Low Frequency Automatic Direction Finding: Equipment that determines bearing to a radio station on a low frequency band, usually the standard AM band.
Low frequency noise and high velocity air generated by jet engines on takeoff.
Related Definitions from Aviation Glossary ...
LOW FREQUENCY- The frequency band between 30 and 300 kHz.
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Low frequency radio 200-1600 KHz with both loop and sense antennas. Not limited to line-of-sight but by power. HH power good for 200 miles down to compass locator or locator outer marker (LOM) at 15 miles.
VLF - very low frequency. Radio frequencies in the 3-30 kHz band
VLF/Omega - worldwide system of long-range navigation using VLF radio transmission.
VMC - Visual Meterorological Conditions. See VFR, above.
Thunderstorm lightning is most noticeable in these low frequency bands and can give a short burst on the indicator, it momentarily points to the storm.
BACKBLAST - Noise generated by jet exhaust on takeoff characterized by high acoustic energy, low frequency, and high velocity air behind the aircraft engine.
 See also: Aircraft, Pilot, Flight, Runway, Navigation
  
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