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The operating frequency range of a low altitude radio altimeter is…

  • A
    420 MHz to 440 MHz.
  • B
    460 MHz to 480 MHz.
  • C
    4 200 MHz to 4 400 MHz.
  • D
    4.6 GHz to 4.8 GHz.

Refer to figures.
The radio altimeter can be defined as a self-contained on-board aid used to measure the true height of the aircraft. The RA operates between 4 200 MHz and 4 400 MHz and the maximum range for indication is typically from the ground up to 2500 ft.

The height measurement is based upon a frequency modulation wave, for which the frequency difference between the transmitted wave (by a first antenna) and the received wave (by a second antenna) after ground reflection is measured. The transmitted and received It provides data to the TCAS, the GPWS, and the Autoland system.

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