The FURUNO IC-118 ANT UNIT is a high-performance, omni-directional antenna unit engineered for robust and reliable satellite communication in demanding marine environments. It forms the external, vessel-mounted part of the Furuno FELCOM 18 Inmarsat-C system, which is a vital communication terminal primarily used for Global Maritime Distress and Safety System (GMDSS) applications, as well as general two-way data and telex communication at sea.
Technical Specification
- Antenna Type: Daisy loop antenna (Omni-directional)
- Frequency Range:
- Transmit (TX): 1626.5 MHz to 1646.5 MHz
- Receive (RX): 1537.0 MHz to 1544.2 MHz
- Channel Interval: 5 kHz
- G/T (Gain-to-noise temperature ratio): Better than -23 dB/K (at elevation angle 5°)
- EIRP (Equivalent Isotropically Radiated Power): 12 to 16 dBW (at elevation angle 5°)
- Modulation: BPSK (Binary Phase Shift Keying)
- Modulation Rate: 600 / 1200 sps (symbols per second)
- Coding: Convolution with coding rate 1/2 and constraint length 7
- Decoding: Viterbi decoder
- Polarization: Right-hand circular polarization
- Axial Ratio: Within 6 dB (from 5° to 90° elevation)
- VSWR (Voltage Standing Wave Ratio): 2.0 or less (50 ohm)
- Receiving Gain: 33 to 40 dB
- Receiving NF (Noise Figure): 1.7 dB or less
- Transmitting Gain: 28.5 to 42.5 dB
Environmental Conditions:
- Operating Temperature: -35°C to +55°C (Antenna unit)
- Storage Temperature: -35°C to +70°C (Antenna unit)
- Relative Humidity: 95% or less at +40°C
- Degree of Protection (IP Rating): IP56 (Antenna unit) – meaning it’s protected against dust ingress and strong jets of water.
- Vibration: Complies with IEC 60945 Ed.4 standards for maritime navigation and radio communication equipment.
Physical Characteristics:
- Dimensions:
- Diameter: 156 mm (6.14 inches)
- Height: 258 mm (10.16 inches)
- Weight: 1.4 kg (approximately 3.09 lbs)
- Color: Upper: N9.5 (likely a light grey/white), Lower: 2.5PB3.5/10 (likely a blue-grey)
Power Supply:
- Power is supplied to the IC-118 via the FELCOM 18/19 Terminal Unit (IC-218 or IC-219). It does not have a separate power input.
System Compatibility:
- Designed as an integral part of the Furuno FELCOM 18 and FELCOM 19 Inmarsat-C Mobile Earth Station systems.
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