Eddystone S7603

3kW Modular FM Transmitter

The Eddystone S7603 uses 300W hot-pluggable Power Amplifier modules means that removal of amplifiers can be carried out with a minimal reduction in output power.


SKU: 103139


The Eddystone S7603 3kW FM Transmitter continues the tradition of highly modular architecture, efficiency, and ease of maintenance that characterizes Eddystone Broadcast transmitters. Let’s delve into its features and specifications:


  1. Modular Design: Incorporates hot-pluggable Power Amplifier (PA) modules, enabling easy removal and replacement without significant reduction in output power. This modular approach simplifies maintenance and reduces downtime.
  2. Efficient Power Supplies: Utilizes highly efficient hot-pluggable switched-mode power supplies (SMPSU), contributing to ease of servicing and minimizing spares holding costs. Commonality of PA and SMPSU modules across the 7600 range enhances cost-effectiveness.
  3. Compliance: Fully compliant with the ETS 300 384 specification for FM transmitters, ensuring reliability and adherence to industry standards.
  4. System Flexibility: Easily configurable into various system architectures to accommodate diverse operational needs and environments.
  5. Efficient Operation: Employs highly efficient SMPS power supplies with power factor correction (PFC), optimizing energy usage and reducing operational costs.
  6. Remote Control and Monitoring: Provides comprehensive remote control and monitoring facilities for efficient management and supervision of transmitter operation.
  7. User-Friendly Interface: Features an LCD display for convenient local monitoring, offering clear visibility of system parameters and status.

System Overview:

  • Drive Input: Fed to an internal 12-way splitter, supplying input drive to the PA modules.
  • Power Amplifier Modules (E2021): Each module utilizes dual-packaged MOSFETs mounted on substantial heatsink assemblies with efficient airflow. Internal control and self-protection mechanisms ensure safe operation.
  • Central Transmitter Controller/Monitor (E2023): Receives and displays internal parameters from individual power amplifier modules, facilitating centralized monitoring and control.
  • RF Output Combining: Outputs from the 12 power modules are combined via a highly efficient 12-way common rail Wilkinson combiner, ensuring optimal RF output.

Cooling Systems:

  • Features self-contained redundant cooling fans mounted on the rear of the transmitter, with optional ducting for customized cooling solutions.


  • Power Output: 3kW (adjustable to -6dB)
  • Operating Frequency: 87.5 to 108 MHz
  • RF Output Load Impedance: 50 ohms unbalanced
  • RF Output Connector: 7/8″ EIA
  • Maximum VSWR: Able to maintain full power at 1.5:1 before protection cuts in
  • Mains Power Supply: Single-phase 176-264V
  • RF Harmonic Output: Better than or equal to -79dBc
  • Power Factor: Typically 99%
  • Ambient Temperature Range: 0°C to +55°C at an altitude up to 3000M
  • Overall Efficiency: Typically 60%

This transmitter offers a robust solution for FM broadcasting, combining high performance, reliability, and ease of maintenance to meet the demands of professional broadcasting environments.