Elettronika AUTV/3500LD, User Manual

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INTRODUCTION
The AUTV/3500LD belongs to the High Power UHF products family of Television Transmitters fully in solid
state technology.
The AUTV/3500LD series represents the 3,5kW TV Transmitters operating in the IV/V Band for Common
amplification process (separate amplification available) of the Vision and Sound carriers. This Transmitters
family has been designed to offer to the customer high performances, high reliability and greater simplicity in
their operation and maintenance procedures.
The Vision and Sound signal processing is provided for all TV Standards and all types of Audio applications
(Mono & Dual sound - NICAM) together with colour systems such as PAL - NTSC - SECAM. Thanks to
the amplitude and phase pre-correction circuit, it is possible to cancel the distortions in the output stage, thus
cutting down the operating costs. The RF transposition in the driver is carried out by a synthesizer with various
possibilities of accuracy and stability as well as precision offset locked by internal or external frequency
reference.
The RF amplifier is made up by three RF modules installed in a power rack, the modules are dedicated for the
Vision and Sound carriers common amplification. The amplifiers employ solid state LDMOS technology in
order to obtain wide band, reliability, and high efficiency. Each RF module has a built-in switching-mode
power supply unit, self-protected against overcurrents and overvoltages, as well as overtemperature and
VSWR for RF parameters. The cooling system is fully contained into the transmitter. The control unit provides
full management of the transmitter without the presence of the operator, the system includes a central controller
and several peripheral units installed in each RF module and rack. The control device includes a fault finding
system to detect equipment malfunctions and locate the faulty subassembly which needs to be replaced. The
interlock circuit is independent on the software and remains always operational whether computer control is
present or not. The operator interface is made by a high resolution LCD graphic display and a simple keyboard,
the menu is very friendly and easy to use.
The Control Unit can be fully controlled in REMOTE mode via link or via modem in RS232 or other interface.
The equipment design allows the soft degradation (RF power loss) for several transistors faults.
AUTV/3500LD
LDMOS - UHF TV SOLID STATE AMPLIFIER