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The JRC JUE‑251 is a maritime Inmarsat FleetBroadband 250 terminal combining a compact, two‑axis stabilized above‑deck antenna unit (ADU) with an integrated communication earth station. It delivers simultaneous voice and broadband data services—supporting standard IP up to 284 kbps and streaming IP up to 128 kbps—along with SMS capability. The ADU features a flat‑panel or low‑profile antenna enclosure, right‑hand circular polarization, and a beamwidth of approximately 40° (3 dB). Designed to operate across the L‑band, it transmits in 1626.5–1660.5 MHz (and extended 1668.0–1675.0 MHz) and receives in 1518.0–1559.0 MHz. Power is supplied via DC 21.6–31.2 V, with the system drawing less than 160 W under normal load. The terminal supports PoE to attached devices (up to 32 W total). The mechanical design is rugged—adept at withstanding marine environments, with ADU protection rated at IP56 and BDU (below‑deck unit) at IP22. The system is engineered to function under ship motion (roll ±30°, pitch ±10°, yaw ±8°, and heave/surge/sway) and harsh weather loads (icing up to 25 mm, precipitation 100 mm/hr, wind up to 100 knots). The ADU itself weighs approximately 4.7 kg, while the BDU weighs about 4.5 kg. Additional features include a web interface for system management, remote maintenance (RMS), satellite blockage registration (up to 6 blocked zones, e.g. funnel or masts), optional voice distress (non‑SOLAS), multiple Ethernet/VoIP/telephony interfaces, and a single coaxial cable link between ADU and BDU to simplify installation.
System Type: Inmarsat FleetBroadband 250 class
Voice and Data: Simultaneous voice and broadband data
Standard IP Data Rate: Up to 284 kbps
Streaming IP: Up to 128 kbps
SMS: Supported (up to 160 characters)
Transmit Frequency (Tx): 1626.5 – 1660.5 MHz (extended: 1668.0 – 1675.0 MHz)
Receive Frequency (Rx): 1518.0 – 1559.0 MHz
Max EIRP: +15.1 dBW (tolerance +1 / –2 dB)
Antenna Beamwidth (3 dB): Approximately 40°
Polarization: Right-hand circular
G/T (Gain over Temperature): –15.5 dB·K
Input Voltage: 21.6 V DC to 31.2 V DC
Power Consumption (Max): ≤ 160 W
Receive Current: ≤ 2 A
Transmit Current (Peak): Up to 6.5 A
Above Deck Equipment (ADE – Antenna Unit):
Dimensions: Approx. 285 mm (diameter) × 364 mm (height)
Weight: Approx. 4.7 kg
Below Deck Equipment (BDU – Control Unit):
Dimensions: 262 mm (width) × 275 mm (depth) × 65 mm (height)
Weight: Approx. 4.5 kg
Operating Temperature: –25 °C to +55 °C
Storage Temperature: –40 °C to +85 °C
Relative Humidity: Up to 95% at 40 °C (non-condensing)
Icing Resistance: Up to 25 mm of ice on the radome
Wind Resistance (Operational): Up to 100 knots
Precipitation Resistance: Up to 100 mm/hour
Roll: ±30° (period: 8 seconds)
Pitch: ±10° (period: 6 seconds)
Yaw: ±8° (period: 50 seconds)
Heave: ±0.5 g
Surge/Sway: ±0.2 g
Turn Rate: Up to +6°/s
Angular Acceleration: Up to 1°/s²
Antenna Stabilization: 2-axis, fully stabilized
Cable Configuration: Single coaxial cable between ADU and BDU (carries RF, power, and control)
Blocked Area Setup: Can register up to 6 blockage zones (e.g., masts or funnels)
Remote Maintenance System (RMS): Supported
Web Interface: Available for management and diagnostics
Self-Diagnosis: Built-in system monitoring
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