IPSeries M32450-25 Mobile Radio Product Owner’s Manual Date Released: August 6, 2004 Document #: 516-80519-POM Revision: B Copyright 2004 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 M32450-25 Mobile Radio Section Descriptions ......................................................... 5 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 M32450-25 mobile radio is comprised of two (2) circuit boards, the digital board and the RF board.
SECTION 1: THEORY OF OPERATION robust data communications, and third generation collision detection and correction capabilities. Power Supply The power supply creates the various voltages required by the digital portion of the mobile radio.
SECTION 1: THEORY OF OPERATION M32450-25 Mobile Radio Section Descriptions The M32450-25 Mobile Radio works within a frequency range of 450 to 512 MHz and requires a 1/4wavelength antenna. This section provides detailed descriptions of each of the sections within the M32450-25 Mobile Radio. Refer to Appendix A to view the M32450-25 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 IF The major contributor of the IF subsystem (U20) 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 the low-voltage high performance monolithic FM IF system.
SECTION 1: THEORY OF OPERATION Transmitter/TR Switch The transmitter section consists of an amplifier (U3) and an op amp (U4). To transmit, 5-volt power is applied to the KEYPWR line. PA12V line is also powered up. This causes power amplifier (U2) to boost the RF power to the desired level. Up to 40 watts are available from the transmitter. Harmonic suppression is provided by C13, L2, and L3. Power and Analog Ground These sections consist of the power supplies and transmit control circuitry.
SECTION 2: FACTORY TEST PROCEDURE Equipment List The following table lists the equipment required to perform the M32450-25 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 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 M32450-25 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 RV1 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 Step 4 While monitoring the amplitude of the recovered audio signal, adjust potentiometer RV5 for a reading of 2.500 (+/-10 mV) VDC. Step 5 Steps 3 and 4 are interactive adjustments, therefore repeat steps 3 and 4 until further adjustment is no longer required (i.e. when 350 mV RMS and 2.500 VDC are realized). Step 6 While monitoring the recovered audio signal at TP1, verify the distortion is less than 3%, adjust CV3 if necessary to achieve less than 3% distortion.
SECTION 2: FACTORY TEST PROCEDURE Step 3 Using IPMessage send the txpower= command to increase the power level settings until 40 Watts of output power is obtained. Record this value on the Test Data Sheet. Note that values on the table are to plot the codes vs. power output. The 40-Watt setting can be a code not on the table. Adjust txpower until the code is found that does not exceed 40.0 Watts. Record this value on the Test Data Sheet.
SECTION 2: FACTORY TEST PROCEDURE closely monitor the variation in transmit frequency due to these different messages and ensure that on average the transit frequency error has been minimized to within +/-100 Hz. This indicates that some of these test messages will be slightly high in frequency, some messages will be slightly low in frequency, and some messages will be right on frequency. Step 4 Verify the transmit deviation is 4.
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 M32450-25 Data Transceiver FCC Label Placement M32450-25 Data Transceiver FCC Label M32450-25-FCCRpt.
APPENDIX A: CIRCUIT BOARD DIAGRAMS M32450-25 Mobile Radio Digital Circuit Board + + + + + + + M32450-25 Mobile Radio RF Circuit Board + + + + + + + + + + + + + M32450-25-FCCRpt.
APPENDIX B: M32450-25 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) U17 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: M32450-25 TEST DATA SHEET Transmit Section Parameter Spec Transmit Modulation Deviation (4.9 kHz while transmitting 1400 character test message) 4.9 kHz Transmit Data Quality (While transmitting 1400 character test messages to the base station) 240 > Transmit Frequency Error (Transmitting 1400 character test message) Measured +/- 100Hz Transmit Power Control Caution: Do not to exceed 40-Watts RF output power during this test.
APPENDIX B: M32450-25 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
APPENDIX B: M32450-25 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,