Lars Thrane LT-3100 System


The LT-3100 Satellite Communications System is a maritime satellite communication product from Lars Thrane A/S. The LT-3100 system is designed for the professional market (deep sea, fishing, and workboats), but can be used for the leisure market as well. The LT-3100 system meets all standards and certification requirements needed for worldwide maritime satellite communication equipment.


The LT-3100 system has voice and data capabilities with 100% global coverage provided by the Iridium® Communications Network. The LT-3100 system consists of a control unit, antenna unit, handset and cradle. A single coaxial cable connects the control unit with the antenna unit. Using a standard coaxial cable, up to 500 meters of separation between the units can be obtained, giving freedom to mount the antenna unit in the best possible location, with free line of sight to the satellites.

The LT-3100 system can be used as the primary satellite communication product on vessels, covering the basic communication needs in terms of connectivity between the ship and shore. In addition, the LT-3100 system can be used for crew calling or as back-up satellite communication product. The LT-3100 system provides voice, SMS, data, vessel tracking, and other Iridium® services with competitive airtime rates, making it the perfect satellite communication product on board any vessel.

The LT-3100 Satellite Communications System is designed and built for the demanding and rough environment at sea and with an operational temperature range from -25⁰C to +55⁰C (-13⁰F to +131⁰F).


The LT-3100 system is very easy to install and requires no yearly maintenance or service. Everything is included in the box to get started with the installation and operating the LT-3100 system. The control unit can be installed using either a bracket mount or flush mount. The antenna unit can be mounted using either a pole mount (1.5″ tube) or bracket mount (1″ to 2.5″ tube). The control unit has a large 4.3″ TFT-LCD display, from where the system can be operated with overview and ease. The built-in webserver can be used for service and maintenance.

More than 40 years of experience have been put into the design and construction of the LT-3100 Satellite Communications System, with an exceptional performance and specification level.

Technical Specifications & Features

  • Voice, SMS, Data, and Vessel Tracking
  • 2 Kbit/s and 10 Kbit/s Compressed Data
  • Single Antenna Cable Solution (up to 500 m)
  • High-performance GNSS/GPS Receiver
  • High Quality Microphone and Equalizer for Improved Audio Quality
  • Bluetooth Interface Supporting Voice, SMS, and Data
  • Large 4.3” TFT-LCD Display Supporting Day and Night Modes
  • Voice Prompt Audio Feedback
  • Firewall and User Authentication for High Level of Security
  • Webserver for Configuration and Maintenance
  • Support External LAN Wi-Fi Access Point
  • Support External SIP PABX and SIP Handsets
  • Connectivity of Smartphones, Softphones, and Apps

LT-3100 Satellite Communications System

Certification & Standards CE, RED, IEC 60945, IEC 60950, FCC, IC, RoHS, Iridium Communications Inc.
Vibration, Operational IEC 60945 (Sine) & Proprietary Maritime Random Profile
Vibration, Survival Proprietary Maritime Random Profile
Vibration, Shock Proprietary Maritime Profile (20 g, 11 ms)
Power Consumption: Operating Mode, Max 22 W
Power Consumption: Standby Mode, Max 14 W
Power Consumption: Sleep Mode, Max 0.08 W

LT-3110 Control Unit

Weight 658 g (1.45 lbs)
Dimensions 224.0 x 120.0 x 70.0 mm (8.82 x 4.72 x 2.76 in)
Temperature, Operational -15°C to +55°C (+5°F to +131°F)
IP Rating, Dust and Water IP31 (front) / IP30 (back)
Interfaces Ethernet, Auxiliary, DC Input, Chassis Ground, N Conn. (Female), Handset, Bluetooth, SIM Card
Input Voltage 10 – 32 VDC
Compass Safe Distance, std. and Steer. 0.3 m (1 ft)

LT-3120 Handset

Weight 290 g (0.64 lbs)
Dimensions 208.8 x 52.8 x 38.2 mm (8.22 x 2.08 x 1.50 in)
Temperature, Operational -15°C to +55°C (+5°F to +131°F)
IP Rating, Dust and Water IP30
Compass Safe Distance, Std. and Steer. 0.3 m (1 ft)

LT-3121 Cradle

Weight 66 g (0.15 lbs)
Dimensions 106.9 x 57.4 x 29.3 mm (4.21 x 2.26 x 1.15 in)
Compass Safe Distance 0.4 m (1.3 ft)

LT-3130 Antenna Unit

Weight 687 g (1.51 lbs)
Dimensions 151.1 x Ø 149.5 mm (5.95 x Ø 5.89 in)
Temperature, Operational -25°C to +55°C (-13°F to +131°F)
IP Rating, Dust and Water IP67
Interfaces N conn. (Female)
Compass Safe Distance, Std. and Steer. 0.3 m (1 ft)


Antenna Communication Cable Coaxial Cable, Up to 500 m (1500 ft)
Warranty 2-Years
Maintenance None



Partner ProductsLast UpdatedSize
Feb 14, 20181.97 MB
Size: 1.97 MB
File Name: PP_Lars+Thrane+LT-3100_Product+Sheet_v1.02.pdf
Vendor: Lars Thrane A/S
File Type: PDF

Product specification sheet for Lars Thrane LT-3100 maritime satcom system.

Verticals: Maritime
Feb 14, 20182.52 MB
Size: 2.52 MB
File Name: PP_Lars+Thrane+LT-3100_User+Installation+Manual_v1.1.pdf
File Type: PDF

User and installation manual of Lars Thrane LT-3100 maritime satcom system.

Verticals: Maritime
Press Release
Jun 05, 2019197.05 KB
Size: 197.05 KB
File Name: PR_New+Era+Safety+At+Sea_GMDSS+Service_Lars+Thrane_060419.pdf
Vendor: Iridium
File Type: PDF

Press Release concerning the launch of the first Iridium partner product to feature Iridium GMDSS support, dated June 4, 2019.

Products: Lars Thrane LT-3100S GMDSS System
Services: Iridium GMDSS
Verticals: Corporate, Maritime