Document Outline

• TABLE OF CONTENTS
• SECTION 1 GENERAL INFORMATION
  • 1.1 SCOPE OF MANUAL
    • 1.1.1 General
    • 1.1.2 LTR®, Low Tier, and Data Models
  • 1.2 TRANSCEIVER DESCRIPTION
    • 1.2.1 General
    • 1.2.2 Available Frequency Bands
    • 1.2.3 Front and Remote Mounting
    • 1.2.4 NPSPAC Models (800 MHz Only)
    • 1.2.5 Programming
    • 1.2.6 Transceiver Alignment
  • 1.3 PART NUMBER BREAKDOWN
  • 1.4 TRANSCEIVER IDENTIFICATION
  • 1.5 ACCESSORIES
  • 1.6 PRODUCT WARRANTY
  • 1.7 FACTORY CUSTOMER SERVICE
  • 1.8 FACTORY RETURNS
  • 1.9 REPLACEMENT PARTS
  • 1.10 INTERNET HOME PAGE
  • 800 MHz 988x SPECIFICATIONS
  • 900 MHz 989x SPECIFICATIONS
  • UHF 984x SPECIFICATIONS
• SECTION 2 INSTALLATION
  • 2.1 GENERAL
    • 2.1.1 Scope of Instructions
    • 2.1.2 Performance Tests
    • 2.1.3 Transceiver Programming
    • 2.1.4 Required Power Source
  • 2.2 MOUNTING THE TRANSCEIVER
    • 2.2.1 Selecting A Mounting Location
    • 2.2.2 Installation Components
    • 2.2.3 Attaching Mounting Bracket
  • 2.3 POWER CABLE INSTALLATION
  • 2.4 ACCESSORY CABLE INSTALLATION
    • 2.4.1 General
    • 2.4.2 Accessory Pigtail Installation
    • 2.4.3 Connecting Ignition Sense Wire
    • 2.4.4 Connecting Horn Alert Wire
    • 2.4.5 Other Accessory Cable Outputs
  • 2.5 REMOTE CONTROL UNIT INSTALLATION
    • 2.5.1 General
    • 2.5.2 Mounting Remote Control Unit
  • 2.6 USING AN EXTERNAL SPEAKER
  • 2.7 DATA CABLE INSTALLATION
    • 2.7.1 General
    • 2.7.2 Data Cable Installation
  • 2.8 KEY CAP KITS
    • 2.8.1 Multi-Net and LTR-Net Models
    • 2.8.2 SMARTNET/SmartZone Models
• SECTION 3 CIRCUIT DESCRIPTION
  • 3.1 GENERAL TRANSCEIVER DESCRIPTION
    • 3.1.1 Introduction
    • 3.1.2 Circuit Protection (Fuses)
    • 3.1.3 Synthesizer
    • 3.1.4 Audio/Logic Board
    • 3.1.5 Receiver
    • 3.1.6 Transmitter
  • 3.2 POWER DISTRIBUTION AND SWITCHING
    • 3.2.1 Power Switching Control
    • 3.2.2 Supply Switching
  • 3.3 AUDIO/LOGIC BOARD DIGITAL CIRCUIT
    • 3.3.1 Microcontroller (U101)
    • 3.3.2 Memory and Latch Programming
  • 3.4 RECEIVE AUDIO/DATA PROCESSING
    • 3.4.1 Amplifier (U301B)
    • 3.4.2 Receive Audio Processing
    • 3.4.3 Receive Data Processing
    • 3.4.4 Squelch Circuit (U304A, U304B)
  • 3.5 TRANSMIT AUDIO/DATA PROCESSING
    • 3.5.1 Microphone Amplifier (U303B), High-Pass Filter (U303C)
    • 3.5.2 Summing Amplifier (U303D), Pre- Emphasis/Limiter (U303A)
    • 3.5.3 Splatter Filter (U302B, U302C)
    • 3.5.4 Transmit Data Circuit (U302D, U302A)
  • 3.6 DISPLAY BOARD
  • 3.7 SYNTHESIZER CIRCUIT DESCRIPTION (UHF MODELS)
    • 3.7.1 Introduction
    • 3.7.2 Voltage-Controlled Oscillator
    • 3.7.3 Active Filter (Q800), Buffer Amplifier (Q801)
    • 3.7.4 VCO and TCXO Modulation
    • 3.7.5 Synthesizer Integrated Circuit (U804)
    • 3.7.6 Lock Detect
    • 3.7.7 Charge Pump
    • 3.7.8 Shift Register (U800, U801) and Digital Potentiometer (U802) Programming
  • 3.8 RECEIVER CIRCUIT DESCRIPTION (UHF MODELS)
    • 3.8.1 Front End Filter
    • 3.8.2 RF Amplifier (Q201)
    • 3.8.3 First Mixer (Q202), Injection Amplifier (Q204)
    • 3.8.4 Second Mixer/Detector (U201)
  • 3.9 TRANSMITTER CIRCUIT DESCRIPTION (UHF MODELS)
    • 3.9.1 First and Second Amplifiers
    • 3.9.2 Third Amp and Predriver
    • 3.9.3 Driver (Q600), Final (Q601)
    • 3.9.4 Antenna Switch
    • 3.9.5 Directional Coupler, Low-Pass Filter
    • 3.9.6 Power Control (U500A/B, Q500-Q503)
  • 3.10 SYNTHESIZER CIRCUIT DESCRIPTION (800/900 MHz MODELS)
    • 3.10.1 Introduction
    • 3.10.2 Voltage-Controlled Oscillator
    • 3.10.3 VCO and TCXO Modulation
    • 3.10.4 Active Filter (Q800)
    • 3.10.5 Buffer Amplifier (Q801), Tx/Tx Switch (CR801/CR802)
    • 3.10.6 Synthesizer Integrated Circuit (U804)
    • 3.10.7 Lock Detect
    • 3.10.8 Charge Pump
    • 3.10.9 Shift Register (U800, U801) and Digital Potentiometer (U802) Programming
  • 3.11 RECEIVER CIRCUIT DESCRIPTION (800/900 MHz MODELS)
    • 3.11.1 Front End Filter
    • 3.11.2 RF Amplifier (Q201)
    • 3.11.3 First Mixer (Q202), Crystal Filter (Z204)
    • 3.11.4 Second Mixer/Detector (U201)
  • 3.12 TRANSMITTER CIRCUIT DESCRIPTION (800/900 MHz MODELS)
    • 3.12.1 Predriver (Q506), Driver (Q507)
    • 3.12.2 Power Amplifier Module (U600), Final (Q651)
    • 3.12.3 Antenna Switch
    • 3.12.4 Directional Coupler, Low- Pass Filter
    • 3.12.5 Power Control (U500A/B, Q500- Q503)
• SECTION 4 SERVICING
  • 4.1 GENERAL
    • 4.1.1 Periodic Checks
    • 4.1.2 Schematic Diagrams and Component Layouts
    • 4.1.3 Replacement Parts
    • 4.1.4 Configuring Transceiver for Testing
  • 4.2 SURFACE MOUNTED DEVICES (SMDs)
    • 4.2.1 Servicing Techniques
    • 4.2.2 Identifying SMD Resistors
    • 4.2.3 SMD Capacitor Identification
    • 4.2.4 SMD Inductor Identification
    • 4.2.5 Transistor/Diode Identification
  • 4.3 SYNTHESIZER TROUBLESHOOTING
    • 4.3.1 Introduction
    • 4.3.2 Reference Oscillator (U806)
    • 4.3.3 VCO Module
    • 4.3.4 Synthesizer IC (U804)
    • 4.3.5 Determining Synthesizer Counter Divide Numbers
  • 4.4 RECEIVER SERVICING
  • 4.5 TRANSMITTER SERVICING
  • 4.6 AUDIO/LOGIC BOARD SERVICING
    • 4.6.1 Digital Circuits
    • 4.6.2 Analog Circuits
• SECTION 5 PARTS LIST
• SECTION 6 SCHEMATICS AND BOARD LAYOUTS