Antenna Authority, Inc
Phone (770) 577-7969




Provides 4 cardioid patterns in the cardinal directions utilizing appropriate AAI modulator

Product Code --- DASA-3172 DF ANTENNA
Downloadable PDF file

Back view connections                          Front view

An Accurate Compact Antenna for Mobile Operations

 The DASA-3172 Mobile DF Antenna is a VHF/UHF antenna consisting of 2 annular slot elements enclosed within the antenna housing for accurate and repeatable bearings. It includes the modulator, control and coax cables. The antenna is designed to receive vertically polarized signals in the 20 MHz to 1 GHz frequency range.

The antenna electronics are mounted inside the chassis with the antenna elements and chassis is enclosed with a compact PVC ­formed, ruggedized, and lightweight abrasive resistant cover with UV protection. Vehicle mounting brackets are provided for stability and are attached to the bottom of the chassis to facilitate vehicle installation.  All power and control signals to the antenna are provided through one 9 conductor control cable via the DF processor. The received signal with bearing information encoded is routed to the receiver through a RF coaxial cable. Control signals are compatible with the AADF-3101 DF Processor by Antenna Authority Inc.

Electrical Specifications

Frequency Coverage:                             

20 MHz to 1.1 GHz

Azimuths Coverage:                              

360° in azimuth


Manually set depending on receiver and
antenna location

DF Technique:                                      

Watson-Watt single frequency


 4-element dual annular slot multiple bays

Bearing Accuracy:                                

 6° rms


Voltage: 11.5 - 14.5 VDC


Current 0.5 amps




50 ohms




TNC, Amphenol PT02A 

Mechanical Specifications


Width: 23"  -  Length: 23"


Height: 5",  Weight: 15 lbs


Operating: -40°C to +60°C


Storage: -40°C to +70°C   Humidity: 95%


Aluminum, FR-4, Foam, PVC


Black PVC UV Protection

 Typical Gain and Pattern of Annular Slot Antenna

Ordering Information

Antenna          Model No.      DASA-3172                

DF Processor required        Model No. AADF-3101

One year warranty on parts and labor

Specifications subject to change without notice

Printed in U.S.A. Copyright 4/1/2011

If you have a need for optimized frequency coverage not indicated here, please contact Ferrel  - info below - we can customize to your needs.

Antenna Authority offers a wide assortment of directional, wideband antennas and other equipment used for radio direction finding and Geo location. We are experts in covert antennas, vehicles and their operation. We are also ready to design new products to meet your specific needs.

Antenna Authority, Inc.                Ferrel Bentley - E-Mail
3381 W. County Line Road
Douglasville, Ga. 30135-1145
(770) 577-7969
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