1
TABLE OF CONTENTS
SECTION
TOPIC PAGE
1.
DR-142 SPECIFICATIONS
2
SUB-D 15 PIN CONNECTOR
3
2.
INTRODUCTION
GENERAL
4
Model Identification
4
FCC ID
4
Unauthorized Modifications
4
MAINTENANCE INFORMATION
4
Surface Mount Repairs
4
Precautions for handling CMOS
4
Synthesizer shield
5
3.
DESCRIPTION OF INPUT/OUTPUT
6
4.
PROGRAMMING THE RADIO
7
PROGRAMMING THE RADIO USING A PC COMPUTER
7
Programmable Features
7
COMPUTER SOFTWARE COPYRIGHTS
7
5.
DR-142 THEORY OF OPERATION
INTRODUCTION
8
POWER SUPPLY AND VOLTAGE DISTRIBUTION
8
REFERENCE OSCILLATOR
8
SYNTHESIZER
8
RECEIVER
9
Receiver Front End
9
FM Receiver Subsystem
9
Voice and Tone Conditioning
9
MICROCONTROLLER
10
6.
DR-142 ALIGNMENT PROCEDURE
RECOMMENDED TEST EQUIPMENT
11
RADIO PREPARATION
11
REFERENCE FREQUENCY
11
RECEIVER FRONT END TUNNING
11
RECEIVER SQUELCH
12
