The Fixed Site Radio Direction Finder

Our fixed site radio direction finders are typically installed in permanent or semi-permanent locations. The VHF/UHF/THF fixed site radio direction finder (RDF) consists of three antennas that can be stacked on top of a mast, tower, or building cover 115 – 1000 MHz in three frequency bands. One may operate these direction finders remotely via an Ethernet or radio-modem connection. When networked with other fixed site or mobile direction finders our TargetTrack software is used to geolocate the targeted RF emitter.

We offer our direction finders as portable packaged systems and rack mounted systems with everything necessary for set up and use. You can also purchase our components.

components of fixed site radio direction finders
Fixed Site Radio Direction Finder Components

In addition, we provide Windows-based software with our fixed site direction finders. As a result, users can configure the direction finders and display the bearings on a map.  The software tunes all networked sites to the same frequency. The bearings from these sites are used to predict the location of the RF source.   

Users can also connect multiple direction finder processors and receivers to a single antenna. Because of this, our fixed site direction finders can work together on up to 32 frequencies.

Specifications for Our Direction Finders

RDF MethodSynthetic-Doppler with “Smooth Summing”
Frequency Range115 – 1000 MHz
Accuracy< 1 deg rms  (115 – 500 MHz)
 < 1.6 deg rms  (500 – 1000 MHz)
Resolution0.1 deg
Sampling Rate2 samples per second
Sensitivity-123 dBm (FM receiver dependent)
AveragingAdjustable from 1 to 20 samples
RF pulse detection100 ms minimum
Commutation frequencyAdjustable (250, 500, 1000, 2000 Hz)
Voltage Range11 – 14 VDC
Power6.5  W @ 12 VDC (processor and antenna)
Temperature Range-25 °C to 85 °C (antenna)
CE CompliantPer EN 61000-6-2, EN 61000-6-4 AND EN 301 489-1

Get Started

To get started with your fixed site radio direction finder, please contact us. We are happy to help you!