IPSeries IPM8 Mobile Radio Product Owner’s Manual Revision Date: June 13, 2006 Document #: 516-80511-POM Revision: C Copyright 2006 IPMobileNet, Inc.
The term “IC”: before the radio certification number only signifies that Industry of Canada technical specifications were met. Operation is subject to the following two (2) conditions: (1) this devise may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of this device. The following U.S. Patents apply to this product: U.S.
TABLE OF CONTENTS SECTION 1: THEORY OF OPERATION ................................................................................. 3 General Block Diagram................................................................................................ 3 General Block Diagram Definitions..................................................................... 3 IPM8 Mobile Radio Section Descriptions................................................................... 5 Microcontroller .............................
SECTION 1: THEORY OF OEPRATION Figure 1: General Block Diagram General Block Diagram Definitions For increased data security, the modem supports the Federal Government developed Digital Encryption Standard (DES) data encryption and decryption protocols. This capability requires installation of third party, Internet Protocol (IP) compliant DES encryption and decryption software on the system. The IPM8 mobile radio is comprised of two (2) circuit boards, the digital board and the RF board.
SECTION 1: THEORY OF OPERATION The RF circuit board contains the following sections: Transmit Processing Circuitry that amplifies the analog audio signal from the modem and uses it to modulate the voltage controlled oscillator (VCO) and 10 MHz reference oscillator in the injection synthesizer section. Modulating the VCO and reference oscillator simultaneously results in a higher quality FM signal. Injection Synthesizer Provides programmable, ultra stable signals for the radio.
SECTION 1: THEORY OF OPERATION IPM8 Mobile Radio Section Descriptions The IPM8 Mobile Radio works within a frequency range of 806 to 824 MHz and requires a 1/4-wavelength antenna. This section provides detailed descriptions of each of the sections within the IPM8 Mobile Radio. Refer to Appendix A to view the IPM8 Mobile Radio Circuit Board Diagram. Microcontroller The microcontroller (U30) is a major component of the radio as it manages the operation of the radio.
SECTION 1: THEORY OF OPERATION Modem The single-chip modem circuit converts parallel data to an analog audio waveform for transmission and analog audio from a receiver to parallel data. In addition to the modem functions, the chip provides forward error detection and correction (FEC), bit interleaving and Viterbi Soft Decision Algorithms for more robust data communications. The microcontroller section controls the modem operation. Address bus, address/data bus, and control lines operate the modem chip.
SECTION 1: THEORY OF OPERATION Receiver 1 Front-End This section contains components that include several RF Bandpass filters, a low-noise amplifier, and a MMIC mixer. Incoming signals pass through one (1) pre-selector band pass filter (FL3) that selectively provides a high degree of out-of-band signal rejection. An RF amplifier (U35) amplifies the selected signals and is followed by a SAW filter (FL4). The output from FL4 passes through a mixer (U4).
SECTION 1: THEORY OF OPERATION The lower op amp (U9B) amplifies the signal from the low pass filter and applies it to the VCO via the VCOMOD output. Pot RV2 and RV1 are used to adjust maximum deviation. Injection Synthesizer The synthesizer chip (U14) 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 2: ANTENNA CONFIGURATION Antenna Configuration Two (2) antennas are mounted and installed on the roof of the vehicle using specific measurements for distance. To mount and install the antennas, perform the following steps: Step 1 Install antennas (see the figure below). 1 2 Observe correct separation between antennas (refer to Table 8: Mobile Antenna Distance Matrix).
SECTION 2: ANTENNA CONFIGURATION The previous figure represents the recommended front-to-rear antenna installation. The receiver antenna (RX2) should be the antenna nearest to the light bar. Step 3 All antenna mounts must be environmentally tight. Install or use O-rings to seal the antenna base to the rooftop of the vehicle. Step 4 Route the coaxial cables to the mobile radio through one of the hollow spaces in the roof supports into the trunk compartment where the high speed mobile radio is mounted.
SECTION 2: ANTENNA CONFIGURATION Measuring Insertion Loss To measure Insertion Loss of an unterminated length of coax, perform the following steps: Step 1 Connect the antenna to be tested to the appropriate Antenna Analyst. Step 2 Turn on the Antenna Analyst and the Return Loss is displayed in dB to the left of the VSWR curve. Step 3 To switch from the RETL mode to VSWR mode, refer back to the previous set of instructions. Divide the result by two (2).
SECTION 3: FACTORY TEST PROCEDURE Equipment List The following table lists the equipment required to perform the IPM8 Mobile Radio Factory Test Procedure: QTY 2 1 DESCRIPTION MANUFACTURER PC’s One for Mobile One for Base Service Monitor – Communication Test Set Windows 9X w/ IPMessage AVR MODEL HP HP8920B or equivalent Tektronix Fluke 77 or equivalent Astron RM35A Tektronix TDS 460A Pasternack PE7021-40 or equivalent 1 Digital multi-meter 1 DC power supply w/ ammeter, 13.
SECTION 3: 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 IPM8 Mobile Radio: Step 1 Enter the following information on the Test Data Sheet (see Appendix B): 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 3: 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 C206 pin 1, adjust potentiometer R186 for minimum frequency error of +/- 100Hz. Record this value on the Test Data Sheet.
SECTION 3: 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 While monitoring the voltage at RSSI2 Test Point with a DMM, adjust trimmer capacitor C159 to midway between the points where the oscillation stops.
SECTION 3: FACTORY TEST PROCEDURE Power Setting Perform the following steps to adjust the transmit power control: Step 1 Attach a power attenuator to the transmit port of the radio. Step 2 Using the x=2000,19 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.
SECTION 3: FACTORY TEST PROCEDURE Step 3 Attach a digital scope to the base station as described in the next section, Uplink Hardware Timing Verification. Using the x=2000,19 command (which will cause the radio to transmit 19 2000 character messages), verify the following: Transmit frequency of radio is adjusted for minimum frequency error of +/- 100 Hz. The x=2000,19 command will generate different messages with differing DC components.
SECTION 3: 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, and channel 3 is connected to the base station's modem chip select line. The scopes acquisition mode is high-resolution.
SECTION 3: 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, 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 3: 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 3: 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 4: FCC LABEL IPM8 Data Transceiver FCC Label Placement IPM8 Data Transceiver FCC Label 2002 IPMobileNet, Inc.
APPENDIX A: CIRCUIT BOARD DIAGRAMS IPM8 Mobile Radio Digital Circuit Board + + + + + + + IPM8 Mobile Radio RF Circuit Board + 10.00MHz ECS JAPAN + + + + + + + + + IPM8-FCCRpt.
APPENDIX B: IPM8 TEST DATA SHEET Program and Configure Radio Date Serial Number Firmware Revision Tester Adjustment / Alignment Procedures Receiver Injection Parameter Spec Injection Frequency Error at RXINJ1(within +/- 100 Hz of exact injection frequency) U34 pin 4 power level Measured +/- 100 Hz -3 to -5 dBm Receiver 1& 2 Parameter Spec Audio DC Amplitude (1 kHz Test tone @ 5.0 kHz Deviation) 2.5 VDC +/- 1mV Audio AC Amplitude (1 kHz Test tone @ 5.
APPENDIX B: IPM8 TEST DATA SHEET Transmit Section Parameter Spec Transmit Modulation Deviation (4.9 kHz while transmitting 2000 character test message) 4.9 kHz Transmit Data Quality (While transmitting 2000 character test messages to the base station) 240 > Transmit Frequency Error (Transmitting 2000 character test message) Measured +/- 100Hz Transmit Power Control Caution: Do not to exceed 40-Watts RF output power during this test.
APPENDIX B: IPM8 TEST DATA SHEET Data Quality Parameter Receiver 1 Data Quality (While receiving 500 character “pings” from base station, 100 pings min, no errors allowed, CRC errors enabled) Receiver 2 Data Quality (While receiving 500 character “pings” from base station, 100 pings min, no errors allowed, CRC errors enabled) Spec Measured 240> 240> Final Tests Uplink Final Parameter Transmit Frequency Error Transmit Modulation Deviation Spec Measured +/- 100 Hz (Transmitting 19, 2000 character test
APPENDIX B: IPM8 TEST DATA SHEET Downlink Final Parameter Spec Measured Downlink Hardware Timing Verification Sync start (RSSI to CS first going low) Recovered Modulation Levels Frame Sync (From end of Sync to CS second time going low) Receiver 1 Data Quality (While receiving 500 character "pings" from base station, 100 pings min, no errors allowed, CRC errors enabled) LED Receiver 1 Receiver 2 Data Quality (While receiving 500 character "pings" from base station, 100 pings min, no errors allowed, CRC