Nautel J1000 – 1kW AM Transmitter

Nautel logo



Great things really do come in small packages

The J1000 transmitter provides excellent functionality and flexibility for the broadcaster. The advanced PDM modulation correction and automatically adjusted power supply operation voltages yield low distortion figures from 10 watts to 1100 watts. Direct digital synthesis technology ensures a pure and stable RF carrier frequency that can be interfaced to a GPS reference. The transmitter features a simple bandpass RF filter network with ferrite-tuned inductors and a frequency synthesizer with dialup frequency selection, allowing quick tuning to a new carrier frequency. With its compact size and ease of frequency change, the J1000 is an ideal solution for a mobile back up transmitter.


Save Money

  • A value-priced, high-quality transmitter with traditional Nautel reliability
  • High operating efficiency reduces power bills
  • Compact design reduces shipping costs

Save Time

  • Next business day shipment from Nautel factory
  • Six preset RF power levels can be programmed to automatically meet your power allocations throughout the day, every day of the year, allowing unattended operation
  • Set and check critical parameters using the convenient graphic user interface
  • A diagnostic flow diagram simplifies troubleshooting and maintenance

Save Space

  • Mounts in a standard 19″ rack
  • Only 13U (22.75″) total height

Sound Great

  • A universal switch mode power supply automatically adjusts operating voltage to maintain optimal performance at any power level
  • A synthesized exciter with advanced DDS technology ensures the best possible signal quality
  • Use an external GPS reference clock signal with the J1000 controller for synchronous operation
  • Go digital any time just add an HD Radio or DRM signal

Technical Specification

Transmitter Type

  • Medium Wave, 100% solid state


  • Two 500 W RF power modules each including eight broadband RF amplifiers and four modulators

RF Output Power

  • Rated : 1,000 W
  • Range: 10 W to 1,100 W
  • Six preset levels, selected locally or remotely

RF Output Connection

  • Type N

RF Output Impedience

  • 50 ohms, unbalanced


  • 75%

Frequency Range

  • 531 kHz to 1,690 kHz (supplied to one frequency as ordered)

Frequency Stability

  • Internal: ±2 ppm over temperature range
  • External: GPS 10 MHz dependent on external source

Modulation Capability

  • 125% positive peak modulation at rated power

Incidental Quadrature Modulation

  • 36 dB below 95% modulation at 1,000 Hz

Spurious and Harmonic

  • -73 dB relative to carrier


  • 170 – 270 V ac, 1 phase, 50 Hz or 60 Hz

Power Consumption

  • 1,430 W maximum at 1 kW, 0% modulation
  • 2,140 W maximum at 1 kW, 100% modulation

Temprature 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


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


  • 58 cm H x 48 cm W x 51 cm D
  • (23″ H x 19″ W x 20″ D)


  • 23 kg (50 lbs)

Frequency Response

  • +0.2 dB/-0.8 dB, 30 Hz to 10,000 Hz.

Total Harmonic Distortion

  • Better than 0.8% (THD), 30 Hz to 10,000 Hz at 95% modulation. Referenced at 1,000 W.
  • Better than 1.2% (THD), 30 Hz to 10,000 Hz at 95% modulation. Referenced at 100 W.
  • Reduced antenna bandwidth may degrade specification.

Carrier Shift

  • 0.5% or less

Hum and Noise

  • 65 dB or more below 100% modulation

Frequency Response

  • +0.2 dB/-1.5 dB, 30 Hz to 15,000 Hz.
  • Referenced at 1 kHz

Total Harmonic Distortion

  • Better than 1% (THD), 30 Hz to 15,000 Hz at 95% modulation. Referenced at 1 kHz

Incidental Quadrature Modulation

  • 35 dB or better (typical), 30 Hz to 15,000 Hz

Product Resources

Comments are closed.