Mobile Radio Direction Finder

We offer a mobile radio direction finder (RDF) covering frequencies from 100-1000 MHz. The mobile antenna uses roof-mounted summing units and four quarter wave vertical antennas.

Our mobile radio direction finder is available as a packaged unit with everything needed for easy setup and operation. It comes packaged in two pelican cases that can be carried by one person. 

We also provide RDF components that can be used to create a custom solution. A simple mobile radio direction finder system consists of:

Simple Radio Direction Finder Configuration Using Customer Furnished FM Receiver

However, adding a GPS lets the user geolocate targets by using multiple transmissions and multiple locations to save bearing readings.  In addition, an optional yaw rate sensor provides better line-of-bearing accuracy if the vehicle makes frequent turns.

GPS addition to mobile radio direction finders
Addition of a GPS Geolocation of the Transmitter

Additionally, our TargetTrack software works with the mobile system to display on a map the location of the vehicle and the measured bearing.  In doing so, multiple measurements provide a target location.  An Android based interface is also offered to facilitate simple homing operations. 

Furthermore, mobile direction finders can be networked with other portable direction finders or fixed site systems using a mobile broadband connection. One can also use radio modems.

DF MethodSynthetic-Doppler with “Smooth Summing”
Frequency Range100 – 1000 MHz
Accuracy< 2.5 deg rms  (100 – 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-40 °C to 75 °C
CE CompliantPer EN 61000-6-2, EN 61000-6-4 AND EN 301 489-1