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Decatur Electronics SI-2 Technical Manual

System interface
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Certified ISO 9001
SYSTEM INTERFACE
SI-2™ AND SI-ARCADE™
Updated 10/02
Proprietary Information — not for copy
or distribution unless authorized
in writing by Decatur Electronics, Inc.
Technical Manual
Decatur Electronics, Inc.
715 Bright Street
Decatur, Illinois 62522
US 800.428.4315
Intl 217.428.4315
Fax 217.428.5302
www.decaturradar.com
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  • Page 1 SYSTEM INTERFACE SI-2™ AND SI-ARCADE™ Technical Manual Decatur Electronics, Inc. 715 Bright Street Decatur, Illinois 62522 US 800.428.4315 Intl 217.428.4315 Fax 217.428.5302 www.decaturradar.com Updated 10/02 Proprietary Information — not for copy or distribution unless authorized in writing by Decatur Electronics, Inc.

  • Page 2: Table Of Contents

    TABLE OF CONTENTS This manual is divided into two sections: SI Arcade, and SI-2 SI ARCADE MODEL Introduction to the System Interface (SI Arcade)™ Unit …………………………………....6 Standard Package ..........................6 Default Settings ..........................6 Options ............................. 6 Operation ........................6 SI Arcade Antenna Operation and Circuitry ……………………………………………....7...
  • Page 3 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...
  • Page 4 Troubleshooting ………………………………………………………………………………......70 Testing ...............................71 Safety ..............................71 Microwave Module Tests ........................72 Antenna Tuning Procedure ......................72 Gunn Oscillator Transmit Frequency ....................72 K-Band Mixer Diode Voltage Adjustment ..................73 Signal Processing PCB Tests ........................74 Display PCB Tests ..........................74 Audio PCB Tests ...........................74 Recommended Test Equipment ......................75 Standard Servicing Equipment ......................75 Constructed Test Equipment .........................77 Anechoic Chamber .........................77...
  • Page 5 SI ARCADE...

  • Page 6: Introduction To The System Interface (Si Arcade)™ Unit

    SI ARCADE INTRODUCTION The System Interface Arcade (SI Arcade) is a stationary mounted sports radar system for K-band antenna operation. The basic SI Arcade processor board is included in the K-band antenna housing. It displays the fastest speeds of the event, which are from processed raw Doppler signals that are generated by the micro- wave transceiver and is specifically designed for tracking the speed of baseballs in an arcade environment.

  • Page 7: Si Arcade Antenna Operation And Circuitry

    SI ARCADE ANTENNA OPERATION AND CIRCUITRY MECHANICAL DRAWINGS ......EXPLODED VIEW ..........10 COMPONENT PLACEMENT MAP ....BLOCK DIAGRAM ........... SCHEMATICS ............ MICROWAVE MODULE ........SIGNAL PROCESSING PCB ......ANTENNA SPECIFICATIONS ......

  • Page 20: Microwave Module

    MICROWAVE MODULE The microwave module of the SI Arcade consists of a turnstile junction, which is coupled to a machined horn lens antenna. The antenna radiates microwave energy with right-hand circular polarization and is designed to receive left-hand polarized energy. The antenna returns the Doppler signal, which is coupled to a turnstile. This provide isolation between the microwave oscillator and receiver section.

  • Page 21: Signal Processing Printed Circuit Board (Pcb) S780-100

    SI ARCADE SIGNAL PROCESSING PRINTED CIRCUIT BOARD (PCB) S780-100 Preamplifiers The heart of the preamplifiers is U9 and U10, MAX410 low-noise low-distortion operational amplifiers. These amplifiers with resistors R29, R31, R33 and capacitor C16 (U9), R30, R32, R34 and C17 (U10) form non- inverting operational amplifier configurations with resistors R31 and R33 (U9) and R32 and R34 (U10), setting the gain at approximately 42dB.

  • Page 22: Digital Signal Processing

    Digital Signal Processing The DSP chip U2, an ADSP-2185 from Analog Devices, performs the following functions: (1) receives digitized Doppler signals from the antenna unit (2) communicates bi-directionally with a serial port device (3) retrieves operational parameters from the flash EPROM (4) detects low voltages (5) filters Doppler signals (6) checks accuracy against an external reference crystal...

  • Page 23: Second Crystal Check

    Second Crystal Check U4, a 74HC4060 counter, generates the second frequency reference that the second crystal check needs. Y2 with resistors R12, R13 and capacitors C4, C5 set the oscillation frequency to 3.6864MHz. The output frequency of U4 at pin 4 is approximately 57,600Hz. This second crystal also provides the clock reference for the external serial port baud rates.

  • Page 24: Flash Memory

    Flash Memory U3, a 1M-bit flash memory chip, holds the software that the DSP chip executes. At power up, the DSP chip boot loads the software in U3 into internal high-speed program memory where program execution takes place. U3 also stores the operational parameters for the radar unit. Low Voltage and RFI Settings Low voltage on the SI-Arcade requires no adjustments and is permanently set to trip around 5.5VDC.

  • Page 25: Serial Communications

    SI ARCADE ANTENNA SPECIFICATIONS Antenna Frequency Nominal Power Output Power Beam Detection Range Type Density Width K-band 24.150GHz ±50 MHz 10mW nominal 0.5 mW/cm 12° 100 ft Processor Serial communications RS232C Data rate 1200 baud Data format 8N2 <ASCII Huns> <ASCII Tens> <ASCII Ones> <CR> Target acquisition time 0.021ms General...

  • Page 26: Parts List

    SI ARACDE PARTS LIST SYSTEM INTERFACE (SI) ARCADE BILL OF MATERIALS LEVEL ITEM# QTY DEI PART# REF# DESCRIPTION S780-100-DR P.C.B. DSP PCB P381-150 15pF 5% 50V NPO CER 0805 CAP P381-220 C2,C3 22pF CAP 50V 5% 0805 P381-330 C5,C16,C27 33pF 5% 50V NPO 0805 CER CAP P381-471 C41,C42, 470pF 50V X7R 10% 0805 CAP...
  • Page 27 LEVEL ITEM# QTY DEI PART# REF# DESCRIPTION P342-1002 R1,R3,R4,R5, 10K MF 1% 1/10W 0805 R6,R7,R8,R9, R10,R15,R16, R20,R35,R36, R39,R41,R46, R49,R52,R54, R55,R56,R57, P342-6652 66.5K MF 1/10W MF1% 0805 P342-4993 499K OHM 1/10W MF 1% 0805 P342-1003 R14,R18,R19, 100K MF 1% 1/10W 0805 R33,R97,R98, P342-3573 357K MF 1% 1/10W 0805...
  • Page 28 SI-2...

  • Page 29: Introduction To The System Interface 2 Directional (Si-2) ™ Unit

    Doppler signals, which are generated by the microwave transceiver. The SI-2 antenna is directional, which means it can be set to track targets moving toward or away from it, and the SI-2 includes an RS232 serial port for communication with, for example, standard numeric display signs, changeable radar message trailers, computers, and conveyer belt controls and can be tailored to meet customer needs.

  • Page 30: System Interface (Si-2) Antenna Operation And Circuitry

    SI-2 ANTENNA OPERATION AND CIRCUITRY MECHANICAL DRAWINGS ......31 EXPLODED VIEW .......... 34 BLOCK DIAGRAM ........36 SCHEMATICS ..........37 COMPONENT PLACEMENT MAPS ... 41 MICROWAVE MODULE ........ 44 SIGNAL PROCESSING PCB ......45 ANTENNA SPECIFICATIONS ....... 49...

  • Page 44: Microwave Module

    MICROWAVE MODULE The microwave module of the SI-2 consists of a directional Gunn oscillator assembly, which is connected to a machined horn lens antenna. The antenna radiates and receives the microwave energy and returns the Doppler signal to the receiver section. The receiver section contains two coupled high-sensitivity mixer diodes that receive the Doppler-shifted transmitted signal and a small amount of the microwave energy from the oscillator.

  • Page 45: Signal Processing Printed Circuit Board (Pcb) S780-100

    SI-2 SIGNAL PROCESSING PRINTED CIRCUIT BOARD (PCB) S780-100 Preamplifiers The heart of the preamplifiers is U9 and U10, MAX410 low-noise low-distortion operational amplifiers. These amplifiers with resistors R29, R31, R33 and capacitor C16 (U9), R30, R32, R34 and C17 (U10) form non- inverting operational amplifier configurations with resistors R31 and R33 (U9) and R32 and R34 (U10), setting the gain at approximately 42dB.

  • Page 46: Digital Signal Processing

    Digital Signal Processing The DSP chip U2, an ADSP-2185 from Analog Devices, performs the following functions: (1) receives digitized Doppler signals from the antenna unit (2) communicates bi-directionally with a serial port device (3) retrieves operational parameters from the flash EPROM (4) detects low voltages (5) filters Doppler signals (6) checks accuracy against an external reference crystal...

  • Page 47: Second Crystal Check

    DSP chip. Power Supply Power supplied externally to the SI-2 enters the DSP board at JP5 and is routed to two regulators, U6 and U7. U6, the main power regulator, is configured to supply +5VDC to all logic and analog circuits.

  • Page 48: Flash Memory

    U3 also stores the operational parameters for the radar unit. Low Voltage and RFI Settings Low voltage on the SI-2 requires no adjustments and is permanently set to trip around 5.5VDC. The RFI trip level is permanently set to trip at normally offending levels and requires no adjustments.

  • Page 49: Serial Communications

    SI-2 ANTENNA SPECIFICATIONS Antenna Frequency Nominal Power Output Power Beam Detection Range Type Density Width K-band 24.150GHz ±50 MHz 10mW nominal 0.5 mW/cm 12° 100 ft Processor Serial communications RS232C Data rate Baud rates 1200, 2400, 9600, 19200 Data format (Various, see selectable RS232 output protocols below.)

  • Page 50: Output Rate

    Output Rate Selectable output rate When target speed changes 1-10 times per second When polled Data hold time: 1-10 seconds Low/high speed cutoff Power Input voltage 10.8 – 24VDC Angle and Direction Two angle corrections from 0° – 45° Direction (D) report switch ON/OFF D = + (approaching target) D = –...

  • Page 51: Si-2 Control Functions

    SI-2 CONTROL FUNCTIONS Software Installation Instructions 1. Insert the SI-2 disk in the floppy disk drive and/or downloaded SI2Config.exe file. Place it in the folder in which you want it to reside. SI2Config.exe icon 2. Click the Windows ® Start button and choose Run from the Startup menu.

  • Page 52: Software Configuration Instructions

    Software Configuration Instructions You configure the SI-2 radar device using the SI-2’s attached RS232 cable and an IBM-compatible PC with SI-2 configuration software. To begin the configuration, you need the following: SI-2 radar device SI-2 RS232 programming cable ® IBM-compatible PC with Windows...
  • Page 53 9. Click Configure. 10. Within 5 seconds of clicking configure, turn on the power supply. 11. When the program establishes the connection with the SI-2, the Establishing Connection message will appear in the dialog box, as Figure 3 shows. Figure 3 Establishing connection with the SI-2 If the program times out before you turn on the power supply, the No Unit Detected dialog box (Figure 4) appears.
  • Page 54 After you establish a successful connection with the SI-2 device, the main dialog box appears, as Figure 5 shows. This dialog box is where you choose configuration options and modify existing settings. IMPORTANT: See Appendix A Table of OEM Supported Settings in the back of this manual for the specific settings to use in this dialog box.
  • Page 55 Low Speed Cutoff The Low Speed Cutoff option is the lowest speed within the valid speed range that you want the SI-2 to report (see the Valid Speed Ranges above.) Be sure to enter a speed that is less than the highest speed. (Note: This is the speed before the cosine error corrections are applied.)
  • Page 56 The Report option lets you choose to report the activity of all targets, approaching targets, or receding targets. During the first minute after power up, the SI-2 will report all targets regardless of the selection above. This allows you to test the unit with a tuning fork.

  • Page 57: Si-2 Parts List

    SI-2 PARTS LIST SYSTEM INTERFACE (SI-2) BILL OF MATERIALS LEVEL ITEM# QTY DEI PART# REF# DESCRIPTION S780-100-DR DSP PCB P381-0150 15pF CAP 50V 5% 0805 NPO CER P381-0200 C2,C3 22pF CAP 50V 5% 0805 NPO CER P381-0300 C5,C16,C17, 33pF CAP 50V 5% 0805...
  • Page 58 LEVEL ITEM# QTY DEI PART# REF# DESCRIPTION P342-2210 R25,R26,R27,R28 221 OHM MF 1% 1/10W 0805 P342-1001 R2,R66 1K MF 1% 1/10W 0805 P342-1541 1.54K MF 1% 1/10W 0805 P342-2211 R13,R29,R30 2.21K MF 1% 1/10W 0805 P342-4991 4.99K MF 1% 1/10W 0805 P342-1002 R1,R3,R4,R5, 10K MF 1% 1/10W 0805...

  • Page 59: Option Card (S790-6) Operation And Circuitry (For Both Si Arcade And Si-2)

    SI-2 OPTION CARD OPERATION AND CIRCUITRY BLOCK DIAGRAM ........60 SCHEMATICS ..........61 COMPONENT PLACEMENT MAPS ... 64 CIRCUITRY DESCRIPTION ......68...

  • Page 68: Option Card Circuitry Description

    U2, a LM2595 switching adjustable voltage regulator from National Seminconductor, provides main power for the SI-2 main board. Pin 2 of U2 is the main power input, while pin 5 controls the output state of the regulator. Schottky diode D6 with L2 provide the main circuit components for the switching power supply. Resistor R4, R5 set the output voltage at around 7.2 volts DC.

  • Page 69: Si-2 Parts List

    SI-2 PARTS LIST SYSTEM INTERFACE (SI-2) OPTION CARD BILL OF MATERIALS LEVEL ITEM# QTY DEI PART# REF# DESCRIPTION S790-6 OPTION CARD PCB P381-103 C9,C10 .01uF 10% 50V X7R 0805 P381-104 C1,C2,C3,C4 .1uF 10% 50V X7R CER 0805 CAP P342-1001 1K 1% 1/10W 0805 MF P342-1541 1.54K 1% 1/10W 0805 MF...

  • Page 70: Troubleshooting

    TROUBLESHOOTING Symptom Probable Cause Remedy Spurious Speeds Misaligned antenna 1. Align antenna to the target’s travel direction. 2. Direct antenna away from moving objects that are not intended to be targets (including cooling fans and other rotating objects). 3. Direct the antenna away from electrically noisy circuitry (such as strong lighting, neon lights, and exposed clock oscillators) and multiplexed displays.

  • Page 71: Testing

    TESTING SAFETY Carry out all radar unit service at an approved factory service site and implement all electrostatic discharge (ESD) safeguards. The repair work area needs to include grounded work mats and wrist straps. Microwave Gunn and mixer diodes are sensitive to ESD and require extra precautions. Please contact the factory for additional information about equipping your service site.

  • Page 72: Microwave Module Tests

    MICROWAVE MODULE TESTS Antenna Tuning Procedure Gunn Oscillator Transmit Frequency You need to check the antenna transmit frequency before making any adjustments to the antenna. Required equipment: (1) Microwave frequency converter capable of reading up to 25GHz (2) K-band horn with at least a 10dB gain (3) Waveguide to coax transition (4) Low-loss coax cable Set up the equipment as follows:...

  • Page 73: K-Band Mixer Diode Voltage Adjustment

    (3) Place the leads of the DVM across the mixer diode. (4) Loosen the locking nut. (5) If you are adjusting the SI-2, adjust turnstile-tuning screw, so the voltage is minimized. If you are adjusting the SI-Arcade, adjust the voltage to .150VDC (150mVDC).

  • Page 74: Signal Processing Pcb Tests

    SIGNAL PROCESSING PCB TESTS See the Signal Processing PCB schematics and have an understanding of the theory of operation. DISPLAY PCB TESTS See the Display PCB schematics and have an understanding of the theory of operation. AUDIO PCB TESTS See the Audio PCB schematics and have an understanding of the theory of operation.

  • Page 75: Recommended Test Equipment

    For newer models, it is sometimes necessary to monitor the signals coming from the micropro- cessor. Some of these areas require at least a 60MHz resolution to properly monitor. Also, when working with the Genesis model radar units, Decatur Electronics highly recommends using oscilloscopes with dual trace capability and a storage feature.
  • Page 76 4. Soldering and De-soldering Stations De-soldering stations Pace Model MVT-101 Automated Production Equipment Corp. Model EX525 Temperature Controlled Soldering Iron Weller Model TCPS Surface Mount De-soldering Station Pace Model MBT-201A You must have the correct soldering and de-soldering stations, which are temperature controlled and groundable.

  • Page 77: Constructed Test Equipment

    K-band horn, lens, and turnstile assembly. The turnstile assem- bly lets you test the Decatur Electronics line of products. If you need to test other product lines, you might find it necessary to use a feed horn, attenuator, and crystal detector.

  • Page 78: Equipment Manufacturers

    EQUIPMENT MANUFACTURERS EIP Microwave, Inc. 1589 Centre Pointe Drive Milpitas, CA 95035 (800) 232-3471 General Microwave Corp. 5500 New Horizon Boulevard Amityville, NY 11701 (516) 226-8900 fax: (516) 226-8966 Hewlett-Packard Corp. P.O. Box 4026 Englewood, CO 80155-4026 (800) 452-4844 For microwave absorbing material: Advanced Electromagnetics, Inc.

  • Page 79: Appendix A Table Of Oem Supported Settings

    APPENDIX A: TABLE OF OEM SUPPORTED SETTINGS You will want to verify that these settings are current before working with them. Settings could have changed since the printing of this manual. American Signal Co. Serial communication protocol set for 8N1 <ASCII hundreds> <ASCII tens> <ASCII ones> <CR> High-speed 5-200 mph Sensitivity setting...
  • Page 80 Mighty Mover Trailers Serial communication protocol set for 8N2 <ASCII tens> <ASCII ones> <ASCII tenths> <,> <ASCII 000.0> <CR> High-speed 5-200 mph Sensitivity setting Update Rate On speed change only Data hold setting 2 sec Zero speed report On no target, set once every 2 seconds Low Speed cutoff 5 mph High Speed cutoff...
  • Page 81 Texas Transportation Institute Serial communication protocol set for 8N1 <ASCII*> <D> <ASCII hundreds> <ASCII tens> <ASCII ones> <.> <ASCII tenths> <,> <3 ASCII characters represent signal strength in dB 000 through 255> <CR> <LF> Polling string 8N1 <ASCII *> <ASCII P> <CR> Low-speed 1-70 mph Sensitivity setting...

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