid-day vs night) affects radio wave propagation, especially for HF • The normal range and purpose of marine VHF (156–174 MHz) for ship-to-ship and ship-to-shore

💭 Think About

• Which radio bands listed are normally used for marine VHF communications with nearby shore stations? • How does skywave/ionospheric reflection affect HF frequencies (like 12 and 22 MHz) compared with higher VHF frequencies over a relatively short distance like 15 miles? • For a 15‑mile distance in daylight, do you primarily rely on line-of-sight or on long-distance skip propagation?

✅ Before You Answer

• Identify which option corresponds to the standard marine VHF band (Channel 16, working channels, etc.) • Check typical service range of marine VHF for a vessel to a shore station and compare it to 15 miles • Confirm which bands (in MHz) are more suitable for long-range HF skywave communication rather than short-range coastal communication

Question 1 of 27070

At mid-day, what would be the best choice in attempting to communicate with a shore station 15 miles distant?

16 MHz band

156 - 164 MHz band

12 MHz band

22 MHz band