Figure 1-1. Modem, Digital Data MD-921/G (PSK modem).
Chapter 1 INTRODUCTION - TM-11-5820-803-120009
Figure 1-2. PSK modem system interface.
System Application
Figure 1-4. PSK modem viewed from bottom front (bottom cover removed).
Figure 1-5. PSK modem applications.
Tabulated Data
Tabulated Data cont'd - TM-11-5820-803-120015
CHAPTER 2 SERVICE UPON RECEIPT AND INSTALLATION - TM-11-5820-803-120016
Figure 2-1. PSK modem interface.
Figure 2-3. Random data modulation spectrum.
Coding/Decoding Options
Figure 2-4. PSK modem theoretical bit error rate performance for various coding configurations (best case performance).
Figure 2-5. (Eb/No) = C/KT - 10 log RD.
Figure 2-6. Differential encoding and decoding waveshapes.
Coding/Decoding Implementation
Figure 2-7. Coder/decoder signal paths.
Figure 2-8. External coder/decoder interface phasing.
Figure 2-9. Digital user interface.
Figure 2-10. Required standard data and clock input charateristics (normal polarity).
ICF Interfaces
Cable classification
Figure 2-14. Attenuation characteristics of RG-217/U cable.
Figure 2-15. (Eb/No) as a function of signal/noise meter reading.
Figure 2-16. Bit error rate versus signal/noise meter reading for differentially encoded signals using various error coding modes
Figure 2-17. Two PSK modems used in ground relay applications.
Section II. SITE AND SHELTER REQUIREMENTS
Section IV. INSTALLATION INSTRUCTIONS
Figure 2-20. PSK modem, rear view.
Table 2-3. Site Interface (J5) Signal List
Table 2-4. Coder Interface (J6) Signal List
Figure 2-22. Standard clock input inverter switch S1 (viewed from top of input interface card, SM-D-742037, A2AA2A4).
Figure 2-25. LOS/cable driver output level selection S1
Figure 2-27. LOS/cable receiver and decoder adjustments.
Table 2-5. Direct Digital Output Interface Polarity Selection.
Table 2-8. Operation of LOS/Cable Receiver and Decoder Selection Switches.
CHAPTER 3 OPERATING INSTRUCTIONS - TM-11-5820-803-120044
Table 3-1. Operator Controls, Indicators, and Connectors
Table 3-1. Operator Controls, Indicators, and Connectors-Continued - TM-11-5820-803-120046
Table 3-1. Operator Controls, Indicators, and Connectors-Continued - TM-11-5820-803-120047
Table 3-2. Operational Switch Settings.
Table 3-3. Self-Test Initial Switch Settings.
Receive Link Test Procedure
Stopping Procedure for Standby Condition
Chapter 4 OPERATOR/CREW MAINTENANCE INSTRUCTIONS - TM-11-5820-803-120052
Table 4-1. Preventive Maintenance Checks and Services (Continued)
Table 4-4. BER Test Control Settings.
Cleaning - TM-11-5820-803-120055
Chapter 5 ORGANIZATIONAL MAINTENANCE INSTRUCTIONS - TM-11-5820-803-120056
Section III. ORGANIZATIONAL MAINTENANCE TROUBLESHOOTING AND REPAIR
Table 5-3. Power Supply-measurements.
Figure 5-2. Thumbwheel switch, assembly Terminal boards.
Figure 5-3. Power supply removal and installation.
Power Supply Removal and Reinstallation Procedures
APPENDIX A REFERENCES - TM-11-5820-803-120062
APPENDIX C MAINTENANCE ALLOCATION
Tool and Test Equipment Requirements - TM-11-5820-803-120064
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120066
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120067
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120068
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120069
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120070
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120071
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120072
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120073
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120074
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120075
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120076
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120077
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120078
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120079
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120080
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120081
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120082
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120083
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120084
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120085
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120086
TM-11-5820-803-12 Modem Digital Data MD-921/G (NSN 5820-00-155-8581) Manual
Chapter 1 INTRODUCTION - TM-11-5820-803-120009
Figure 1-2. PSK modem system interface.
System Application
Figure 1-4. PSK modem viewed from bottom front (bottom cover removed).
Figure 1-5. PSK modem applications.
Tabulated Data
Tabulated Data cont'd - TM-11-5820-803-120015
CHAPTER 2 SERVICE UPON RECEIPT AND INSTALLATION - TM-11-5820-803-120016
Figure 2-1. PSK modem interface.
Figure 2-3. Random data modulation spectrum.
Coding/Decoding Options
Figure 2-4. PSK modem theoretical bit error rate performance for various coding configurations (best case performance).
Figure 2-5. (Eb/No) = C/KT - 10 log RD.
Figure 2-6. Differential encoding and decoding waveshapes.
Coding/Decoding Implementation
Figure 2-7. Coder/decoder signal paths.
Figure 2-8. External coder/decoder interface phasing.
Figure 2-9. Digital user interface.
Figure 2-10. Required standard data and clock input charateristics (normal polarity).
ICF Interfaces
Cable classification
Figure 2-14. Attenuation characteristics of RG-217/U cable.
Figure 2-15. (Eb/No) as a function of signal/noise meter reading.
Figure 2-16. Bit error rate versus signal/noise meter reading for differentially encoded signals using various error coding modes
Figure 2-17. Two PSK modems used in ground relay applications.
Section II. SITE AND SHELTER REQUIREMENTS
Section IV. INSTALLATION INSTRUCTIONS
Figure 2-20. PSK modem, rear view.
Table 2-3. Site Interface (J5) Signal List
Table 2-4. Coder Interface (J6) Signal List
Figure 2-22. Standard clock input inverter switch S1 (viewed from top of input interface card, SM-D-742037, A2AA2A4).
Figure 2-25. LOS/cable driver output level selection S1
Figure 2-27. LOS/cable receiver and decoder adjustments.
Table 2-5. Direct Digital Output Interface Polarity Selection.
Table 2-8. Operation of LOS/Cable Receiver and Decoder Selection Switches.
CHAPTER 3 OPERATING INSTRUCTIONS - TM-11-5820-803-120044
Table 3-1. Operator Controls, Indicators, and Connectors
Table 3-1. Operator Controls, Indicators, and Connectors-Continued - TM-11-5820-803-120046
Table 3-1. Operator Controls, Indicators, and Connectors-Continued - TM-11-5820-803-120047
Table 3-2. Operational Switch Settings.
Table 3-3. Self-Test Initial Switch Settings.
Receive Link Test Procedure
Stopping Procedure for Standby Condition
Chapter 4 OPERATOR/CREW MAINTENANCE INSTRUCTIONS - TM-11-5820-803-120052
Table 4-1. Preventive Maintenance Checks and Services (Continued)
Table 4-4. BER Test Control Settings.
Cleaning - TM-11-5820-803-120055
Chapter 5 ORGANIZATIONAL MAINTENANCE INSTRUCTIONS - TM-11-5820-803-120056
Section III. ORGANIZATIONAL MAINTENANCE TROUBLESHOOTING AND REPAIR
Table 5-3. Power Supply-measurements.
Figure 5-2. Thumbwheel switch, assembly Terminal boards.
Figure 5-3. Power supply removal and installation.
Power Supply Removal and Reinstallation Procedures
APPENDIX A REFERENCES - TM-11-5820-803-120062
APPENDIX C MAINTENANCE ALLOCATION
Tool and Test Equipment Requirements - TM-11-5820-803-120064
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120066
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120067
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120068
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120069
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120070
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120071
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120072
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120073
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120074
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120075
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120076
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120077
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120078
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120079
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120080
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120081
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120082
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120083
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120084
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120085
SECTION II. MAINTENANCE ALLOCATION CHART FOR MODEM, DIGITAL DATA-PHASE SHIFT KEYING MD-921/G cont'd - TM-11-5820-803-120086
TM-11-5820-803-12 Modem Digital Data MD-921/G (NSN 5820-00-155-8581) Manual
