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HF DF Antenna


The DF-A0048-01 is a compact, stationary and transportable HF direction finding antenna designed for DF systems using the WatsonWatt estimation method, as well as 3-channel correlative DF. Included with the antenna is an integrated quad-pod, a carry bag and guy ropes. The antenna consists of two identical loop antennas arranged in a “crossed-loop" configuration, with a large diameter of 1.6 m to achieve a high sensitivity. The loops make use of Alaris’ innovative and patented cross-polarisation cancelling technology that eliminates disturbances due to cross-polarisation from on-horizon sources. This offers enhanced, reliable accuracy in real-world applications and field trials over traditional crossed-loop designs. In addition to the loops, the DF-A0048-01 provides an omni-directional sense signal that can be used for monitoring and resolving the 180-degree angle of arrival ambiguity that is inherent in crossed-loop type DF antennas. The antenna is made from lightweight materials and designed to be collapsible for quick, easy and repetitive deployment and stowing in a harsh field environment. The product is unique in that it features a fully integrated quadpod for rapid field deployment but can also be bolted to a plinth for semi-permanent installations. When stowed, the antenna collapses into a very small form factor for easy transportation and storage.

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Frequency range 1 - 30 MHz
Channels 3 (including omni)
DF method Watson-Watt or 3-channel CDF
RMS accuracy < 3 ° RMS
Polarisation Vertical
Omni pattern ripple < 3 dB RMS
VSWR < 5:1 (over 90% of the band)
Nominal impedance 50 O
Connector 3 x N-type female
Power handling Receive only
ESD protection All metal parts are grounded
Dimensions deployed Ø 1560 mm diameter 2675 mm height 7260 mm guy rope distance
Dimension stowed (l x w x h) 1320 x 380 x 300 mm
Total mass < 16 kg
Colour Black

    Product Applications

    Signals Intelligence
  • Radio Direction Finding
  • C-ESM

    Design Features

  • Stationary and transportable DF antenna. High sensitivity. Covers the whole HF band. Patented cross-polarisation resistant technology. Externally noise-limited passive antenna. Waterproof. Integrated quadpod for quick deployment. Low visual profile. Compact when stowed.