The DF-A0085 dual-polarised fixed site direction finding antenna that covers a frequency range of 20 MHz to 3.6 GHz. The full-size elements on all bands give excellent DF sensitivity. Ultimate angular resolution for strong signals is well under 1° for most of the frequency range. Dipole elements provide good cross-polarisation rejection, and fair performance for signals arriving from up to 15° above or below the horizon The DF-A0085 is capable of HP and VP DF, selectable for Band A and B, with each polarisation requiring characterisation. Two outputs are provided per element in each of bands A and B, one each per polarisation. Band C is polarisation agnostic, allowing concurrent VP, HP and LHCP DF a single characterisation table utilising the array of spiral antennas provided. This DF antenna is designed to be used as a multi-channel phase-sensitive receiver, and correlative algorithm. Characterisation of the antenna can be performed on request. The DF-A0085 provides a weatherproof interface at the top of the antenna onto which a lightning protection system can be mounted.
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Frequency range: Band A Band B Band C | 20 - 300 MHz; 300 - 1000 MHz; 1000 - 3600 MHz |
Gain | See gain graphs |
VSWR | See VSWR graphs |
3 dB Beam width | 60 ° (typical on all bands) |
Front-to-back ratio (Band C only) | 20 dB (typical) |
1 st Side lobe level (Band C only) | -15 dB (typical) |
Cross polarization ratio: Band A Band B Band C | 15 dB (typical) 15 dB (typical) 20 dB (typical) |
Nominal input impedance | 50 O |
Max received power | 2 W |
Antenna type | 5-element |
Polarisation | Vertical |
Strong signal DF accuracy | < 2° RMS* |
Output cables | EF400 cables (qty 25) |
Connectors | SMA male |
Cross-sectional wind load area | 0.75 m² |