This product comes from Alaris Antennas catalogues

HF On-the-March DF Interferometer


The DF-A0113 is a 3-element interferometer type antenna array that is suitable for on-the-march DF of signals from 1 to 88 MHz. The antenna elements are dipoles fed using a balun arrangement, optimised for maximum gain in the band of relevance. The array spacing is as large as practically possible to provide for the highest possible sensitivity in the HF band. Integrated filters are provided to suppress strong emitters above 88 MHz. The flexible rubber-coated antenna elements are quick-removable for compact stowing with the balun unit and central mounting stalk. The antenna is mounted via a quick-disconnect spring fitting to the manpack. Output from the antenna is provided by means of a multi-RF cable assembly using a MIL-DTL-38999 standard connector providing the three output RF signals on a single connector interface. A version of the antenna can be provided with 3-to-2 commutation capability via an integrated RF switch system. This system also provides integrated electronic compass and GPS antenna. Power, control and data are via the same shared MIL-DTL-38999 connector.

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Frequency range 1 - 88 MHz*
Channels 3
DF method 2- or 3-channel interferometry 2- or 3-channel correlative DF
RMS accuracy Typ. < 2° in large signal conditions
Sensitivity See attached graph
Polarisation Vertical
Control - RS 485 & dedicated strobe line
Commutation switching time < 1µs when using dedicated line
Integrated features - Compass (accuracy 3° RMS) - Active GPS antenna
Stored information Model no.
Power supply 12 V DC
Power consumption < 1 W
Connector MIL-38999 / 26WG11PN
Antenna outputs 3 x co-axial (size 12 contact)
GPS output** 1 x co-axial (size 12 contact)

    Product Applications

    Signals Intelligence
  • Radio Direction Finding
  • C-ESM

    Design Features

  • Compact when stowed Low visual signature and lightweight when deployed Stealthy, low noise movement Very solid DF under the most extreme practical conditions (e.g. cross-polarisation, extreme off-horizon signal incidence - see Simulated Theoretical Accuracy plot for off-horizon incidence with 45° slant polarised signals)