7/26/05
888-2523-001
4-19
WARNING: Disconnect primary power prior to servicing.
Section 4 Theory of Operation
ATLAS Analogue
4.4.4
Backplane Interface Board
The Backplane Interface Board is accessed from the rear of the transmitter and is
located just above the PA Module compartment. Its function is to distribute RF, low
voltage and control signals to the PA modules.
4.4.4.1
RF Splitter
The output of the RFU drives the 8-way hybrid splitter on the Backplane Interface
Board. This type of splitter is broadband, covering the entire UHF range.
4.4.4.2
Control Distribution
The System Control Bus is also distributed to all of the PA Modules from here. The
control bus includes both dedicated parallel control lines and the CAN (Controller Area
Network) bus.
4.4.4.3
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 "4.5.5 Low
Voltage Power Supplies (LVPS)" on page 4-35
4.4.4.4
Backporch TV Sync
The Backporch TV Sync signal is generated by the TVS-D660 Exciter and routed to all
PA modules via the Backplane Interface board for AGC purposes.
Summary of Contents for ATLAS ANALOGUE
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