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An NDB transmits a signal pattern in the horizontal plane which is:
  • A
    a cardioid balanced at 30 Hz
  • B
    omnidirectional
  • C
    a beam rotating at 30 Hz
  • D
    bi-lobal circular

Non-directional Beacon (NDB)

The NDB is a ground-based transmitter operating in the MF or LF band-widths and situated in a ground station that broadcasts signals in all directions (omnidirectional), which are received by the ADF or Automatic Direction Finder, a standard instrument onboard aircraft.

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