Decasignal for skywave propagation corresponds to which frequency range?

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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

Decasignal for skywave propagation corresponds to which frequency range?

Explanation:
Skywave propagation relies on the ionosphere reflecting radio waves back to Earth, which happens best in the high-frequency range. Signals in roughly 3 to 30 MHz can be refracted by the ionosphere and return to distant receivers, enabling long-distance communication. The decameter region, around a 10-meter wavelength, sits near 30 MHz, so it falls within this HF window. That’s why the range 3 to 30 MHz is the correct match for decameter skywave signals. Frequencies well below this (ELF/SLF) or well above this (VHF/UHF) don’t produce the same ionospheric reflection used for long-range propagation.

Skywave propagation relies on the ionosphere reflecting radio waves back to Earth, which happens best in the high-frequency range. Signals in roughly 3 to 30 MHz can be refracted by the ionosphere and return to distant receivers, enabling long-distance communication. The decameter region, around a 10-meter wavelength, sits near 30 MHz, so it falls within this HF window. That’s why the range 3 to 30 MHz is the correct match for decameter skywave signals. Frequencies well below this (ELF/SLF) or well above this (VHF/UHF) don’t produce the same ionospheric reflection used for long-range propagation.

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