For the 300th quiz, we need an awesome topic. Lacking the inspiration, an artificial intelligence bot says the coolest thing about amateur radio is the ability to communicate with people all over the world. Looks like we need some DX in the quiz this week!

T3C06 What type of propagation is responsible for allowing over-the-horizon VHF and UHF communications to ranges of approximately 300 miles on a regular basis?

A. Tropospheric ducting

B. D region refraction

C. F2 region refraction

D. Faraday rotation

G3B09 What is the approximate maximum distance along the Earth’s surface normally covered in one hop using the F2 region?

A. 180 miles

B. 1,200 miles

C. 2,500 miles

D. 12,000 miles

E3B07 What effect does lowering a signal’s transmitted elevation angle have on ionospheric HF skip propagation?

A. Faraday rotation becomes stronger

B. The MUF decreases

C. The distance covered by each hop increases

D. The critical frequency increases

Answers:

T3C06 = A

G3B09 = C

E3B07 = C