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GM950E
Motorola GM950E User Manual
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216-246MHz Specific Information
6-i
Chapter 6
216-246MHz Specific Inf
or
mation
T
ab
le of Contents
T
able of Contents
Chapter
6.1
Model Chart and
T
echnical Specifications
6.2
Radio Tuning Procedure
6.3
Theory of Operation
6.4
PCB/Schematic Diagrams and Parts Lists
http://www.myradio168.net
148
150
Table of Contents
Chapter 2 Model Chart and Accessories
15
Safety Warnings
5
Chapter 1 Introduction
7
Introduction
7
Scope of Manual
11
Piece Parts
12
Transmitter
13
Table of Contents
15
Model Chart
17
Chapter 3 Maintenance
19
Overview
21
Speakers
22
Assemble Radio
23
Exploded View Diagrams and Parts
24
Cables
26
Test Equipment
27
Radio Tuning Procedure
28
PA Bias Voltage
29
Battery Threshold
30
Reference Oscillator
31
Rated Volume
32
Transmit Deviation Limit
33
Transmit Modulation Balance (Compensation)
34
Chapter 2
149
Model Chart
149
Table of Contents
151
Chapter 6 .1
153
Model Chart
153
Overview
153
General
154
Technical Specifications
154
Transmitter
154
Receiver
155
Table of Contents
157
General
159
Mhz Tuning Procedure
159
Battery Threshold
161
PA Bias Voltage
161
Reference Oscillator
162
Transmitter Power
162
Front-End Filter
163
Rated Volume
164
Squelch
164
Transmit Deviation Limit
165
Transmit Modulation Balance (Compensation)
165
Table of Contents
167
Paragraph Page
168
Overview
169
Controller
170
General
170
Voltage Regulators
170
Electronic On/Off
171
Ignition
171
Mechanical On/Off
171
Hook
172
Microprocessor Clock Synthesizer
172
Serial Peripheral Interface (SPI)
172
General Purpose Input/Output
173
Normal Microprocessor Operation
173
SBEP Serial Interface
173
Control Head Model A2 or A3
174
Audio Filter IC (AFIC)
175
Audio Ground
175
Controller Board Audio and Signalling Circuits
175
General
175
MIC Input Path
175
Transmit Audio Circuits
175
External MIC Path
176
PTT Sensing and TX Audio Processing
176
Sub-Audible Data (PL/DPL)
178
Transmit Signalling Circuits
178
High Speed Data and DTMF
179
Receive Audio Circuits
180
Squelch Detect
180
Audio Amplification Speaker (+) Speaker (-)
181
Audio Processing and Digital Volume Control
181
Discriminator Audio (Unfiltered)
182
Filtered Audio
182
Handset Audio
182
Option Board Audio
182
Accessories
182
High Speed Data Decoder
183
Receive Signalling Circuits
183
Sub-Audible Data Decoder (PL/DPL)
183
Alert Tone Circuits
184
216-246Mhz Specific Circuit Description
185
Mixer and Intermediate Frequency (IF) Section
185
Receiver Front-End
185
If IC (U5201)
186
Power Controlled Stage
186
Transmitter Power Amplifier (PA) 5-25W
186
Antenna Switch
187
Directional Coupler
187
PA Stages
187
Harmonic Filter
188
Power Control
188
Fractional-N Synthesizer (U3701)
190
Frequency Synthesis
190
Reference Oscillator
190
Voltage Controlled Oscillator (VCO)
190
Synthesizer Operation
191
Microphone Connector
223
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Motorola GM950E Specifications
General
Brand
Motorola
Model
GM950E
Category
Radio
Language
English
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