Non Directional Beacons
NDB - NON DIRECTIONAL BEACONSAustralian aviation non-directionalbeacon FrequenciesAustralian aviation non-directionalbeacon Frequencies are from 200kHz to 490kHz and represent a usefulsource for studying LF and lower MF band propagation and forrefining receiving systems on and around these bandsAnNDB or Non-Directional Beacon is a ground-based,low frequency radio transmitter used as an instrument approach forairports and offshore platforms.The NDB transmits an omni-directional signal that is received by theADF or Automatic Direction Finder, a standard instrument onboardaircraft.