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HF loop antenna, NVIS, 1.5 m diameter, 2-30 MHz


The HF230L-OTM is a compact HF antenna for on-the-move vehicular platforms from 2 to 30 MHz.  It is designed to provide superior Near Vertical Incident Skywave (NVIS) performance at distances from 0 to 500 km and allows continuous communications in ground-wave, NVIS and Skywave applications.

The HF230L-OTM is a direct replacement for existing whip antennas and uses the same NATO base support.  The replacement of the whip by the HF230L-OTM takes just a few minutes and requires no special installation equipment nor changes to the structure of the vehicle.

This compact antenna is recommended for multiple antenna platforms, both because of its small size and because it reduces co-site interference with all V/UHF whip antennas.  The HF230L-OTM has been designed to give superior reliability and easier installation at a far lower cost compared to other HF NVIS antennas.

Frequency Range 2-30 MHz
Impedance 1 to 1000 Ω, 50 Ω nominal
Power Rating 200 W PEP and average
Gain – 15 dBi @ 3.5 MHz
– 8 dBi @ 10 MHz
Radiation Pattern see Charts Tab
Power Supply 18-32 VDC, normally supplied from power amplifier
Connector 10 mm stud for RF
MIL-C-5015, 7 pin for interface to ATU and supply voltage
Interface The antenna has two digital inputs and one output, and a RS485 serial port.  Software is then configured depending on radio system
Design Copper braided fibreglass collapsible radiating loop.  Feed tower made from aluminium and fibreglass.
Size Tower:   25 x 15 cm (H x Diameter)
Radiating Loop:   150 cm diameter
Weight 7 kg
Wind Rating 55 m/s = 201 km/h
Finish Polyurethane lacquer, normally black.
Radiating element covered with black heat shrink tube.
Environmental Test Method:   Per MIL-STD-810F
Shock and Vibration:   Ground Tactical
Water Resistance:   IP67
Temperature Range:   – 40°C to + 71°C
Installation Standard 4 hole NATO base
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