125W/250W NDB Transmitters

The Nautel Vector 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.
Automatic resistance matching for higher system availability.
Sophisticated graphic user interface (GUI) for easy maintenance and troubleshooting.
Available in single or dual (main/standby with automatic changeover) configurations.
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 command/control and monitoring 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.
Optional control/monitoring of NDB site.
Compliant with the specifications and recommendations of ICAO Annex 10, Vol. 1, Part 1, Section 3.4.
CE certified.
High overall efficiency (70% or better) results in low power consumption and reduced operating costs.

Description

Constant Field Strength Output for Higher System Availability

The transmitter and ATU-LP 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 NDB systems.

Automatic Resistance Matching for Higher System Availability

The ATU not only automatically matches the capacitive portion of the antenna impedance using dual astatically wound loading coils but also automatically matches a +/-2:1 (4:1 overall) change in the resistive portion of the antenna impedance.

This feature virtually eliminates seasonal visits to NDB sites to re-tap the traditional fixed-tapped matching transformers and is unique to Nautel ATUs.

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 NDB without the need for a local computer or laptop.

The extensive built-in automatic fault monitoring, self-test (BITE) and 256 event log is easily accessible via the GUI for faster troubleshooting.

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