Combining the very latest technologies with ECRESO’s proven RF experience, our 300W FM Transmitter has been designed to offer an innovative and highly reliable solution for low power transmission.

Based on a 6th Generation MOSFET, the Ecreso FM 300W is highly robust and delivers efficiency of up to 70%. Top signal quality and performance are achieved thanks to the “FM Band Direct to Frequency” Digital Modulator. It also offers several innovative features such as dynamic RDS encoding and an FM Limiter.

Fully featured for local maintenance and configuration, the Ecreso FM 300W allows extensive remote control by Web server, SNMP, RS232 or GPIOs.


Audemat ScriptEasy Powerful Performance

  • Digital FM modulator "direct to channel"
  • Highest signal quality
  • Perfect audio fidelity
  • Compact transmitter, modular design
  • Protected against VSWR, temperature, over-voltage, short circuit, overload...
  • Switching power supplies with large voltage range
  • Active surge current limiting
  • Optional surge suppressor
  • MPX over AES compatibility


Audemat ScriptEasy Powerful Control

  • Advanced Measurement Interface (AMI)
  • Expert Maintenance Reporting (EMR)
  • Intuitive web interface
  • Full SNMP management
  • Email Notifications


Audemat ScriptEasy Powerful Savings

  • Up to 70% efficiency
  • 6th MOSFET generation (WorldCast Systems’ design)
  • Reduced consumption and operational costs
  • Reduced heat and cooling costs
  • Longer component life span
  • Reduced maintenance costs
  • Built-in functionality


Digital Exciter


  • Digital FM modulator "direct to channel"
  • Highest signal quality
  • Perfect audio fidelity
  • Several built-in broadcast tools
  • Control of all signal parameters
advanced control


  • Advanced Measurement Interface (AMI)
  • Expert Maintenance Reporting (EMR)
  • Intuitive Web Interface
  • Full SNMP Management
up to 70% efficiency


  • 6th MOSFET generation (WorldCast Systems design)
  • Reduced consumption and operational costs
  • Reduced heat and cooling costs
  • Longer component life span
  • Reduced maintenance costs
highly reliable


  • Compact transmitter, modular design
  • Protected against VSWR, temperature, over-voltage, short circuit, overload...
  • Switching power supplies with large voltage range
  • Active surge current limiting
  • Optional Surge Suppressor
  • Automatic program input switching and recovery (audio and MPX)
  • Audio Backup (from µSD card)
  • Internal RDS Backup


Advanced Communication Pack

Advanced Communication Pack

  • Intuitive and secured Web Interface (TCP/IP)
  • Advanced Measurement Interface
  • Full SNMP Management
  • Audio Backup on µSD card
Embedded FM Limiter

Embedded FM Limiter

  • Automatic Gain Control
  • FM Limiter
  • MPX power limiter (ITU 412)
  • FM Hard Clipper
Dynamic RDS Encoder

Dynamic RDS Encoder

  • Supports PI, PS, TP, TA, MS, PTY, PTYN, DI, CT, AF, RT
  • Dynamic PS Scrolling
  • Pure and stable signal thanks to Digital Modulator
  • Delivers Audemat’s expertise in RDS
Single Frequency Network

Single Frequency Network

  • 10 MHz input for RF carrier synchronization 
  • Adjustable program delay (on audio / MPX inputs)
GPIO Boards

GPIO Boards

  • Digital GPIO Board : main alarm monitoring and control (RF off/on, Standby, Presets...)
  • OR Analog GPIO Board : with analog output voltages (forward power, temperature...)
Digital Stereo Encoder

Digital Stereo Encoder

  • High speed DSP circuitry
  • Subcarrier perfect synchronization
  • Amazing signal quality
Internal Surge Protector

Internal Surge Protector

  • Powerful protection against lightning
  • Visible status LED
  • Easy to replace
Email notifications

Email Notifications

  • Alarm sending by SMTP
  • Easy configuration of each notification
  • Same notifications can be sent by SNMP
MPX over AES

MPX over AES

  • Improved MPX signal quality
  • No hardware change
  • Compatible with MPX over IP APT codecs


Available in Redundant 1+1 & N+1 Systems. Find Out More:  1+1   N+1

USER Interface

Advanced Measurement Interface

Advanced Measurement Interface (AMI) 

Monthly history logs

24h History Logs

Ecreso offers up to 10 years' WARRANTY

WorldCast Systems offers a standard warranty of 3 years on all our FM transmitters and up to TEN YEARS' Warranty on our range of compact FM transmitters and new ECRESO FM 5kW/10kW for a small additional charge.

No other FM Transmitter Manufacturer even comes close to that commitment or confidence! We can offer the 10 Year Warranty with confidence thanks to:

  • Our exceptional design quality
  • The outstanding efficiency of our transmitters
  • Advanced diagnostics capabilities
Ecreso up to 10 year warranty

Be Proactive with Expert Maintenance Reporting

EMR is a proactive service available on ECRESO FM Transmitters. It sends the user regular reports on the status of key parameters such as temperatures, currents and voltages, plus information on the performance and lifespan of components such as the fan and power supply of the transmitter.

With detailed logging and trend analysis, Expert Maintenance Reporting can identify slow-burning problems and issue warnings well in advance to allow for corrective action to be taken.  A map-based display of current statuses and detailed, user-friendly reports and graphs can be accessed around the clock in the EMR user page.

Learn more about

Advanced Communication Pack

Connect with WorldCast MANAGER

The WorldCast MANAGER Desktop simplifies the management of all SNMP-enabled devices in a network, providing real-time status and visualization of multiple devices from a single screen. The intuitive and simple-to-use interface shows all devices located at your site(s) displaying product information, alerting you to any alarms and providing one-click access to the unit’s web-based control interface.

Free to download, the WorldCast MANAGER Desktop is compatible with all WorldCast Systems’ equipment as well as SNMP devices from ANY manufacturer.

The WorldCast MANAGER Server adds recorded measurements, detailed logs, alarm management / notifications and more…

Learn more about
WorldCast MANAGER Server
  Learn more about
WorldCast MANAGER Desktop

user report

User report

«The compact design of the ECRESO is not only a neat solution, it also makes it really easy to conduct maintenance tasks with no nasty surprises! They have totally changed our way of operating – very much for the better!»
Sylvain Cavet, Technical Director, Broadcast-associés, France 

user report

User report

«We have a 10 year warranty on the Ecreso system, a sign of a manufacturer with confidence in their design and one of these things that helps me sleep a little easier.»
Mike Woodworth, Peak Broadcasting Company, Arizona, USA


Current version: 1.5

Frequency range87.5 to 108 MHz by 10 kHz steps
Frequency stability< 10-6 per year
HF output N Type,  50 Ω
Power rangeRange: 20-300 W, Setting: 0-350 W 
VSWR< 1.35, Optimal performance: < 1.1
Spurious and harmonic suppression> 75 dBc
Efficiencyup to 70% for the ECRESO FM 300W
Max consumption500 W 
Voltage100 VAC to 254 VAC, 47 Hz - 63 Hz
Power factor> 0.9
Fuses10 AT
Analog input (LINE1)2 XLR connectors, balanced, >10 kΩ (600 Ω jumpers selectable), software adjustable level (-18/+18 dBu range)
AES Input (LINE2) 1 XLR connector, balanced, >110 Ω, software adjustable level (-20 to 0dBFS range), AES 16,24,32 bits, up to 192 kHz
2 Multiplex (MPX/SCA) inputs BNC type, unbalanced, >5 kΩ, software adjustable level (-18/+18 dBu range)
Composite operation
Bandwidth> 40 Hz to 53 kHz @ 0.1 dB,  > 20 Hz to 60 kHz @ 0.2 dB,  > 60 kHz to 80 kHz @ 0.4 dB
Intermodulation distortion< 0.05%
FM S/N ratio> 80 dB RMS @ 75 kHz deviation
AM noise< 0.1% (50 dB) RMS (20-20 000 Hz)
Stereo operation
Bandwidth> 20 Hz to 15 kHz @ 0.1 dB 
38 kHz discontinuance> 50 dB
Stereophonic crosstalk> 50 dB
Mono operation
Bandwidth> 40 Hz to 15 kHz @ 0.1 dB
Out of band rejection> 40 dB @ 19 kHz
Preemphasis0 μs, 50 μs or 75 μs
Environmental / Physical specifications
Overall dimensionsOverall: 487.5 X 2U X 475 mm, Rack size: 437.7 X 82 X 443.8 mm (WxHxD) 
Enclosure depth required600 mm 
Mounting19’’enclosure, with 4 M6X12 screws
Weight~9 kg / ~9.5 kg
Operating temperatureNominal: 5°C to 45°C, Maximum: 0°C to 50°C
Storage temperature -20°C to +70°C 
Humidity5 - 95 % non-condensing relative humidity
AltitudeUp to 3900 m 
Cooling1 fan: between 10 l/s and 30 l/s depending on ambient temperature
MarkingCE, FCC, ICC
Standards1999/5/CE (R&TTE), ETS 302 018 (EMC), ETS 300 384 (Radio), NF EN 60215 (Safety)

Order information

TF00441ECRESO FM 300W 
Software Options
SP01319Communication Pack
CD00106Basic RDS
CD00110FM Limiter
Hardware Options
SP01319GPIO board
SP01615Analog GPIO board 
SP01322RF metering board 
ST01792SFN Option 
SP01260Internal surge protector 
10 Year Warranty
EMR410 Year Warranty (Up to 750W)
Expert Maintenance Reporting
EMR6Expert Maintenance Reporting
Redundancy solutions : 1+1, N+1
Dummy loads, adapters, cables
Cavity filters, combiners and antenna systems
Coverage Study
Turnkey solutions for broadcasting site



  • Ecreso, FM transmitter range - Up to 10 Year Warranty


  • Low Power FM Transmitters Webinar in association with Crown Broadcast



  • ECRESO FM Low power

    Published on Feb 15, 2017
  • Expert Maintenance Reporting

    Published on Jun 13, 2016
  • Ecreso FM N+1

    Published on Feb 15, 2017
  • Ecreso Antennas

    Published on Feb 15, 2017

Quick Start Guides

  • Ecreso 100W - 300W - Quick Start

    Published on Feb 16, 2017
  • Ecreso 100W - 300W 1+1 - Quick Start

    Published on Feb 16, 2017


  • Ecreso 100W - 300W - Manual

    Published on Feb 15, 2017


  • Corporate Catalog

    Published on May 3, 2016
  • WorldCast Systems Overview

    Published on Feb 15, 2017

Press Kit

  • WorldCast Systems Logo - Press Kit

    Published on Feb 16, 2017