Harris Atlas DVL400, Техническое руководство

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2/25/03 888-2473-001 4-17
WARNING: Disconnect primary power prior to servicing.
Section 4 Theory of Operation
ATLAS Series™
4.4.3.3 Low Voltage Power Supply Distribution
The LVPS is distributed to all of the PA Modules and includes:
•
+7.5Vdc
•
+15Vdc
•
-15Vdc
For more information on the Low Voltage Power Supplies or LVPS, see "4.5.3 Low
Voltage Power Supplies (LVPS)" on page 4-32
4.4.4 PA Module
The Atlas Series™ PA Module is a wideband, high gain, liquid cooled RF
amplifier. Each PA module has a maximum RF output of 460W average power with
a liquid cooled heatsink. The number of PA modules is determined by the
transmitter power level or model and is given in Table 4-1. A fully populated
cabinet has 8 PA Modules. Each PA module has a smart controller which interfaces
via the CAN and parallel control bus to the transmitter Main Controller. Any faults
in the module will be reported to the Main Controller for diagnostics via the CAN
bus. A simplified block diagram of the PA module is shown in Figure 4-3.
Figure 4-3 PA Module Simplified Block Diagram
AB
PHASE
&
GAIN
CONTROL
BOARD
SS RELAY
AB
AB
AB
AB
AB
AB
A
FWD
TEMP
Pin
+32V
BIAS
RF IN
TO MAIN CONTROLLER
SWITCHED
+32V
ON/OFF
MODULE ENABLE/DISABLE
32V
MON
RF
OUT
AB
AB
AB
Auto Biasing
Pre-driver
Driver A
Driver B
8
CURRENT
SENSING
Pallets
Pallet Combiner
Splitter
Splitter
BIAS
BIAS
3
12
RFL
CAN Bus