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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Physical Replacement of the Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . After Installing the New Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Physical Replacement of the Receiver Module . . . . . . . . . . . . .
List of Tables Table 1: Model Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 Table 2: Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2 Table 3: Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Foreword 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.): 1-800-422-420, 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.
3 Introduction 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 December 1, 2000 68P81093C75-O
Models and Specifications 5 Model Chart Table 1: Model Structure Model Description P2066A 132-154 MHz P2067A 150-174 MHz P2068A 403-433 MHz P2069A 438-470 MHz P2070A 470-494 MHz P2071A 494-512 MHz Kit X Description PLD1177_ X X X X X X X X X Receiver VHF R1 PLD1178_ Exciter VHF R2 PLD1179_ Receiver VHF R2 PLD1180_ Exciter VHF R2 PLE1254 Receiver UHF R1 PLE1255 Exciter UHF R1 PLE1256 Receiver UHF R2 PLE1257 Exciter UHF R2 PLE1258 Receiver UHF R3 PLE1259 Exciter UHF R3 X
Table 2: Options OPTION DESIGNATOR DESCRIPTION PURPOSE Q245AL Add: Duplexer, VHF Adds VHF duplexer. Requires customer frequency. Q245AM Add: Duplexer, UHF Adds UHF duplexer. Requires customer frequency. H338AC Add: Transit Case Adds a transit case for increased protection during transport. Maintenance Specifications The following are the PDR 3500 specifications for analog as measured per the revised EIA/TIA 603 Standards and for digital as measured per TIA TSB-102.
Table 4: Specifications, continued DUPLEXER Repeat frequency spread, TX/TX: 300 kHz VHF minimum duplexer T-R separation 3 MHz: 132-174 MHz UHF minimum duplexer T-R separation 3 MHz: 403-520 MHz 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: 1.9 A DIMENSIONS Size (English): 20.00 x 15 x 7.75 inches Size (metric): 508 X 381 X 197 mm WEIGHT Weight (English): 41 lbs Weight (metric): 18.
Notes 5-4 December 1, 2000 68P81093C75-O
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 Running H/F 6-# September 27, 2000 68P81093C75-O
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). Hardware Configuration From the Main Menu, press “F2-Service.” Press F2 again to arrive at the Hardware Configuration Screen. 1. The first field to verify is the Hardware Platform field.
1. Access Disable: 1. From the main menu, press “F2-Service.” 2. Press “F6-Status Panel/Software Ver/Set Date and Time.” 3. Press F2 to arrive at the Status Panel Display Screen. 4. From this screen, press F6 to activate the Access Disable function. In this mode, the station will not keyup in response 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.
7. Once the power out is aligned, press F8 to save the settings to the station codeplug. 4. Squelch: 1. From the Alignment Menu, tab over to the Squelch Adjust field and press F2 to perform the alignment. The Squelch control bar is shown in the center of the screen. 2. To open the squelch completely, press F2. To close the squelch completely, press F4. To adjust the squelch between fully open and fully closed, use the Pg Up/Pg Dn keys on the PC. 3.
Analog/ASTRO CAI, or CAI RX WIDE DEV. 3. Move to page 2 of the Channel Information Screen by pressing the Pg Dn key. Set the Tx Power Out to the desired power level. (The Battery Backup field has no effect on station operation since there is no battery option for the PDR 3500.) For a more complete description of the Channel Information fields, please refer to the Quantar RSS User’s Guide.
Using this configuration, only one antenna is required for both transmit and receive. The duplexer is mounted to the station top panel and has a single N-type connector for the antenna. An N-toUHF adapter is provided. Separate RX and TX Connectors In order to use two antennas, first disconnect the duplexer (if equipped). Connect the Rx antenna to the UHF connector labeled “RX” on the top panel, and the Tx antenna to the UHF connector labeled “TX” (Figure 2).
8 Operation Description This section describes the switches, pushbuttons, connectors, and LED indicators on the PDR 3500 used during local operation of the station and servicing. 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.
Wireline Connections (RJ-45) Duplexer 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 7 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. Requires Null Modem Cable (Motorola part number 30-80369E31).
9 Troubleshooting 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.
PROCEDURE 1 ROUTINE MAINTENCE VISIT 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 PROCED
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 5 for the location of all LED indicators on the station’s equipment.
Table 8: PDR 3500 LED Indicator Functions (Continued) LED Location STATION CONTROL MODULE (SCM) LED Name Status Definition STATION ON – GREEN when SCM fully functional – FLASHING when front panel switch press detected – OFF for SCM failure Station Fail – RED for SCM failure – OFF when SCM fully functional (no failure) Intcm/Acc D –YELLOW when station is in Intercom mode – FLASHING when station is in Access Disable mode – OFF when station is not in Intercom mode Control Ch – GREEN when station is
9-8 December 1, 2000 68P81093C75-O
STATION CONTROL MODULE (Front Panel - Cover Plate Removed) Station On Station Fail Intrem/AccD Control Ch Rx 1 Active Rx 2 Active Rx Fail Aux LED Handset Speaker RSS Port Intercom/Shift CSQ/PL/Off Vol Down/ Access Disable Vol Up/Local PTT 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 PDR 3500 LED Indicators and Front Panel Buttons and Connectors 68P81093C75-O Novem
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 - 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 - 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.
Verifying Receiver Circuitry • Remove test equipment. • Restore the station to normal service. • Return to the trouble shooting flow chart to resume the troubleshooting sequence. 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 receiver circuitry.
Verifying Receiver Circuitry Procedure Step 1. Connect test equipment by performing Step 1 through 3 shown in Figure 7. NOTE: The cover plate over the SCM side of the chassis must be removed to perform these tests. Step 2. Disable PL and carrier squelch by repeatedly pressing the PL/CSQ/Off button until receiver noise is heard through the handset (or external speaker). Refer to Figure 5 for the location of the PL/CSQ/Off button.
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). 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 7 0 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 7 0 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 A.
Station Control Module 2 1 Press and hold Shift Button. 3 Intcm/Acc D LED should Flash yellow. Press Vol Down/ Access Disable 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 8B.
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. The following lights should indicate that the station is now operating as a repeater: • Yellow Access Disable light stops flashing • PA Full LED on the Exciter Module lights when the station is receiving. Step 15. Test the 12 dB SINAD sensitivity.
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.
• VHF: 0.29 µV (-117.7 dBm) • UHF: 0.43 µV (-114.4 dBm) NOTE: For VHF and UHF stations only, refer to 5. Preselector Field Tuning Procedure in this section, for procedures to tune the receiver preselector. 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 Terminal Tabs J20 F P10 F P9 P5 G A E RSS H I Tx Fan J K Receiver Fan Exciter PA MAEPF-27080-O Figure 10 Interconnect Diagram Reference 9-24 From To Description A Top panel UHF Receiver mini-UHF B Top panel AC connector Power supply terminals H, N, GND 120/240 VAC to power supply Receive RF coaxial cable C Power supply terminals POS, NEG Backplane terminals WHT, BLK D Top panel DC connector Backplane terminals BLU,
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 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.
Care of Gold-Plated Connector Contacts • Do not insert or remove modules with power applied. Always turn off the station by unplugging the AC and DC cords from the top panel before inserting or removing modules. • All spare modules should be kept in a conductive bag for storage and transporting. When shipping modules to the repair depot, always pack them in conductive material.
Station Control Before Removing the Old Station Control Module A new SCM contains settings in a codeplug (EEPROM). Those settings can be configured, using the RSS, after the module has been installed. If the old SCM is capable of communicating with the RSS, the old codeplug can be read from the SCM and saved to disk to be programmed into the new SCM. This is described in the Setup and Connections section of this manual, and in the RSS User’s Guide (68P81085E35).
If no preexisting codeplug is available, the new codeplug must be configured manually using the RSS. See the Setup and Connections section of this manual or the RSS User’s Guide (68P81085E35) for details. 2. Perform the following alignment procedures as described in the RSS User’s Guide (68P81085E35) or the Setup and Connections section of this manual, or both.
• Two-wire/four-wire select jumper • DC remote control selection jumpers 6. 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. (Do not slam the board against the backplane or push any harder than necessary to seat the connectors.) 7. If desired, power up the station while it is still out of the case to make sure the module is securely in place.
3. Remove the cover plate on the left end of the front of the station by removing two Torx screws from the front of the plate. Remove the four Phillips screws from the side and bottom edges of the plate. Remove two more Phillips screws from the bottom of the chassis under the preselector. 4. A coaxial cable runs from the receiver’s preselector, through the center wall of the chassis, and to the top panel UHF connector.
Exciter Frequency Band Considerations When replacing the Exciter Module, it is important to remember the frequency-sensitive nature of the Exciter/Power Amplifier combination. The Exciter and the PA must match according to the model breakdown table in this manual. If an Exciter with a new frequency band is being installed, the corresponding PA must be installed, as described in the Power Amplifier subsection of “Module Replacement.” Physical Replacement of the Exciter Module 1.
Power Amplifier Frequency Band Considerations When replacing the Power Amplifier, it is important to remember the frequency-sensitive nature of the Exciter/Power Amplifier combination. The Exciter and the PA must match according to the model breakdown table in this manual. If a PA with a new frequency band is being installed, the corresponding Exciter must be installed, as described in the Exciter subsection of “Module Replacement.
5. Reconnect all four cables removed in Step 4. The ribbon cable connector is keyed so it cannot be attached incorrectly. Remember to reattach the metal clip over the ribbon cable connector. 6. Take the sheet of black thermal conductive film that was between the old PA and the chassis and place it on the new PA. 7. Place the PA in the chassis and line up the screw holes in the PA and the thermal film with the holes in the top panel of the chassis.
7. Finish reassembling the station as described in Steps 8 through 12 of the Backplane subsection of “Module Replacement.” 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.
9. Lay the new backplane behind the station, and attach all the wires as shown in Figure 10: Interconnect Diagram. 10. Hold the backplane in position behind the chassis. Ensure the wires from the backplane do not bind against the Power Supply. Slide the top of the board toward the chassis top panel, making sure the two RJ-45 connectors fit into their cutouts. 11. Hold the Receiver Module from the front of the chassis, and press the bottom center of the backplane into place against the chassis.
Required Test Equipment The following test equipment is required to properly tune the preselector assembly: • RF Signal Generator: Motorola R2600 Communications Analyzer, R2001 Communications Analyzer (see note), or HP8656A signal generator (or equivalent) • Dip/Peak Monitor: HP435B Power Meter (or equivalent) with HP8484A sensitive power head, Boonton Model 92E with BNC input, or R2001/ R2600, using the spectrum analyzer function. • Torque Driver, capable of delivering 12 in. – lb.
Step 3. If Receiver Module is Range 1, determine the alignment frequency as follows: If the frequency (from Step 2) is < 134 MHz, then the alignment frequency = 133.75 MHz. If the frequency (from Step 2) is > 152 MHz, then the alignment frequency = 152 MHz. Otherwise, use the actual frequency from Step 2. Step 4. If the Receiver Module is Range 2, determine the alignment frequency as follows: If the frequency (from Step 2) is < 152 MHz, then the alignment frequency = 151.75 MHz.
If the alignment frequency (calculated in the previous section) is greater than 148 MHz (Range 1), or greater than 156 MHz (Range 2), turn the five tuning screws in (clockwise) until 1/8" protrudes past each of the tension nuts. If the alignment frequency is less than, or equal to 148 MHz (Range 1), or 156 MHz (Range 2), back out (counterclockwise) the five tuning screws until 3/4" protrudes past each of the tension nuts. Step 5.
Step 3. Insert the tuning probe into the cavity “H1” and adjust tuning screw 1 for a PEAK. Step 4. Leave the tuning probe in cavity “H1” and adjust tuning screw 2 for a DIP. Step 5. Insert the tuning probe into cavity “H2” and adjust tuning screw 3 for a DIP. Step 6. Insert the tuning probe into cavity “H3” and adjust tuning screw 4 for a DIP. Step 7. Insert the tuning probe into cavity “H4” and decrease the output from the signal generator to -5 dBm. Step 8. Adjust tuning screw 5 for a DIP.
If the frequency (from Step 1) is > 431 MHz, then the alignment frequency = 431 MHz. If the frequency (from Step 1) is < 405 MHz, then the alignment frequency = 405 MHz. Otherwise, use the actual frequency from Step 1. Step 3. If Receiver Module is Range 2, determine the alignment frequency as follows: If the frequency (from Step 1) is > 468 MHz, then the alignment frequency = 468 MHz. If the frequency (from Step 1) is < 440 MHz, then the alignment frequency = 440 MHz.
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. Remove the two Torx screws from the Receiver Module front panel and remove the four Phillips screws. Remove the panel. 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.
Step 3. Insert the tuning probe into the cavity “U2” and adjust tuning screw 2 for a PEAK. Step 4. Tighten tension nut on tuning screw 2 to at least 12 in. – lb. and fine tune tuning screw 2 for a PEAK. 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.
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 16. for the following functional theory of operation.
Power Amplifier Module Operation The PDR 3500 uses the mid-power Spectra RF power amplifier (RF PA) board, housed in a heavy-duty, shielded, aluminum heat sink. The gain of the RF PA board is controlled by the power control voltage from the Exciter Module. The modulated RF signal is amplified by the RF PA and sent to the site transmit antenna.
Station Control Module Introduction The Station Control Module (SCM) is the microprocessor-based controller for the station. Major components include the following: • MC68360 microprocessor, • 56002 Digital Signal Processor (DSP) • Two Application Specific Integrated Circuit (ASIC) devices (host and DSP). Station Control Module Operation The Host Microprocessor (µP) serves as the controller for the SCM, operating from the station software stored in FLASH memory.
• Two FLASH memory ICs (which contain the WIB operating software downloaded by the SCM) • An ASIC device to process and route the various audio signals Analog, SECURENET, and ASTRO signals are processed as follows: • Analog signals are converted to digital signals and routed to the Station Control Module via the Time Division Multiplex (TDM) bus. • ASTRO and ASTRO CAI data signals are processed by an ASTRO modem card (the daughter board is plugged into the WIB) and sent to/from the SCM via the HDLC bus.
Block Diagram, Schematics, Electrical Parts List, and Circuit Board Detail 68P81093C75-O December 1, 2000 11 11-1
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.
LN+5 LN+5 LN+5 SPICLK R62 10K R27 0 A0-CS1 MC74HC86 13 A1-CS2 C68 5 P1010 6.2K 2 MC33074 P1 1 POWER SUPPLY + P1 2 R32 5.62K 1% A+ 4 20K VFINALFORWARD Y3 6 C45 470pF R35 LN+5 P7 2 14 FAN P5 1 P8 2 P5 3 P8 3 ANTENNA RELAY P8 1 P9 2 LED_GREEN P9 3 LED_RED P9 4 PTT_SWITCH P9 5 RESET_SWITCH P9 1 10K 1% R40 16.2K 1% C69 100pF 2 U3 1 R36 10K 1% C70 100pF 13 R21 16.2K 1% U3 R19 18.2K 1% C71 14 12 MC33074 100pF R22 10.
J2 43 HDLCCLK J8 53 RTS1 M21 A+ SW+5 A+ SW+5 A+ SW+5 A+ SW+5 A0-CS1 J8 52 J2 53 J2 22 J5 22 J7 5 J7 31 VR10 J2 41 J2 23 J5 23 J7 6 J8 6 J9 5 J6 53 J2 24 J5 24 J7 7 J8 13 J9 6 J6 79 J7 41 J2 26 J2 27 J5 25 J8 14 J9 7 J5 26 J7 9 J8 26 J9 8 J5 27 J7 10 J8 27 J9 9 J2 78 J5 28 J8 28 J7 11 J6 80 J2 29 J5 29 J7 12 J8 29 J9 11 J2 30 J5 30 J7 13 J8 30 J9 12 J2 77 J5 54 M16 J8 31 J9 48 AMUXCTRL J2 32 J5 32 J7 15 J8 38 J9 49 BMUXCTRL J8 21 A2 M18
Electrical Parts List: Backplane Circuit Board Reference Motorola Part Number Description C1 C2, C3 C4 C5 C6 C7 C8 C9 C10 2113741B69 2113740F67 2311049A19 2113740F67 2311049A19 2113740F67 2313748R01 2113740F67 2113743B22 CAPACITOR, Fixed: pF±5%; 50V Unless otherwise stated 0.1uF 470 10 uF 470 10uF 470 330uF 470 0.27uF C11 C12 2113741F29 2313748R01 1500 330uF C13 C14 2113740F67 2113741B69 470 0.
D VR27 D Q4 R62 R21 R22 R19 C77 C11 C8 C7 1 R7 R42 S1 C49 C6 C45 C42 R35 D1 C10 C9 VR2 C68 VR5 C82 L13 9 VR1 R43 D2 C5 R8 8 R33 C40 R17 R18 R31 C39 C46 L10 16 U12 L1 1 C38 R16 C73 C74 C67 C34 C35 C44 C71 C70 R34 7 8 C72 R6 1 C61 C12 U6 C48 U7 C3 5 C4 R49 R48 BLK U14 P6 P1 P7 P2 P4 C50 BLU P3 C64 R36 R37 R39 C69 U3 8 R32 R26 R27 R28 C15 L8 VR12 R47 14 U15 7 C41 C62 7 14 R5 1 2 9 10 G S 1 1 WHT C51 RED Q5 G S R14 R61 VR36
*6881093C75* 68P81093C75-O 4 Motorola 8000 West Sunrise Boulevard Fort Lauderdale, Florida 33322
