GE MASTR II User Manual

LBI-4732
TABLE OF CONTENTS
SPECIFICATIONS ................................................................... .
DESCRIPTION
...................................................................... .
CIRCUIT ANALYSIS ................................................................. .
Exciter ..................................................................... .
ICOMs .................................................................. .
Audio Preamplifier ..................................................... .
Audio IC ............................................................... .
Frequency Divider IC ................................................... .
Phase Modulators, Amplifiers & Multipliers ............................. .
Power Amplifier ............................................................. .
RF Amplifiers .......................................................... .
Power Control Circuit .................................................. .
MAINTENANCE ...................................................................... .
Disassembly ................................................................. .
PA Transistor Replacement ................................................... .
Alignment Procedure ......................................................... .
Test Procedures ............................................................. .
Power Output ........................................................... .
Tone Deviation ......................................................... .
Voice Deviation ........................................................ .
Troubleshooting
OUTLINE DIAGRAMS
Intermittent and Continuous Duty Exciter & PA Boards; Intermittent
Duty PA Assembly ............................................................ .
Continuous Duty PA Assembly ................................................. .
Frame Assembly .............................................................. .
SCHEMATIC
DIAGRAMS (with voltage readings)
Exciter ..................................................................... .
Power Amplifier (Intermittent Duty) ......................................... .
Power Amplifier (Continuous Duty) ........................................... .
PARTS
LIST AND PRODUCTION CHANGES
Exciter ..................................................................... .
Power Amplifier (Intermittent Duty) ......................................... .
Power Amplifier (Continuous Duty) ........................................... .
Figure
Figure
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Figure
Figure
Figure
Figure
Figure
Figure
Figure
ILLUSTRATIONS
l - Block Diagram ........................................................ .
2- Typical Crystal Characteristics ...................................... .
3 -
Equivalent !COM Circuit .............................................. .
4 -
Simplified Audio IC .................................................. .
5 -
Access to Exciter (Front View) ....................................... .
6- Access to Power Amplifier (Rear View) ................................ .
7 -
PA Board Removal ..................................................... .
8 - PA Transistor Lead Identification ................................... ..
9 - PA Transistor Lead Forming ........................................... .
10- Frequency Characteristics Vs. Temperature ............................ .
WARNING
Although the highest DC voltage in the MASTR II station transmitter is the 12 VDC
supply voltage, high currents may be drawn under short circuit conditions. These
currents can possibly heat metal objects such as tools, rings, watchbands, etc.,
enough to cause burns. Be careful when working near energized circuits! High-
level RF energy in the transmitter Power Amplifier assembly can cause RF burns
upon contact. KEEP AWAY FROM THESE CIRCUITS WHEN THE TRANSMITTER IS ENERGIZED!
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GE MASTR II Specifications

General

Brand	GE
Model	MASTR II
Category	Two-Way Radio
Language	English