NVIS Loop Antenna Mobile
Traditional vertical ‘whip’ antennas fitted to vehicles for high-frequency communication suffer from a ‘skip zone’, where little or no communication is obtainable in a given area.
The SMC Mobile HF Loop Antenna, developed for NVIS communication across 3-15MHz, overcomes these limitations by having high radiation efficiency and no skip zone whatsoever.
Capable of automatically tuning across its frequency range in less than a 50th of a second, it is compatible with virtually any HF transceiver including frequency hopping types without the need for a separate control.
Based on the tried and tested SMC mobile NVIS loop which is in use by organisations throughout the world, this latest version incorporates a significant upgrade to ruggedized thick-walled tubing for performance and durability.
Other versions are available for:
- Vehicle roof-bar fitment with a ‘fold-down’ facility
- Side mounting on the vehicle.
The standard loop roof bar attachment is designed for roof bars 32mm x 22mm in cross section. However attachments can be manufactured to suit your individual requirement.
In receive mode, for non-scanning/frequency hopping modes the antenna is factory-set to automatically store its tuning settings for the last tuned transmit frequency for greater receive efficiency. However, if pre-defined by the user upon ordering it may alternatively be factory-set for the loop to operate ‘un-tuned’ in receive mode to allow wide-band reception for scanning modes such as ALE (Automatic Link Establishment) reception.
| Specs | Information |
|---|---|
| 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 | 50 ohms |
| VSWR | Typically less than 2:1 when tuned, (3:1 max) |
| DC Operating Range | +10.0V to 18.5V DC, (+13.8 V DC nominal) 24V DC nominal also available on request |
| DC Current | 230 mA average |
| Initial tuning response time (initial memory setting only) | 2 - 20 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 |
| Coaxial Cable | RG58 5m in length |
| Power Cable | 2 Core screened, 5m in length |