Rev. 004
ETL0W474G
Section C-
Section C-
Section C-
Section C-SYSTEM DESCRIPTION AND TECHNICAL
SYSTEM DESCRIPTION AND TECHNICAL
SYSTEM DESCRIPTION AND TECHNICAL
SYSTEM DESCRIPTION AND TECHNICAL
SPECIFICATIONS
SPECIFICATIONS
SPECIFICATIONS
SPECIFICATIONS
I -
I -
I -
I - INTRODUCTION
INTRODUCTION
INTRODUCTION
INTRODUCTION
•
The series ETL0W474G TV RF Amplifier provides linear, class “AB” amplification of RF TV signal in
the standard UHF bands IV & V (470 to 860 MHz).
•
ETL0W474G is designed to work both in DTV mode and ATV mode.
•
Rated RF output power is set to 750 W (rms) for DTV mode and 1800 W peak sync for ATV mode.
•
The use of high efficiency, high power gain LDMOS power transistors allows to obtain highly
efficient amplifier modules as ETL0W474G.
•
The ETL0W474G Amplifier is liquid-cooled. A cooling serpentine routed through the heat-sink
optimally cools the power transistors and the switching power supply unit greatly reducing the
temperature of active elements. This involves an efficiently use and a longer lifetime of the system.
•
An additional fan is included in the case of ETL0W474G to create an airflow within the case to
dissipate any residual heat.
•
ETL0W474G connection to the cooling system is made through quick couplers at the coolant inlet
and outlet.
II -
II -
II -
II - COMPOSITION OF RF AMPLIFIER SERIES ETL0W474G
COMPOSITION OF RF AMPLIFIER SERIES ETL0W474G
COMPOSITION OF RF AMPLIFIER SERIES ETL0W474G
COMPOSITION OF RF AMPLIFIER SERIES ETL0W474G
•
The series ETL0W474G TV R.F. Amplifier consists of one class “AB” driver stage, that feeds four
class “AB” final RF amplifiers combined. Other parts of this Amplifier are: four identical switching
power supply modules for final amplifiers, two identical switching power supply modules for driver
amplifier, a microprocessor controlled metering, alarm and protection module, a directional
coupler. All these parts are assembled into a standard 3 unit 19 inch rack chassis.
•
The four R.F. amplifier modules of the output stage are coupled together by means of three
suspended substrate hybrid couplers.
•
The R.F. amplifier modules and the switching power supply of the driver are mounted on a heat sink
in the upper part of the cabinet whereas the other switching power supplies are mounted at the
bottom of the cabinet.
•
The modules are:
PARTS SUPPLIED IN THE STANDARD CONFIGURATION
PARTS SUPPLIED IN THE STANDARD CONFIGURATION
PARTS SUPPLIED IN THE STANDARD CONFIGURATION
PARTS SUPPLIED IN THE STANDARD CONFIGURATION
QTY
QTY
QTY
QTY
MODEL
MODEL
MODEL
MODEL
Class “AB” UHF RF driver Amplifier module
1
MOE267
Class “AB” UHF RF final Amplifier module (4 final Amplifiers)
4
MOE272
Switch Mode Power Supply Unit for driver Amplifiers
2
MOE143-3
Switch Mode Power Supply Unit for final Amplifiers
4
MOE104
Metering, alarm and protection module
1
MOE183-7
Oct 2013
CMAN0W474G
Page 9
9
9
9
