- NVIS Loop Series (PDF)
Mobile NVIS Loop Antenna
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 (Near Vertical Incidence Skywave) 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.
|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|