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Nautel NX50

50kw AM transmitter


Modern, Efficient, Digital High Power Nautel invented the modern solid state broadcast transmitter over 40 years ago. Five generations of transmitter design know-how have been applied to the NX Series resulting in the most modern and reliable high power transmitters available today. Choose from surprisingly compact standalone transmitter designs with outputs from 3 kW to 400 kW. These discrete transmitters can be combined to achieve power outputs of up to 2 MW.

Main Features:
• Conservatively engineered building block
• High reliability and on-air serviceability
• Industry’s best digital transmitter
• High power combining
• Class-leading space efficiency
• Ease of operation & ownership
• Safety without compromise
• Energy savings and cleaner environment
• Integration services
• Standard power outputs: 3 kW to 400 kW
• Custom systems delivered to 2 MW
• Advanced user interface (AUI)
• Power saving MDCL
• PhoneHome™
• HD MER Instrumentation

NX50 Specifications:
• Transmitter Type: Medium wave, AM, 100% solid state
 • Twenty 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
 • Dual redundant digital single board exciters utilizing FPGA/DSP technology with automatic changeover
 • Pre-correction utilized specifically to improve digital performance
 • Redundant low voltage power supplies
RF Output Power:
 • Maximum: 75 kW RMS
 • Peak Power: 288kW
 Carrier Power Range:
  • Continuously adjustable from 0 to 55 kW in 100 W steps 
  • 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: 3 1/8 EIA female standard, other outputs on request
• RF Output Impedance: 50 ohms, unbalanced
• Efficiency: 90% typical at 50 kW
 • 8000 peak reflected watts (1.5:1 VSWR @ 50 kW, 100% modulation) results in instantaneous power shutback
 • 2000 reflected watts RMS (1.5:1 VSWR @ 50 kW, 0% modulation) results in a graceful power reduction
• Frequency Range: 531 kHz to 1,620 kHz. "Quick frequency change capability"
• Frequency Stability: ±2 ppm over temperature range (Optional 300 ppb ovenized source with GPS option)
Modulation Type:
 • 6 phase direct digital modulation
 • 1.8 MHz modulation sample rate
Modulation Capability:
 • 140% positive peak modulation to 50 kW
 • 130% positive peak modulation to 55 kW
Spurious and Harmonic:
 • 80 dB or more below carrier at 50 kW
 • Meets ITU-R SM.328-10
 • Meets ITU-R SM.329-9
• Voltage: 340 V to 510 V, 3 phase or to customer specifications
• Power Supply Variation: ±10% voltage, 47 Hz to 63 Hz*
Power Consumption:
 • 55.5 kW typical at 50 kW, 0% modulation
 • 85 kW typical at 50 kW, 100% modulation
• Cos (theta): 0.95 typical
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 4,000 m (0 ft to 13,000 ft)
• Cooling Air Requirements: 2,550 m3/hr (1,500 CFM)
• Meets EN60215: 1976 Safety Requirements for Radio Transmitting Equipment

*Please consult a broadcast engineer/BSW to determine if this unit is right for your application and you are meeting all of the appropriate legal requirements. You can review the FCC regulations on LPFM and unlicensed usage below.

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