WD-7200 HF/VHF/UHF Interferometer-based Correlative DF System

 Frequency range 100 MHz to 2000 MHz
 High accuracy circular radome antenna
 Rugged, low visibility antenna housing
 Correlative interferometer technology
 Rapid and simple deployment
 High sensitivity
 Effective against short duration signals
 Typical accuracy 2 degrees RMS
 Common reference providing receiver coherency
 Uses wideband digital DDC based receivers
 Low power consumption
 Additional antennas to cover 2-280 MHz
 Highly transportable

WD-7200 Direction Finding System

Delivering a cost-effective yet robust and accurate DF solution for government, military, and law enforcement applications, the WiNRADiO WD-7200 direction finding system employs a sophisticated correlative-vector matching interferometer DF method, combined with statistical signal processing.

The system is small, lightweight and ruggedized. It is suitable for stationary, vehicle-mounted and transportable deployment. It delivers unparalleled flexibility due to its SDR architecture. Excellent accuracy and sensitivity ensure it is capable of filling not only the role of a direction finding system, but also that of a highly capable HF/VHF/UHF COMINT intercept receiver system.

Each WD-7200 system comprises of three main parts: antenna radome, twin coherent receivers, and processing computer.

The radome uses eight sense antennas in a circular array mounted within a weatherproof fiberglass housing. The sense antennas are specially designed dipoles. Also inside the radome is an accurate magneto resistive digital compass, ensuring that the antenna is referenced correctly to magnetic north at all times.

The receivers are a quasi-coherent variant of the well-proven WR-G39DDC SDR. The system is housed in a rugged transportable pelicase-style enclosure.

The WD-7200 exploits a special technique of phase equalization that is both passive and dynamic, ensuring instantaneous optimum performance at all times.

The WD7200 DF technique allows DF and exploitation of many of the new digital waveforms, not possible with pseudo doppler and other analog systems. These include DMR/MOTOTRBO, dPMR, NXDN, D-STAR and APCO P25 (phase 1 and phase 2).

Combining modular hardware design with innovative software, the WiNRADiO WD-7200 HF/VHF/UHF direction finding system delivers unprecedented flexibility and performance.

This is the first time an interferometer-based HF/VHF/UHF direction-finding system with such advanced specifications and capabilities has been made available in such an easy-to-use and cost-effective package. Radixon has achieved this by integrating the best of its WiNRADiO range of COTS software-defined receivers, software tools, and specialist antennas. Radixon supplies and supports thousands of government, military and professional customers worldwide.



The WiNRADiO WD-7200 DF system breaks new ground with its state-of-the-art capability and components. It uses a specially designed quasi-coherent version of the WR-G39DDC receiver together with an eight-element circular radome antenna.


The receiver system is mounted within a transportable enclosure and can be powered either from AC mains or from automotive DC employing optional converters. This allows for stationary and transportable deployment.


A high-performance integrated transportable host computer is used for interfacing with the system and for processing and analyzing received signals.

The WD-7200 can be deployed and working within a few minutes. The system's versatility and relatively lightweight design means it is ideal for static, vehicle-mounted or dismounted deployment.


At the heart of the WD-7200 system is its sophisticated digital signal processing software. In addition to the standard WR-G3xDDC-style graphical user interface, the system software executes all of the complex mathematical functions and associated processes.


The system is entirely software-defined, which means that additional features and modes can easily be added by means of simple software changes.

The azimuth displays are established against the North reference. A dynamically adjustable buffer enables the user to average the bearing samples over time, effectively minimizing bearing degradation due to reflections. Histogram and waterfall displays greatly assist the operator. An integrated digital recorder enables instant recording and playback of received IF signal.


The system can be extended to include the following hardware and software options:

  • GPS receiver allowing position-stamped result logging.
  • Watson Watt HF/VHF antenna suitable for operation in the frequency range of 2-280 MHz.
  • Client-Server software for remote control of receiver and DF functions.
  • The Triangulation/Mapping option requires multiple DF stations linked by a suitable TCP/IP networking infrastructure. Bearing data from the DF stations is used for triangulation. The resulting position is displayed on a map overlay. Map source data is subject to separate licensing arrangements with the respective map provider.
  • Additional monitor for increased screen real-estate if portability is not a major concern.
  • Offline maps for mapping support without an internet connection; which does not require any licensing.
  • DFing and decoding of various digital modes is supported via the optional WiNRADiO Digital Radio Decoder. The supported modes include: DMR/MOTOTRBO, dPMR, NXDN, D-STAR and APCO P25 (phase 1 and phase 2).

Technical specifications
Receiver type Wideband, digitally down-converting software-defined receiver with built-in up-converting 9 kHz-3.5 GHz tuner
DF frequency range Standard models: 100-2000 MHz (with WD-7200-AX340 antenna included) with reduced sensitivity below 250 MHz
Optional frequency extensions: 2-280 MHz (using WD-7200-AX320D antenna)
DF process 8-element correlative interferometer, utilizing quasi-coherent receivers, with dynamic and passive equalization
Number of receive channels Two, using one receiver permanently connected to the reference antenna, and one receiver commutated between the antenna elements
Sensor elements Elevated wideband dipole
Antenna aperture 500mm diameter
DF azimuth accuracy Instrumental accuracy, < 0.5 degree following system calibration. Typ. 2 degrees RMS (for WD-7200-AX340D antenna, in reflection-free environment)
DF sensitivity Typically signals greater than 3 db above noise floor will show azimuth accuracy as above
DF bandwidth Within DDC2, variable from 1 Hz to 320 kHz
Monitoring Full receiver control available during DF operation
Control unit dimensions 475 (W) x 375 (H) x 180 (D) mm
18.7" (W) x 14.7" (H) x 7.1" (D)
Control unit weight 13.5 kg (29.8 lb)
Antenna radome dimensions Height: 355 mm (14.0")
Diameter: 505 mm (19.9")
Tripod height 2.0 m (6.6 ft) max.
Total antenna and tripod weight 17 kg (37.5 lb)
Power supply 115/230 V AC or automotive 12 V DC with optional converters, 100 W max.
Operating temp. -10 °C to 50 °C (14 °F to 122 °F)
Ordering Codes Description
WD-7200 DF system (100-2000 MHz standard WD-7200-AX340 antenna included)
WD-7200-AX320D Optional HF/VHF antenna 2-280 MHz
WD-7200-GPS GPS option
WD-7200-CSO Client-Server option
WD-7200-TMO Triangulation/Mapping and Client/Server option
WD-7200-MAP Offline maps option

Specifications are subject to change without notice due to continuous product development and improvement.

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