What frequency range is used for sky wave propagation?

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Prepare for the NTC Restricted Radiotelephone Operator’s Certificate (RROC) - Aircraft Test. Study with flashcards and multiple-choice questions, each with hints and explanations. Ensure success on your examination!

Multiple Choice

What frequency range is used for sky wave propagation?

Explanation:
Sky wave propagation happens when radio waves are reflected by the ionosphere, sending signals beyond the horizon. The ionosphere is most effective at reflecting frequencies in the high-frequency band, roughly from 3 to 30 MHz. At frequencies below this range, absorption and other propagation factors make reliable sky wave usage poor, while above this range the waves tend to pass through the ionosphere instead of reflecting, so long-range reflection isn’t available. So the best range for sky wave is about 3 to 30 MHz.

Sky wave propagation happens when radio waves are reflected by the ionosphere, sending signals beyond the horizon. The ionosphere is most effective at reflecting frequencies in the high-frequency band, roughly from 3 to 30 MHz. At frequencies below this range, absorption and other propagation factors make reliable sky wave usage poor, while above this range the waves tend to pass through the ionosphere instead of reflecting, so long-range reflection isn’t available. So the best range for sky wave is about 3 to 30 MHz.

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