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.

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SpecsInformation
TX Power Input Range1.5-200 Watts PEP (3-500w PEP version also available)
Continuous TX CW/Data Power80W (200w for 500w PEP version)
Number of operating channelsUnlimited
Non-Volatile Channel Memory Addresses170 (165 TX, 5 RX)
Input Impedance Range50 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 900 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
Control Cable Standard 50 ohn coaxial cable plus DC feed 3m in length