Product Info
Antenna Type:
Helical antenna, hemispherical radiation pattern, right-hand circular polarization
Frequency Bands:
Transmit: 1626.5–1646.5 MHz; Receive: 1530.0–1545.0 MHz
Integrated Modules:
Built-in GPS receiver for positioning data, supporting LRIT/SSAS functions
Installation:
Single coaxial cable connection, suitable for mast/deck mounting
Environmental Rating:
High waterproof and dustproof design, resistant to salt spray, humidity, and extreme temperatures (-35°C to +55°C)
Durability:
Withstands 25mm ice loads and 100mm/h heavy rainfall
Functions & System Composition
1. Communication & Distress Safety
Transceiver for Inmarsat-C signals, supporting two-way telex/short message communication, distress alerting, and polling functions.
Works with the indoor terminal unit (NTF-781GM) to send one-click distress signals to maritime rescue centers worldwide.
2. Vessel Security Compliance
Provides GPS positioning data to meet the requirements of LRIT (Long-Range Identification and Tracking) and SSAS (Ship Security Alert System).
3. Full System Configuration
A complete JUE-85 system consists of three main parts:
External Antenna Unit (EME): NAF-253GM5 (the device shown in your images)
Indoor Terminal Unit (IME): NTF-781GM (with distress button and operation interface)
Optional accessories: Power supply unit, message terminal/printer
Industry Notes
NAF-253GM5 vs. NAF-741GM: Both are antenna units for the JUE-85 system. The NAF-253GM5 is the classic helical antenna design, while the NAF-741GM is a later compact version. They share the same core functions and specifications, with only minor differences in appearance and installation details.
Market Position: The JUE-85 is a benchmark Inmarsat-C terminal, renowned for its high reliability and stability, and remains the primary choice for many vessels today.
