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Which band is normally used for Aeronautical Mobile Service (AMS) voice communication? Select the most correct one:
  • A
    The frequency band immediately below UHF of which 124 kHz is part of.
  • B
    The frequency band immediately above MF of which 124 MHz is part of.
  • C
    The two frequency bands just below UHF of which 50 MHz is part of.
  • D
    The frequency band usually used is VLF.

The Aeronautical Mobile Service voice communication refers to VHF and HF voice communication (the latter being the most used, whereas HF is only used for long range flights). The radio frequency spectrum is divided into bands. The frequency bands and respective frequencies are as follows:

  • VLF (Very Low Frequency) => 3 - 30 kHz
  • LF (Low Frequency) => 30 - 300 kHz
  • MF (Medium Frequency) => 300 - 3 000 kHz
  • HF (High Frequency) => 3 - 30 MHz
  • VHF (Very high Frequency) => 30 - 300 MHz
  • UHF (Ultra High Frequency) => 300 - 3 000 MHz
  • SHF (Super High Frequency) => 3 - 30 GHz
  • EHF (Extremely High Frequency) => 30 - 300 GHz
=> 50 Mhz is VHF frequency. VHF and HF bands are just below UHF frequency band.

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