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Compact Adcock DF Antenna


The DF-A0111 is a wideband compact DF antenna appropriate for use with the Watson Watt method. It can also be used in 3 or 2-channel correlative systems. The antenna uses primarily Adcock type arrays, and incorporates a patented high sensitivity hybrid loopAdcock topology for the lowest frequency band to maintain high sensitivity for its size. Each band offers an omni-channel output that can also be used for monitoring. Band switching is done by a switch integrated into the antenna. An on-board wideband noise source is provided to allow for downstream RF channel calibration. An on-board electronic compass is provided. Communication to, and control of, the antenna is provided by means of RS485 interface. Band switching can also be accomplished via direct differential pair switching for higher speed if needed.

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Frequency range 20 - 6000 MHz
Channels per band 3
DF method Watson-Watt or 3-channel CIDF
RMS large signal accuracy Refer to graph below
Polarisation Vertical
Omni-output Yes (utilised for Watson Watt estimation)
Nominal input impedance 50 O
Control - RS 485 serial at 115 kbaud - two switching lines
Switching time < 100 µs using serial commands < 4 µs when using dedicated lines
Integrated compass Available on RS485 serial. Accuracy 2°
Stored information Model no.
RF calibration (DF-A0111 only) RF chain calibration using Integrated noise source or external applied signal
Power supply 15 ±2 V DC
Power consumption < 1 W (noise source and compass off)
Electrical Connectors recessed into base of antenna

    Product Applications

    Signals Intelligence
  • Radio Direction Finding
  • C-ESM