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Tait TB9100 Service Manual
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90
RF Circ
ui
try
TB9100 Reciter Service Manual
© Tait Electronics Limited Janu
ary 2006
Figur
e 6.2
Rec
iter Receive
r Synthes
izer Block
Diagram
/R
/N
12.8MHz
Reference
Oscillator
Receiver
VCO
Programmable
Reference Divider
Programmable
VCO Divider
Phase
Detector
Lock Detect
Output
Charge
Pump
f
ref
f
VCOfb
Software
Register
VCO F
eedback
Attenuator
Lock Detect
Circuitry
64/65
Prescaler
F
requency Synthesizer IC
Loop
Filter
VCO
LNA
Buffer
Harmonic
Filter
Fixed Slope
Attenuator
Final
Driver
+20dBm LO
Clock
Data
Chip Select/Latch Enable
Serial Bus
89
91
Table of Contents
Default Chapter
3
Table of Contents
3
Preface
5
Scope of Manual
5
Enquiries and Comments
5
Updates of Manual and Equipment
5
Copyright
5
Disclaimer
5
Terminology
6
Signal Naming Convention
6
Bus Numbering Convention
6
Associated Documentation
6
Publication Record
7
Glossary
7
1 Replacing the Network Board
13
Equipment Required
13
Troubleshooting
14
Before You Start
15
Removing the Faulty Board
16
Replacing the Board
16
Restoring the Configuration
18
2 Reciter Circuit Descriptions
19
3 Digital Circuitry
21
Digital if
21
Digital Signal Processor (DSP)
22
Reduced Instruction Set Computer (RISC)
25
40Mhz Digital Clock
27
4 Reference Switch
29
Synthesizer
29
Vcxo
29
Reference Switch
30
5 Network Circuitry
33
Top Level Block Diagram
33
Risc Processor
38
Memory
61
Dsp
65
I/O Buffers
71
Ethernet Interface
74
Audio and E&M Interface
77
Clock Oscillator
81
Power Supply
81
6 RF Circuitry
87
Receiver RF Circuitry - VHF Reciter
87
Receiver RF Circuitry - UHF Reciter
91
Exciter RF Circuitry
94
7 Power Supply
101
Rf Pcb
101
Digital PCB
101
8 Appendices
103
Appendix A - I2C Device Addresses
103
Appendix B - ASIF Connectors
104
Appendix C - Test Points
109
Appendix D - Processor Port Assignments
111
Appendix E - Component Locations
128
Tait Electronics Limited January
129
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Tait TB9100 Specifications
General
Brand
Tait
Model
TB9100
Category
Accessories
Language
English
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