Home >W682D Liquid Cooled
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 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 a dedicated high efficiency switchmode DC/DC converter. There are no dangerous high voltages (43 Volts are nominal) at the modules input. Modules require no tuning and are self-protected against VSWR, RF input overdrive, overcurrent, overtemperature, overvoltage and undervoltage. Modules are hot-pluggable thanks to the use of isolated combiners, allowing safe removal and insertion without interrupting transmitter operation. 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. RF power outputs of the various amplifier modules are combined by means of wideband combiners.

 

FUNCTIONAL BLOCK DIAGRAM

TECHNICAL CHARACTERISTICS

Electrical Features

 Frequency range            170 to 240MHz (Full Band)           
 Input/Output impedance  50 ohm 
 Nominal input power  20mW DVB
 32mW DTV
 75 mWps (Comb.)
 100 mWps (Sep.)
 Input Return loss   < -18 dB
 Operative gain setting 43dB ± 3dB
 Flatness ±2dB
 Nominal output power  400 Wrms DVB (Max 420W)
   650 Wrms DTV (Max 700W)
   1500 Wps Ps (Comb) (Max 1600W)
    2000 Wps Ps (Sep.) (Max 2200W)
 Woking class   AB
 Nominal Power Supply  40V
 Power consumption DVB mode  2300W max
 Power consumption DTV mode  3000W max
 Power consumption A+V comb  3500W max
 Power consumption V separat   4000W max

Mechanical Features

 Dimensions  420x800x74mm.

Environmental Features

Temperature range 0 ÷ 45°C
Altitude range   0÷ 3000 meters
Relative Humidity   0÷ 95% without condensation
 Dimensions  212x500x177mm.
  Copyright@2003 Itelco USA Inc -