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

  • A

    118.75 MHz

  • B

    327.25 MHz

  • C

    327.25 kHz

  • D

    118.75 kHz

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 bandFrequenciesWave bandWave length
VLFVery Low Frequency3-30 kHzVery long100-10 km
LFLow Frequency30-300 kHzLong10-1 km
MFMedium Frequency300-3000 kHzMedium1 km-100 m
HFHigh Frequency3-30 MHzShort100-10 m
VHFVery High Frequency30-300 MHzShort10-1 m
UHFUltra High Frequency300-3000 MHzUltra short1 m-10 cm
SHFSuper High Frequency3-30 GHz (3000-30 000 MHz)Super short10-1 cm
EHFExtremely High Frequency30-300 GHzExtremely short1 cm-1 mm

From the available answers, only the frequency "118.75 MHz" is within the voice communication frequency range of 118.000 and 136.975 MHz.

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  • Austro Control