Nautel NX5 – 5kW AM Transmitter

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Nautel NX5 (thumbnail)



The NX5 stands apart compared to other 5kW AM transmitters on the market today with efficiency of 86%, compact enclosures that are 1/3 to 1/4 smaller, and digital transmission capability.

Front panel control of the new NX5 transmitter is via an easy-to-use LCD display. Like other members of the NX Series, it also includes Nautel’s award-winning Advanced User Interface (AUI). Log in to the AUI on the NX5 using a web browser on your PC or mobile device to gain access to unprecedented instrumentation and control whether you are at the transmitter site, the office or home.



AUI’s functionality includes built-in commercial grade instrumentation, full remote access; SNMP support; an instrument-grade spectrum analyzer and network analyzer; real-time modulation error ratio measurement; monitoring and control including event logging; email and SMS notifications; backup audio via streaming and USB playout; presets and enhanced support services including Nautel Phone Home.

Analog, DRM and HD Radio models are available.

Technical Specification

Technical Specification

Transmitter Type

  • Medium wave, AM, 100% solid state


  • Two RF power modules, each including a single integrated RF amplifier/modulator
  • No frequency dependant parts in RF module
  • Each module is hot pluggable and has internal microcontroller for protection and monitoring over a serial bus
  • Short circuit protection at the module level offers an added layer of protection
  • Optional redundant digital single board exciters utilizing FPGA/DSP technology with automatic changeover
  • Pre-correction utilized specifically to improve digital performance

RF Output Power

  • Carrier Power Range: 0 to 5500 W
  • Up to 62 preset levels, presets may include other operational parameters such as DRM vs Analog and different program inputs
  • Output level stabilized against AC supply voltage variations
  • Built in Dynamic Carrier Control
  • Built in AM stereo

RF Output Connection

  • 7/8″ EIA or 1-5/8″ EIA

RF Output Impedance

  • 50 ohms, unbalanced


  • 86% typical at 5 kW


  • 800 peak reflected watts (1.5:1 VSWR @ 5 kW,
  • 100% modulation) results in instantaneous power shutback
  • 200 reflected watts RMS (1.5:1 VSWR @ 5 kW, 0% modulation) results in a graceful power reduction

Frequency Range

  • 531 kHz to 1,700 kHz.”Quick frequency change capability”

Frequency Stability

  • ±2 ppm/year over temperature range
  • ±0.3 ppm/year with GPS option

Modulation Capability

  • 140% positive peak modulation to 5000 W
  • 130% positive peak modulation to 5500 W

Spurious and Harmonic

  • Meets ITU-R SM.328-11
  • Meets ITU-R SM.329-12


  • 208 Vac & 380 Vac, 3 phase or to customer specifications

Power Supply Variation

  • ±10% voltage, 47 Hz to 63 Hz

Temperature Range

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


  • Forced Air

Humidity Range

  • 0% to 95% non-condensing


  • 0 m to 4,000 m (0 ft to 13,000 ft)


  • Meets EN60215: 1996 Safety Requirements for Radio Transmitting Equipment


  • 184.2 cm H x 62.2 cm W x 81.3 cm D
  • (72.5″ H x 23.1″ W x 34″ D)

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