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HF loop antenna, NVIS, shipboard, 2 m, 1.6-30 MHz


The HF230L-N is a compact HF antenna for naval applications operating over a frequency range of 1.6 to 30 MHz. It is designed to provide superior Near Vertical Incident Skywave (NVIS) performance at distances from 0 to 500 km compared to a 10 m whip and allows continuous communications in ground-wave, NVIS and skywave applications.

The HF230L-N is a magnetic dipole antenna which can be placed at any appropriate top-side position on the ship. The magnetic characteristics of the antenna means the antenna has a far superior signal-to-noise ratio compared to whip antennas as it decoupled from the near field electrostatic noise sources.

This compact antenna is recommended for multiple antenna top-side applications, both because of its small size and because it reduces co-site interference with all V/UHF whip antennas.

The HF230L-N has been designed to give superior performance and easier installation at a far lower cost compared to other naval HF NVIS antennas.

Frequency Range 1.6-30 MHz
Impedance 1 to 1000 Ω
50 Ω nominal
Power Rating 500 W PEP and average
Gain -10 dBi @ 3.5 MHz
-4 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, 7pin 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 Double 20 mm aluminium radiating element with 8 support rods. Enclosure made from fibreglass.
Size Enclosure: 80 x 40 cm (H x W)
Radiating loop: 2 x2 m
Weight Total: < 40 kg
Wind Rating 55 m/s = 201 km/h
Finish Polyurethane lacquer, normally grey
Environmental Test Method: Per MIL-STD-810F
Shock and Vibration: Ship
Water Resistance: IP67
Temperature Range: – 40°C to + 71°C
Installation See Datasheet
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