Decatur Electronics SI-2 Technical Manual page 3

SYSTEM INTERFACE DIRECTIONAL (SI-2) MODEL
Introduction to the System Interface 2 Directional (SI-2)
Standard Package .............................................................................................................................29
Default Settings .............................................................................................................. .29
Options .....................................................................................................................29
System Interface (SI-2) Antenna Operation and Circuitry ...............................................................30
Mechanical Drawings ..........................................................................................................................31
Exploded View .....................................................................................................................34
Block Diagram .........................................................................................................................................36
Schematics ...................................................................................................................37
Component Placement Maps ....................................................................................................41
Microwave Module ...........................................................................................................44
Signal Processing Printed Circuit Board (PCB) S780-100 ..................................................................45
Preamplifiers ............................................................................................................................. 45
Analog to Digital (A/D) Converter .................................................................................................45
Digital Signal Processing ...................................................................................................46
Second Crystal Check .............................................................................................47
Reset Circuit .....................................................................................................................47
Power Supply .............................................................................................................47
Flash Memory ...................................................................................................................48
Low Voltage and RFI Settings .......................................................................................................48
Serial Communications ........................................................................................................48
Antenna Specifications ..................................................................................49
Processor ................................................................................................................49
General .............................................................................................................49
Mechanical ................................................................................................................49
Accuracy ............................................................................................................49
DB-9 Connector Pintout .....................................................................................................49
Output Rate ............................................................................................................50
Power ...................................................................................................................50
Angle and Direction ......................................................................................................50
Selectable RS232 Output Protocols ..................................................................................50
Control Functions ..................................................................................................................51
Software Installation Instructions ............................................................................................51
Software Configuration Instructions ........................................................................................52
Parts List .......................................................................................................................57
SI-2 Option Card (S790-6) Operation and Circuitry (For Both SI Arcade and SI-2) ..................................59
Block Diagram ....................................................................................................................................60
Schematics ..........................................................................................................................................61
Component Placement Maps ................................................................................................................64
SI-2 Option Card Circuitry Description ............................................................................................68
Input Protection ..........................................................................................................................68
Voltage Monitoring ......................................................................................................................68
Main Power ................................................................................................................................68
Post Filtering and Fusing ..............................................................................................................68
Theory .......................................................................................................................................68
Parts List ..............................................................................................................................................69
Unit ...........................................29
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