Principles of Communication: Propagation MCQ

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PropagationMediumQuestion 20223

Question

Space wave (line-of-sight) propagation is used for:

A
AM radio 540 kHz
B
Short-wave 10 MHz
C
FM radio 100 MHz and TV UHF
Correct
D
ELF submarine communication

Correct answer

FM radio 100 MHz and TV UHF

Explanation

Above ~30 MHz the ionosphere cannot refract waves back to Earth. VHF/UHF/SHF travel in straight lines (LOS). FM (88–108 MHz) and TV (VHF 54–216 MHz, UHF 470–890 MHz) use space waves.

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