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17-2
GSM Theory
Introduction
Introduction
The HP/Agilent 8922 product family is designed to measure and generate signals for the
GSM digital cellular telephone system. The HP/Agilent 8922 is both a signal generator
and a measuring receiver.
This chapter describes GSM system signals that are generated and received by the HP/
Agilent 8922. The GSM system is not described in detail due to complexity. This chapter
is intended only to describe the system as it relates to servicing the HP/Agilent 8922,
meaning the need to know the character of the signals generated and received.
- Assembly Level Repair 1
- HP/Agilent Technologies 1
- 8922 Series GSM Test Set 1
- Contents 10
- Localizing the Problem 11
- Introduction 12
- Power-Up Checks 14
- If Power-Up Checks FAILED 15
- Where to Go Next 21
- Running Diagnostics 27
- Loading the RAM Test 33
- Verifying Performance 35
- HP/Agilent 8922F/H or M/S 37
- To Run the Program 38
- Notes on Running the Program 38
- Configuring the RF Extender 41
- Configuring the RF Extender 42
- Extending Modules 43
- Making Measurements 44
- Parallel Bus 49
- Serial Bus 50
- Keyboard 52
- Power Cord Verification 57
- Power Cord Verification 58
- Transformer / Power Switch 60
- Where To Go Next 62
- Adjustments and Calibration 63
- Timebase Adjustments 65
- Periodic Calibrations 67
- Sum Loop Adjustment Procedure 68
- Second Adjustment 69
- Final Adjustment 69
- Final Check 69
- Top and Bottom Cover Removal 73
- Inside Protective Covers 74
- A1 Front Panel Removal 77
- Tools Required 79
- A11 Receiver Mixer Removal 80
- A12 Pulse Attenuator Removal 82
- A21 GPIB Interface Removal 84
- A22 Display Removal 86
- A23 Input Section Removal 88
- A24 Attenuator Removal 89
- A28 Power Supply Removal 90
- Fan Removal 92
- Transformer Removal 94
- Replacing a Part 100
- Replaceable Parts 100
- Firmware Upgrades 123
- Service Screen 125
- Self-Test Error Messages 129
- Module I/O Specifications 131
- A2 Audio Analyzer 2 133
- Module I/O Specifications 134
- A3 Audio Analyzer 1 135
- A4 Modulation Distribution 138
- Power Supplies 140
- Serial I/O 142
- A6 Signaling Source/Analyzer 143
- A9 Global Test and Demod 145
- A11 Receiver Mixer 149
- A13 Output 152
- A14 Pulse Driver 154
- A15 Reference 156
- Hop Control 157
- A16 Receiver 162
- A18 Spectrum Analyzer 166
- A19 Measurement 168
- A25 Sum Loop 180
- A17, A26 Step Loop 183
- A27 DAC/Upconverter 186
- A28 Power Supply 188
- A33 Hop Controller 189
- Instrument Block Diagrams 193
- Block Diagram 3 195
- Block Diagram 4 195
- Block Diagram 5 195
- Technical Discussion 199
- Block Diagram 1 200
- A17 StepLoop B 201
- A18 Spectrum Aanalyzer 203
- Block Diagram 2 205
- A26 Step Loop A 207
- A12 Pulse Attenuator 209
- A23 Input 209
- A24 High Power Attenutor 209
- HP/Agilent 8922B Only 211
- A37 Sequence Controller 212
- Diagnostics Theory 215
- AF_DIAGS 217
- Audio Analyzer 2 218
- RF_DIAGS 219
- RF Generator Step Loop 220
- Sum Loop 220
- Output Section 220
- Pulse Attenuator and Drive 221
- Input Section 221
- RF Analyzer Step Loop 222
- Spectrum Analyzer 223
- Receiver 223
- MS_DIAGS 225
- GSM and DCS Diagnostic Tests 226
- Interpreting Results 227
- Measurement Theory 229
- GSM Theory 235
- The GSM System 237
- Numerics 239
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