R V R Elettronica EDL600-FM FM Transmitters Broadcast Systems User Manual
- June 13, 2024
- R V R ELETTRONICA
Table of Contents
R V R Elettronica EDL600-FM FM Transmitters Broadcast Systems
Product Information
The EDL600-FM is a dummy load produced by RVR Elettronica SpA to be used with FM transmitters with a nominal power of up to 600 W. Dummy loads are primarily used as laboratory test devices and are often included in redundant (1+1 or N+1) transmission systems, where the output of the spare transmitter is connected to the dummy load for testing purposes.
The EDL600-FM is particularly suited for use in compact transmission systems due to its small form-factor. The quadratic construction enables easy installation.
Simply speaking, the EDL600-FM is a 50 ohm resistive load optimized to work in the audio FM band. The applied power is dissipated by four 50 ohm power resistors connected in a series/parallel configuration, which compensates for the parasitic capacitance of the resistors, resulting in a return loss better than 26 dB across the entire 87.5 – 108 MHz band. The resistors are fixed on a metal heatsink, and three fans generate the airflow to dissipate heat to the environment.
Product Usage Instructions
Power Connection
Always connect the power source (the transmitter) using the interlock connectors to avoid the possibility of excessive temperature rise that could damage the dummy load and even the transmitter itself.
External Description
The dummy load has the following external features:
- [1] Interlock connectors: BNC with inner normally grounded, floating in case of interlock
- [2] Input RF connector RF (N-type)
- [3] VDE plug for mains supply (220 AC)
- [4] Mains fuses for the fans (1A RAPID)
Make sure not to cover the airflow grid to ensure proper functioning of the device.
Power Derating
The power that the EDL600-FM can continuously dissipate depends on the temperature of the environment. It is essential to link the transmitter to the interlock connectors of the EDL600-FM to avoid the risk of damaging it.
Technical Specifications
No technical specifications were provided in the user manual.
Images
No images were provided in the user manual.
Introduction
The EDL600-FM is a dummy load produced by VR Elettronica SpA to be used with FM transmitter with nominal power up to 600 W. Dummy loads are mainly used as laboratory test devices and are often included in redundant (1+1 or N+1) transmission systems, in which the output of the spare transmitter is normally connected to the dummy load for test pourpouses. The EDL600-FM is particularily suited for the use in compact transmission systems, thanks to its small form-factor. The quadratic construction enables a simple installation.
Working Principle
- Simply speaking, the EDL600-FM is just a 50 § resistive load, optimized to work in the audio FM band.
- The applied power is dissipated by four 50 £ power resistors connected in a series parallel configuration (see the enclosed schematic), able to compensate the parasitic capacitance of the resistors, to obtain a return loss better than 26 dB on the whole 87.5 – 108 MHz band.
- The resistors are fixed on a metal heatsink, and three fans generate the air flow to let the heat pass to the environment.
- The fans are activated by a thermal bimetallic switch, that is normally opened and will close as soon as the heatsink’s temperature surpasses 55 °C.
- WARNING: Always connect the power source (the transmitter) using the interlock connectors, to avoid the possibility of an excessive temperature rise that could damage the dummy load and even the transmitter itself!
External Description
The following drawing shows the dummy load.
WARNING: don’t cover the airflow grid, to ensure proper functioning of
the device.
- Interlock connectors. BC with inner normally grounded, floating in case of interlock
- Input RF connector RF (N-type)
- VDE plug for mains supply (220 AC)
- Mains fuses for the fans (1A RAPID)
Power Derating
The power that the EDL600-FM can continuosly dissipate depends on the
temperature of the environment.
Since the dummy load can work at a temperature up to 90 °C before the
protection device is triggered, figure 2 gives the acceptable working area of
the device
WARNING: Please remember that it is essential to link the transmitter to
the interlock connectors of the EDL600-FM, to avoid the risk of damaging it.
Technical characteristics
- Frequency band: 87.5 – 108.0 MHz
- Nominal power at 40°C: 600 W
- Power derating at t > 40 °C: 12 W/°C
- Return loss: > 26 dB
- Power Supply: 230V ac + / – 10%
- Fuse: 2A
- Size: (LxH x D) 320 × 85 × 375 mm
- Weight: 12 kg
Images
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