PDR 3500 Transportable Repeater Basic Service Manual 1
Table of Contents 1 - Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7 - Setup and Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1 Programming with RSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
After Installing the New Wireline Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ASTRO Modem Card/V.24 Interface Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Physical Replacement of the Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . After Installing the New Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
List of Tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Table 11. Table 12. Model Structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . .
Foreword 1 General The information contained in this manual supplement relates to all PDR 3500s, unless otherwise specified. This manual provides sufficient information to enable service shop personnel to troubleshoot and repair a PDR 3500 to the module level. Safety Information Before operating a PDR 3500, please read the “Safety Information” section in the front of this manual. Manual Revisions Changes which occur after this manual is printed are described in “FMRs.
Crystal and channel element orders should specify the crystal or channel element type number, crystal and carrier frequency, and the model number in which the part is used. Parts Ordering 7:00 A. M. to 7:00 P. M. (Central Standard Time) Monday through Friday (Chicago, U. S. A.) Domestic (U. S. A.): 1-800-422-4210, or 847-538-8023 1-800-826-1913, or 410-712-6200 (Federal Government) TELEX: 280127 FAX: 1-847-538-8198 FAX: 1-410-712-4991 (Federal Government) Domestic (U. S. A.
Safety and General Information 2 Important Information IMPORTANT INFORMATION ON SAFE AND EFFICIENT OPERATION. READ THIS INFORMATION BEFORE USING YOUR TRANSPORTABLE REPEATER. RF Operational Characteristics Your transportable Repeater contains a transmitter and a receiver. When it is ON, it receives and transmits radio frequency (RF) energy.
Electromagnetic Interference/ Compatibility NOTE: Nearly every electronic device is susceptible to electromagnetic interference (EMI) if inadequately shielded, designed or otherwise configured for electromagnetic compatibility. • FACILITIES To avoid electromagnetic interference and/or compatibility conflicts, turn off your radio in any facility where posted notices instruct you to do so. Hospitals or health care facilities may be using equipment that is sensitive to external RF energy.
Introduction 3 General The Motorola PDR 3500 provides conventional analog, ASTRO™, ASTRO CAI™, and SECURENET™ capabilities in a compact, software-controlled design. The station architecture and microprocessor-controlled Station Control Module allow for fast and reliable upgrading. FLASH memory in the Station Control Module allows software updates to be performed locally (using serial port), or remotely via modem.
Wireline Circuitry The station wireline circuitry provides a wide variety of telephone interfaces, including analog, ASTRO, ASTRO CAI, SECURENET, Tone Remote Control, and DC Remote Control. Telephone line connections are easily made to the wireline circuitry via connectors on the top panel. Switching Power Supply The station features a switching-type power supply, accepting a wide range of AC inputs (85-265 VAC, 49-61 Hz). The power supply generates 13.8 VDC for the station modules.
System Applications Local Control 4 The PDR 3500 is an APCO 25 digital repeater. The station is identical in operation to the Quantar station, hence there is no local control capability. There is no digital-to-audio translation within the station. Local control style operation can be accomplished in several ways: a. A portable radio may be used as an RF control station talking to the repeater. b.
Notes 4-2 68P81093C75-A
5 Models and Specifications Model Chart Table 1.
Table 2. Options OPTION DESIGNATOR DESCRIPTION PURPOSE Q245 Add: Duplexer Adds VHF or UHF duplexer. Requires customer frequency. Q463 Add: Antenna Relay Adds VHF/UHF antenna relay for base station operation. Q502 Add: Wireline Adds wireline remote control option. Q504 Add: ASTRO 9.6 Kbps Modem Adds 9.6 Kbps modem card. H338AC Add: Transit Case Adds a transit case for increased protection during transport.
Table 4. Specifications, continued DUPLEXER Repeat frequency spread, TX/TX: 300 kHz VHF minimum duplexer T-R separation 132-174 MHz: 3 MHz UHF minimum duplexer T-R separation 403-512 MHz: 3 MHz 800 MHz duplexer T-R separation: 45 MHz POWER SOURCE AC power voltage range: 80-265 Vac AC power frequency input: 49-61 Hz External DC power: 11-16 Vdc CURRENT DRAIN High power repeat: 10.0 A Standby: 2.0 A DIMENSIONS Size (English): 20.00 x 15 x 7.
Notes 5-4 68P81093C75-A
Approved Accessories 6 General The following accessories are recommended by Motorola for use with the PDR 3500. Antenna One of the following antennas should be used: • The magnetic-mount whip antenna (Motorola part number PAN6003A) shipped with the PDR 3500. NOTE: This antenna should be cut to frequency before use per the manufacturer’s instructions enclosed with the antenna.
Notes 6-2 68P81093C75-A
7 Setup and Connections Programming with RSS Introduction The PDR 3500 uses the same RSS (Radio Service Software) as the Quantar/Quantro family. Some values shown in RSS screens may not be valid due to hardware differences between the Quantar Station and the PDR 3500. A thorough explanation of the differences will be given in the following sections.
Connect one end of the cable to COM1 on the PC and the other end to the 9-pin connector labeled “RSS” on the top panel of the PDR 3500. Using the RSS For information on starting the RSS, configuring screen colors, setting up the PC serial port, and general RSS use, refer to the Quantar RSS User’s Guide (68P81085E35).
3. Next verify that the Rx Freq Band 1 and Tx Freq Band fields list the correct ranges for receiver and transmitter. NOTE: Rx Freq Band 2 should be set to “NONE.” 4. The PA Power Rating field should be set based on Table 5. All PDR 3500 transmitter ranges except UHF R3 and R4 use the Quantar low-power station profile. However, there is no lowpower UHF R3 or R4 Quantar, so the high-power profiles are used for those ranges. Table 5.
Channel Information From the Main Menu, press F4. Press F4 again to arrive at the Channel Information Screen. From this screen, the user may configure the TX and RX frequencies, RF power out, modulation type, and the various channel traits for up to 16 channels. 1. In this screen, first set the Rx1 and Tx frequencies to the proper values. NOTE: The Rx2 frequency is set to 0.00000 MHz and cannot be edited. This is because the PDR 3500 does not support 2 receivers.
Table 6. UHF R3/R4 Output Power Translation Table Station lower limit UHF R4 alignment power UHF R4 upper limit UHF R3 alignment power UHF R3 upper limit 68P81093C75-A Actual Power (W) RSS Power UHF R3 (W) RSS Power UHF R4 (W) 5 20 20 6 24 24.5 7 28 29 8 32 33.5 9 36 38 10 40 42.5 11 44 47 12 48 51.5 13 52 56 14 56 60.5 15 60 65 16 64 69.5 17 68 74 18 72 78.5 19 76 83 20 80 87.5 21 84 92 22 88 96.5 22.8 100 23 92 101 24 96 105.
4. The Battery Backup field specifies the output power of the station when a low DC supply voltage is detected by the station. This field is intended primarily for use in DC-powered applications such as running off a car battery. The Battery Backup setting should be 10 watts or less and should typically be lower than the Normal setting.
to a received signal. To deactivate the Access Disable function, press shift+F6. 2. RSSI Calibrate: 1. In the Alignment Menu Screen, tab over to the RSSI Calibrate field, and press F2 to perform the alignment. 2. Using an R2670 or equivalent Communications System Analyzer, connect the RF out from the Analyzer to the Rx UHF-type connector on the station top panel. 3. Set the RF output level from the Analyzer to –90 dBm with no modulation, and set the frequency to PDR 3500 receive frequency. 4.
R-2670 Communications Analyzer, or to the input of an RF power meter. The duplexer is bypassed for this alignment. 3. Press F6 to keyup the station. 4. Check the output power level shown on the R2670 or RF power meter. 5. Press F9 to dekey the station. 6. Enter the power from the meter in the field shown in RSS, or for a UHF R3 or UHF R4 station, enter the translated RSS Power from Table 6. See the Channel Information heading and Table 6 for more information on power translation. 7.
3. Once the squelch is set, press F8 to save the setting to the station codeplug. 5. ASTRO Bit Error Report: 1. From the Alignment Menu, tab over to the V.52 Rx BER and RSSI Report, or PROJECT 25 Rx BER and RSSI Report. 2. Connect the R2670 Communications System Analyzer RF “OUT” port to the Rx UHF-type connector on the station top panel. 3. Set the generate frequency to the PDR 3500 receive frequency, and the output level to –113 dBm, with modulation either V.52 or Project 25 1011 Pattern generation. 4.
RF Cabling Connections Introduction The transmit and receive antenna RF connections may be made in one of two fashions depending on the system application. • Separate TX and RX antennas. The PDR 3500 top panel has two UHF-type connectors: one for RX, and one for TX. In this configuration there is a separate antenna for each connector. • Duplexer Using this configuration, only one antenna is required for both transmit and receive.
8 Operation Description This section describes the switches, pushbuttons, connectors, and LED indicators on the PDR 3500 used during local operation and servicing of the station. Summary of Switches, Pushbuttons, and Connectors The following switches, pushbuttons, and connectors allow the station to be operated or serviced locally. See Figure 2 for the location and function of these controls and connectors. Table 8.
Duplexer Antenna Relay Connector (3-pin) Wireline Connections (RJ-45) A B C D E Antenna F Receive UHF Jack Transmit UHF Jack MAEPF-27065-O Figure 2. Switches, Pushbuttons, Connectors, and LED Indicators for PDR 3500 Table 10. Switches, Pushbuttons, and LED Indicators Item 8-2 Name Purpose A EIA-232 RSS Port Connector Used to connect an IBM® PC (or compatible PC), running RSS software. Performs station alignment, optimization, and diagnostics.
Troubleshooting 9 Introduction This section provides troubleshooting recommendations and procedures for the PDR 3500 and associated ancillary equipment. Troubleshooting Overview The troubleshooting procedures and supporting diagrams allow the service technician to isolate station faults to the module/assembly level, or to a limited portion of the motherboard circuitry.
Many of the troubleshooting procedures require the use of the Motorola-supplied Radio Service Software (RSS) since the PDR 3500 is computer-controlled, employing state-of-the-art signal processing. The RSS operates on a PC (or compatible), with RS-232 communication port capability. The RSS allows the technician to access alarm logs, run diagnostics, and set up the equipment for various audio and RF tests.
ROUTINE MAINTENANCE VISIT PROCEDURE 1 OBSERVE LED INDICATORS and MONITOR ALARM TONES (PAGES 6 AND 9) • OBSERVE LED INDICATORS ON STATION MODULE FRONT PANELS • MONITOR ALARM ALERT TONES FROM EXTERNAL SPEAKER MODULE SUSPECTED OF BEING FAULTY? YES GO TO TROUBLESHOOTING PROCEDURE 2 FLOW CHART NO INTERPRET STATUS REPORT (RSS USER’S GUIDE–68P81085E35) • USING RSS, ACCESS THE STATUS REPORT SCREEN AND LOOK AT HISTORY OF ALARMS AND TIME STAMPS MODULE SUSPECTED OF BEING FAULTY? YES GO TO TROUBLESHOOTING PROC
PROBLEM REPORTED OR SUSPECTED PROCEDURE 2 OBSERVE LED INDICATORS and MONITOR ALARM TONES (PAGES 6 AND 9) • OBSERVE LED INDICATORS ON STATION MODULE FRONT PANELS • MONITOR ALARM ALERT TONES FROM EXTERNAL SPEAKER LED PATTERN INDICATES STATION IN SOFTWARE DOWNLOAD MODE? YES USING RSS, ACCESS THE STATUS REPORT SCREEN. ANALYZE MESSAGES TO DETERMINE IF MODULE FAILURE HAS OCCURRED.
A PROCEDURE 2 (CONTINUED) CHECK CODE PLUG PROGRAMMING (RSS USER’S GUIDE – 68P81085E35) • USING RSS, READ THE STATION CODE PLUG AND VERIFY THAT PROGRAMMING IS CORRECT (COMPARE TO CODE PLUG FILE ON PC FOR PARTICULAR STATION) • RE-PROGRAM STATION CODE PLUG BY DOWNLOADING CODE CUSTOMER DATA FROM CODE PLUG FILE FOR PLUG NO PARTICULAR STATION (RSS GUIDE – 68P81085E35) PROGRAMMING CORRECT? • IF PROBLEM STILL EXISTS, PROCEED TO INTERPRET STATUS REPORT YES INTERPRET STATUS REPORT (RSS USER’S GUIDE–68P81085E35) •
Interpreting LED Indicators Several LED indicators are provided on the front panels and on the top panel of the chassis. These LEDs give a quick status indication of the station equipment. The Station Control Module LEDs are visible from the station’s top panel. Observing the other LEDs requires the removal of the station’s chassis from the case. See Figure 3 for the location of all LED indicators on the station’s equipment.
Table 11.
STATION CONTROL MODULE (Front Panel - Cover Plate Removed) Handset Speaker RSS Port Intercom/Shift CSQ/PL/Off Vol Down/ Access Disable Vol Up/Local PTT Station On Station Fail Intrem/AccD Control Ch Rx 1 Active Rx 2 Active Rx Fail Aux LED TOP PANEL OF STATION PWR/Tx PTT/Reset Switch WL On WL Fail WIRELINE INTERFACE MODULE (Front Panel) Tx Lock PA Full PA Low PA Fail EXCITER MODULE (Front Panel) MAEPF-27030-O Figure 5.
Interpreting Alarm Alert Tones Introduction Four station alarm conditions are reported with audio alert tones which are routed to the external speaker connector (RJ-11) on the front of the control module. (Pin 4 on the RJ-11 is Speaker High; Pin 1 is Speaker Ground.) The alarms are also entered into the alarm log which can be accessed using the RSS. Refer to the RSS User’s Guide, part number 68P81085E35.
Verifying Transmitter Circuitry Introduction While most module faults can be detected by running the station diagnostics provided by the RSS, the following procedure provides a more traditional method of troubleshooting the transmitter circuitry. This procedure is useful in the event that the RSS is not at hand or for some reason cannot be utilized (PC malfunction, etc.
2 To Antenna In-line Wattmeter Duplexer or Antenna Relay Antenna Port 1 If duplexer or antenna relay is used, connect N-to-N cable from antenna port to in-line wattmeter, otherwise connect UHF-to-N cable from top panel transmit jack to in-line wattmeter. Connect wattmeter to dummy load. Disconnect cable from antenna port of duplexer or antenna relaly. If duplexer or relay not used, disconnect cable from top panel transmit output port.
Step 3. Press the PTT button and observe the LED indicators on the Exciter Module front panel. • If PA Low or PA Fail LED is lit, suspect the following: - Power Amplifier Module failure - Intermediate Power Amplifier Module failure (800 MHz stations only) - Exciter Module failure - Loose or bad Exciter-to-PA RF cable - DIP switches on backplane are set for incorrect station frequency band. DIP switches should be set as described in the backplane portion of the Module Replacement section.
If the station still does not generate rated power, suspect the following: - Power Amplifier Module failure - Intermediate Power Amplifier Module failure (800 MHz stations only) - Exciter Module failure - Loose or faulty Exciter-to-PA RF cable - Faulty forward voltage or control voltage translation circuitry on backplane Step 5. If the PA power out is okay, setup R2001 for spectrum analyzer display. Press the PTT button and observe the display.
• If the proper display is not obtained, suspect faulty SCM or Exciter Module Step 8. This completes the Verifying Transmitter Circuitry test procedure. If all displays and measurements are correct, the transmitter circuitry may be considered to be operating properly. • Remove test equipment. • Restore the station to normal service. • Return to the trouble shooting flow chart to resume the troubleshooting sequence.
IMPORTANT! Verifying Receiver Circuitry Procedure If the station operates as a repeater, the transmit output from the station must be connected to a dummy load to prevent over-the-air broadcast during receiver testing. Step 1. Connect test equipment by performing Step 1 through 3 shown in Figure 5. NOTE: The cover plate over the SCM side of the chassis must be removed to perform these tests. Step 2.
1 Disconnect cables from top panel transmit and receive ports. PDR 3500 Top Panel Dummy Load To Antenna 2 Connect UHF-to-N cable from station top panel receive port to R2001 RF in/out. Connect UHF-to-N cable from top panel transmit port to dummy load.
Step 5. Use the Volume Up button to increase the volume to maximum. Measure the audio level using the R2001. • Audio level should measure approximately 0.75 to 1.5 V p-p. If not, suspect faulty SCM. Step 6. Change R2001 injection signal to • VHF: 0.25 µV (-119 dBm) • UHF: 0.35 µV (-116 dBm) • 800 MHz: 0.30 µV (-117.5 dBm). Step 7. Measure the receiver 12 dB SINAD sensitivity. The value should read 12 dB, or greater. If not, tune the preselector (VHF and UHF only) and re-check 12 dB SINAD.
COMMUNICATIONS SYSTEM ANALYZER 0 7 8 9 4 5 6 1 2 3 PDR 3500 Top Panel MONITOR OSCILLOSCOPE RF SECTION Duplexer RF Output RX Motorola R2001 Communications Analyzer TX Capacitive Coupler (Isolated T) Dummy Load MAEPF-27035-O COMMUNICATIONS SYSTEM ANALYZER 0 7 8 9 4 5 6 1 2 3 PDR 3500 Top Panel MONITOR OSCILLOSCOPE RF SECTION Duplexer RF Output RX Motorola R2001 Communications Analyzer TX Capacitive Coupler (Isolated T) Dummy Load MAEPF-27036-O Figure 8.
Station Control Module 2 1 Press and hold Shift Button. Press Vol Down/ Access Disable 3 Intcm/Acc D LED should Flash yellow. Exciter Module 4 PA Full LED should NOT illuminate. MAEPF-27037-O Figure 9. Disabling the Transmitter Step 11. Measure the 12dB SINAD sensitivity and make a note of the level. This level will serve as a baseline for the receiver sensitivity. If 12 dB SINAD cannot be achieved, suspect the following: • Test configuration used does not match that shown in Figure 6B.
• Station receive frequency does not match the duplexer receive frequency. Use a different frequency or replace the duplexer. (Field tuning of duplexers is not recommended.) Step 14. Steps 14 and 15 will test the effect of duplexer quieting on receive sensitivity. Re-enable the transmitter by holding down the Shift button again and pressing the Access Disable button on the SCM.
• Power Supply Module • 2.1 MHz Reference Oscillator Circuitry • Receiver-related circuitry in the Station Control Module (SCM) The transmitter circuitry is exercised by injecting and measuring signals using a Motorola R2670 Communications Analyzer (or equivalent), and analyzing the Bit Error Rate using the RSS. Measured values outside the acceptable range indicate a faulty module; values within range verify proper operation of the above modules and circuitry.
• UHF: 0.35 µV (-116 dBm) • 800 MHz: 0.30 µV (-117.5 dBm) If you are injecting RF through a duplexer, change the R2670 injection signal level to: • VHF: 0.29 µV (-117.7 dBm) • UHF: 0.43 µV (-114.4 dBm) • 800 MHz: 0.35 µV (-116 dBm) Step 4. Note the receiver BER reading. The BER reading should be 5% or less. If not, and if a duplexer is being used, repeat the BER test, bypassing the duplexer.
DC Power Supply AC Jack B D C LED Switch Rx Motherboard J20 Terminal Tabs F P10 F P9 P5 G A E RSS H I Tx Fan Fan J Receiver Exciter VHF, UHF K L 800 MHz M IPA PA MAEPF-27080-O Figure 10.
AC Inlet (Viewed from Underside) Power Supply Output Input Neg Pos H N Gnd BROWN ORANGE Nuts Lock Washers GRN/YEL Ring Lugs GRN/YEL Chassis Ground Stud MAEPF-27099-O Figure 11. Chassis Ground Wiring Diagram Module Locations Refer to Figure 12 for the locations of modules within the station chassis.
Module Replacement Procedures Station modules suspected of being faulty must be replaced with modules known to be in good condition in order to restore the station to proper operation. The following procedures provide instructions for replacing each of the station modules and performing any required post-replacement adjustments or programming. General Replacement Information ! WARNING: When wearing a Conductive Wrist Strap, be careful near sources of high voltage.
If the cleaning of gold-plated contacts is required, use a soft cloth dampened with alcohol to lightly wipe the contacts. Be sure not to touch the contact surfaces with your fingers; finger oils and salts can contaminate the contact surfaces. Power Down Station Before Removing/ Inserting Modules Before removing or inserting a module into the station chassis and engaging the backplane connector, be sure to turn off the station power by unplugging the AC or DC power cord, or both.
3. Remove the cover plate on the left end of the front of the station by removing the two screws from the front of the plate, then removing the four Phillips screws from the side and bottom edges of the plate. 4. Pull out the old Control Module by gripping behind its DB-9, RJ-11, and RJ-45 connectors, distributing pressure equally among the connectors. 5. Insert the new module. Make sure it is in the cardguides; push it firmly into the chassis until it seats into the card-edge connectors on the backplane.
For ASTRO stations only: • Simulcast/ASTRO Launch Time Offset For 6809 Trunking stations only: • TDATA Wireline Physical Replacement of the Wireline Module 1. Turn off the station’s power by unplugging the AC and DC power cords from the top panel. 2. Remove the eight Phillips screws from the edges of the station’s top panel and lift the chassis out of the case. 3.
ASTRO Modem Card/ V.24 Interface Card Physical Replacement of the Card 1. Remove the Wireline Module as described above. 2. Unplug the faulty ASTRO Modem Card or the V.24 Interface Card from the Wireline board by pressing the mounting posts through the back of the board. Install the replacement card by pressing it onto the Wireline board and locking all mounting posts and connectors. 3. Re-install the Wireline Module as described above.
8. Reinsert the receiver mounting plate and reattach the receiver coaxial cable by reversing Steps 4 and 5. 9. If desired, power up the station while it is still out of the case to make sure the module is securely in place. If any of the LEDs do not light, are dim, or flash rapidly, one or more of the modules are not seated properly. 10. For VHF and UHF stations, tune the preselector using the procedure in the Maintenance subsection, Preselector Field Tuning Procedure.
4. Tilt the chassis up on its back edge; then, from the bottom of the chassis, remove the six Phillips screws holding the Exciter’s mounting plate. Slide the mounting plate out of the front of the chassis. 5. Pull out the old Exciter Module by gripping behind the miniUHF connector and pulling gently. 6. Insert the new module. Make sure it is flat on the bottom of the chassis. Push it firmly into the chassis until it seats into the cardedge connectors on the backplane.
5. Slide the Exciter mounting plate out of the chassis with the IPA module still attached. 6. Remove four Phillips screws from the corners of the IPA module, and lift the module off of the Exciter mounting plate. 7. Set the new IPA module in place on the plate, making sure the 3-pin header is towards the rear of the station. 8. Slide the Exciter mounting plate back into the chassis, reattaching the 3 cables removed in Step 4. 9.
Physical Replacement of the Power Amplifier 1. Turn off the station’s power by unplugging the AC and DC power cords from the top panel. 2. Remove the eight Phillips screws from the edges of the station’s top panel and lift the chassis out of the case. 3. Remove the backplane as described in the Backplane replacement subsection, but disengage only the PA ribbon cable connector (P10) and the red and black power leads (two tab connectors closest to the bottom edge of the backplane).
10. Reconnect the PA ribbon and power cables to the backplane, making sure the ribbon connector latches securely. Make sure all other cables are attached and reattach the backplane as described in the Backplane replacement subsection. 11. If desired, power up the station while it is still out of the case to verify the PA is connected properly. Unplug the station before continuing to the next step. 12. Place the chassis back in the case and secure it with the eight Phillips screws around the top panel.
Backplane Before Installing the New Backplane The PDR 3500 motherboard contains circuitry which translates between the Exciter from the original Quantar and the PA from the Spectra™ mobile radio. Since the translations depend upon the frequency band of the Exciter and the PA, this circuitry is also frequency-sensitive. For the proper translation path to be selected, the DIP switches located on the motherboard must be set based on the frequency band of the station.
7. Pull the Receiver and Exciter Modules away from the backplane until they disengage from the backplane card edge connectors (approximately 1/2"). NOTE: Be careful to not put any tension on the coaxial cables between the Exciter, PA, and IPA (for 800 MHz). If necessary, disconnect one or more of the cables as described in the Exciter Module replacement subsection. 8. On the back of the chassis, remove the six Phillips screws holding the backplane in place. Pull the backplane down and away from the chassis.
After Installing the New Backplane Perform the following alignment procedures as described in the Setup and Connections section of this manual: • Power Output Using the RSS, run a complete battery of diagnostics to exercise all boards and modules. Preselector Field Tuning Procedure The VHF and UHF Receiver Modules comprise a circuit board and a preselector assembly. Both are secured in a slide-in module housing.
VHF Tuning Procedure Calculating Proper Alignment Frequency Use one of the following two methods to calculate the alignment frequency to be generated by the signal generator. For stations with a single receive frequency, calculate the frequency of the alignment signal as follows: Step 1. From the site documentation or the RSS, determine the station receive frequency. Step 2. If the frequency is ≤ 148 MHz (Range 1) or ≤ 156 MHz (Range 2), subtract 250 kHz. Otherwise, note the actual frequency.
Step 2. Calculate a midpoint frequency as follows: Fmid = (Fhighest + Flowest) ÷ 2 Step 3. Using Fmid in place of the station receive frequency, perform Step 2 through Step 4 above. Preparing Equipment Step 1. Make sure the Receiver Module (with the Preselector Assembly) is installed in a functional PDR 3500. Step 2. Remove the chassis from its case by removing the eight Phillips screws from the edges of the station’s top panel. Step 3.
From Signal Generator RX TX Preselector Assembly Tension Nut To RX Connector on Top Panel Tuning Screw To Receiver Board To Dip/Peak Monitor (RF Millivoltmeter or Power Meter) Tuning Probe MAEPF-27038-O Figure 13. Test Equipment Setup for Preselector Field Tuning VHF Tuning Procedure Step 1. Provide power to the PDR 3500 through either DC or AC (to provide the active 50 Ω termination). Step 2. Adjust the signal generator to the frequency calculated on page 9-38. Set the level to +5 dBm. Step 3.
NOTE: The DIP will not be as sharp for screw 5 as it was for screws 2 through 4. Preselector Assembly TUNING SCREW 1 TUNING SCREW 2 TUNING SCREW 3 TUNING SCREW 4 H1 H2 To Station Receive Antenna Port To Receiver Board H3 H4 H5 TUNING SCREW 5 MAEPF-27039-O Figure 14. Location of Tuning Screws and Cavity Probe Holes UHF Tuning Procedure Calculating Proper Alignment Frequency Use one of the following two methods to calculate the alignment frequency to be generated by the signal generator.
Step 4. If the Receiver Module is Range 3, determine the alignment frequency as follows: If the frequency (from Step 1) is > 492 MHz, then the alignment frequency = 492 MHz. If the frequency (from Step 1) is < 472 MHz, then the alignment frequency = 472 MHz. Otherwise, use the actual frequency from Step 1. Step 5. If the Receiver Module is Range 4, determine the alignment frequency as follows: If the frequency (from Step 1) is > 510 MHz, then the alignment frequency = 510 MHz.
Step 4. Using the torque driver and deep-well socket, loosen the three tension nuts on the adjustment screws. Step 5. De-tune the preselector as follows: Turn tuning screws 3 and 4 clockwise until they bottom out. Be careful not to apply more than 3 in. – lb. of torque to prevent warping the preselector cover and housing. Step 6. Connect the test equipment as shown in Figure 15.
Step 5. Keep the tuning probe in cavity “U2” and adjust tuning screw 3 for a DIP. Step 6. Tighten tension nut on tuning screw 3 to at least 12 in. – lb. and fine tune tuning screw 3 for a DIP. Step 7. Insert the tuning probe into cavity “U3” and decrease the output from the signal generator to -5 dBm. Step 8. Adjust tuning screw 4 for a DIP. Step 9. Tighten tension nut on tuning screw 4 to at least 12 in. – lb. and fine tune tuning screw 4 for a DIP.
Functional Theory of Operation 10 The following functional theory of operation provides an overview of the station circuitry. For a more thorough functional description of a particular module, refer to the appropriate section of the Quantar User’s Guide (68P81095E05). Refer to the block diagram in Figure 17 for the following functional theory of operation.
Based on the comparison, a power control voltage is generated to control the output power from the PA. This feedback and control loop continually monitors the output power. It adjusts the control voltage to maintain the proper output power from the PA. Intermediate Power Amplifier Module Operation (800 MHz stations only) The 800 MHz PDR 3500 uses a custom, 50Ω input and output, variable-gain Intermediate Power Amplifier to boost the RF signal from the Exciter Module to the final Power Amplifier Module.
The filtered signal is then amplified and fed to the RF input of the 1st mixer. The 1st mixer combines the filtered signal with an injection signal generated by the Synthesizer/VCO. This results in a 21.45 MHz (VHF), or 73.35 MHz (UHF and 800 MHz) 1st IF (intermediate frequency) signal. VHF and UHF receivers use high-side injection; 800 MHz receivers use low-side injection. (The injection signal is determined by frequency programming data from the Station Control Module via the SPI bus.) The 21.45 or 73.
The DSP and DSP ASIC perform the necessary digital signal processing for the station audio and data signals. The DSP circuitry interfaces with the Receiver Module (receive audio), the Exciter Module (modulation signal), and the Wireline Interface Board (wireline audio). The 2.1 MHz Reference Oscillator generates the reference signal used by the Receiver and Exciter Modules.
Power Supply Module Operation The Power Supply Module is a switching-type power supply which accepts an AC input (85-265 VAC, 49-61 Hz) and generates the 13.8 Vdc for the station modules and the power regulation circuitry on the motherboard. The Power Supply Module is capable of 12 A continuous load and 18 A maximum load.
Notes 10-6 68P81093C75-A
Block Diagram, Schematics, Electrical Parts List, Circuit Board Detail, and Chassis Parts List 68P81093C75-A 11 11-1
11-2 68P81093C75-A
Receive Antenna WIRELINE INTERFACE BOARD Wireline Audio From Landline To Station RF Input/Output (Top Panel) Wireline Audio From Station To Landline 4 - Wire Audio Circuit RECEIVER MODULE Address 1st Mixer Preselector Filter 3-Pole (UHF) 5-Pole (VHF) 7-Pole (800/900) SPI Bus To/From Station Control Module 21.45 MHz (VHF) 73.
A+ LN+5 SPICLK LN+5 LN+5 8 S1 7 S1 SPIMOSI C85 1 SW1 R1 R63 22.1K 1% 3.01K SPIMISO LN+5 R42 R43 R74 R3 20K 20K 20K 5.62K 1% 13 R64 10K 1% 32.4K 14V MOD FAIL 0 0 0 0 1 0 UHF R3 1 0 1 1 UHF R4 0 1 1 0 800 MHZ FAN ALARM 22.1K 1% HS TEMP BAT TEMP 4 AC FAIL 4 5 6 7 8 9 AN0 AN1 SCLK AN2 DIN U8 AN3 DOUT AN4 CS* AN5 VREF AN6 VAG AN7 AN10 AN8 9.
These op-amps are part of the forward voltage translation. They subtract 0.6V from the forward voltage and serve as buffers. 11 PA Identification. U11 and U17 select the PA ID resistors read by the Exciter to determine the frequency band of the PA and the backplane DIP switch settings. Do-not-place resistors are included for possible future use and should not be placed in normal applications.
A+ 2 3 4 L14 and C8 function as a low-pass filter to block interference at the switching frequency of U6 (500kHz) from reaching A+ and getting out of the station on AC or DC power wires. The filter is necessary for the station to meet FCC guidelines for line conducted emissions. R86 and R87 allow the filter to be bypassed if necessary in future designs, but in normal use, R86 should not be placed, and R87 should be a 0Ω jumper.
LN+5 9.6V J2 43 HDLCCLK J8 53 J5 43 A0-CS1 J2 53 J8 52 J20 6 CTS1 J20 J7 31 VR10 J2 41 J8 69 VR12 4 J2 65 M21 RTS1 U9 SPARE#6 14 4 POWER U3 11 RX16.8MHZREF J2 52 HDLCDATA TXDATA- VR42 J5 65 C26 C27 0.1uF 470pF POWER U4 C28 C29 0.
Electrical Parts List: Backplane Circuit Board Reference C1 C2 thru C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 thru C19 C21 C22 C23 thru c24 C25 C26 C27 C28 C29 C30 C31 C32 C33 C34 C35 thru C37 C38 C39 C40 thru C41 C42 C43 C44 thru C45 C46 C47 C48 thru C51 C52 thru C54 C55 thru C59 C60 C61 thru C62 C63 C64 C65 thru C72 C73 C74 C75 C76 C77 C78 C79 C80 thru C81 C83 C84 C85 C86 thru C88 11-8 Motorola Part Number 2113741B69 2113740F67 2311049A19 2113740F67 2311049A19 2113740F67 2313748R01 2113740F67 2
68P81093C75-A 11-9
80 78 79 77 56 58 55 57 4 J7 80 78 79 77 2 3 1 56 58 55 57 4 2 J8 3 1 P8 1 1 3 2 77 79 78 80 1 3 2 J5 4 57 55 58 56 77 79 78 80 57 55 58 56 77 79 78 80 1 4 J6 57 55 58 56 3 1 3 2 4 J2 Figure 20.
R66 7 VR36 24 26 23 25 R17 R16 8 U5 P10 D1 L13 R33 R87 1 C5 R8 R7 C96 C97 U19 C48 U7 5 C3 R79 C98 8 U19 7 R40 R41 U20 C103 14 C102 9 C104 C101 C105 U3 R85 D2 8 C4 C100 C99 BLU P3 BLK 14V IN GND P2 P4 U14 C50 P1 14V IN P7 R84 WHT D3 C51 P6 R14 LOW VDC 2 1 C77 1 R86 C38 R32 R78 R83 R35 R77 R34 C70 C71 R80 R81 R19 R39 VR13 C7 16 R38 1 2 VR9 VR10 VR14 10 R48 C10 7 C9 C69 R98 C68 C74 C73 C40 C44 8 VR12 VR16 J20 R22 R20 7 C72 VR
Mechanical Parts List: PLN1681A Main Chassis Part Number 0200001355 0200835638 0200844628 0300139392 0300139800 0307644M09 0307644M12 0307644M28 0310907C83 0311995A17 0385865C01 0385865C02 0400002645 0400002646 0400007652 0400119331 0400490775 0407643M01 0485061D01 0705723V01 0705725D01 0785688C01 0785689C01 1585693C01 2785687C01 2800048250 2885630D01 2885828C01 3082933N02 3085697C01 3085698C01 3085699C01 3085700C01 3085701C01 3085702C01 3085702C02 3085703C01 3085703C02 3085703C03 3085703C04 3085703C05 308
Motorola 8000 West Sunrise Boulevard Fort Lauderdale, Florida 33322 68P81093C75-A 4
