Question
What is a typical range for tropospheric duct propagation of microwave signals?
Answer Options
- A) 10 miles to 50 miles
- B) 100 miles to 300 miles
- C) 1,200 miles
- D) 2,500 miles
Correct Answer: B
Explanation
Tropospheric ducting is a specific type of atmospheric propagation, mainly affecting VHF, UHF, and microwave signals, where atmospheric layers act like a waveguide. This mode allows signals to travel far beyond the normal line-of-sight range, creating exciting opportunities for weak-signal contacts.
While ducting distances are highly variable depending on the strength and persistence of the weather conditions that create the duct, a typical range achieved by tropospheric duct propagation of microwave signals is 100 miles to 300 miles. In strong, persistent ducts (often over large bodies of water), contacts extending to over 1,000 miles are certainly possible, but the 100-300 mile range is more common for this mode.
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