DAB Air Cooled Transmitters

Itelco proudly presents its line of advanced solid state DAB transmitters. The air cooled transmitters are available in output power classes from 1W to 1kW for operating in VHF Band III and from 0,5W to 1,2kW in L-band. Output power more than 2 kW are typical of the multiblock configuration. The system configuration ranges from single transmitters,  passive exciter standby with automatic changeover to N+1 systems relying on Itelco�s reputed system engineering capability, and Multi-Block systems. 

The state-of-the-art of these transmitters is guaranteed by Itelco�s vast experience in RF systems, know-how in implementation of sophisticated technologies, and expertise in digital signal processing, which ensures a competitive edge to our customers. Itelco offers a Multi-Block Transmitter Configuration which allows integrating up to 4 DAB Exciters in a single transmitter. This enables any Itelco DAB transmitter to broadcast up to 24 digital radio programs, in 4 channel with 1 transmitter. Consequently you need fewer transmitters and, since the signal combined is at IF level, only one RF combiner, thus minimizing filter losses. Moreover you can achieve significant space saving within the transmitter station, and you can reduce the number of necessary spare parts.Itelco�s solid state DAB transmitters generate a COFDM RF signal of highest quality due to superior COFDM modulation, digital precorrection and linear RF amplification. The development of both the digital processing and RF stages by Itelco guarantees an exemplary integration of digital and analog technologies not available from manufacturers who utilize outside vendors for major system components.
Itelco�s innovative digital precorrector ensures minimal adjacent channel emissions, optimal signal linearity of the transmitter RF output and maximized amplifier efficiency. The Automatic Gain Control circuits in the PAs and the Automatic Level Control circuit in the exciter guarantee output power stability. 

The transmitters employ an optimized internal air cooling system, designed for reliable operation up to 45 �C, which, at that temperature ensures a constant and equal cooling. The cooling system incorporates an ultra-reliable main redundant blower in passive reserve with automatic exchange every ten days, and additional blowers for each power amplifier. Maintenance is simplified due to the straightforward system control and the user-friendly modular design that enables easy and quick access to all serviceable components. A great amount of maintenance can be carried out without interrupting transmitter operation. Design considerations and low flow rate of the air cooling system decrease the accumulation of dust and dirt, thereby extending the maintenance interval. An electric raceway contains all cables that further simplifies the maintenance. Itelco�s design ensures multi-sourcing down to component level.

Key Features/Benefits

- Clear, modular design
- High-performance DAB Exciter with integrated COFDM Modulator
- Fully compliant with ETSI ETS 300 401 edition 2, supporting all operation modes
- DAB band III and L-band transmitter models
- Easy reprogrammable devices
- Effective self diagnostic capability (on-line and off-line)
- Digital precorrector minimizes adjacent channel emissions and provides optimal signal linearity
- Standard remote control and monitoring interface
- Exemplary integration of digital and analogue technologies
- Broadband RF power amplifier modules with Tetrafet for VHF band or with LDMOS devices in L-band.
- Input for external frequency synchronisation (GPS) or internal GPS receiver (plug-in option)
- Designed for straightforward operation and maintenance
- Multi-Block configuration for broadcasting of up to 24 digital radio programs on 4 channels   with 1 Tx
- N+1 reserve system optionally available
- Exciter in passive standby (optional)
- Compact dimensions
- Designed and manufactured under ISO 9001 certified Quality Management System