RF PREP // FCC AMATEUR RADIO

G3 · Radio Wave Propagation

General · correct answers only, in question-pool order.

G3A01

How does a higher sunspot number generally affect HF propagation?

AnswerIt increases the probability of good propagation at higher HF frequencies.

Greater solar activity can increase ionization that supports long-distance propagation on the higher HF bands.

G3A02

AnswerIt disrupts lower-frequency signals more than higher-frequency signals.

Solar X-rays can sharply increase D-region absorption on the sunlit side of Earth, hitting lower HF frequencies especially hard.