4-14
888-2523-001
7/26/05
WARNING: Disconnect primary power prior to servicing.
Section 4 Theory of Operation
ATLAS Analogue
4.4
Transmitter RF System
4.4.1
TVS-D660 Exciter(s)
The Atlas transmitter comes standard with a single TVS-D660 exciter. A second
standby exciter is available as an option along with an exciter changeover switch in the
RF Unit (RFU). Operation and information about the TVS-D660 exciter is contained in
the instruction manuals shipped with the exciter. The output of the exciter(s) are
connected to the RFU.
4.4.2
RF Unit (RFU)
The RF Unit or RFU is a configurable unit which will have different components and
uses depending on the transmitter power level and the number of exciters. It is a 2 RU
device mounted in the front of the transmitter just above the exciters. Its basic function
is to house the exciter changeover switch when required and for exciter power metering.
The following examples cover the different configurations which are shown on the RFU
Wiring Diagram, 843-5575-100:
Configuration 1: With Single Exciter
•
For this configuration the RFU consists of the Down Converter and RFU
Controller for monitoring of the drive and power outputs.
Configuration 2: With Dual Exciters
•
For this configuration the RFU will include the Down Converter, RFU
controller, and an RF drive switch with a dummy load for the off-air exciter.
This allows for RF monitoring of the output power, and of both exciters and
automatic (or manual) changeover in case the output of the on-air exciter
fails.
The RF outputs of the RFU connect to the Backplane Interface Boards for distribution
to the PA Modules in each cabinet.
4.4.3
RF Controller Board
The RF Controller board is located just above the PA Modules in the rear of the
transmitter. The RF Controller is responsible for the following:
Summary of Contents for ATLAS ANALOGUE
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