IPSeries IP8B Base Station Product Owner’s Manual Version Date: April 10, 2006 Document #: 516.80510.POM Version: B 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 .................................................................................................... 3 General Block Diagram.................................................................................................................. 3 General Block Diagram Definitions ..................................................................................... 3 Input/Output ......................................................................................
SECTION 1: THEORY OF OPERATION GENERAL BLOCK DIAGRAM General Block Diagram Definitions For increased data security, the modem supports the U.S. Government developed Digital Encryption Standard (DES) data encryption and decryption protocols. This capability requires installation of thirdparty IP compliant DES encryption and decryption software. The standard IPSeries base station circuit board contains five (5) main sections defined below: Input/Output System Controller 663195.
SECTION 1: THEORY OF OPERATION Modems Convert data into an analog audio waveform for transmission and analog audio from the receiver to serial data interface. There is one (1) modem that is dedicated to the transmit operation and two (2) modems dedicated to the receive operation. The modem dedicated to the transmit supports a 115.2 KBPS data transmission rate on the serial port, SLIP protocol, and 19.2 KBPS to 32 KPBS over-the-air data transmission rate.
SECTION 1: THEORY OF OPERATION IP8B Base Station Section Descriptions System Controller (refer to schematic on page 26) This section displays the Central Processing Unit (CPU)(U1), clock, and power-on reset circuitry. It provides more processing power than required for future capabilities to be incorporated without changing processors. Such capabilities include data encryption/decryption (DES) and remote fault monitoring.
SECTION 1: THEORY OF OPERATION Modem (refer to schematic on page 29) This base station uses separate modems for receive and transmit functions so that full-duplex operation may be obtained. The A0-A1 address bus in addition to the individual read (RD*), write (WR*), and chip select (MODEMTXCS*) lines control all three (3) modems. Modem operations are timed by Y2, a 4.9152 MHz clock module. Modem chip U14 is dedicated to the transmit operation.
SECTION 1: THEORY OF OPERATION Baseband (refer to schematic on page 34) This circuitry amplifies the audio from each receiver, routes it through a RF multiplexer, and selects the audio from the receiver with the highest RSSI value. The comparator circuit on the previous sheet controls it. There are three (3) channels of audio, with separate gain and DC offset adjustments to compensate for performance differences in the receivers. For example, incoming audio from receiver 1 appears at AUDIO 1.
SECTION 1: THEORY OF OPERATION Receiver Injection (refer to schematic on page 20 & 21) This displays a serial data input/output interface, synthesizer, and VCO. The I/O interface circuitry accepts clock, serial data, and enable signals from the System Controller Board via terminal block TB1. A lock detect (LD) status output is returned to the System Controller Board from the synthesizer. U6 is a hex Schmidt Trigger inverter, which squares up incoming signals for reliable operation of the synthesizer chip.
SECTION 1: THEORY OF OPERATION Analog Modulation (refer to schematic on page 52) This section displays the analog modulation circuitry. Incoming modem audio from the System Controller Board appears at TXMOD, and is buffered by op amp U3A. If an external modulation source (modem or amplified microphone) is connected to the base station’s DB9 connector, audio appears at EXTMOD. From there the audio passes through low pass Bessel filter U2. The audio is inverted and amplified by an op amp (U3B).
SECTION 1: THEORY OF OPERATION Power Amplifier (refer to schematic on page 40) The transmit injection signal from the RF injection section is applied to the high-powered linear amplifier (U1) one (1) watt amplifier. The signal is then routed to the final power amplifier boosting the output signal to 40 watts. 663195.
SECTION 2: FACTORY TEST PROCEDURE Equipment List The following table lists the equipment required to perform the IP8B Base Station Factory Test Procedure. CHECKLIST OF REQUIRED MATERIAL FOR PRELIMINARY TESTING OF THE IPSeries BASE STATION NO.
SECTION 2: FACTORY TEST PROCEDURE Programming and Configuring the Base Station This section applies to the 851-869 frequency range of the IPSeries Base Station. Important! The base station’s IP address must be known prior to performing the procedures in this section. The programming procedure should be performed when it is necessary to upgrade a base station’s Firmware or to change the operating parameters to suit client needs.
SECTION 2: FACTORY TEST PROCEDURE Adjustment / Alignment Procedures Make appropriate notations of any items that require attention during this procedure. This information is needed later during the repair process. Startup Step 1 Remove the base station cover placing the screws in a location where they will not be misplaced. Step 2 Connect the base station to the appropriate components. Step 3 Power up the base station and computer. The power supply ammeter must read 1.2 amps or less with a 13.
SECTION 2: FACTORY TEST PROCEDURE Diversity Reception Step 1 Inject an on-frequency signal at a level equal to Receiver 1 12dB SINAD level, modulated with a 1 KHz test tone at ±5.0 KHz deviation into Receiver 1. Step 2 While monitoring TP1 with the digital multi-meter, adjust RSSI1 low adjust potentiometer (R12) for a reading of 0.750 VDC ±10 mV. Step 3 Increase the amplitude of the signal by 50 dBm.
SECTION 2: FACTORY TEST PROCEDURE Step 13 Inject on-frequency signal at a level of –80 dBm, modulated with a 1 KHz test tone at ±5.0 KHz deviation into Receiver 1. Step 14 While monitoring the AC voltage at TP6 adjust audio 1 AC adjustment potentiometer (R72) for 350 mVRMS (±1 mV). Step 15 While monitoring the DC voltage at TP6 adjust audio 1 DC adjustment potentiometer (R57) for 2.500 VDC (±1 mV).
SECTION 2: FACTORY TEST PROCEDURE Exciter Step 1 Using the X=1400,19 command, generate data messages so the transmit power and frequency can be checked. Step 2 Note the power level and then on the power amplifier circuit board adjust the potentiometer (R3) fully counterclockwise (this will enable low power transmit operation). Step 3 Connect the base stations’ transmit port to the HP communication test set.
SECTION 3: FCC LABEL IP8B Base Station FCC Label Placement LABEL IP8B Base Station FCC Label 663195.
APPENDIX A: CIRCUIT BOARD DIAGRAMS System Controller J2 32 Y1 C76 25 26 C84 1 U13 R80 100 C74 J3 R79 16 U2 R50 R62 R65 50 109 51 C56 108 T1 R66 C83 76 C75 R51 75 C77 S3 C8 REWORK INSTRUCTION ADD JUMPER (30 AWG INSULATED WIRE) from U19 Pin2 to VIA (RVCC) U10 S2 J1 C7 R33 C28 U14 R31 U8 TP5 73 72 U19 U18 C58 R88 C59 R83 R82 R81 U20 + U17 D7 U7 C90 8 U21 S1 U15 U4 U6 TP8 7 J5 C88 R43 1 R44 R41 R42 R39 12 R40 J8 C89 1 J7 VR3 9 1 10 2 TP4 Y2 F1 U16
APPENDIX A: CIRCUIT BOARD DIAGRAMS Receiver – Bottom Receiver Injection ADD 1000pF ACCROSS THESE PADS (SIZE 0805) INSTALL C22 AS SHOWN 663195.
APPENDIX A: CIRCUIT BOARD DIAGRAMS Exciter – Top U5 C36 C44 C27 R30 + C37 C46 R35 R34 + + + + + + + C50 POLARITY Exciter – Bottom C3 R6 R13 C35 R3 C7 R9 C5 U1 R12 + U2 C6 R5 + C2 C1 R8 R17 R7 C4 C29 U3 + 663195.
APPENDIX A: CIRCUIT BOARD DIAGRAMS Power Amplifier U3 FOR REF ONLY C14 C11 C14 TO BE MOUNTED ON TOP OF C11 663195.
APPENDIX B: IP8B TEST DATA SHEET Program and Configure the Base Station Date Serial Number Firmware Revision End User Tester Adjustment / Alignment Procedures Receiver Injection Parameter Spec Injection Frequency Error at RXINJ1(within +/- 10 Hz of exact injection frequency) P1 & C39 Measured +/- 100 Hz 5 +/- 1 dBm Receiver Diversity Reception Controller 1, 2 & 3 Parameter Spec U2 Pin 4 +10 to +5 dBm RSSI Test Point TB1-4 2.8 to 3.0 VDC Distortion (1 kHz Test Tone @ 5.
APPENDIX B: IP8B TEST DATA SHEET Data Quality Parameter Spec Receiver 1 Data Quality (x=1400, 19 Command IPMessage Utility) 240> Receiver 2 Data Quality (x=1400, 19 Command IPMessage Utility) 240> Receiver 3 Data Quality (x=1400, 19 Command IPMessage Utility) 240> Measured Exciter Parameter Spec Transmit Frequency Error (Transmitting 1400 character test message) Transmit Modulation Deviation (5.