Name: Motorola ASTRO Digital Spectra
Brand: Motorola
Rating: 5 (1 reviews)

Foreword4

Commercial Warranty19

Limited Warranty19

Model Numbering, Charts, and Specifications23

Chapter 1 Introduction47

Chapter 2 General Overview49

Chapter 3 Theory of Operation59

RF Board59
- General59
- Figure 3-1. Prescaler IC Block Diagram60
- Figure 3-2. Synthesizer IC Block Diagram60
- Synthesizer61
- Receiver Back-End64
  - First if64
  - Abacus II IC65
Command Board66
- Microcontroller and Support Ics66
- Serial Input/Output IC66
- Power-Up/-Down Sequence67
Regulators68
Reset Circuits68
Table 3-1. Integrated Circuits Voltages68
Serial Communications on the External Bus69
Figure 3-5. Power-On Reset69
Synchronous Serial Bus (MOSI)70
Received Audio70
Microphone Audio70
Transmit Deviation71
Line Driver71
Flash Programming71
Encryption Voltages71
Regulator and Power-Control IC72
Figure 3-6. Transmitter Attack Time72
ASTRO Spectra VOCON Board73
- General73
- Controller Section73
- Figure 3-7. VOCON Board - Controller Section74
- Vocoder Section75
- RX Signal Path76
- Figure 3-8. VOCON Board - Vocoder Section76
- Figure 3-9. DSP RSSI Port - RX Mode77
- TX Signal Path79
- Figure 3-10. DSP RSSI Port - TX Mode79
- Controller Bootstrap and Asynchronous Buses80
- Figure 3-11. Host SB9600 and RS232 Ports81
- Vocoder Bootstrap82
- Serial Peripheral Interface (SPI) Bus82
- Controller Memory Map82
- Figure 3-12. Controller Memory Mapping83
- Vocoder Memory Map84
- Figure 3-13. Vocoder Memory Mapping85
- MCU System Clock86
- DSP System Clock86
- Radio Power-Up/Power-Down Sequence86
- VOCON Board Signals87
- Table 3-2. VOCON Board Address Bus (A) Pinouts87
- Table 3-3. VOCON Board Address Bus (HA) Pinouts88
- Table 3-4. VOCON Board Data Bus (D) Pinouts88
- Table 3-5. VOCON Board Data Bus (HD) Pinouts89
- Table 3-6. U204 (MCU)90
- Table 3-7. U206 (SLIC)91
- Vocon U405 (Dsp)93
- Table 3-9. VOCON U406 (ADSIC)94
ASTRO Spectra Plus VOCON Board96
- General96
- ASTRO Spectra Plus Controller Section96
- ASTRO Spectra Plus Vocoder Section97
- Figure 3-14. ASTRO Spectra Plus VOCON Board - Controller Section97
- Figure 3-15. ASTRO Spectra Plus VOCON Board - Vocoder Section98
- ASTRO Spectra Plus RX Signal Path99
- Figure 3-16. ASTRO Spectra Plus RX Signal Path99
- ASTRO Spectra Plus TX Signal Path100
- Figure 3-17. ASTRO Spectra Plus TX Signal Path100
- ASTRO Spectra Plus Controller Bootstrap and Asynchronous Busses101
- ASTRO Spectra Plus Serial Peripheral Interface Bus102
- ASTRO Spectra Plus MCU and DSP System Clocks102
- Figure 3-18. ASTRO Spectra Plus Host SB9600 and RS232 Ports102
- ASTRO Spectra Plus Voltage Regulators103
- Figure 3-19. ASTRO Spectra Plus VOCON DC Distribution103
- ASTRO Spectra Plus Radio Power-Up/Power-Down Sequence104
Voltage Control Oscillator105
- VHF Band105
- UHF Band106
- 800 Mhz Band108
Receiver Front-End111
- VHF Band111
  - General111
  - Theory of Operation111
- UHF Band111
  - Theory of Operation112
- 800 Mhz Band112
  - General112
Power Amplifiers113
- VHF Band Power Amplifiers113
- UHF Band Power Amplifiers126
- 800 Mhz Band Power Amplifiers135

Chapter 4 Troubleshooting Procedures141

Chapter 5 Troubleshooting Charts217

Chapter 6 Troubleshooting Waveforms243

Chapter 7 Schematics, Component Location Diagrams and Parts Lists257

Appendix A Secure Modules405

Appendix B Replacement Parts Ordering407

Glossary409

Index419

Motorola ASTRO Digital Spectra Service Manual

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Brand	Motorola
Model	ASTRO Digital Spectra
Category	Radio
Language	English