An ADF provides the aircraft with bearing information with respect to a ground station. To do this, the ground station emits a signal pattern which is:
The Automatic Direction Finding (ADF) is located on an aircraft. The Non-Directional Beacon (NDB) is a ground-based transmitter which transmits vertically polarized radio signals, in all directions (omnidirectional) in the Low Frequency (LF) and Medium Frequency (MF) bands.
The ADF system in an aircraft can identify the position of an NDB by tuning the NDB’s frequency. The ground station (NDB) needs to have an omnidirectional signal because otherwise the ADF cannot determine the location of the NDB.
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