The Barrett 2018 mobile magnetic loop HF antenna is significantly more efficient than any whip-type vehicle antenna; producing considerably more transmit and receive power. The 2018 has been integrated in a custom made roof rack. The ground plane for the antenna is a heavy-duty aluminium mesh floor, which is welded to the frame bars, maximising current within the radiating loop.
Using a closed magnetic loop antenna design, the antenna effectively shields and isolates vehicle ignition noise thus providing greater clarity in communications. The roof rack is field proven in some of the world’s worst remote area conditions and is designed to withstand rough corrugated, pot holed and unsealed roads.
The received signal relative to whip antenna systems varies between +10 dB and +14 dB. Base antenna RF currents in a typical whip system are in the order of 1.5 Amperes, whereas the antenna current in the Barrett 2018 approaches 15 Amperes.
The 2018 antenna includes a built-in broadband scan amplifier which allows it to be used with systems containing Automatic Link Establishment (ALE) and multi-frequency networks operating in a selective calling scan group.
The radiation pattern of the 2018 antenna has low angle nulls toward each side of the vehicle, effectively reducing noise from adjacent power lines which commonly affect vehicles driving on remote roads that have high voltage distribution lines in close proximity.
As the 2018 predominantly radiates RF energy towards the ionosphere it is without doubt the best type of antenna for vehicular NVIS (Near Vertical Incidence Skywave) operations and is effective in overcoming the skip zone common in whip based antenna systems providing superior operation in the range 30 – 150 km. For the same reason the 2018 antenna is highly effective for communication in mountainous areas.
Mounting hardware sets are available to suit most types of vehicles, including Land Rover Discovery, Toyota Land Cruiser, Toyota Prado, Nissan Patrol and Mitsubishi Pajero. Custom brackets can be made for all types of vehicles.
MIL-STD 810G (immersion). Fitted with a pressure equalising breather to equalise pressure without allowing the ingress of moisture.
MIL-STD 810G Method 516.6 for shock
MIL-STD 810G Method 514.6 for vibration
MIL-STD 810G Method 510.5 for dust