Mobile NVIS Loop Antenna
The Loop Antenna has been designed and manufactured to meet the requirements of NVIS HF mobile communications for both on-road and off-road vehicles, and has been designed to meet the requirements of Mil-810 C, D, and E. High conductivity copper tubing is used in the loop element to provide high communication efficiency, and a custom-modified electronic tuner is used to provide a 50 ohm nominal termination impedance at all operating frequencies. The termination arrangement is hermetically sealed to IP66 specifications.
Following initialisations, where the tuner unit memorises each operating frequency used by the HF transceiver, each subsequent tune operation is completed within 10 mS. As such, it is inherently compatible with virtually any HF transceiver over the operational frequency range and power rating with no separate channel control required to the antenna.
There are two models of the NVIS Loop antenna.
- Manual Folding Loop
- Motorised Folding Loop (please call for further details on this product)
Motorised Folding NVIS Loop Antenna
Is the Motorised Loop easy to operate..?
YES!! There is no need to get out of the vehicle to operate this antenna. The antenna is operated by a handheld controller with an optional dash mount available. To deploy the antenna for NVIS use, all it takes is a press of the green button. Taking only 5 seconds to locate into the vertical position and 5 seconds to retract, retraction is a simple reverse process by pressing the red button once.
Motorised and Manual Folding Loop Specification
| Frequency Range | 3.0 - 15.0 MHz |
| Fitted Weight Folding / Motorised | 13kg / 23kg |
| TX Power Input Range | 1.5-200 Watts PEP |
| Continuous TX CW/Data Power | 80W |
| Number of operating channels | Unlimited |
| Non-Volatile Channel Memory Addresses | 170 (165 TX, 5 RX) |
| Input Impedance Range | 45-55 ohms |
| VSWR | Typically less than 2:1 when tuned, (3:1 max) |
| DC Operating Range | +10.0V to 15.6V DC, (+13.8 V DC nominal) |
| DC Current | 230 mA average |
| Initial tuning response time (initial memory setting only) | Typically less than 2 sec per channel |
| Recurrent tuning response time (on-air use inc. freq hopping) | Typically less than 10 ms per channel |
| Operational Temperature | -35° to +70°C |
| Control cable | Standard 50 ohm coaxial cable plus 13.8V nominal DC feed |