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Which of the following channels may be used as a voice communication frequency?

  • A

    120.50 MHz

  • B

    115.15 MHz

  • C

    117.30 kHz

  • D

    108.80 MHz

The band normally used for Aeronautical Mobile Service (AMS) voice communication is defined between 118.000 and 136.975 MHz. This is a subpart of the VHF band which requires line-of-sight and is ideal for short-distance terrestrial communication.

The HF band may also be used for voice communication in areas where VHF communication is impractical (i.e. shadowing by high hills, remote oceanic areas).

Frequency band Frequencies Wave band Wave length
VLF Very Low Frequency 3-30 kHz Very long 100-10 km
LF Low Frequency 30-300 kHz Long 10-1 km
MF Medium Frequency 300-3000 kHz Medium 1 km-100 m
HF High Frequency 3-30 MHz Short 100-10 m
VHF Very High Frequency 30-300 MHz Short 10-1 m
UHF Ultra High Frequency 300-3000 MHz Ultra short 1 m-10 cm
SHF Super High Frequency 3-30 GHz (3000-30 000 MHz) Super short 10-1 cm
EHF Extremely High Frequency 30-300 GHz Extremely short 1 cm-1 mm

From the available answers, only the frequency "120.50 MHz" is within the voice communication frequency range of 118.000 and 136.975 MHz.

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