IOT Technology
Cooling System

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Solid State Technology Power Amplifier Modules

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W352D is manufactured using high reliability, solid state components. The cooling system of the W352D module is a pin.fins cold plate which carries out the indirect thermic exchange between the electronic devices and a water-antifreeze agent mixture. This system is more efficient than the air cooled ones concerning with the dissipation of high thermic powers generated by several heat sources uniformly distributed. The gain and the phase of the module can be adjusted by simply removing the front panel, without need of module extraction. W352D amplifier final stages work in AB class to reach a good compromise between introduced distortion and dissipated power with low current consumption. The W352D module is selfprotected from overdrive of the RF input power, from incidental reflected power, from overvoltage of the amplifier power supply voltages and from driver and final stage abnormal absorption, thanks to the module control logic ass.y, which consists of a Master CPU and three Detector CPU. The Master CPU, in turn, transfers information to the equipment supervisory system control logic via RS485 and consequently the module status and functioning can be monitored on the control logic monitor. In addiction the same information is available on the RS232 port which is attainable by removing the front panel
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(Click to see FUNCTIONAL BLOCK DIAGRAM and TECHNICAL CHARACTERISTICS)

   
     

W682D
VHF Power Amplifier Module
(Liquid Cooled)

Itelco proudly presents its liquid cooled UHF full LD-MOS power amplifier module, used in Solid State Transmitters. The ruggedly designed power amplifier modules (PAs) are broadband, covering the entire 470-860 MHz UHF range. The PAs are equipped with RF devices suitable for broadcasting signal amplification both in analog (common and separate) and digital transmission (DVB and DTV). Itelco power amplifier modules achieve unsurpassed peakpower margins and efficiency due to the very advanced circuit design (e.g. no need for circulators), state-of-the-art solid state technology, and efficient liquid cooling. Temperature compensation and power gain of the modules are microprocessor controlled. Each module incorporates its dedicated high efficiency switchmode DC/DC converter. There are no dangerous high voltages (43 Volts are nominal) at the modules input. The modules require no tuning and are self-protected against VSWR, RF input overdrive, overcurrent, overtemperature, overvoltage and undervoltage. The modules are hot-pluggable thanks to the use of isolated combiners, allowing safe removal and insertion without interrupting transmitter operation. The incorporated quick connectors ensure engagement and disengagement from the liquid cooling circuit without loss of liquid coolant. A phase and amplitude regulation control is located at the input of each amplifier module to ensure maximum combining efficiency. The RF power outputs of the various amplifier modules are combined by means of wideband combiners....(Click here to see FUNCTIONAL BLOCK DIAGRAM and TECHNICAL CHARACTERISTICS)

 
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