User's Manual

APPLICANT: MOTOROLA EQUIPMENT TYPE: ABZ89FC5823
User / Operational Manual
Functional Description / Operation of Modules (Draft)
EXHIBIT D1-6
Transceiver Module Overview
The transceiver (XCVR) module provides receiver, exciter and base radio control functions.
Receiver Overview
The Receiver, which supports two-branch diversity, provides the receiver functions for the Base Radio. The
receiver is a part of the ‘transceiver’ RF board and consists of a front end low noise amplifier section, an on board
pre-selector section, an IF filter section, and a baseband converter section. The receiver Voltage Controlled
Oscillator (VCO) and frequency synthesis circuitry blocks are also part of the receiver section. A digital decoding
section for interface to the control section microprocessor also exists as part of the receiver module.
The receiver interconnects to the control module using an 84-pin flex cable connector. There are no user controls
or indicators on the receiver. For IV&D, only single branch is supported. The receiver also provides enhanced
diagnostic capabilities. This includes receiver sensitivity checking, using on board calibrated noise generator. The
receiver first local oscillator is high side injection.
Exciter Overview
The exciter, in conjunction with the Power Amplifier or PA, provides the transmitter functions for the Base Radio.
The exciter, which is a part of ‘transceiver’ RF board, consists of a baseband circuit block, a baseband modulator
circuit block, a pre-amplifier circuit block, and a final amplifier circuit block. The transmitter Voltage Controlled
Oscillator (VCO) and frequency synthesis circuitry blocks are also part of the exciter. Other functional blocks in the
exciter include the various DC voltage regulators which drive the different circuits, the digital decoding circuitry
block which interfaces the exciter circuits to the microprocessor in the control section, metering capability, and
exciter to receiver loopback capability for diagnostic purposes.
The exciter interconnects to the control module using an 84-pin flex cable connector. There are no user controls or
indicators on the exciter. The exciter uses a Cartesian feedback linearization scheme. The complete Cartesian
feedback loop includes exciter and PA. The exciter includes an internal loop back feature which is used to perform
exciter self diagnostic testing. The exciter also provides controlled output power level to power amplifier.
Control Overview
The Transceiver Control circuitry performs the control management, digital signal processing, and transmit and
receive data formatting for the base radio (BR). The Host Processor is a Freescale MPC8250 and the main DSP
is a Freescale MSC8101. A second DSP is a Texas Instrument device (TMS320VC5502) and is used for Block
Encoding/Decoding. It also provides the various external interfaces described below.