4kW FM Transmitter S7604 Eddystone Broadcast
The S7604 FM 4kW Broadcast Transmitter is an evolution of the highly modular architecture for which
Eddystone Broadcast transmitters are known. The use of 300W hot-pluggable Power Amplifier modules means that removal of amplifiers can be carried out with minimal reduction in output power. The design also features highly efficient hot-pluggable switched mode power supplies which also provide ease of servicing.
Both PA and SMPSU modules are common to the entire 7600 range from 500W to 20kW,
resulting in greatly reduced spares holding costs for networks and groups.
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4kW FM Transmitter S7604 Eddystone Broadcast

Specifications 4kW FM Transmitter S7604 Eddystone Broadcast 
Power Output
4kW (Adjustable to -6dB)
Operating Frequency
87.5 to 108 MHz
RF Output Load Impedance
50 ohm unbalanced
RF Output Connector
7-16 (female) DIN (7/8" available on request)
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%
4kW FM Transmitter S7604 Eddystone Broadcast 
System Overview
The drive input is fed to an internal 16 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 8 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 16 Power modules are combined via a highly efficient 16 way common rail Wilkinson combiner. The
combined RF output is then fed to the output coupler and harmonic filter.
4kW FM Transmitter S7604 Eddystone Broadcast 
Features
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 SMPS power supplies with PF correction
Comprehensive remote control and monitoring facilities
LCD display ensures easy local monitoring
Cooling Systems
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.

The S7604 FM 4kW Broadcast Transmitter is an evolution of the highly modular architecture for which
Eddystone Broadcast transmitters are known. The use of 300W hot-pluggable Power Amplifier modules means that removal of amplifiers can be carried out with minimal reduction in output power. The design also features highly efficient hot-pluggable switched mode power supplies which also provide ease of servicing.
Both PA and SMPSU modules are common to the entire 7600 range from 500W to 20kW,
resulting in greatly reduced spares holding costs for networks and groups.

Inventory is subject to prior sale. Product design, specifications & construction are subject to change without notice. Pictures are for general representational purposes and may not represent actual product. Not Responsible for errors in print, verify all data with us or manufacturer. Terms & Conditions of sale apply, for a copy contact us. Products may be discontinued without notice. All Data is Subject to Change Without Notice.