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S79005 500w Transmitter/Amplifier

S79005The S79005 FM transmitter provides the same highly sought after modularity that Eddystone is renowned for in a more compact and cost effective package. The use of the E2021 300W hot-pluggable Power Amplifier modules means that removal of amplifiers can be carried out with minimal reduction in output power and it retains complete compatibility with its predecessor the S7600 series amplifiers.

  • Compact Amplifier and PSU Modules are replaceable On Air
  • Fully compliant with ETS 300 384 specification for FM transmitters
  • Easily configured into a wide range of system architectures
  • Uses highly efficient SMPSU power supplies with PF correction
  • Comprehensive remote control and monitoring facilities
  • LCD display ensures easy local monitoring


  • System Overview

    The drive input is fed to an internal 2 way splitter which provides the PA module input drive. Each E2021 Power amplifier uses dual packaged MOSFET’s mounted on a substantial heatsink assembly with minimum airflow over RF components. DC power is fed to the RF modules from the 1 or 2 (option) switched mode power supplies. Internal control and self protection in case of reverse power, excess current or over temperature is handled within each individual E2021 power amplifier module with all monitoring being microprocessor derived. Each module transmits its internal parameters to the central transmitter controller/monitor (E2023) and parameters are displayed on an easy to read backlit LCD screen. Outputs from the 2 Power modules are combined via a highly efficient 2 way common rail wilkinson combiner. The combined RF output is then fed to the output coupler and harmonic filter.


    Eddystone Broadcast low power transmitters have self contained redundant cooling fans mounted on the rear of the transmitter. This cooling system can be ducted if required and bespoke systems can be provided to meet special requirements.

  • Specifications

    Power Output
    500W (Adjustable to -6dB)
    Operating Frequency
    87.5 to 108 MHz
    RF Output Load Impedance
    50 ohm unbalanced
    RF Output Connector
    N Type Female
    Maximum VSWR
    Able to maintain full power at 1.5:1 before protection cuts in
    Mains Power Supply
    Single phase 85-265V
    RF Harmonic Output
    Better than or equal to -79dBc
    Ambient Temperature Range
    5 ° C to +55 ° C at an altitude up to 3000M
    Overall Efficiency
    Typically 60%


  • User Manual
    Block Diagram
    Spec Sheet


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