Question
What is a characteristic of HF communication compared with communications on VHF and higher frequencies?
Answer Options
- A) HF antennas are generally smaller
- B) HF accommodates wider bandwidth signals
- C) Long-distance ionospheric propagation is far more common on HF
- D) There is less atmospheric interference (static) on HF
Correct Answer: C
Explanation
The defining characteristic of HF (High Frequency, 3–30 MHz) communication is that the signals are readily refracted (bounced) by the ionosphere (T3A11), allowing for reliable, intercontinental communication. Thus, long-distance ionospheric propagation is far more common on HF.
In contrast, VHF/UHF are primarily limited to line-of-sight communication. The other options are incorrect: HF wavelengths are long, resulting in much larger antennas than VHF/UHF, and HF typically has more atmospheric static (QRN) from lightning and thunderstorms.
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