TABLE OF CONTENTS

TABLE OF CONTENTS

1 GENERAL INFORMATION

3 CIRCUIT DESCRIPTION

1.1 SCOPE OF MANUAL . . . . . . . . . . . . . . . . . . . .1-1

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

LTR®, Low Tier, and Data Models . . . . . . . . . . 1-1

1.2 TRANSCEIVER DESCRIPTION . . . . . . . . . . .1-1

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Available Frequency Bands . . . . . . . . . . . . . . . . 1-1

Front and Remote Mounting . . . . . . . . . . . . . . . 1-2

NPSPAC Models (800 MHz Only) . . . . . . . . . . 1-2

Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Transceiver Alignment . . . . . . . . . . . . . . . . . . . . 1-2

1.3 PART NUMBER BREAKDOWN. . . . . . . . . . .1-2

1.4 TRANSCEIVER IDENTIFICATION . . . . . . . .1-3 1.5 ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . .1-3 1.6 PRODUCT WARRANTY . . . . . . . . . . . . . . . . .1-4

1.7 FACTORY CUSTOMER SERVICE . . . . . . . .1-4 1.8 FACTORY RETURNS . . . . . . . . . . . . . . . . . . .1-5

1.9 REPLACEMENT PARTS . . . . . . . . . . . . . . . . .1-5 1.10 INTERNET HOME PAGE. . . . . . . . . . . . . . . . .1-5

2 INSTALLATION

2.1 GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1

Scope of Instructions . . . . . . . . . . . . . . . . . . . . . 2-1

Performance Tests . . . . . . . . . . . . . . . . . . . . . . . 2-1

Transceiver Programming . . . . . . . . . . . . . . . . . 2-2

Required Power Source . . . . . . . . . . . . . . . . . . . 2-2

2.2 MOUNTING THE TRANSCEIVER . . . . . . . . .2-2

Selecting A Mounting Location . . . . . . . . . . . . . 2-2

Installation Components . . . . . . . . . . . . . . . . . . . 2-2

Attaching Mounting Bracket . . . . . . . . . . . . . . . 2-2

2.3 POWER CABLE INSTALLATION . . . . . . . . .2-3

2.4 ACCESSORY CABLE INSTALLATION . . . .2-4

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Accessory Pigtail Installation . . . . . . . . . . . . . . . 2-5

Connecting Ignition Sense Wire. . . . . . . . . . . . . 2-5

Connecting Horn Alert Wire . . . . . . . . . . . . . . . 2-6

Other Accessory Cable Outputs . . . . . . . . . . . . . 2-6

2.5REMOTE CONTROL UNIT INSTALLATION2-6

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6 Mounting Remote Control Unit . . . . . . . . . . . . . 2-6

2.6 USING AN EXTERNAL SPEAKER . . . . . . . .2-7

2.7 DATA CABLE INSTALLATION . . . . . . . . . . .2-7

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Data Cable Installation . . . . . . . . . . . . . . . . . . . . 2-8

2.8 KEY CAP KITS . . . . . . . . . . . . . . . . . . . . . . . . .2-8

Multi-Net and LTR-Net Models. . . . . . . . . . . . . 2-8

SMARTNET/SmartZone Models. . . . . . . . . . . . 2-9

3.1GENERAL TRANSCEIVER DESCRIPTION 3-1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Circuit Protection (Fuses) . . . . . . . . . . . . . . . . . . 3-1

Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Audio/Logic Board . . . . . . . . . . . . . . . . . . . . . . . 3-1

Receiver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

3.2POWER DISTRIBUTION AND SWITCHING 3-2

Power Switching Control . . . . . . . . . . . . . . . . . . 3-2 Supply Switching . . . . . . . . . . . . . . . . . . . . . . . . 3-2

3.3AUDIO/LOGIC BOARD DIGITAL CIRCUIT 3-4

Microcontroller (U101) . . . . . . . . . . . . . . . . . . . . 3-4

Memory and Latch Programming . . . . . . . . . . . . 3-6

3.4 RECEIVE AUDIO/DATA PROCESSING . . . 3-7

Amplifier (U301B) . . . . . . . . . . . . . . . . . . . . . . . 3-7

Receive Audio Processing. . . . . . . . . . . . . . . . . . 3-7

Receive Data Processing . . . . . . . . . . . . . . . . . . . 3-8

Squelch Circuit (U304A, U304B) . . . . . . . . . . . . 3-9

3.5TRANSMIT AUDIO/DATA PROCESSING . 3-9 Microphone Amplifier (U303B),

High-Pass Filter (U303C) . . . . . . . . . . . . . . .

. 3-9

Summing Amplifier (U303D), Pre-Emphasis/

 

Limiter (U303A) . . . . . . . . . . . . . . . . . . . . . .

3-10

Splatter Filter (U302B, U302C) . . . . . . . . . . . .

3-10

Transmit Data Circuit (U302D, U302A). . . . . .

3-10

3.6 DISPLAY BOARD . . . . . . . . . . . . . . . . . . . . .

3-10

3.7SYNTHESIZER CIRCUIT DESCRIPTION

(UHF MODELS) . . . . . . . . . . . . . . . . . . . . . . 3-11

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11

Voltage-Controlled Oscillator . . . . . . . . . . . . . . 3-11

Active Filter (Q800), Buffer Amplifier (Q801) 3-12

VCO and TCXO Modulation . . . . . . . . . . . . . . 3-14

Synthesizer Integrated Circuit (U804) . . . . . . . 3-14

Lock Detect . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15

Charge Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15

Shift Register (U800, U801) and Digital

Potentiometer (U802) Programming. . . . . . . 3-15

3.8RECEIVER CIRCUIT DESCRIPTION

(UHF MODELS) . . . . . . . . . . . . . . . . . . . . . . 3-16

Front End Filter . . . . . . . . . . . . . . . . . . . . . . . . . 3-16

RF Amplifier (Q201). . . . . . . . . . . . . . . . . . . . . 3-17

First Mixer (Q202), Injection Amplifier (Q204) 3-17

Second Mixer/Detector (U201) . . . . . . . . . . . . . 3-17

3.9TRANSMITTER CIRCUIT DESCRIPTION

(UHF MODELS) . . . . . . . . . . . . . . . . . . . . . . 3-19

First and Second Amplifiers . . . . . . . . . . . . . . . 3-19

Third Amp and Predriver . . . . . . . . . . . . . . . . . 3-19

Driver (Q600), Final (Q601) . . . . . . . . . . . . . . . 3-20

Antenna Switch . . . . . . . . . . . . . . . . . . . . . . . . . 3-20

Directional Coupler, Low-Pass Filter . . . . . . . . 3-21

Power Control (U500A/B, Q500-Q503) . . . . . .3-21

 

February 2001

ii

Part No. 001-9800-001