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Armstrong X-1000B Original price was: €17,535.Current price is: €16,700.

Armstrong X-500B

500W AM Transmitter

The Armstrong X-500B is built with a single 600 Watt RF module capable of 150% modulation, and can bring that major market sound to your radio station.

Original price was: €13,475.Current price is: €12,835.

SKU: 101997


Armstrong X-500B AM Transmitter: Compact and Efficient 500W Power


The Armstrong X-500B is a state-of-the-art, solid-state AM transmitter delivering 500 watts of power with HD Radio support. Designed for high-quality audio, low maintenance, and optimized multiphase modulation, this transmitter ensures efficiency and reliability for all broadcasting needs.

Key Features:

Space-Efficient Design

  • Robust Aluminum Chassis: Ensures durability and easy integration into broadcasting setups.
  • Compact Size: Fits into a standard 19″ rack, occupying just seven rack spaces (12.25″).

Modular Configurations

  • Hot-Pluggable 600-Watt Module: Offers flexibility with three preset power levels adjustable in the field.
  • Adaptable Power: Ideal for full power as well as pre-sunrise/post-sunset power adjustments.

Remote Control Capability

  • DB 25 Connector: Provides complete remote control via a rear-mounted DB 25 connector for easy operation and management.

HD Radio Compatibility

  • External RF Input: Compatible with HD Radio technology, allowing seamless integration with digital broadcast systems.

Main Features:

High RF PA Efficiency

  • Over 90% Efficiency: Ensures effective power utilization and minimizes energy wastage.

Multiphase Modulation

  • Optimized Modulator: Features flat group delay and low source impedance, enhancing modulation quality.

Modulation Capabilities

  • Up to +150% Positive Modulation: Provides additional modulation headroom for optimal signal quality.

Redundant and Reliable

  • Hot-Pluggable 600-Watt RF Module: Ensures reliability and headroom.
  • High-Efficiency Switching Power Supply: Guarantees consistent operation.

Compact and Future-Ready

  • Adaptable Design: Ready for the new digital IBOC signal and future broadcasting requirements.


Power Output:

  • X-1000B: 1KW (rated), 1,200W (capable)
  • X-500B: 500W (rated), 600W (capable)
  • Adjustability: Continuously adjustable with three power level presets

Frequency Range: 530kHz to 1700kHz
Output Impedance: 50 ohms unbalanced, Type PL259
Modulator Type: Pulse Duration Modulation (PDM)
Audio Frequency Response: ±0.5dB, 30-10,000Hz
Square Wave Overshoot: 2% at 400 Hz
Square Wave Tilt: 3% or less at 40Hz
Audio Harmonic Distortion: Better than 1% (THD) at 95% modulation 30-10,000Hz (reduced antenna bandwidth may degrade specifications)
Audio Intermodulation: 1% or less at 1KW 60/7000Hz 4:1 ratio SMPTE Standards Distortion at 85% modulation
Modulation Capability: 150% (rated), 165% (capable)
Carrier Shift: Not to exceed 1%
RF Harmonics: 73dB or more below 1KW
Spurious Outputs: 73dB below 1KW
Noise and Hum: 60dB or more below 100% modulation at 1KW
Frequency Stability: ±5 ppm
Audio Input: 600 ohms active balanced +10dBm nominal
Power Input: 190-260 VAC, single phase

Power Consumption:

  • X-1000B: 1400W at 1KW 0% modulation, 1750W at 1KW 100% continuous sine wave modulation
  • X-500B: 600W at 500W 0% modulation, 900W at 500W 100% continuous sine wave modulation

Remote Control/Monitor: DB25 Connector

Mechanical and Environmental Specifications:

  • Ambient Temperature: -10°C to 50°C
  • Humidity Range: 95% max, non-condensing
  • Altitude: 8,000 feet
  • Size: 12.25” high x 19” wide x 20” deep
  • Weight:
    • X-1000B: 132 lbs
    • X-500B: 98 lbs


The Armstrong X-500B is a highly efficient and flexible broadcasting solution. It combines power, efficiency, and future-ready features to optimize performance, ensure reliability, and integrate seamlessly with digital broadcasting technologies.