User's Manual

Chapter
2
GTR 8000 Base Radio Theory of Operation
For an understanding of the GTR 8000 Base Radio components, review the modules that provide the base radio
functionality, the modules that provide RF distribution functionality (RFDS), and the backplane that connects to other
modules within the site.
This chapter explains how the GTR 8000 Base Radio works in the context of your system.
Functions of the GTR 8000 Base Radio Modules
The following lists GTR 8000 Base Radio modules:
• Transceiver (XCVR) module (with or without a transceiver option card)
• Power amplifier module
• Fan module
• Power supply module
Function of the Transceiver Module
The transceiver module provides the control, exciter, receiver, and optional transceiver option card for the base radio.
Figure 5: Transceiver Module (Front View)
The transceiver generates the station reference, which typically must be locked on to one of many possible external
sources. The external source can be either the site controller TDM clocks or the external reference operating at 5 MHz
or 10 MHz.
The transceiver SPI bus allows communication with its receiver and exciter circuitry, as well as the power supply
module and power amplifier module.
Two or three circuit boards in the transceiver are:
• Transceiver Control Board: Performs the control management, digital signal processing, and transmit and
receive data formatting for the base radio.
• Transceiver RF Board: Contains DC power conversion/regulation and performs receiver and exciter functions.
• Transceiver Option Card
: An optional board that attaches to the control board. Provides an internal 10 MHz
frequency reference. For conventional operation, it also provides the analog interfaces and WildCard I/Os. The
transceiver option card requires an internal frequency reference oscillator alignment at different intervals
6871024P71-A | November 2013 |
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Applicant: Motorola Solutions
Equipment Type: ABZ89FC5810B / 109AB-5810B
Exhibit D (Permissive Change)