351804-1 Rev. 100
COM5000-8 TECHNICAL MANUAL
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CHAPTER 4
FUNCTIONAL DESCRIPTION
4.1
INTRODUCTION
This chapter starts with a functional description of the COM5000-8 power amplifier followed by a description
of the individual modules comprising it. These modules are:
1.25kW PA Module (4 each)
Combiner Module
System Controller Module
Power Supply Module
4.2
COM5000-8 SYSTEM
A block diagram of the COM5000-8 Amplifier System is shown in figure 4.2.
The RF output signal of the T-4180 is connected to the System Controller Module, where it is split into four
in-phase signals that each drives a PA module.
The outputs from the four PA modules are fed to a 4-Way, in-phase Combiner Module.
The Combiner output is routed to the antenna. Control and monitoring functions are provided by the System
Controller Module.
The COM5000-8 is powered by a 3-phase Power Supply Module rated at 15kW DC out (50V @ 300A).
4.3
1.25KW PA MODULE
A block diagram of the 1.25kW PA Module is shown below in figure 4.3.
The RF output signal from the System Controller module is applied to the RF INPUT of the PA module. The
signal is amplified in the Driver Amplifier and then split into four signals of approximately 10 watts each - two
@ 0 degrees and two @ 180 degrees relative phase. These signals are amplified in the 35
0W AMP’s.
The four 350W AMP outputs are combined in the 1.25 kW COMBINER and routed to the 8-band Harmonic
Filter Assembly.
A PA Controller provides control and monitoring functions as well as remote control from the System
Controller.
