Gtr 8000 Base Radio Theory Of Operation; Functions Of The Gtr 8000 Base Radio Modules; Function Of The Transceiver Module; Figure 2-1 Transceiver Module (Front View) - Motorola GTR 8000 Manual

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.

2.1 Functions of the GTR 8000 Base Radio Modules

The following lists GTR 8000 Base Radio modules:
• Transceiver (XCVR) module (with or without transceiver option card)
• Power amplifier module (not applicable in a GPW 8000 Receiver)
• Fan module
• Power supply module

2.1.1 Function of the Transceiver Module

The transceiver module provides the control, exciter, receiver, and optional transceiver option card for the base
radio/receiver.

Figure 2-1 Transceiver Module (Front View)

The transceiver generates the station reference, which typically needs to 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 or 10 MHz. An internal frequency reference operating at 10 MHz is available in an optional
transceiver option card.
The transceiver SPI bus allows communication with its receiver and exciter circuitry, as well as the power supply
and power amplifier modules.
There are two or three circuit boards in the transceiver:
• Transceiver Control Board: Performs the control management, digital signal processing, and transmit and
receive data formatting for the base radio.
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