INVADRtm IP8HPV Data Transceiver Owner’s Manual Date Prepared: October 25, 2001 Document Control #: DC-39 Version: C-1 (Special Release) Copyright 2001 IPMobileNet, Inc.
TABLE OF CONTENTS SECTION 1: THEORY OF OPERATION ................................................................................. 3 General Block Diagram................................................................................................ 3 General Block Diagram Definitions..................................................................... 3 Microcontroller .................................................................................................... 5 Support Circuitry .................
SECTION 1: THEORY OF OPERATION General Block Diagram DATA Input / Output MicroController Injection Synthesizer Transmitter Transmit Processing Baseband Routing Receiver 1 Modem Receiver 2 General Block Diagram Definitions The standard IP circuit board contains ten (10) sections defined below. Input/Output Circuitry associated with the radio’s DB9 data connector providing all the RS232 data and handshake functions, including the necessary level changes.
SECTION 1: THEORY OF OPERATION Low Side Injection In the receive mode, the synthesizer provides a local oscillator signal of 45 MHz below the selected receive channel frequency. Baseband Routing Allows the microcontroller to select one of the two diversity receiver audio outputs for demodulation by the modem. Switching is done by the microcontroller comparing the Received Signal Strength Indication (RSSI) outputs from each receiver.
SECTION 1: THEORY OF OPERATION IP8 HPV Data Transceiver Section Descriptions This section provides detailed descriptions of each of the sections within the IP8 HPV Data Transceiver. Refer to Appendix A to view the IP8 HPV Data Transceiver Circuit Board Diagram (Top and Bottom views). Microcontroller The microcontroller is a major component of the radio as it manages the operation of the radio loading the selected transmit/receive frequencies into the injection sythesizer.
SECTION 1: THEORY OF OPERATION (870MODE line), it provides a serial interface for the MDT-870. Notice that only the RX data (RXD) and all handshake lines are buffered. Transmit data (TXD) is derived from a modem interface circuit. Injection Synthesizer The synthesizer chip is the major contributor of the injection synthesizer. This device contains the key components of a phase locked loop (PLL), including a prescaler, programmable divider, and phase detector.
SECTION 1: THEORY OF OPERATION Receiver 1 IF This section consists of 1 IF subsystem. The major contributor of the IF subsystem a complete 45 MHz superheterodyne receiver chip incorporating a mixer/oscillator, two limiting intermediate frequency amplifiers, quadrature detector, logarithmic received signal strength indicator (RSSI), voltage regulator and audio and RSSI op amps. Incoming 45 MHz signals appearing at RX1_45MHz pass through a low-voltage high performance monolithic FM IF system.
SECTION 1: THEORY OF OPERATION Power and Analog Ground These sections consist of the power supplies and transmit control circuitry. Power from the vehicle’s battery appears at VBATT. A diode protects the voltage regulators by clamping any transient spikes on the supply line. Such spikes typically occur while the engine is started.
SECTION 1: THEORY OF OPERATION VLogic and Digital Ground The VLogic and Digital Ground section consists of a pulse-width modulation (PWM) step-down DC-DC converter (U20) that provides an adjustable output. It also reduces noise in sensitive communications applications and minimizes drop out voltage. An external Schottky diode (D2) is required as an output rectifier to pass inductor current during the second half of each cycle to prevent the slow internal diode of the N-channel MOSFET from turning on.
SECTION 2: FACTORY TEST PROCEDURE Equipment List The following table lists the equipment required to perform the IP8 HPV Mobile Radio Factory Test Procedure: QTY DESCRIPTION MANUFACTURE MODEL 1 Communications Test Set HP Hp 8920A or B 1 Hi Freq Probe HP HP8502A 1 Power Supply for HP8502A Probe HP HP1122A 1 4 Channel Scope Tektronix TDS 460A 2 General Propose Scope Probe 1 DVM Tektronix Fluke DMM912 77 1 Attenuator 1 IP8 HPV Base Station 1 IP Network Controller 2 12V Power S
SECTION 2: FACTORY TEST PROCEDURE Programming and Configuring Mobile Radio Once the appropriate equipment for performing the factory test are gathered, perform the following steps to program and configure an IP8 HPV Mobile Radio: Step 1 Enter the following information on the Mobile Radio Performance Test Data Sheet: Radio Serial number Date test being performed Tester's Name Step 2 Program the radio to the current Firmware revision using the AVR programming utility.
SECTION 2: FACTORY TEST PROCEDURE Adjustment / Alignment Procedures Receiver Injection Perform the following steps to adjust the receiver injection and injection frequency: Step 1 While monitoring the receiver injection frequency at C64, adjust potentiometer RV3 for minimum frequency error of +/- 100Hz. Record this value on the Mobile Radio Performance Test Data Sheet. Step 2 RX1 - While monitoring the 44.
SECTION 2: FACTORY TEST PROCEDURE Receiver 2 Perform the following steps to adjust receiver 2: Step 1 Inject an on-frequency carrier signal with an amplitude of -80 dBm, modulated with a 1 kHz test tone at +/- 5.0 kHz deviation into Receiver 2's antenna port. Step 2 The RSSI value should be between 1.3 and 1.5 VDC for a properly tuned radio. Record this value on the Mobile Radio Performance Test Data Sheet.
SECTION 2: FACTORY TEST PROCEDURE Transmit Power Control Perform the following steps to adjust the transmit power control: Step 1 Using the x=2000,n command of IPMessage, and while monitoring the transmit power level on the HP communications test set, check the level of the transmit power. Using IPMessage set the power setting to txpower=0. The radio should have an output power level of approximately 1 mW. Record this value on the Mobile Radio Performance Test Data Sheet.
SECTION 2: FACTORY TEST PROCEDURE Final Test A final test must be performed prior to shipping the IP8 HPV mobile radio to the customer. This final test will verify that the timing characteristics are correct and that both transmit and receive data quality readings are consistently high. Perform the following steps for the final test: Step 1 Attach the 40dB 100-Watt power attenuator to the transmit port of the radio. Step 2 Program the radio for full power operation.
SECTION 2: FACTORY TEST PROCEDURE antenna on the RX2 port and verifying RX2 is selected by observing the RX2 LED on the mobile radio. Step 11 Reset CRC =0 Disable on the radio Step 12 In IPMessage, type the ? command to radio. Copy the radio settings and paste them into the IP8HPV Mobile Radio Performance Test Data File. Step 13 Perform a close visual inspection of the radio closely inspecting manufacturing related problems (loose screws, solder particles, etc.). ~\Technical Documentation\System Manua
SECTION 2: FACTORY TEST PROCEDURE Uplink Hardware Timing Verification Figure 2-1 below displays an oscilloscope plot of an uplink data message from the mobile to the base station. Channel 1 is connected to the base station's RSSI (XXX-12), channel 2 is connected to the base station's recovered modulation (TP6), and channel 3 is connected to the base station's modem chip select line. The scopes acquisition mode is high-resolution.
SECTION 2: FACTORY TEST PROCEDURE Figure 2-2 displays another oscilloscope plot of an up-link data message from the mobile to the base station. As in the last plot, channel 1 is connected to the base station's RSSI (J5-12), channel 2 is connected to the base station's recovered modulation test point (TP6), and channel 3 is connected to the base station's modem chip select line (U16-13). The scope's acquisition mode is now in the peak detect mode.
SECTION 2: FACTORY TEST PROCEDURE Downlink Hardware Timing Verification Figure 2-3 displays a plot of the downlink timing characteristics. Channel 1 is connected to RSSI, channel 2 is connected to recovered audio, and channel 3 is connected to the modem CS pin. The scope is in the high-resolution acquisition mode. There is a very short period of quiet time (no modulation) followed by approximately 12 milliseconds of modem synchronization time (sync time).
SECTION 2: FACTORY TEST PROCEDURE The plot in Figure 2-4 is the same as before but now the scope is in the peak detect acquisition mode. After the mobile radio detects a step response in the RSSI (caused by a down-link transmission), the radio's microcontroller waits an amount of time equal to the programmed value of the "carrier detect delay time" then instructs the modem to look for frame sync.
SECTION 3: LABEL AND LABEL PLACEMENT INVADR IP8 HPV Data Transceiver FCC Label Placement INVADR IP8 HPV Data Transceiver FCC Label ~\Technical Documentation\System Manuals\FCC-Reports\IP8HPV\IP8HPV-FCCRpt.
APPENDIX A: CIRCUIT BOARD DIAGRAM IP8 HPV Data Transceiver Circuit Board – TOP VIEW ~\Technical Documentation\System Manuals\FCC-Reports\IP8HPV\IP8HPV-FCCRpt.
APPENDIX A: CIRCUIT BOARD DIAGRAM IP8 HPV Data Transceiver Circuit Board – BOTTOM VIEW ~\Technical Documentation\System Manuals\FCC-Reports\IP8HPV\IP8HPV-FCCRpt.
APPENDIX B: IP8 HPV TEST DATA SHEET Program and Configure Radio Date Serial Number Firmware Revision Tester Adjustment / Alignment Procedures Receiver Injection Parameter Spec Measured Injection Frequency Error at +/- 100 Hz RXINJ1(within +/- 100 Hz of exact injection frequency) U8B pin 4 power level +3 to +5 dBm Receiver 1& 2 Parameter Spec RSSI test point CV1A adjustment 1.3 to 1.5 VDC 2.5 VDC +/- 1mV Audio DC Amplitude (1 kHz Test tone @ 5.
APPENDIX B: IP8 HPV TEST DATA SHEET Transmit Section Parameter Transmit Modulation Deviation (5.3 kHz while transmitting 2000 character test message) Transmit Data Quality (While transmitting 2000 character test messages to the base station) Transmit Frequency Error (Transmitting 2000 character test message) Spec Measured 5.
APPENDIX B: IP8 HPV TEST DATA SHEET Data Quality Parameter Spec Measured Receiver 1 Data Quality (While receiving 500 character "pings" from base station, 100 pings min, no errors allowed, CRC errors enabled) 240> Receiver 2 Data Quality (While receiving 500 character "pings" from base station, 100 pings min, no errors allowed, CRC errors enabled) 240> Final Tests Uplink Final Parameter Transmit Frequency Error Spec Measured +/- 500 Hz (Transmitting 19, 2000 character test message) Transmit Modul
APPENDIX B: IP8 HPV TEST DATA SHEET Downlink Final Parameter Spec Measured Downlink Hardware Timing Verification Recovered Modulation Levels 800 mV~ 2.
