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Manpack/Mobile Watson Watt DF Antenna


The DF-A0148 is a wideband DF antenna intended for on-the-move direction finding from 20 - 3000 MHz. The antenna array is implemented as a dual-band vertical stack with the low frequency band enhanced with patented hybrid loop-Adcock technology to provide improved sensitivity vs traditional designs of the same form factor. The antenna presents patterns suitable for the Watson Watt estimation method, as well as 3-channel correlative DF. Band switching is done via an integrated switch and control system. External and internal RF chain calibration is accommodated and a compass and active GPS antenna are also integrated in the antenna. For improved electrical performance in the 20 - 300 MHz frequency band an optional VHF module DF-A0148-VHF) is available. The module also makes use of the Alaris Antennas patented hybrid loop technology and takes advantage of the increased dimensions to improve the sensitivity when compared to the DF-A0148 Band B array. Mounting is directly via the base-mounted MIL DTL 38999 connector interface. An optional spring mounted isolating extension mast is also available for use on vehicles or marine platforms. This provides improved performance over simply mounting the antenna directly to the structures. *CA Application 2,853,219; *EP Patent 2771943; *U.S. Patent No. 14/353,382; *ZA Patent No. 2014/02806

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Frequency range 20 - 3000 MHz
Control - RS 485
Switching time < 1µs when using dedicated lines
Integrated features - Compass (accuracy 3°) - Active GPS antenna
Stored information Model no.
Power supply 6 - 10 V DC
Power consumption < 1 W
Electrical Base-mounted connector (see below)
Connector MIL-38999/20WG11PN
Antenna outputs 3 x co-axial (size 12 contact)
GPS output 1 x co-axial (size 12 contact)
Ext cal input 1 x co-axial (size 12 contact)
Mechanical Spring-mount via connector
Dimensions (h x d) 600 mm x 80 mm (DF-A0148) 600 mm x 130 mm (DF-A0148 -M1) 800 mm x 450 mm (DF-A0148-VHF)

    Product Applications

    Signals Intelligence
  • Radio Direction Finding
  • C-ESM