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What is an advantage of an SSR with a ‘selective addressing mode’ over primary radar?
  • A
    It is independent from airborne(and space)based systems.
  • B
    Its range is unrelated to its transmitting power.
  • C
    It allows for unambiguous aircraft identification.
  • D
    In case of a transponder malfunction, the SSR can be used as a primary radar.

MODE S

Modes A and C are limited to 4096 available codes. With an increasing volume of air traffic, these systems become prone to interference. Mode S was invented to overcome these limitations. "S" stands for Selective Addressing, which means that a specific aircraft may be interrogated by the controller. With selective addressing, signal interference is avoided, further ensuring system accuracy.

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