NAUTEL NX50 AM TRANSMITTER

148.780,00

With power outputs of 3 kW to 2000 kW, the NX Series sets a new standard for digital performance, rugged design and operational ease in MW transmitter design. Add AM digital precorrection, 86%* efficiency plus an intuitive web interface, and the result is the most advanced medium wave transmitter available today.

The building block of the NX Series is an integrated RF amplifier/modulator with a carrier power capability of 2,500 W. These power modules are hot pluggable from the front of the transmitter making service easy. The Class-D RF amplifier uses four transistors that can be replaced using only a screwdriver. Due to advances in amplifier technology, this amplifier is so efficient (98%) that it is capable of operating at over 10 kW continuously. This power capability results in very low transistor junction temperatures assuring robust operation even in the highest ambient temperatures.

NX50 Specifications:
GENERAL:
• Transmitter Type: Medium wave, AM, 100% solid state
Configuration:
• 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
RF Load VSWR:
• 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
AC INPUT:
• 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

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