IPSeries M32150-25 Mobile Radio Product Owner’s Manual Date Released: December 9, 2003 Document #: 516.80518.POM Revision: A Copyright 2003 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 ................................................................................. 4 General Block Diagram................................................................................................ 4 General Block Diagram Definitions..................................................................... 4 M32150-25 Mobile Radio Section Descriptions ......................................................... 6 Microcontroller .................................
SECTION 1: THEORY OF OEPRATION 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 M32150-25 mobile radio is comprised of two (2) circuit boards, the digital board and the RF board.
SECTION 1: THEORY OF OPERATION 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. The RF circuit board contains the following sections: Injection Synthesizer Provides programmable, ultra stable signals for the radio.
SECTION 1: THEORY OF OPERATION M32150-25 Mobile Radio Section Descriptions The M32150-25 Mobile Radio works in a frequency 150-159 MHz and requires a 1/4-wavelength antenna. This section provides detailed descriptions of each of the sections within the M32150-25 Mobile Radio. Refer to Appendix A to view the M32150-25 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 filter (FLT7) that selectively provides a high degree of out-of-band signal rejection. A low-noise amplifier (U3) amplifies the selected signals and is followed by an image and noise reject filter (FLT8). The output from FLT8 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 RV5 are used to adjust maximum deviation. Injection Synthesizer Two dual fractional synthesizer chips (U5 and U6) are the major contributor of the receiver and transmitter injection oscillators. This device contains the key components of a phase locked loop (PLL), including a prescaler, programmable divider, and phase detector.
SECTION 2: FACTORY TEST PROCEDURE Equipment List The following table lists the equipment required to perform the M32150-25 Mobile Radio Factory Test Procedure: QTY 2 1 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 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 M32150-25 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 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 RXINJ1, adjust potentiometer R81 for minimum frequency error of +/- 100Hz. Record this value on the Test Data Sheet. Step 2 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 While monitoring the voltage at RSSI2 Test Point with a DMM, adjust trimmer capacitor CV4 to midway between the points where the oscillation stops.
SECTION 2: 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,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.
SECTION 2: FACTORY TEST PROCEDURE Final Test A final test must be performed prior to shipping the M32150-25 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 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 Test Data File. Step 13 Perform a close visual inspection of the radio closely inspecting manufacturing related problems (loose screws, solder particles, etc.).
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, 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, 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: FCC LABEL M32150-25 Mobile Radio FCC Label Placement M32150-25 Mobile Radio FCC Label 401987 Page 21
APPENDIX A: CIRCUIT BOARD DIAGRAMS M32150-25 Mobile Radio Digital Circuit Board + + + + + + + M32150-25 Mobile Radio RF Circuit Board + + + + + + + + + + + + + + + + + 401987 Page 22
APPENDIX B: 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: 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: 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 mess
APPENDIX B: 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 error