Fixed NVIS Loop Antenna
Fixed NVIS Loop Antenna

Fixed NVIS Loop Antenna

Like the mobile loop, the fixed station loop is 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.

SMC have two versions of fixed station loop antennas available, which operate on both NVIS and long-distance sky-wave propagation modes across 3-30MHz:

• A wire element loop with 3m sides
• A solid element loop with 2.5m sides

Both offer similarly high efficiencies. These are ideal for use where space is limited, and rival the performance of much larger wideband HF wire antennas.

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.

Loop antenna
TX Power Input Range
Continuous TX CW/Data Power
Number of operating channels
Non-Volatile Channel Memory Addresses
Input Impedance Range
DC Operating Range
DC Current
Initial tuning response time (initial memory setting only)
Recurrent tuning response time (on-air use inc. freq hopping)
Operational Temperature
Control Cable
1.5-200 Watts PEP (3-500w PEP version also available)
80W (200w for 500w PEP version)
170 (165 TX, 5 RX)
50 ohms
Typically less than 2:1 when tuned, (3:1 max)
+10.0V to 18.5V DC, (+13.8 V DC nominal) 24V DC nominal also available on request
900 mA average
2 – 20 sec per channel
Typically less than 10 ms per channel
-35° to +70°C
Standard 50 ohn coaxial cable plus DC feed 3m in length

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