ADF Navigation System

ADF Navigation System

1. Airborne Equipment

   • Automatic Direction Finder
     • System
       • Indicator
         • Fixed Compass Card Indicator or Relative Bearing Indicator
           • 0 degree coincides with Aircraft Nose
           • ADF Pointer shows Relative Bearing
           • Fixed Compass Card
         • Rotating Compass Card Indicator
           • Manually Adjusted Compass Card
           • ADF Pointer shows Magnetic Bearing
         • Radio Magnetic Indicator
           • Automatic Adjusted Compass Card
           • ADF Pointer shows Magnetic Bearing
       • Control Panel
         • Modes
           • ADF
             • Combine Loop and Sense Antenna
           • ANT / REC
             • Sense Antenna only
           • LOOP
             • Loop Antenna only
           • BFO
             • Audio Tone
           • TEST
             • Self Check
       • Receiver
         • Processes Loop and Sense Signals
           • Drives a Motor
             • Rotates Loop Antenna
             • Rotates ADF Pointer
       • Antenna Assembly
         • Loop Antenna
           • Inductive Type
             • Senses Magnetic Field (H)
           • Radiation Pattern
             • Figure of Eight
         • Sense Antenna
           • Capacitive Type
             • Senses Electric Field (E)
           • Radiation Pattern
             • Omni-directional
         • Combined Loop and Sense Antenna
           • Radiation Pattern
             • Cardioid Pattern
     • Radio Frequencies
       • 190 kHz to 1750 kHz
       • Low and Medium Frequencies

2. Ground Station

   • Non-directional Beacon
     • Types
       • Compass Locator
         • Lower Power
       • NDB Approach Facility
         • Low to Medium Power
       • En-route Airway Beacon
         • Medium Power
       • Coastal Beacon
         • High Power
     • System
       • Transmitter
         • Radio Frequencies
           • 190 kHz to 535 kHz
         • Power
           • 25 to 2000 watts
         • Broadcast Message
           • Morse Code (i.e. dots and dashes)
           • Voice (e.g. weather forecast)
       • Vertical Antenna
         • Radiation Pattern
           • Omni-directional
         • Vertical Polarization