Question
What frequency range is referred to as HF?
Answer Options
- A) 300 to 3000 MHz
- B) 30 to 300 MHz
- C) 3 to 30 MHz
- D) 300 to 3000 kHz
Correct Answer: C
Explanation
HF stands for High Frequency. This range is officially defined as 3 to 30 MHz. The amateur radio bands in this range include the popular 80-meter (3.5 MHz) all the way up to the 10-meter (28 MHz) band.
HF signals are unique because they can be refracted by the ionosphere (T3A11), allowing for reliable, long-distance communication over thousands of miles, especially at night or during peak solar conditions.
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