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Refer to figure.
What radio navigation aid can be received with the attached aerial?

  • A

    VOR

  • B

    DME

  • C

    NDB

  • D

    VDF

NDBs are non-directional beacons that transmit a simple carrier wave with a modulation to overlay the morse code identifier. They are a ground station consisting of just one aerial for transmission.

The ADF (Automatic Direction Finder) is the equipment in the cockpit 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.

The attached aerial is an ADF and receives signal from a NDB ground radio navigation aid.

Note:

  • VOR: Very High Frequency (VHF) Omni-directional Range
  • DME: Distance Measuring Equipment
  • VDF: Very High Frequency (VHF) Direction Finder

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