Bell RT-67/GRC Manuals

Manuals and User Guides for Bell RT-67/GRC. We have 1 Bell RT-67/GRC manual available for free PDF download: Technical Manual

Bell RT-67/GRC Technical Manual (234 pages)

Receiver-transmitters

Brand: Bell | Category: Transmitter | Size: 34 MB

Contents
3
General Principles
4
Back-Pressure Arm Lift Method
4
Compression Phase
4
Expansion Phase
4
Typical Receiver-Transmitter Over-All View
6
Introduction
7
General
7
Description and Data
7
Forms and Records
7
Frequency Spectrum Chart
8
System Application
9
Basic Arrangement
10
References
10
Technical Characteristics
11
Over-All Equipment
11
Description of Receiver-Transmitter
13
Controls, Instruments and Connectors
18
Additional Equipment Required
20
Spare Parts
20
Miscellaneous Accessory Equipment
20
Theory of Receiver-Transmitter
21
Transmitter Carrier Frequency and Receiver I-F Generation
21
Tuning Arrangement
24
Tuned Circuits
24
Mechanical Coupling and Gearing Arrangement
24
Continuously Variable Tuning
25
Number of Detent Settings
27
Preselection of Detented Channels
27
Antenna Trimming Mechanism
28
Transmitter Circuits, Block Diagram
28
Receiver-Transmitter Control Circuits
28
Automatic Frequency Control
29
Sidetone
29
Ringer Circuit
29
Receiver Circuits, Block Diagram
29
Test Circuit
30
Fixed Second I-F Amplifier and Limiter
30
Discriminator
30
Squelch Oscillator V-103
30
Stage Analysis
31
Microphone Input Circuit
31
Modulation
32
Crystal Oscillator
34
Harmonic Generator
34
Transmitter Mixer V-6
37
Transmitter R-F Ampplifier V-7 and V-8
38
Transmitter Drivers V-9 and V10
39
Transmitter Power Amplifier
41
Receiver R-F Amplifier V-1
44
Receiver First Mixer V-2
44
Variable I-F Amplifiers V-107 and V-108
45
Receiver Oscillator V101
47
Receiver Second Mixer
48
Fixed I-F Amplifier Limiter Circuit
49
Second Limiter Stage V-112
50
Limiting Action
50
Circuit Differences
51
Discriminator Circuit V-113 and V-114
52
Discriminator Function
52
Circuit Arrangement
52
Discriminator Theory, Vector Diagram
53
Discriminator Characteristics
54
Measuring Points
54
First Audio Amplifier V-115
55
Discriminator Output Circuits
55
Power Audio Amplifier V-116
57
Retransmit Audio Amplifier V-102
57
Squelch Circuit V-103
58
Control Circuits
60
Filament Circuits
63
Relay O-1
63
Plate Supply Circuits
64
Receiver Supply Circuits
64
Transmitter Supply Circuits
65
Measuring Circuit
66
System Wiring
68
R-F Chassis, Component Side
68
Field Maintenance
76
Troubleshooting
76
Short-Circuit Checks
76
Operational Checks
76
Test Equipment and Tools Required for Troubleshooting
77
Checking Key Circuits for Shorts
77
Voltage Measurements
77
Additional Checks
77
Antenna Load
78
Audio Devices
79
Power Supply
79
Purpose and Use of Operational Check Chart
82
Additional Trouble Secionalization Data
82
Circuit Sections for Operational Checks
82
Use of Operational Check Chart
82
Receiver-Transmitter Tracking Check Chart
98
Tracking Charts
98
Analysis of Measurement Data
98
Filament Circuit Trouble Localization Chart
99
Signal Substitution
99
Signal Tracing in Receiver
100
Stage Gain Chart
100
Resistance Measurements
102
D-C Voltage Measurements
111
Check of Interrupt Strapping Connections
111
Repairs
112
Replacement of Parts
112
Tagging Leads
112
Reassembling the Equipment
113
Removal of R-F Chassis
113
Sockets
115
Stand-Off Insulators
115
Panel Connectors
115
Replacement of Variable Capacitor C-17
117
Antenna Tuning Capacitor Assembly
117
Replacement of Components in Tuning Unit Cans
117
Crystal Switch Assembly
118
Meter
118
Dial-Drive Mechanism
118
Replacement of Dial Lamp
119
Terminal Boards, Component Location Diagrams
120
Lubrication and Weatherproofing
121
Rustproofing
121
Tropical Maintenance
121
Winter Maintenance
121
Alinement Procedures
122
Test Equipment Required for Alinement
122
Initial Procedures
122
Receiver Alinement
122
Adjustment of Tenth Mcs Dial Detent Screws
124
Variable I-F Amplifier
124
Transmitter Alinement
126
Transmitter Oscillator V-104A
126
Final Testing
130
Over All Receiver Sensitivity
130
Variable L-F Selectivity
131
Spurious Response
131
Calibration
132
Check of Bandwidth
132
Fixed I-F Amplifier
132
Over-All Receiver
133
Repacking for Shipment or Limited Storage
134
Demolition of Material to Prevent Enemy Use
134
Identification Table of Parts
137
Resistor Color Codes
181
Capacitor Color Codes
183
Index
184
1St Fixed if
187

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