User's Manual

- The Exciter subsystem converts a two-port base band data signal, sent over the SSI bus from
the Station Control subsystem, to an analog signal representation. The analog signal is then
modulated with a low power RF transmitter carrier that is generated by the Exciter subsystem.
The power modulated RF carrier is then amplified and delivered to the PA at an intermediate
level of approximately +36 dBm for further amplification. The Exciter subsystem and PA
constitute the transmitter of the SLR 5000 series repeater. Additionally, the Exciter subsystem
also provides its own metering and diagnostics via software, as well as a self-contained
calibration (no field tuning is needed for the Exciter subsystem).
- The heart of the Station Control subsystem is the Texas Instruments DM8148 Host/ DSP
processor. In general, the SCM controls the entire coordination of the repeater functions.
Specifically, the Station Control subsystem provides for the following functionalities:
+ Contains and runs the preloaded repeater software
+ Manages inbound and outbound RF and Audio traffic
+ Provides an on-board USB port for local configuring, alignment and diagnostics via the
following applications:
• Customer Programming Software (CPS)
• Tuner application
• Repeater Diagnostic and Control (RDAC) software
+ Provides an Ethernet port for IP site connectivity and remote RDAC
+ Provides GPIO connectivity for third party controller interfaces
+ Provides for analog repeater audio connectivity
+ Data and Control to the Receiver subsystem via the SPI and SSI respectively
+ Data and Control to the Exciter subsystem via the SPI and SSI respectively
+ Control of the PA’s set power via the SPI
+ Configuration and fault management of all subsystems including the PS and PA
+ Generates the internal station reference
+ Provides control of the front panel module’s indicator LEDs.
- The PA module amplifies the intermediate level modulated RF signal from the Modem. It then
delivers the amplified signal to the transmitter antenna port at a power level within the rated
power band of the repeater, for transmission to the subscriber radios. In addition to its primary
task of amplification, the PA provides the following hardware functions for the repeater.
+ Harmonic attenuation
+ Inter-modulation attenuation (IMA) suppression
+ VSWR detection
+ RF power control (primary means)
+ Meters for diagnostics
+ Power rollback for temperature, VSWR, and voltage
+ Self-Contained calibration (no field alignment is needed for PA)
- The Front Panel module provides LED indications for general assessment of the status and
operational condition of the repeater. Additionally, the front panel also provides a USB service
port for configuration and alignment of the repeater.
- The PS Module provides DC power to the Modem, PA and Front Panel. It can also be used to
provide auxiliary power (nominal 13.6 VDC) to a number of third party controllers. Additionally, it
can operate in three different input modes:
MN001436A01-AD
Chapter 1: SLR 5000 Series Repeater
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