This product comes from Alaris Antennas catalogues

HF Mobile Watson Watt Antenna


The DF-A0134 is a Watson Watt antenna array that is suitable for 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use of a patented stabilised loop antenna technology that supresses the effects of onhorizon cross polarisation which originally made loops less attractive for DF applications.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 to mobile platforms via a NATO 4 or 6 hole pattern flange and is spring loaded to allow the antenna to withstand some contact with overhead objects. 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.

Additional information

Product Data sheet

Download data sheet

Additional product downloads

No additional product downloads available.


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
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
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)
Power/ctrl** 7 x pin (size 12 contact)
Mechanical Detachable spring mount for backpack

    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. ÔÇ? 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.