DF 2000. Automatic Radio Direction Finder

Navigation and Surveillance Systems

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.

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°