Practice question

What is the primary factor limiting the propagation range of VHF (Very High Frequency) aviation voice communications?

  1. Line-of-sight propagation limits, since VHF waves do not follow the curvature of the Earth.
  2. Ionospheric absorption during daylight hours.
  3. Acoustic noise attenuation in the lower troposphere.
  4. Sub-surface groundwave attenuation over water.

Answer: A — Line-of-sight propagation limits, since VHF waves do not follow the curvature of the Earth.

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