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The JRC JLN-740N is an IMO type-approved, single-axis Doppler Speed Log designed specifically for commercial vessels requiring standard output distribution. The “N” designation denotes the 3-unit system configuration—omitting the extra distribution processor found on the “A” model—making it a streamlined, space-saving solution for bridge consoles that interface directly with standard navigation networks.
Operating on a high-frequency 2 MHz dual-beam pulse Doppler frequency, the JLN-740N measures Speed Through Water (STW) with extreme precision ($\pm 0.03\text{ knots}$ stability). It incorporates JRC’s proprietary bubble detection system to continuously check transducer face contact and alert operators if aeration interferes with tracking accuracy.
Streamlined 3-Unit Architecture (Model N): Consists solely of the Main Display, Signal Processor, and Transducer Unit—reducing overall system footprint and cable routing requirements.
Dual-Beam 2 MHz Doppler Technology: Uses high-frequency ultrasonic beams to achieve fast, stable speed measurements during both high-speed transit and low-speed berthing maneuvers.
Integrated Bubble Detection: Monitors signal return quality in real time; warns bridge officers if aerated water/hull bubbles compromise accuracy to prevent false system fault troubleshooting.
Color Touch Screen Interface: Features the optional NWZ-510SDW 5.1-inch color touch-panel LCD display (or standard 4.5-inch display) with customizable day/night color schemes and intuitive touch menu navigation.
JRC RMS Ready: Compatible with JRC’s Remote Maintenance System (RMS) over LAN for remote health status monitoring and preventative maintenance reporting.
| Category | Component / Feature | Technical Details |
| System Model | Model Identifier | JRC JLN-740N (3-Unit Standard Configuration) |
| Measuring Principle | System Type | Single-Axis Dual-Beam Pulse Doppler Speed Log (Speed Through Water) |
| Operating Frequency | 2.0 MHz | |
| Water Speed Range | -10.00 to +40.00 knots | |
| Depth Below Transducer | Effective measuring depth $\ge$ 3.0 meters below transducer face | |
| Speed Accuracy | $\pm 1\%$ or $\pm 0.1$ knots (whichever is greater) / $\pm 0.03$ kn / 0.3% at constant speed | |
| Distance Accuracy | $\pm 1\%$ or $\pm 0.1$ NM/hour | |
| Displays & Controls | Main Display Unit | NWZ-510SDW (5.1″ Color LCD, 480 x 800 resolution with Touch Panel) |
| Distance Display Range | 0 to 99,999.99 NM | |
| System Units (3-Unit Set) | Core Modules |
1. Main Display (NWZ-510SDW) 2. Signal Processor (NJC-70S) 3. Transducer Unit (Flat type NKF-547 or Gate Valve type) |
| Interfaces & Connectivity | NMEA Output Ports | 4 x IEC 61162-1 / NMEA 0183 Outputs (VBW, VLW sentences) |
| NMEA Input Ports | 1 x IEC 61162-1 GPS Input (RMC, ZDA) | |
| Pulse Outputs | 2 x Contact Closure Log Pulse Ports (200 pulses/NM) | |
| Network & Remote Ports | 1 x LAN Port (JRC RMS Support), 1 x Remote Display Port | |
| Alarm Outputs | System Fail, Power Fail, and Speed Limit relay contacts | |
| Electrical & Physical | Power Supply Input | 100 / 230V AC $\pm 10\%$ (50/60 Hz) |
| Power Consumption | $\le 50\text{ W}$ (60 VA at 100V / 150 VA at 230V) | |
| Operating Temperature | -15°C to +55°C | |
| Standards & Compliance | Certifications | IMO MSC.96(72) Compliant, MED Wheelmark, IEC 61023, IEC 60945 |
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