NAVTEX Transmitters

VR750TT/VR1500TT/VR3000TT 750W/1500W/3000W

Vector Series NAVTEX Transmitters

Since introducing the world’s first totally solid state, high power radio beacon in 1970, Nautel has supplied the highest quality and reliability in solid state LF/MF/HF and VHF transmission systems around the world.

The most recent Vector Transmitters and Antenna Tuning Units for the MF NAVTEX shore stations continue this heritage and provide a dramatic improvement in system coverage.


The Nautel Vector NAVTEX System offers a unique, patented solution to maintain system coverage regardless of undesirable antenna effects such as salt build-up on antenna insulators and ground plane resistance changes.

Highlights include:

  • Constant field strength output for higher system availability.
  • Sophisticated graphic user interface (GUI) for easy maintenance and troubleshooting.
  • Dual channel (490 kHz and 518 kHz) operation.
  • Synthesized exciter uses advanced DDS technology to produce highly stable RF drive at the desired operating frequency.
  • Extensive automatic fault monitoring, with 256 event log, for faster troubleshooting.
  • Extensive remote control/monitoring and diagnostics for fewer site visits.
  • Remote control and monitoring of the ATU to limit worker exposure to strong RF fields, in keeping with Safety Code 6 / IEEE C95.1-1999.
  • Designed with intent to comply with CE requirements.
  • High overall efficiency (70% or better) results in low power consumption and reduced operating costs.
  • 170 – 270 Vac Switch Mode Power Supplies.
Constant Field Strength Output for Higher System Availability

The transmitter and ATU communicate via a serial data bus that allows the transmitter to monitor the antenna current.

The transmitter can automatically (user enabled feature) adjust its output power to maintain a constant antenna current, thereby maintaining constant field strength of the radiated signal.

This feature is unique to Nautel Vector systems.

Sophisticated GUI for Easy Maintenance and Troubleshooting

Located on the front panel of the transmitter, the GUI allows for set-up, control and monitoring of the transmitter without the need for a local computer or laptop.

The extensive built-in automatic fault monitoring and 256 event log is easily accessible via the GUI for faster troubleshooting and diagnostics to the Lowest Repairable Unit (LRU).

Synthesized Exciter with Advanced DDS Technology

A synthesized exciter uses advanced Direct Digital Synthesis (DDS) technology to produce highly stable RF drive at the desired operating frequency.

This state-of-the-art technology provides the dual frequency (490 kHz and 518 kHz) RF Drive with a frequency stability of ± 0.0003% over the full environmental range. The DDS also generates FSK at the necessary baud rates which are well within the requirements of ITU-R SM.328-11 and ITU-R SM.329-10.

Remote Control & Monitoring of ATU to Limit Worker Exposure to Strong RF Fields

The ATU-HP-TT may be controlled and monitored via the GUI to limit the operator’s exposure to the strong RF field of the antenna in keeping with Safety Code 6 / IEEE C95.1-1999.

Extensive Remote Control & Monitoring for Fewer Site Visits

Password-protected remote control and monitoring of the Vector NAVTEX transmitter and ATU-HP-TT is available via the optional VR-Link-TT remote control and monitoring system. System diagnostics and access to the 256 event log are also available via the VR-Link-TT.

The VR-Link–TT, using a text based display, hosts a web page that can be accessed by any standard web browser so no special software is required at the remote PC/laptop. Remote connectivity options include RS-232, RS-422, leased-line, dial-up, radio and GSM/GPRS modems, and Ethernet. The capability is also optionally offered to connect to an existing remote control/monitor system via optically isolated Inputs and form C contact outputs.

High Overall Efficiency (70% or better)

The use of Class D RF amplification and Pulse Duration Modulation (PDM) techniques results in low power consumption and reduced operating costs.

170 – 270 Vac Switch Mode Power Supplies

Eliminate need for user configuration over full ac input range of 170 – 270 Vac.