Nautel XR3 – 3kW AM Transmitter (Single Phase)

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Summary

Summary

The XR3 and XR6 extend the XR series AM transmitters from 3 kW to 12 kW with full module compatibility. Tens of millions of hours of real world operational experience is reflected in the design and construction of the XR series. The result is unparalleled performance and reliability.

Features

Features

  • RF output power: 3 kW rated, 3.75 kW capable
  • 140% positive peak modulation at 3 kW
  • 1.5:1 VSWR at 3 kW, 100% modulation
  • Broadband, plug-in RF amplifiers
  • Dual RF exciters and modulation encoders with automatic changeover
  • Synthesized exciter uses advanced DDS technology to produce RF drive at the desired operating frequency. For synchronous operation an external input is provided for a 10 MHz precision GPS reference clock.
  • High overall efficiency (83% typical) results in low power consumption (5.4 kW maximum at 3 kW, 100% modulation) and reduced operating costs
  • Dimensions: 184 cm H x 58.4 cm W x 80.5 cm D (72.5″ H x 23″ W x 31.7″ D)
  • Weight: 329 kg (725 lbs)

Technical Specification

Technical Specification

Transmitter Type

  • Medium wave, 100% solid state

Configuration

  • Eight broadband RF amplifiers and four modulators mounted in a plug-in RF Module
  • Dual DDS exciters and modulation encoders.
  • Full automatic changeover
  • Second redundant spare module with full automatic changeover (optional)

RF Output Power

  • Maximum: XR3 – 3.75 kW
  • Range: XR3 – 50 W to 3.75 kW
  • Six programmable preset power level profiles, selectable locally or remotely

RF Output Connection

  • 7/8″ or 1 5/8″standard

RF Output Impedance

  • 50 ohms, unbalanced

Efficiency

  • 83% typical

RF Load VSWR

  • XR3 – 500 peak reflected watts 1.5:1 VSWR at 3 kW, 100% modulation
  • XR6 – 1,000 peak reflected watts 1.5:1 VSWR at 6 kW, 100% modulation

Frequency Range

  • 531 kHz to 1,710 kHz. Supplied, tuned and tested to one frequency as specified

Frequency Stability

  • ±2 ppm over temperature range.
  • External GPS for increased stability

Modulation Type

  • Nautel Wideband Interphase Pulse Duration Modulator

Modulation Capability

  • 155% positive peak modulation at 2.5 kW
  • 145% positive peak modulation at 3 kW
  • 120% positive peak modulation at 3.75 kW

Spurious and Harmonic

  • Exceeds FCC, IC and ITU requirements 80 dB relative to carrier

Voltage

  • 200 to 260 V ac, 1 phase
  • 50 Hz or 60 Hz to customer specifications

Power Supply Variation

  • ±10% voltage, 47 Hz to 63 Hz

Power Consumption

  • 3.0 kW typical at 2.5 kW, 0% modulation
  • 4.5 kW typical at 2.5 kW, 100% modulation
  • 3.6 kW typical at 3 kW, 0% modulation
  • 5.4 kW typical at 3 kW, 100% modulation

Power Factor

  • 0.85 typical, 1 phase

Temperature Range

  • 0°C to +50°C
  • Derate 3°C per 500 m above sea level (2°C per 1,000 ft)

Humidity Range

  • 0% to 95% non-condensing

Altitude

  • 0 m to 3,000 m (0 ft to 10,000 ft)

Cooling Air Requirements

  • 340 m3/hr (200 CFM)

Dimensions

  • 184 cm H x 58.4 cm W x 80.5 cm D
  • (72.5” H x 23” W x 31.7” D)

Weight

  • XR3/XR6 – 1 Ph – 223 kg (493 lbs)

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