Question
At what point in the solar cycle does the 20-meter band usually support worldwide propagation during daylight hours?
Answer Options
- A) At the summer solstice
- B) Only at the maximum point
- C) Only at the minimum point
- D) At any point
Correct Answer: D
Explanation
The 20-meter band (14 MHz) is widely considered the most consistently reliable long-distance (DX) band on the HF spectrum. Due to the relationship between its frequency and the density of the ionosphere, it almost always finds a path through the F2 layer during daylight hours, regardless of the level of solar activity.
While higher bands like 10m and 15m rely heavily on the solar cycle peak, and lower bands like 40m and 80m are often absorbed during the day, the 20-meter band usually supports worldwide propagation at any point in the 11-year solar cycle. This reliability makes it the primary DX band throughout the entire solar cycle.
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