DF-A0115 Strategic High Sensitivity HF NVIS DF Element

The DF-A0115 antenna is a single site location (SSL) HF DF array element.


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Product Code DF-A0115 Category Tag


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The DF-A0115 antenna is a single site location (SSL) high sensitivity HF Direction Finding antenna array element. Polarisation is selectable between linear vertical, RHCP and LHCP though the injecting of different DC voltages onto the switch board via a dedicated control interface.

The antenna is intended for use in constructing Direction Finding antenna interferometer arrays consisting of a number of DF-A0115 antennas. It can be deployed as part of either a linear or circular array. The large physical size of the product provides the best possible sensitivity at HF frequencies.

The antenna includes an integrated switching system and lightning and ESD protection. There are no nonlinear active components in the chain to introduce unwanted distortion on the received signals. In LHCP and RHCP modes, the antenna element is capable of receiving waves of LHCP and RHCP polarisation respectively, incident from the upper half sphere, with a gain peak at θ = 0° (directly upwards). In VP omni mode, the antenna operates similar to a monopole antenna, able to receive waves with vertical polarisation with a gain peak on the horison (or just above it) and a null at θ = 0°.

Unlike competing products of the same kind, this antenna utilises our patented stabilised loop technology that eliminates cross polarisation disturbance of the antenna, providing enhanced reliability, accuracy and repeatability in practical use.

The antenna is designed only for fixed site installation on a plinth or other mechanical support structure.

Active / Passive Active
Dimensions (m) 4500/2700 mm high (Deployed/Stowed)3500/400 mm diameter (deployed/stowed) (excl. ground radials)12000/400 mm diameter (deployed/stowed) (incl. ground radials)16 x 6 m ground radials
Mass (kg) < 60
Maximum VSWR < 2.0:1
Polarisation Linear, vertical, LCP or RCP
Size (m) 4.5
1. End Frequency (MHz) 30
1. Start Frequency (MHz) 1

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