Navigation and Observation Systems
DF 2000. Automatic Radio Direction Finder

PURPOSE

The automatic direction finder (ADF) DF 2000 is intended for the bearing of aircraft (during the operation of on-board radiostation transmitter) via 2—16 frequency channels (depends on a delivered conguration).

SYSTEM CONFIGURATION & FUNCTIONS

The ADF provides bearing of AM-modulated VHF signals using a phase method. The ADF utilizes electric switching of array vibrators (adcock antenna), which causes the rotation of one vibrator. The ADF consists of: processing rack, antenna system, antenna with a test generator, remote control and monitoring equipment, and a shelter with a life-support system.

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MAIN TECHNICAL SPECIFICATIONS

Features

  • Frequency range
    • 118–137 MHz
  • Frequency spacing
    • 25 kHz; 8.33 kHz
  • Modulation type of the direction finding signal
    • AM
  • Modulation depth, at most
    • ≤ 80 %
  • Number of channels operating simultaneously
    • 2—16 depending upon configuration
  • Direction finding sensitivity by each channel, at most
    • ≤ 3 мкВ/м
  • Root-mean-square error of direction finding, at most
    • ≤1°

Direction finding distance at height, at least:

  • (150 ± 50) m
    • ≥45 km
  • (300 ± 50) m
    • ≥65 km
  • (1000 ± 50) m
    • ≥120 km
  • (3000 ± 50) m
    • ≥200 km
  • (10 000 ± 50) m
    • ≥360 km
  • Duration of the direction finding signal, at least
    • 0,5 s
  • Coverage in the vertical plane
    • 60°
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