PRE OWNED JRC NAF-741GM 85C JRC NAF-741GM 85C MARINE ANTENA

The JRC NAF-741GM is the primary antenna unit (Externally Mounted Equipment) for the JUE-85 (and JUE-85C) Inmarsat-C GMDSS station. It is a highly respected legacy antenna in the Bhavnagar market, known for its "all-weather" reliability and simple single-cable installation.

JRC NAF-741GM INMARSAT-C EME (FOR JUE-85 / 85C)

PRODUCT OVERVIEW

The JRC NAF-741GM is a high-gain, helical antenna designed for global satellite messaging and GMDSS distress signaling. As the outdoor unit for the JRC JUE-85 series, it is engineered to maintain a constant link with Inmarsat satellites through a wide 360-degree horizontal and hemispherical vertical pattern.

This model is particularly valued for its "Class 2" Inmarsat-C capabilities, meaning it handles both message transmission and EGC (Enhanced Group Calling) reception simultaneously. Its robust design is built to survive the high-vibration and corrosive environments of commercial cargo ships, tankers, and deep-sea fishing vessels.

TECHNICAL SPECIFICATIONS

-- Model: JRC NAF-741GM (Externally Mounted Equipment)

-- System Compatibility: JRC JUE-85 / JUE-85C Inmarsat-C

-- Antenna Type: Helical (Hemispherical Pattern)

-- TX Frequency: 1626.5 MHz to 1646.5 MHz

-- RX Frequency: 1530.0 MHz to 1545.0 MHz

-- GPS Frequency: 1575.2 MHz (+/- 1 MHz)

-- G/T Ratio: -23.7 dB/K minimum (at 5-degree elevation)

-- E.I.R.P.: 14 dBW (+/- 2 dB)

-- Power Consumption: 100W (TX) / 15W (Standby)

-- Operating Temp: -35C to +55C (EME Unit)

-- Wind Resistance: Up to 100 knots (50 m/s)

-- Weight: 1.5 kg (including mounting bracket)

KEY FEATURES & APPLICATIONS

-- GMDSS Store-and-Forward: Fully compliant with IMO/SOLAS standards for Sea Areas A1, A2, and A3, allowing for secure distress alerting and safety messaging.

-- Integrated GPS: Features a built-in GPS antenna element to provide automatic vessel position, course, and speed data for polling and distress reports.

-- Single Coaxial Connection: Power, TX, RX, and GPS signals are all multiplexed over one cable, greatly simplifying the mast-top installation.

-- SafetyNET & FleetNET: Supports all EGC services, ensuring the bridge receives vital maritime safety information (MSI) and commercial broadcasts.

-- Durable Radome: The UV-stabilized helical radome is designed to resist heavy icing (up to 25mm) and high-intensity precipitation (100mm/hour).

-- Legacy Versatility: While optimized for the JUE-85C, it is a versatile spare for many JRC satellite installations found in the refurbished market.

TYPICAL CONDITION (USED/REFURBISHED)

When sourcing NAF-741GM units from ship-recycling yards, we perform a strict performance check. This includes verifying the "BPSK" modulation quality and testing the G/T (gain-to-noise) ratio to ensure the internal LNA is still performing at factory levels. We also check the pole-mounting bracket for structural integrity and ensure the N-Type coaxial connector is free of salt-water ingress.

COMPATIBLE BRAND MODELS:

JRC (JUE-85, JUE-85C, JUE-87, NTF-781GM, NAF-253GM, NAF-742), Furuno (FELCOM 15, IC-115, FELCOM 12, IC-112), Thrane & Thrane / Sailor (TT-3005M, TT-3020C, Sailor 6110), Cobham (Sailor 6110), Samyung (SN-100), Skanti (Scansat-700), Nera (WorldClass C).

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