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HF Manpack/Mobile Watson Watt Antenna


The DF-A0114 is a Watson Watt antenna array that is suitable for on-the-march / mobile DF of signals from 1 to 88 MHz and above*. The antenna makes use of a patented stabilised loop antenna technology that supresses the effects of onhorizon cross polarisation which originally made loops less attractive for DF applications. The loop radiators provide many hundreds of times more sensitivity than the usual Adcock type designs and similar sized interferometer type arrangements, however, accuracy can be degraded for far off-horizon signals with crosspolar content. Integrated filters are provided to suppress strong emitters above 88 MHz. The antenna is stowable by disconnecting the stalk and top whip attachments and stowing with the main antenna structure. 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 (one being omni-directional)
DF method Watson Watt DF 2- or 3-channel correlative DF
RMS accuracy < 2° in large signal conditions
Sensitivity See attached graph
Antenna element gain 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
Electrical Via multi-cable with connector - Custom output cabling on request
Connector MIL-38999 / 26WG11PN

    Product Applications

    Signals Intelligence
  • Radio Direction Finding
  • C-ESM

    Design Features

  • Extremely high sensitivity compared to similar, or even larger sized Adcock and interferometer technologies. Compact size for better performance than alternate technologies. Omni-directional channel can be used for monitoring Can be used in both Watson Watt and Correlative DF systems. Very robust one-piece radiator mechanical design, few parts to lose.