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SDM-650B Satellite Modem Maintenance
Rev. 6 6–9
6.1.3.2 Demodulator
Refer to Figure 6-8.
TP10 VCXO Control Voltage.
Approximately 0 to +2.5V sweep range.
TP23 Discriminator Voltage.
Nominally +2.5V with 6 dB noise at 128 kbit/s.
TPG1 Ground.
TP1 Q EYE Pattern.
Level is 1 Vp-p at the center of the eye crossing. The DC offset is about +2.4V.
TP2 Q THRS — Q channel threshold voltage, +2.9 VDC.
TP3 I THRS — I channel threshold voltage, +2.9 VDC.
TP4 I EYE Pattern.
Level is 1 Vp-p at the center of the eye crossing. The DC offset is about +2.4V.
TP5 Q CLK THRS +.
Q channel + clock threshold, +2 to +3 VDC.
TP6 Q CLK THRS -.
Q channel - clock threshold, +2 to +3 VDC.
TP7 I CLK THRS -.
I channel + clock threshold, +2 to +3 VDC.
TP8 I CLK THRS +.
I channel — clock threshold. +2 to +3 VDC.
Figure 6-8. Demodulator Test Points
- SDM-650B 1
- Preface 5
- Cautions and Warnings 6
- Military Standards 7
- Trademarks 7
- Related Documents 7
- European EMC Directive 8
- Customer Support 9
- Table of Contents 11
- Rev. 5 ix 13
- Rev. 5 xi 15
- Rev. 5 xiii 17
- Rev. 5 xv 19
- Rev. 5 xvii 21
- Figures 22
- Rev. 5 xix 23
- Chapter 1 25
- INTRODUCTION 25
- 1.1 Purpose and Function 26
- 1.2 Description 27
- 1.3 System Specification 29
- 1–8 Rev. 5 32
- Rev. 5 1–9 33
- 1–10 Rev. 5 34
- Rev. 5 1–11 35
- 1–12 Rev. 5 36
- Chapter 2 37
- INSTALLATION 37
- 2.2 External Connections 38
- 2.2.1 DATA I/O 39
- 2.2.2 Remote (J6) 39
- 2.2.3 Fault (J7) 39
- 2.2.4 IF Output (CP1) 40
- 2.2.5 IF Input (CP2) 40
- 2.2.6 AC Power 40
- 2.2.7 GROUND 41
- 2.3 System Requirements 41
- 2.4 System Installation 42
- Chapter 3 43
- CONFIGURATION 43
- 3.1.1.1 Remote Interface 44
- 3.1.1.2 Remote Baud Rate 45
- 3.1.1.3 Remote Address 46
- 3.1.1.4 Battery 46
- 3.1.1.7 Utility Defaults 47
- 3–6 Rev. 5 48
- 3.2 Digital Interfaces 49
- 3–8 Rev. 5 50
- Rev. 5 3–9 51
- 3–10 Rev. 5 52
- 3.2.1.2 Connector Pinouts 54
- 3.2.1.3 Specification 55
- 3.2.2 V.35 Interface 56
- Rev. 5 3–15 57
- 3–16 Rev. 5 58
- 3.2.2.2 Connector Pinouts 60
- 3.2.2.3 Specification 61
- SWITCH 1 62
- Rev. 5 3–21 63
- (See Note 1) 64
- (See Note 2) 64
- 3.2.3.2 Connector Pinouts 65
- 3.2.3.3 Specification 65
- Rev. 5 3–25 67
- 3.2.4.2 Optional EXT CLK 68
- 3.2.4.4 Connector Pinouts 69
- 3–28 Rev. 5 70
- 3.2.4.7 Send Data (J4) 72
- 3.2.4.8 Receive Data (J5) 72
- 3.2.4.9 Specification 73
- Rev. 5 3–33 75
- 3.2.5.3 Multiplexer 77
- 3.2.5.4 Demultiplexer 77
- 3–36 Rev. 5 78
- Rev. 5 3–39 81
- 3.3 Doppler Buffer 82
- 3–42 Rev. 5 84
- Rev. 5 3–43 85
- 3.3.1 Buffer Setup 86
- Rev. 5 3–45 87
- 3.3.1.1 Buffer Size 88
- 3.3.1.2 Doppler 88
- 3.3.1.3 Plesiochronous 89
- 3.3.1.5 Total Buffer Length 90
- 3.3.1.6 Converting 90
- 3.5 I/O Connectors 91
- 3.6.1 Master/Slave 92
- 3–52 Rev. 5 94
- 3.6.1.2 Master/Slave G.703 95
- 3.6.1.3 Master/Slave X.21 96
- Rev. 5 3–55 97
- 3.6.2 Master/Master 98
- • TX-CLOCK: EXT 99
- 3–58 Rev. 5 100
- Rev. 5 3–59 101
- 3–60 Rev. 5 102
- Chapter 4 103
- OPERATION 103
- 4.1 Front Panel 104
- 4.1.1 LED Indicators 105
- 4.1.2 Controls 105
- 4–4 Rev. 5 106
- [←] and [→] 106
- Rev. 5 4–5 107
- 4.1.4 Menu Explanations 111
- (Test Mode Configuration 112
- Option) 112
- ↑] and [↓] to select 116
- 4.1.4.2 Select Monitor 117
- 4.1.4.3 Select Faults 118
- 4–18 Rev. 5 120
- 4.1.4.5 Select Utility 121
- ↑] and [↓] to change that 123
- ←] and [→] to see the 124
- Chapter 5 125
- THEORY OF OPERATION 125
- 5–2 Rev. 6 126
- 5.1.1 Specifications 127
- 5–4 Rev. 6 128
- 5.1.2 Theory of Operation 129
- 5–6 Rev. 6 130
- Rev. 6 5–7 131
- 5.2.1 Specification 132
- 5.2.2 Theory of Operation 133
- 5.2.2.2 Sequential Decoder 134
- Rev. 6 5–11 135
- 5–12 Rev. 6 136
- Rev. 6 5–13 137
- 5–14 Rev. 6 138
- Rev. 6 5–15 139
- 5.3 Demodulator 140
- 5.3.1 Specifications 141
- 5.3.2 Theory of Operation 141
- 5.4.1 Reacquisition 142
- 5.4.2 Fast Acquisition 143
- 5.4.3 Directed Sweep 144
- Chapter 6 145
- MAINTENANCE 145
- 6.1.2 Demodulator 146
- Rev. 6 6–3 147
- 6–4 Rev. 6 148
- Various Code Rates 149
- 6–6 Rev. 6 150
- Rev. 6 6–7 151
- 6.1.3 Test Points 152
- 6.1.3.1 Modulator 152
- 6.1.3.2 Demodulator 153
- 6.2 Fault Isolation 155
- Rev. 6 6–17 161
- 6–18 Rev. 6 162
- Rev. 6 6–19 163
- 6–20 Rev. 6 164
- 6.4 Module Replacement 165
- 6.5 Module Identification 165
- Appendix A 167
- DATA RATES AND FILTERS 167
- A–2 Rev. 6 168
- Rev. 6 A–3 169
- A–4 Rev. 6 170
- A.2 Variable Rate Filters 172
- ←] and [→] to move 174
- A.2.3 Utility 175
- ←] and [→] 176
- Appendix B 177
- REMOTE CONTROL OPERATION 177
- B.1.1 General 178
- B.1.2 Message Structure 178
- B.1.2.1 Start Character 178
- B.1.2.2 Device Address 179
- B.1.2.3 Command/Response 180
- B.1.2.4 End Character 180
- B.1.3.1 Remote 181
- B.1.3.3 Set RF Output 181
- B.1.3.7 Modulator Rate 183
- B.1.3.8 Demodulator Rate 185
- B.1.3.9 Scrambler Enable 186
- B.1.3.10 Descrambler Enable 186
- B.1.3.12 Transmit Clock 187
- B.1.3.13 Receive Clock 187
- B.1.3.14 Baseband Loopback 187
- B.1.3.15 RF Loopback 188
- B.1.3.16 IF Loopback 188
- B.1.3.17 Time of Day 188
- B.1.3.18 Date 189
- B.1.3.20 BER Threshold 189
- B.1.3.22.3 Sweep Direction 192
- B.1.3.24.1 Buffer Clock 193
- B.1.4.1 Configuration 194
- B.1.4.3 Modulator Status 197
- B.1.4.4 Demodulator Status 197
- B.1.4.7 BER Status 199
- B.1.4.7.1 Raw BER 199
- B.1.4.7.2 Corrected BER 199
- B.1.4.8 E 200
- Status 200
- B.1.4.13 Stored Faults 202
- B.1.4.17 Change Status 207
- B.1.4.18 Equipment Type 208
- B.2.1 General 209
- B.2.2 Message Structure 209
- B.2.2.1 Start Character 210
- B.2.2.2 Device Address 210
- B.2.2.3 Command/Response 211
- B.2.2.4 End Character 211
- B.2.3.2 Set RF Output 212
- B.2.3.5 Modulator Rate 214
- B.2.3.6 Scrambler Enable 215
- B.2.4.2 Demodulator Rate 216
- B.2.4.3 Descramble Enable 218
- B.2.4.4 RF Loopback 218
- B.2.4.5 IF Loopback 218
- B.2.4.6 BER Threshold 218
- B.2.4.7 Sweep Reacquisition 219
- B.2.4.8.2 Sweep Width Range 220
- B.2.4.8.3 Sweep Direction 221
- B.2.5.1 Transmit Clock 221
- B.2.5.2 Buffer Clock 221
- B.2.5.3 Receive Clock 222
- B.2.5.5 Interface Loopback 222
- B.2.5.6 Baseband Loopback 222
- B.2.6.1 Time of Day 225
- B.2.6.2 Date 226
- B.2.6.3 Remote 226
- B.2.6.4 Clear Stored Faults 226
- B.2.7.1.1 Local AUPC Enable 227
- Pattern) 230
- Modulator/Coder 231
- B.2.8.3 Modulator Status 236
- B.2.8.4 Demodulator Status 236
- B.2.8.8.1 Raw BER 238
- B.2.8.8.2 Corrected BER 238
- B.2.8.9 E 239
- B.2.8.10 Modulator Rate 239
- B.2.8.11 Demodulator Rate 239
- B.2.8.16 Stored Faults 241
- B.2.8.20 Change Status 248
- B.2.8.21 Equipment Type 248
- Appendix C 249
- FIELD COMPATIBILITY 249
- Appendix D 251
- SOFTWARE CHANGE 251
- INSTRUCTIONS 251
- Appendix E 253
- AGC INTERFACE 253
- E.1 Connector Pinouts 254
- E.2.1 Parts Required 254
- Ω between U1 pin 1 and 255
- Figure E-2. Wiring Diagram 256
- Rev. 5 E–5 257
- E–6 Rev. 5 258
- Appendix F 259
- ASYNCHRONOUS OVERHEAD 259
- CHANNEL UNIT 259
- F–2 Rev. 5 260
- RECEIVE SECTION 261
- TRANSMIT SECTION 261
- F.1.1 Terrestrial Interface 262
- F.1.2 Multiplexer 264
- F.1.3 Demultiplexer 264
- F.1.4 Plesiochronous Buffer 265
- F.4.1 AUPC 268
- Rev. 5 F–11 269
- F.5 Front Panel Operation 270
- F.5.2 Menu Explanations 278
- Refer to Table F-4 279
- to move the flashing 279
- Refer to Table F-5 281
- Refer to Table F-6 283
- Refer to Table F-7 286
- F.5.2.2 Select Monitor 287
- F.5.2.3 Select Faults 288
- F.5.2.5 Select Remote 292
- F.5.2.5.2 Remote Monitor 292
- F.5.2.6 Select Utility 293
- F–38 Rev. 5 296
- Appendix G 297
- TROJAN INTERFACE 297
- G–2 Rev. 5 298
- G–4 Rev. 5 300
- G.2 Connector Pinouts 301
- G.3 Specification 302
- G.4 Configuration Guide 303
- G.4.3 Interface Defaults 304
- G.5 Front Panel Operation 305
- G–10 Rev. 5 306
- G.5.2.5 Select Utility 311
- G.6.1 General 312
- G.6.1.1 Message Structure 312
- G.6.1.1.1 Start Character 313
- G.6.1.1.2 Device Address 313
- G.6.2 Command/Response 314
- G.6.3 End Character 314
- G.6.4.1 Modulator 315
- G.6.4.1.2 Set RF Output 315
- G.6.4.1.3 Modulator Rate 316
- G.6.4.2 Demodulator 319
- G.6.4.2.2 Demodulator Rate 319
- G.6.4.2.3 Descramble Enable 321
- G.6.4.2.4 IF Loopback 321
- G.6.4.2.5 RF Loopback 321
- G.6.4.2.9 Sweep Width Range 323
- G.6.4.2.10 Sweep Direction 323
- G.6.4.3.1 Baseband Loopback 324
- G.6.4.3.2 Transmit Clock 324
- G.6.4.3.3 Receive Clock 324
- G.6.4.4.1 Time of Day 326
- G.6.4.4.2 Date 326
- G.6.4.4.3 Remote 327
- G.6.4.5.1 Configuration 328
- G.6.4.5.3 Modulator Status 331
- G.6.4.5.6.1 Raw BER 332
- G.6.4.5.6.2 Corrected BER 333
- G.6.4.5.7 E 333
- G.6.4.5.8 Modulator Rate 333
- G.6.4.5.9 Demodulator Rate 334
- G.6.4.5.12 Stored Faults 334
- “FAM_” command definition 337
- G.6.4.5.16 Change Status 339
- G.6.4.5.17 Equipment Type 340
- Glossary 341
- OSC Oscillator 344
- METRIC CONVERSIONS 347
- Units of Length 347
- Temperature Conversions 347
- Units of Weight 347
- 480 • 333 • 2200 PHONE 348
- 480 • 333 • 2161 348
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