Comtech-ef-data CST-5000 User Manual Page 93
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Theory of Operation CST-5000 C-Band Satellite Terminal
5–4 Rev. 9
5.1.2.1 Remote Interface Specification
Refer to Appendix B for information on remote control operation.
5.1.3 Terminal Default Conditions
On initial power-up, the unit will default to the following parameters:
Parameter Default
Baud Rate 9600
Parity Even
Device Address 1
U/C Gain Minimum
D/C Gain Minimum
RF Output OFF
U/C Frequency 6135.00 MHz
D/C Frequency 3925.00 MHz
5.1.4 Theory of Operation
Refer to Figure 5-3 for a functional block diagram of the M&C.
The M&C board performs the following operations:
• Receives the desired frequency from either the remote EIA-232/485 or local
keypad, and after converting it to a synthesizer setting, stores it to the applicable
synthesizer output latch.
• Reads the thermistors located in the up converter, down converter, and HPA, and
converts the signals into temperatures for display.
• Reads the characterization EEPROMs in the up converter, down converter, and
HPA, and calculates an Automatic Gain Control (AGC) voltage based on
frequency and temperature to linearize the respective module.
• Turns the fan on or off, depending on the temperature.
• Receives fault inputs from all modules, and presents them to the remote
EIA-232/485 and the optional local keypad display.
• Performs an initial current sense on the LNA, and stores the reading in the
EEPROM. Subsequent current sense readings are taken and compared to the
initial reading to determine a fault.
- C-Band Satellite Terminal 1
- Installation and O 1
- Errata A 2
- Filename: T_ERRATA 2 3
- Errata B 5
- CST-5000 7
- Customer Support 8
- Table of Contents 9
- Preface CST-5000 10
- CST-5000 Preface 11
- Rev. 9 v 11
- Figures 12
- About this Manual 13
- Related Documents 13
- Conventions and References 13
- Cautions and Warnings 13
- Metric Conversion 14
- Trademarks 14
- Warranty Policy 15
- Limitations of Warranty 15
- Exclusive Remedies 15
- Disclaimer 15
- Rev. 9 1–1 17
- 1.1 Description 18
- Rev. 9 1–3 19
- 1.1.1 Applications 20
- 1.1.4 Outdoor Enclosure 21
- 1.2 Options 22
- 1.2.1 Configurations 22
- 1.2.2 Equipment 23
- 1.3 Specifications 24
- > 250 kHz Carrier Offset 25
- ± 1 dB/575 MHz 27
- ± 3 dB maximum 27
- ± 0.01 ns/MHz maximum 27
- 1–12 Rev. 9 28
- SINGLE THREAD SYSTEM 29
- INSTALLATION 29
- 2.2.1 Included Parts 30
- 2.3 RFT Installation 35
- 2.3.1 Tools Required 36
- 2.3.2.1 Round Pole 37
- 2–10 Rev. 9 38
- Rev. 9 2–11 39
- 2–12 Rev. 9 40
- Rev. 9 2–13 41
- 2–14 Rev. 9 42
- Rev. 9 2–15 43
- 2.3.2.2 Square Pole 44
- 2.3.3 Spar Installation 45
- 2–18 Rev. 9 46
- 2.4 LNA Installation 47
- 2–20 Rev. 9 48
- 2.5 External Connections 49
- 2.5.1 TX/IF Input (J1) 50
- 2.5.2 TX/RF Output (J2) 50
- 2.5.3 RX/IF Output (J3) 50
- 2.5.4 RX/RF Input (J4) 51
- 2.5.5 Prime Power (J5) 51
- 2–24 Rev. 9 52
- 2.5.7 Ground (GND) 54
- REDUNDANT SYSTEM 55
- 3.1 Unpacking 56
- 3.2.1 Included Parts 57
- 3.3 RFT Installation 61
- 3.3.1 Tools Required 62
- 3.3.2.1 Round Pole 63
- 3–10 Rev. 9 64
- Rev. 9 3–11 65
- 3–12 Rev. 9 66
- Rev. 9 3–13 67
- 3.3.2.2 Square Pole 68
- 3.3.3 Spar Installation 69
- 3–16 Rev. 9 70
- Rev. 9 3–17 71
- 3–18 Rev. 9 72
- Rev. 9 3–19 73
- 3.4 External Connections 74
- Rev. 9 3–21 75
- OPERATION 76
- • Configuration (CONFIG) 77
- • Monitor 77
- • Faults 77
- 4.3.1 Front Panel Controls 78
- 4.4 Menu Explanations 79
- 4.4.1 Configuration 80
- 4–6 Rev. 9 81
- 4.4.2 Monitor 84
- 4–10 Rev. 9 85
- 4.4.3 Faults 86
- 4–12 Rev. 9 87
- 4–14 Rev. 9 89
- THEORY OF OPERATION 90
- Figure 5-1. M&C Board 91
- 5.1.1 EEPROM Memory 92
- 5.1.2 Remote Interface 92
- 5.1.4 Theory of Operation 93
- Rev. 9 5–5 94
- 5.1.6 Test Points and LEDs 99
- 5.2.1 Specifications 99
- HIGH STABILIT 100
- OSCILLATOR 100
- 5.3 IF Local Oscillator 101
- 5.3.1 Specifications 101
- Rev. 9 5–13 102
- 5.4.1 Specifications 103
- 5.4.2 Theory of Operation 103
- 5.4 Synthesizer 103
- Rev. 9 5–15 104
- 5.5 Down Converter 105
- 5.5.1 Specifications 106
- 5.5.2 Theory of Operation 107
- 5.6 Up Converter 108
- 5.6.1 Specifications 109
- 5.6.2 Theory of Operation 110
- 5–22 Rev. 9 111
- 6.1 Test Points and LEDs 112
- 6.2 Fault Isolation 113
- Table 6-3. Fault Isolation 114
- Rev. 9 6–5 116
- 6–6 Rev. 9 117
- Rev. 9 6–7 118
- 6–8 Rev. 9 119
- Appendix A 120
- OPTIONS 120
- A–2 Rev. 9 121
- A.1.1.1 Specifications 122
- A.1.2 Synthesizer 122
- A.1.2.1 Specifications 122
- A.1.2.2 Theory of Operation 122
- A–4 Rev. 9 123
- A.1.3 Down Converter 124
- A.1.3.1 Specifications 125
- A.1.3.2 Theory of Operation 126
- A.1.4 Up Converter 127
- A.1.4.1 Specifications 128
- A.1.4.2 Theory of Operation 129
- Rev. 9 A–11 130
- A–12 Rev. 9 131
- A.2.3 M&C Software 132
- A–14 Rev. 9 133
- Appendix B 134
- REMOTE CONTROL OPERATION 134
- B.2 Message Structure 135
- B.2.1 Start Character 135
- B.2.2 Device Address 136
- B.2.3 Command/Response 136
- B.2.4 End Character 137
- Rev. 9 B–5 138
- B–6 Rev. 9 139
- Rev. 9 B–7 140
- B–8 Rev. 9 141
- Glossary 142
- Ω kilo-ohms 143
- METRIC CONVERSIONS 148
- Units of Length 148
- Temperature Conversions 148
- Units of Weight 148
- 480 • 333 • 2200 PHONE 149
- 480 • 333 • 2161 149
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