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Which equipment is needed on board of an aircraft to receive signals from a nondirectional beacon (NDB)?

  • A

    Course deviation indicator (CDI)

  • B

    Horizontal situation indicator (HSI)

  • C

    Automatic direction finder (ADF)

  • D

    Secondary surveillance radar (SSR)

NDBs are ground-based non-directional beacons that transmit a simple carrier wave with a modulation to overlay the morse code identifier in the MF or LF band-widths. They are ground stations consisting of just one aerial for transmission.

An ADF (Automatic Direction Finder) is the equipment in the cockpit on board, which measures the direction from which the NDB carrier wave signal came, and points a needle directly towards the NDB in question on one of the pilot's instruments.

Thus, the ADF on board receive signals from a non-directional beacon (NDB) on the ground.

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