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Manuals
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Motorola Manuals
Radio
LST-5A
Operation and maintenance manual
Motorola LST-5A Operation And Maintenance Manual
Lightweight satellite transceiver
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Table Of Contents
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
Introduction
General Information
Abbreviations and Glossary
Equipment Description
Features
System Components
Transceiver
Antenna
Battery Case
Cable Assembly
Optional Antennas
Minimum Equipment Requirement
Reference Data
Operation
Controls, Indicators and Connectors
Front Panel Controls, Indicators and Connectors
Display Modes
Frequency Select
Frequency/Presets
Operational Procedures
Equipment Set-Up
Turning on the Unit
Entering Preset Data
Storing Preset Frequencies
Selecting Operating Modes
Selecting Transmit and Receive Channels
Setting Selective Call Codes
Setting SELCAL Codes
Selecting Meter Display
Selecting Baud Rate and Turning Modem on
Adjusting Transmit Power
Operating Procedures
Siting
Encrypted LOS Operation
Satellite Operation
Encrypted LOS Operation - Block Diagram
Remote Control Operation
Retransmit Operation
PT or CT LOS Relay Operation
PT Retransmit Operation
CT Retransmit Operation
CT Satellite Relay Operation
Scan Operation
Selecting Scan Channel
Beacon Operation
SELCAL Operation
Cancellation of Presets
Front Panel Illumination
Installation
Assembly and Preparation for Use
Unpacking the Radio Set
Checking Unpacked Equipment
Attaching the Handset
Attaching the Antennas
Compatible Communications Security Devices
Remote Operation
RCU Control
Computer Control
X Mode Connector
Data Rates and Logic Levels
Data Exchange Protocol
Typical Data Transfer
Timing Restrictions
Commands
Modem Operation
Interface Characteristics
System Maintenance
Common Operator Errors
Manual System Test
Test Equipment Required
Receiver Tests
Alternate Test Equipment
FM CT Sensitivity and Distortion
AM PT Sensitivity and Distortion
AM CT Sensitivity and Distortion
CT Audio Response
Squelch Sensitivity
Scan Function
Signal Strength Meter
Transmitter Tests
Transmitter Tests Setup
Transmit Frequency
Output Power
PT Modulation
CT Modulation
Modulation Distortion
Modem Tests
Beacon
Test Procedure
Automatic System Test
Troubleshooting Chart
Transmit and Receive Troubleshooting Chart
Transmit Troubleshooting Chart
Receive Troubleshooting Chart
Alignment Procedure
Frequency Alignment
Transmit Power Output Alignment
PT Modulation Adjustment
CT Modulation Adjustment
Required Tools
List of Replaceable Assemblies
Individual Assemblies
Display Assembly
Processor Assembly
Audio Assembly
Receiver Assembly
Synthesizer Assembly
ALC RF Driver Assembly
Motherboard Assembly
Modem Assembly
Fuse Replacement
Memory Battery Replacement
Transceiver Functional Description
Physical Description
Simplified Block Diagram
Functional Block Diagram
Receiver Block Diagram
Receiver Input Signals
Receiver Input/Output Diagram
Receiver Output Signals
Transmitter - Functional Block Diagram
Chassis Assembly
Transceiver Assembly
Detailed Description
Serial Input LCD Driver
Microprocessor Input/Output Lines
Other Input Lines
Other Output Lines
Logic Functions
Audio Assembly Logic Functions
Power Supply - DC
Receiver RF Board
Receiver if Board
Receive Mode
Automatic Gain Control
Squelch and Signal-Strength Indication
Fm/Am and R/T Selection
Maintenance and Troubleshooting
Output Signals
Input Signals
Voltage-Controlled Oscillator
Frequency Synthesis Scheme
TCXO Frequency Reference
Phase-Locked Loop
Programmable Dividers
Programmable Loop Filter
Modem on Mode
Modem off Mode
DC Filter
Voltage Limiting Circuit
Voltage Controlled Oscillator
Loop Filter
FM/AM Select
Board Interconnections
ALC Audio L Assembly
Beacon Generator
AGC Circuit
Filter/Sensor
Analog to Digital Converter
Power Select Circuit
ALC VCA Assembly
Voltage Controlled Amplifier
R/T Enable
Power Level Control
ALC Loop
Power Reference Adjustment
FM/AM Modulation Circuits
Audio Modulation Circuits - Schematic Diagram
ALC Audio L Board
UHF RF-Amplifier Assembly
Stage 1
Temperature Compensation
Thermal Switch
Select Components
Modem Interface
Demodulator/Bit Sync - Receive Mode
Modem Interface Block Diagram
Modulator - Transmit Mode
Operational Options
Shaped BPSK Modulation
Modem Options - Switch Settings
Lithium Battery Pre Conditioning
Installing or Replacing the Battery
Index
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Table of Contents
Troubleshooting
Troubleshooting chart
86
Transmit and receive troubleshooting chart
87
Transmit troubleshooting chart
88
Receive troubleshooting chart
90
Squelch and Signal-strength indication
143
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