Which of the following channels may be used as a VHF voice communication frequency?
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 "118.75 MHz" is within the voice communication frequency range of 118.000 and 136.975 MHz.
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