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Proven AM Performance and Reliability
The XR Series are the fourth generation in an evolutionary process of design improvement that began in 1982, when Nautel introduced the world’s first solid state 10 kW to 50 kW AM transmitters.
Over 20 million hours of real-world operational experience have gone into the design and construction of the XR Series. The result is unparalleled performance and reliability.
POWERFUL BUILDING BLOCKS
The building block for the XR Series is a power module integrating multiple RF amplifier units with a combined output rating in excess of 7.5 kW.
Front mounted modules make for easy servicing.
The individual RF amplifier and modulator units are connected in the power modules using plug-in industry standard “D” connectors and bolted directly to the heat sink.
The XR Series is purposely designed for demanding AM broadcast applications that require reserve power.
This extra power overcomes antenna system losses such as those encountered in complex directional arrays.
It allows aggressive audio processing and high levels of asymmetrical modulation to produce more sideband energy and a louder signal.
Extra power also makes it possible to maintain full power AM transmission while transmitting a digital signal or simultaneous phase coded data.
In addition to a fully redundant exciter section, the option of a spare RF power module is also available on the XR3 and XR6.
This additional power module provides a main/standby configuration with automatic changeover at a very economical cost. Should a power module changeover occur, the module requiring servicing can be safely removed for repair without any interruption in output power.
For even greater on-air confidence, XR transmitters include a complete standby DDS exciter and modulation encoder that automatically takes over when it detects a problem.
The XR Series graphic user interface and soft-keys give you simple menu control of operating modes. Six power level selections are continuously adjustable over the full range using raise/lower commands.
Programmable system profiles let you define schedules for changes to power and modulation settings allowing you to comply automatically with daytime/nightime power levels.
An LED diagnostic status flow diagram continually monitors the system and an advanced control, alarm and 128 event time stamped logging system allows service personnel to easily identify problems.
Optional NxLink extends control beyond the transmitter site to the web.
HD RADIO AND DRM 30 DIGITAL
The XR transmitters have been specifically designed to support HD Radio and DRM digital transmission formats for use on existing AM channels.
Nautel employs an ultra linear extended band filter that maintains an envelope bandwidth of 40 kHz. The RF drive design optimizes IPM to ensure minimal phase error. This provides superior spectral performance when transmitting a digitally encoded signal using digital modulation techniques such as HD Radio and DRM.
Nautel’s solid state Exporter and AM IBOC units permit an easy upgrade path to HD Radio transmission.
UNATTENDED AUTOMATED OPERATION
The XR Series transmitters are built to stay on the air without human supervision.
The transmitters maintain rated power with 100% modulation even with an antenna mismatch of up to 1.5:1 VSWR. With more extreme VSWR, power is automatically reduced to a safe level.
A unique circuit dynamically stabilizes power output against AC line voltage variations. After an AC power loss, overvoltage or RF overload, prior operating status is automatically restored.
Servicing consists of simple exchange, using only a screwdriver.
Component level repair can be performed at the workbench or at a central service depot. These plug-in RF amplifier and modulator units are low cost, and can be economically replaced without the need for troubleshooting.
Ventilation is provided by redundant brushless DC-powered fans mounted in a removable tray below the power modules. Airflow is unaffected by AC supply variations, ensuring cool operation and long term reliability.