VHF transmitter NL 60

for aircraft

Overview
Nautel's NL Series is a compact, fully solid-state LF PNT transmitter platform providing eLORAN-capable timing and navigation transmission with advanced pulse and modulation control. The platform is designed for scalable power from tens of watts to more than 1 MW while minimizing site footprint and operational complexity.

Key Features

• Precise, software-definable pulse and modulation control with exceptional pulse stability.
• High overall efficiency (typically ~70% or better) using a patent-pending pulse power recovery technique.
• Scalable architecture: from tens of watts to >1 MW to support higher pulse rates and advanced modulation.
• Lightweight, hot‑swappable redundant power amplifiers with front-panel access; active spares increase system availability.
• Dual Ethernet ports for full monitoring of system and LRU parameters, status and alarms; enables LRU-level fault diagnosis while operational.
• Class-leading space efficiency, typically one third the size of comparable solid-state high-power LF PPM transmitters.

Models — Scalability from tens of watts to more than 1 MW
The NL Series supports proven Nautel combining techniques to scale peak power beyond 1 MW. Low-power variants enable cost-effective coverage-gap deployments while higher-power configurations support advanced pulse rates and modulation formats.

Pulse Power Recovery and Efficiency
The platform uses a Class D RF amplifier architecture with Nautel’s patent-pending pulse power recovery technique to capture energy normally lost in the antenna system, delivering high efficiency independent of antenna height and reducing cooling requirements.

Pulse and Modulation Control
Advanced DSP-based control provides software-definable pulse shaping and modulation, with pulse optimization to compensate for antenna resistance changes and to enable current and future modulation schemes.

Redundancy and Serviceability
Redundant hot-swappable power amplifiers allow continued transmission without altering pulse shape, timing or data. PA modules are replaceable without special tools and without interrupting transmission.

Resilient PNT and Sovereign Control
When deployed in terrestrial networks, NL Series eLORAN transmitters deliver sovereign control of navigation and timing, increased tolerance to interference and a complementary co-primary capability to satellite systems.

Technical specifications

• Product family: NL Series (eLORAN / LF PNT transmitter platform)
• Transmitter architecture: Fully solid-state, Class D RF amplifier building blocks
• Scalability: From tens of watts to >1 MW (platform supports combining techniques)
• Efficiency: Typically ~70% overall (patent-pending pulse power recovery)
• Pulse control: Software-definable pulse shape and modulation via advanced DSP; pulse optimization for antenna resistance changes
• Redundancy: Lightweight, hot-swappable redundant power amplifiers; active spare amplifiers available
• Monitoring & control: Dual Ethernet ports; full monitoring of system and LRU parameters, status and alarms; fault diagnosis to LRU level while operational
• Space efficiency: Typically one third the size of comparable solid-state high-power LF PPM transmitters
• Applications: eLORAN / LF PNT, resilient PNT networks, coverage-gap solutions, high pulse-rate / advanced modulation capability
• Documentation: Spec sheet available for NL60 transmitter (refer to product literature for detailed electrical/mechanical specifications)