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Question 20303
JEE Physics · Hard

Principles of Communication: Propagation MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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PropagationHardQuestion 20303

Question

The Optimum Working Frequency (OWF) for HF sky-wave communication is chosen as approximately:
  1. A
    Equal to critical frequency f_c
  2. B
    50% of MUF
  3. C
    85% of MUF
    Correct
  4. D
    150% of MUF

Correct answer

85% of MUF

Explanation

OWF ≈ 0.85 × MUF. Operating exactly at MUF risks signal loss if the ionosphere weakens slightly. OWF provides an 15% safety margin. In practice, operators choose an OWF that remains below MUF 90% of the time for reliable communication.

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