R&S®DDF200M Digital Direction Finder

Radio direction finding on multiple channels

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Key facts

Parallel direction finding on up to 32 maritime channels with the same high DF accuracy and sensitivity on all channels
Quasi-simultaneous direction finding on additional channels outside the maritime frequency range, e.g. distress channels

Brief description

The R&S^®DDF200M digital direction finder represents the latest generation of traffic control direction finders. Radio direction finding for maritime traffic control is performed simultaneously on multiple frequency channels using only one direction finder.

Features & Benefits

Parallel direction finding on up to 32 maritime channels with the same high DF performance on all channels
Quasi-simultaneous direction finding on additional channels outside the maritime frequency range, e.g. distress channels

Specifications

Specifications in Brief
Frequency range	with R&S^®ADD090	118 MHz to 250 MHz

Key facts

Parallel direction finding on up to 32 maritime channels with the same high DF accuracy and sensitivity on all channels
Quasi-simultaneous direction finding on additional channels outside the maritime frequency range, e.g. distress channels
Seamless coverage of a wide frequency range from 118 MHz to 250 MHz (with R&S^®ADD090)
Adaptive interference cancellation (option) in instances where VHF radiocommunications antennas are installed on the same mast as the DF antenna
Output of results to vessel traffic management systems via a serial interface (option) or TCP/IP interface
Serial interface compatible with R&S^®DDF100M (option)

Brief description

Features & Benefits

One direction finder for all frequency channels
- Parallel direction finding on up to 32 maritime channels with the same high DF performance on all channels
- Quasi-simultaneous direction finding on additional channels outside the maritime frequency range, e.g. distress channels
High DF accuracy, sensitivity and immunity to reflections
- Correlative interferometer DF method
- Multi-element wide aperture DF antenna
Adaptive interference cancellation (option)
- Suppression of interference signal caused by strong adjacent transmitters enable direction finding
- Installation of DF antenna and maritime radiocommunications antennas on the same mast
Simple networking and control
- Networking of direction finder, data server and display units via LAN
- Output of DF results to vessel traffic management systems (VTS) via TCP/IP or optional serial interface
- Serial interface compatible with R&S^®DDF100M (option)
- Powerful R&S^®DDF20M-CTL graphical user interface and control software included
Comprehensive selftest capabilities
- Built-in test and automatic alerts in event of error(s)
Integrated DF antenna lightning protection
- No impairment of DF accuracy
- DF accuracy specified in data sheets attained even with lightning rod
- No time-consuming calibration after DF antenna installation

Specifications

Specifications in Brief
Frequency range	with R&S^®ADD090	118 MHz to 250 MHz
System DF accuracy¹⁾	with R&S^®ADD090, in reflection-free environment, including lightning protection, DF error correction not required	≤ 1° RMS, 0.5° RMS (typ.)
DF method		correlative interferometer
Channel resolution	selectable	200 Hz to 2 MHz (includes 12.5 kHz and 25 kHz)
DF sensitivity	with R&S^®ADD090, field strength required for 2° RMS, 15 kHz DF bandwidth, 1 s integration time	5 μV/m
Number of frequency channels in parallel	in the maritime frequency range of 156 MHz to 162 MHz	up to 32 channels
Maximum number of interferers	with interference cancellation	6
Frequency range of the interferers	with interference cancellation	150 MHz to 174 MHz
Interfaces	all DF modes	Ethernet
	optional for DF0, DF1, DF2 and DF3 modes	RS-232
Dimensions	DF unit	½ 19" × 3 HU
	R&S^®ADD090 (Ø × H, with lightning protection)	approx. 2.07 m × 2 m (6.79 ft × 6.56 ft)
Weight	R&S^®ADD090	approx. 40 kg (88.18 lb)

1) Measured in reflection-free environment. The RMS error is calculated from the bearings of evenly distributed samples versus azimuth and frequency.

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