Motorola EP450 Service Manual
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Motorola EP450 Service Manual

Vhf 146-174 mhz uhf 403-440 mhz uhf 438-470 mhz uhf 465-495 mhz
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MOTOROLA, The Stylized M logo are trademarks of Motorola, Inc.
All other product or service names are the property of their respective owners.
© 2003 Motorola, Inc. All rights reserved. Printed in U.S.A.
HKLN4216A
HKLN4216A
EP450
™
Portable Radio
Detailed Service Manual

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  • Page 1 ™ Portable Radio Detailed Service Manual MOTOROLA, The Stylized M logo are trademarks of Motorola, Inc. All other product or service names are the property of their respective owners. © 2003 Motorola, Inc. All rights reserved. Printed in U.S.A. HKLN4216A...
  • Page 2 EP450 Portable Radio Detailed Service Manual VHF 146-174 MHz UHF 403-440 MHz UHF 438-470 MHz UHF 465-495 MHz Motorola, Inc. 1301 E. Algonquin Road HKLN4216A Schaumburg, IL 60196...

  • Page 3: Product Safety And Rf Exposure Compliance

    Motorola. Furthermore, the purchase of Motorola products shall not be deemed to grant either directly or by implication, estoppel, or otherwise, any license under the copyrights, patents or patent applications of Motorola, except for the normal non-exclusive license to use that arises by operation of law in the sale of a product.

  • Page 4: Table Of Contents

    Table of Contents Table of Contents Foreword............................ii Product Safety and RF Exposure Compliance ..................ii Computer Software Copyrights......................ii Document Copyrights ........................ii Disclaimer ............................ii List of Figures .....................viii List of Tables ....................ix Related Publications ..................x Module 1: VHF 146-174 MHz Chapter 1 Test Equipment, Service Aids, and Service Tools...............
  • Page 5 Table of Contents Chapter 4 VHF Theory Of Operation ........... 4-1 Introduction ............................ 4-1 VHF Receiver..........................4-1 4.2.1 Receiver Front-End......................4-1 4.2.2 Receiver Back-End ......................4-2 VHF Transmitter..........................4-3 4.3.1 Transmit Power Amplifier ....................4-3 4.3.2 Antenna Switch ......................... 4-3 4.3.3 Harmonic Filter........................
  • Page 6 Table of Contents Module 2: UHF 403-440, 438-470, 465-495 MHz Chapter 7 403-440 MHz UHF Theory Of Operation ......7-1 Introduction ............................ 7-1 UHF Receiver ..........................7-1 7.2.1 Receiver Front End ......................7-1 7.2.2 Receiver Back End ......................7-2 UHF Transmitter ..........................7-3 7.3.1 Transmitter Power Amplifier .....................
  • Page 7 Table of Contents Chapter 10 UHF Troubleshooting Tables ........... 10-1 10.1 Troubleshooting Table for Receiver..................... 10-1 10.2 Troubleshooting Table for Synthesizer ..................10-3 10.3 Troubleshooting Table for Transmitter..................10-4 10.4 Troubleshooting Table for Board and IC Signals ................. 10-6 Chapter 11 UHF Schematic Diagrams, Overlays, and Parts Lists ...
  • Page 8 Table of Contents UHF (438-470 MHz) Radio Parts List....................11-37 UHF (438-470 MHz) Keypad Board Parts List ..................11-40 UHF 465-495 MHz Schematic Diagrams, Overlays, and Parts Lists ..............11-41 Figure 11-30. UHF (465-495 MHz) Radio Circuit Block Diagram ............11-41 Figure 11-31.

  • Page 9: List Of Figures

    Table of Contents List of Figures Figure 1-1. Programming/Test Cable....................1-4 Figure 1-2. Wiring of the Connectors ....................1-4 Figure 2-1. DC Power Distribution Block Diagram................2-1 Figure 4-1. VHF Receiver Block Diagram................... 4-1 Figure 4-2. VHF Transmitter Block Diagram..................4-3 Figure 4-3.
  • Page 10 Table of Contents Figure 11-6. UHF (403-440 MHz) PCB 8486635Z03-O Synthesizer Schematic Diagram ....11-8 Figure 11-7. UHF (403-440 MHz) Voltage Controlled Oscillator Schematic Diagram ......11-9 Figure 11-8. UHF (403-440 MHz) PCB 8486635Z03-O Transmitter and Power Control Schematic Diagram ...................... 11-10 Figure 11-9.

  • Page 11: List Of Tables

    Table of Contents List of Tables Table 1-1. Recommended Test Equipment ..................1-1 Table 1-2. Service Aids........................1-2 Table 1-3. Recommended Service Tools ..................1-2 Table 2-1. Voltage Regulators ......................2-2 Table 3-1. Radio Memory Requirements................... 3-1 Table 3-2. SPI Bus Signal Definitions....................3-2 Table 5-1.

  • Page 12: Chapter 1 Test Equipment, Service Aids, And Service Tools

    Chapter 1 Test Equipment, Service Aids, and Service Tools Test Equipment Table 1-1 lists test equipment required to service the EP450 Radios. Table 1-1. Recommended Test Equipment Motorola Part No. Description Characteristics Application R2600 series System analyzer This item will substitute for...

  • Page 13: Service Aids

    Service Aids Table 1-2 lists service aids recommended for working on the EP450 Radios. While all of these items are available from Motorola, most are standard shop equipment items, and any equivalent item capable of the same performance may be substituted for the item listed.
  • Page 14 Test Equipment, Service Aids, and Service Tools: Service Aids Table 1-3. Recommended Service Tools (Continued) Motorola Part Description Application RLN4062 Hot air workstation, 120 V Tool for hot air soldering/desoldering of surface mounted integrated circuits 0180386A78 Illuminated magnifying glass with...

  • Page 15: Figure 1-1. Programming/Test Cable

    Test Equipment, Service Aids, and Service Tools: Service Aids Programming/Test Cable 25 POSITION 25 POSITION MALE CONNECTOR FEMALE CONNECTOR 36.0” CABLE 36.0” CABLE Figure 1-1. Programming/Test Cable 25 pin Male D Connector Components molded inside 2.5mm stereo and 3.5mm Orange 3.5mm Tip (Speaker +) Blue...

  • Page 16: Chapter 2 Dc Power Distribution

    Chapter 2 DC Power Distribution DC Regulation and Distribution A block diagram of the DC power distribution throughout the radio is shown in Figure 2-1. Accessories 20 pin Connector Audio Power Keypad/Option Board Amplifier Vdda Vdda Regulator UNSWB+ SWB+ Vddd 7.5V Vddd Battery...

  • Page 17: Table 2-1. Voltage Regulators

    DC Power Distribution: DC Regulation and Distribution When the radio is turned on, SWB+ is present and is applied to: • transistor switch Q494 (pins 1 and 6) which turns on Q493 • RX audio power amplifier U490 • voltage divider R420/R421 and port PE0, a microprocessor A/D input which measures battery voltage and radio on/off status The output of FET switch Q493 is applied to the control pins of regulators U310, U320 and U330, turning them on.

  • Page 18: Chapter 3 Controller Theory Of Operation

    6-11 and 6-12). 3.1.1 Microprocessor Circuitry The microprocessor circuitry includes microprocessor (U401) and associated EEPROM, S-RAM (not used in EP450 models), and Flash ROM memories. The following memory IC's are used: Table 3-1. Radio Memory Requirements Reference No. Description Type...

  • Page 19: Memory Usage

    Controller Theory of Operation: Controller 3.1.1.1 Memory Usage Radio operation is controlled by software that is stored in external Flash ROM memory (U404). Radio parameters and customer specific information is stored in external EEPROM (U402). The operating status of the radio is maintained in RAM located within the microprocessor. When the radio is turned off, the operating status of the radio is written to EEPROM before operating voltage is removed from the microprocessor.

  • Page 20: Interface To Rss Programming

    Controller Theory of Operation: Controller In order for each circuit block to respond only to the data intended for it, each peripheral has its own chip select (or chip enable) line. The device will only respond to data when its enable line is pulled low by one of the microprocessor ports, as follows: •...

  • Page 21: Boot Mode Control

    Controller Theory of Operation: Controller The microprocessor reset line (pin 94) can be controlled directly by the digital 3.3 V regulator (U320 pin 7), the microphone jack (part of accessory connector J471) via Q472 and Q471, and the microprocessor itself. U320 pulls the reset line low if the digital 3.3 V source loses regulation. This prevents possible MOS latch-up or overwriting of registers in the microprocessor because the reset line is higher in voltage than the microprocessor VDD ports (U401 pins 12, 39, 59, 88).

  • Page 22: Audio Power Amplifier

    The Motorola RLN4460 Portable Test Set and AAPMKN4004 Programming Test Cable provide the proper interface between the radio's ungrounded audio output and ground-referenced test equipment.

  • Page 23: Vox Operation

    Controller Theory of Operation: Controller 3.1.2.5 VOX Operation VOX audio accessories do not have a PTT switch. Instead, the mic cartridge is wired directly from J471-4 to ground. If the radio has been programmed for VOX operation and the VOX accessory is plugged in prior to turning the radio on, the current drawn by the cartridge will turn on Q470 (pins 3- 4-5) and a logic high will be seen at port PJ1 at turn-on.

  • Page 24: Chapter 4 Vhf Theory Of Operation

    Chapter 4 VHF Theory Of Operation Introduction This chapter provides a detailed theory of operation for the radio components. Schematic diagrams for the circuits described in the following paragraphs are located in Chapter 6 of this manual. VHF Receiver The VHF receiver covers the range of 146-174 MHz and provides switchable IF bandwidth for use with 12.5 kHz or 20/25 kHz channel spacing systems.

  • Page 25: Receiver Back-End

    VHF Theory Of Operation: VHF Receiver constant at 6.2 mA regardless of device and temperature variations, for optimum dynamic range and noise figure. The output of the RF amplifier is applied to the interstage filter, a fixed-tuned 3-pole series-coupled resonator design having a 3 dB bandwidth of 58 MHz and insertion loss of 1.8 dB. This filter has an image rejection of 42 dB at 235 MHz, with increasing attenuation at higher frequencies.

  • Page 26: Vhf Transmitter

    VHF Theory Of Operation: VHF Transmitter VHF Transmitter The VHF transmitter covers the range of 146-174 MHz. Depending on model, the output power of the transmitter is either switchable on a per-channel basis between high power (5 watts) and low power (1 watt).

  • Page 27: Antenna Matching Network

    VHF Theory Of Operation: VHF Frequency Generation Circuitry 4.3.4 Antenna Matching Network The harmonic filter presents a 50 Ω impedance to antenna jack J140. A matching network, made up of C140-C141 and L140, is used to match the antenna impedance to the harmonic filter. This optimizes the performance of the transmitter and receiver into the impedance presented by the antenna, significantly improving the antenna's efficiency.

  • Page 28: Fractional-N Synthesizer

    VHF Theory Of Operation: VHF Frequency Generation Circuitry Transmit modulation from the ASFICcmp (U451 pin 40) is applied to U201 pin 10 (MOD_IN). An electronic attenuator in the ASFICcmp adjusts overall transmitter deviation by varying the audio level applied to the synthesizer IC. Internally the audio is digitized by the Fractional-N synthesizer and applied to the loop divider to provide the low-port modulation.

  • Page 29: Voltage Controlled Oscillator (Vco)

    VHF Theory Of Operation: VHF Frequency Generation Circuitry One of the auxiliary outputs of the synthesizer IC (AUX3, U201 pin 2) provides the TRB signal which determines the operating mode of the VCO, either receive or transmit. DATA (U401 Pin 100) LOCK LOCK (U401 Pin 56) DATA...

  • Page 30: Keypad

    VHF Theory Of Operation: Keypad C267, and varactor D262. High-port audio modulation from the synthesizer IC is applied as VCO_MOD to varactor D261 which modulates the transmit VCO. AUX3 (U201 Pin 2) TRB_IN Pin 20 Pin 19 Pin 7 TX/RX/BS Pin 13 Switching Network Prescaler Out...
  • Page 31 VHF Theory Of Operation: Keypad Notes: November 24, 2003 HKLN4216A...

  • Page 32: Chapter 5 Vhf Troubleshooting Tables

    Chapter 5 VHF Troubleshooting Tables Troubleshooting Table for Receiver Table 5-1. Troubleshooting Table for Receiver Symptom Possible Causes Procedure Corrective Action Radio Dead (no 1. Battery dead or defec- Substitute known good battery or Charge or replace battery. turn-on beep, no tive.
  • Page 33 VHF Troubleshooting Tables: Troubleshooting Table for Receiver Table 5-1. Troubleshooting Table for Receiver (Continued) Symptom Possible Causes Procedure Corrective Action No Audio 1. Synthesizer out of lock Verify U201-4 is at 3 V dc. Troubleshoot synthesizer/VCO circuits. 2. Defective IFIC Verify audio is present at U51-8.

  • Page 34: Troubleshooting Table For Synthesizer

    VHF Troubleshooting Tables: Troubleshooting Table for Synthesizer Troubleshooting Table for Synthesizer Table 5-2. Troubleshooting Table for Synthesizer Symptom Possible Causes Procedure Corrective Action Synthesizer Out of 1. VCO fault Verify oscillator is working, check RF Check VCO tank components Lock (RX mode level at U251-10 per schematic.

  • Page 35: Troubleshooting Table For Transmitter

    VHF Troubleshooting Tables: Troubleshooting Table for Transmitter Troubleshooting Table for Transmitter Table 5-3. Troubleshooting Table for Transmitter Symptom Possible Causes Procedure Corrective Action No Transmit (no TX 1. PTT switch defective. Verify U401-71 goes low when PTT Replace PTT switch S441. LED indication) is pressed.
  • Page 36 VHF Troubleshooting Tables: Troubleshooting Table for Transmitter Table 5-3. Troubleshooting Table for Transmitter (Continued) Symptom Possible Causes Procedure Corrective Action Low Power 1. Low TX injection Check that RF level at jct. R100/ Check U251, L291-292, C290- R101 per schematic. 291.
  • Page 37 VHF Troubleshooting Tables: Troubleshooting Table for Transmitter Table 5-3. Troubleshooting Table for Transmitter (Continued) Symptom Possible Causes Procedure Corrective Action No EXT MIC audio 1. Mic bias fault Verify approx 1.8 V dc across EXT Check Q470. R475, R477, MIC cartridge in TX mode. Verify L471.

  • Page 38: Troubleshooting Table For Board And Ic Signals

    VHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals Troubleshooting Table for Board and IC Signals Table 5-4. Troubleshooting Table for Board and IC Signals IC Designator Pin Function DC Voltage Comments (Condition) RF input 44.85 MHz 1.20 IFIC RF input decoupling 1.20 2nd LO osc output...
  • Page 39 VHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals Table 5-4. Troubleshooting Table for Board and IC Signals (Continued) IC Designator Pin Function DC Voltage Comments (Condition) U110 RF input (TX mode) RF Power Amp Vgg (gate bias) 2.65 (typ) (TX mode) (4.25 V typ at VHF) 6.59 (TX mode)
  • Page 40 VHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals Table 5-4. Troubleshooting Table for Board and IC Signals (Continued) IC Designator Pin Function DC Voltage Comments (Condition) U201 Ref osc XTAL2 Freq Synthesizer Ref osc warp output 3.00 Superfilter cap 4.48 Superfilter base (NU) 3.76...
  • Page 41 5-10 VHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals Table 5-4. Troubleshooting Table for Board and IC Signals (Continued) IC Designator Pin Function DC Voltage Comments (Condition) U251 Prescaler output 2.26 VCO / Buffer TX switch output (NU) 0.06 Vcc_BUFFERS 3.00...
  • Page 42 VHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals 5-11 Table 5-4. Troubleshooting Table for Board and IC Signals (Continued) IC Designator Pin Function DC Voltage Comments (Condition) U401 PB1_ADDR9 3.05 Microprocessor PB2_ADDR10 0.16 3.23 PBO_ADDR8 3.05 PB5_ADDR13 0.13 PG1_XA14 0.20 PG4_XA17...
  • Page 43 5-12 VHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals Table 5-4. Troubleshooting Table for Board and IC Signals (Continued) IC Designator Pin Function DC Voltage Comments (Condition) U401 PH1_PW2 3.00 Microprocessor PH0_PW1 3.23 Synth chip select XIRQ 3.00 1.48 RX enable 0.01...
  • Page 44 VHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals 5-13 Table 5-4. Troubleshooting Table for Board and IC Signals (Continued) IC Designator Pin Function DC Voltage Comments (Condition) U401 PA3_IC4_OC5_OC1 3.00 Microprocessor PA4_OC4_OC1 Squelch detect input PA5_OC3_OC1 Channel activity input PA6_OC2_OC1 PA7_PA1_OC1 VSSR...
  • Page 45 5-14 VHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals Table 5-4. Troubleshooting Table for Board and IC Signals (Continued) IC Designator Pin Function DC Voltage Comments (Condition) U404 3.17 Flash ROM 0.30 0.22 3.03 3.08 3.06 0.24 3.08 3.05 3.05 0.69...
  • Page 46 VHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals 5-15 Table 5-4. Troubleshooting Table for Board and IC Signals (Continued) IC Designator Pin Function DC Voltage Comments (Condition) U451 GCB1 general purpose output ASFIC_CMP GCB0 general purpose output 3.00 BW select (25 kHz mode) Squelch channel activity output To U401-84...
  • Page 47 5-16 VHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals Table 5-4. Troubleshooting Table for Board and IC Signals (Continued) Notes: IC Designator Pin Function DC Voltage Comments (Condition) U480 Unit 1 output 2.48 Dual Opamp Unit 1 (-) input 2.48 Unit 1 (+) input 2.46...

  • Page 48: Chapter 6 Vhf Schematic Diagrams, Overlays, And Parts Lists

    (pF) or microfarads (µF), and inductance values are in nanohenries (nH) or micro- henries (µH). 2. DC voltages are measured from point indicated to chassis ground using a Motorola DC multi- meter or equivalent. If the board has been removed from the chassis, the transmitter module mounting screws may be used for ground connection.
  • Page 49 VHF Schematic Diagrams, Overlays, and Parts Lists: Introduction Ref. No. Series Circuit Block 301-400 DC Regulation 401-450 Microprocessor 451-550 Audio 7. Circuit Block Interconnection Legend: Name Description USWB+ Unswitched Battery Voltage (always on) 5 volts (regulated) 5 volts in RX mode only 5 volts in TX mode only RESET Low-line reset signal from U320 to uP...

  • Page 50: Six Layer Circuit Board

    Speaker and Microphone Schematic MATES WITH J470 ON RADIO BOARD MATES WITH J491 ON RADIO BOARD Figure 6-2. Speaker and Microphone Schematic 6.2.1 Speaker and Microphone Parts List Reference Motorola Part Description Designator 5085880L01 Microphone, electret 5085738Z08 Speaker assembly with connector HKLN4216A...
  • Page 51 VHF Schematic Diagrams, Overlays, and Parts Lists: Speaker and Microphone Schematic Notes: November 24, 2003 HKLN4216A...

  • Page 52: Figure 6-3. Vhf (146-174 Mhz) Radio Circuit Block Interconnect Diagram

    VHF 146-174 MHz PCB 8486342Z13-C Schematic Diagrams, Overlays, and Parts Lists Chapter 6 VHF 146-174 MHz PCB 8486342Z13-C Schematic Diagrams, Overlays, and Parts Lists VHF R2 USWB+ USWB+ USWB+ USWB+ TX_ENA TX_ENA PWR_SET TX_VHF_R2 PWR_SET RX_FE_VHF_R2 DEMOD DEMOD RX_BE BW_SEL BW_SEL IF_IN IF_OUT...

  • Page 53: Figure 6-4. Vhf (146-174 Mhz) Pcb 8486342Z13-C Receiver Front End Schematic Diagram

    146-174 MHz Schematic Diagrams, Overlays, and Parts Lists Chapter 6 146-174 MHz Schematic Diagrams, Overlays, and Parts Lists VHF R2 Front End FE_5R 6.8K 1000pF FE_IF_OUT SH40 IF_OUT SHIELD SHIELD UMT1 680nH 150nH 82pF 100nH 1000pF 1000pF 6.8K 0.1uF 30pF 68nH 68nH 68nH...

  • Page 54: Figure 6-5. Vhf (146-174 Mhz) Receiver Back End Schematic Diagram

    VHF 146-174 MHz PCB 8486342Z13-C Schematic Diagrams, Overlays, and Parts Lists RX Back End (Overtone) U52-1 FL53 TC7W04F CFWC455E 0.1uF OUT 2 U52-2 100K TC7W04F IF_BAND_SEL 5V for 25kHz BW_SE L 0V for 12.5kHz 0.1uF FL54 CFWC455G 1 IN 47pF U52-3 3.3K SH50...

  • Page 55: Figure 6-6. Vhf (146-174 Mhz) Pcb 8486342Z13-C Synthesizer Schematic Diagram

    146-174 MHz Schematic Diagrams, Overlays, and Parts Lists VHF R2 Synthesizer FN_V_SF 4.5V V_SF C231 C232 C233 SH200 SH201 R247 R230 0.1uF 1000pF SHIELD SHIELD 4.7uF 270K 200K FN_LOCK LOCK C204 LOCK: 3V UNLOCK: 0V WARP 25 470pF INDMULT 16 SFOUT 28 ADAPTSW 46 FN_V_STEER...

  • Page 56: Figure 6-7. Vhf (146-174 Mhz) Voltage Controlled Oscillator Schematic Diagram

    VHF 146-174 MHz PCB 8486342Z13-C Schematic Diagrams, Overlays, and Parts Lists VHF R2 VCO V_SF VCO_VSF L270 R273 4.5V V_S F 560nH C270 C274 C285 C292 VCO_3V 1200pF 0.1uF 0.1uF 1200pF SH251 SH253 R270 SH250 SHIELD SHIELD SHIELD C272 0.1uF R284 L282 L292...

  • Page 57: Figure 6-8. Vhf (146-174 Mhz) Pcb 8486342Z13-C Transmitter And Power Control Schematic Diagram

    6-10 146-174 MHz Schematic Diagrams, Overlays, and Parts Lists VHF R2 Tx PA_USWB+ USWB+ C170 PA_TX_EN A R171 Q171 TX_ENA 0.1uF MMBT3904 Q170 6.8K EMB10 R524 SH100 SHIELD C172 1500pF C120 R120 C157 C154 1500pF R152 0.1uF 1500pF C155 R158 C151 100K R121...

  • Page 58: Figure 6-9. Vhf (146-174 Mhz) Controller Interconnect Schematic Diagram

    VHF 146-174 MHz PCB 8486342Z13-C Schematic Diagrams, Overlays, and Parts Lists 6-11 Controller SW_B +3 V VS_AUDIO_SEL CNTL_PWR_SET OPT_MI C PWR_SET PWR_SET OPT_TX_AUD_FLAT_RETURN CNTL_DEMO D DEMO D DEMOD OPT_TX_AUD_RETURN CNTL_BW_SEL OPT_TX_AUD_SEN D BW_SEL BW_SEL AUDI O OPT_RX_AUD_SEND_DETECTO R OPT_RX_AUD_SEND_UNMUTED MOD_OUT MOD_OUT CNTL_16_8_MHZ OPT_RX_AUD_RETURN...

  • Page 59: Figure 6-10. Vhf (146-174 Mhz) Pcb 8486342Z13-C Microprocessor Circuitry Schematic Diagram

    6-12 146-174 MHz Schematic Diagrams, Overlays, and Parts Lists Microprocessor D3_3 V D3_3V C418 R410 R416 R417 D3_3V 0.1uF Q410 C410 C411 C412 C413 TP402 R412 R411 0.1uF 1000pF 0.1uF 10uF 100K SC I TP405 SH401 SH400 C419 SHIELD SHIELD 1000pF R419 HOLD...

  • Page 60: Figure 6-11. Vhf (146-174 Mhz) Audio Circuitry Schematic Diagram

    VHF 146-174 MHz PCB 8486342Z13-C Schematic Diagrams, Overlays, and Parts Lists 6-13 R516 R523 Audio C512 C514 R522 Q520 6.8pF 16pF IMX1 100K R512 150K R514 5V_A 100K U510-1 LM2904 Q520 R511 IMX1 C518 R513 DEMOD C460 R515 VR471 100K 0.1uF R470 OPT_RX_AUD_SEND_DETECTO R...

  • Page 61: Figure 6-12. Vhf (146-174 Mhz) Pcb 8486342Z13-C Dc Regulation Schematic Diagram

    6-14 146-174 MHz Schematic Diagrams, Overlays, and Parts Lists DC Regulation USWB+ U310 TK71750S VR301 J301 F301 MMBZ5250B 1 VIN VOUT 4 CTRL D301 C303 C304 C312 C301 BYPASS C311 C313 DATA 390pF .01uF .018uF 10uF .01uF 33uF Q311 C310 .01uF D3_3V BATT_CHARGE...

  • Page 62: Figure 6-13. Vhf (146-174 Mhz) Keypad Board Schematic Diagram

    VHF 146-174 MHz PCB 8486342Z13-C Schematic Diagrams, Overlays, and Parts Lists 6-15 DISPLAY MODULE KEYPAD MAIN BOARD CONNECTOR CONNECTO R LEDBL J2-9 LEDBL J1-9 LEDBL DATA J2-16 16 J1-8 Vddd J2-1 7 J1-7 LCD_SEL J2-1 0 J1-6 J2-1 J1-5 DATA Vddd Vddd J2-2...

  • Page 63: Figure 6-14. Vhf (146-174 Mhz) Pcb 8486342Z13-C Board Component Side

    6-16 146-174 MHz Schematic Diagrams, Overlays, and Parts Lists D301 C465 R480 C458 C488 C454 C513 S444 C480 J471 R470 R473 U451 FL54 R496 C470 L265 L255 C267 D262 C257 R481 R472 C473 C489 C482 R522 C302 R471 C455 F301 U480 C263 C460...

  • Page 64: Figure 6-15. Vhf (146-174 Mhz) Board Solder Side View

    VHF 146-174 MHz PCB 8486342Z13-C Schematic Diagrams, Overlays, and Parts Lists 6-17 C206 R206 C52 C53 C140 L120 C417 R416 C220 R411 U151 L130 L132 C222 R121 R434 R502 R433 L140 R432 C131 C135 C221 FL51 R150 R501 C223 C224 R120 C157 R151...

  • Page 65: Figure 6-16. Vhf (146-174 Mhz) Pcb 8486342Z13-C Keypad Board

    6-18 146-174 MHz Schematic Diagrams, Overlays, and Parts Lists Component Side Solder Side Figure 6-16. VHF (146-174 MHz) PCB 8486342Z13-C Keypad Board November 24, 2003 HKLN4216A...

  • Page 66: Vhf (146-174 Mhz) Radio Parts List

    VHF 146-174 MHz PCB 8486342Z13-C Schematic Diagrams, Overlays, and Parts Lists 6-19 VHF (146-174 MHz) Radio Parts List Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Circuit Motorola Part No. Part No. Part No. Description Part No. 2113743N42 CAP, 47pF...
  • Page 67 6-20 VHF 146-174 MHz PCB 8486342Z13-C Schematic Diagrams, Overlays, and Parts Lists Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. C411 2113743M24 CAP, 0.1uF C480 2113743E20 CAP, 0.1uF...
  • Page 68 VHF 146-174 MHz PCB 8486342Z13-C Schematic Diagrams, Overlays, and Parts Lists 6-21 Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. 0662057N06 RES, 20K R247 0662057N33 RES, 270K R440 0662057M90 RES, 4.7K...

  • Page 69: Vhf (146-174 Mhz) Keypad Board Parts List

    VR475 4880140L20 MMBZ5245B 4802245J84 TSS2_44_395 9186145B02 45B02 Y201* 4880114R06 14R06 Y202 Not_Placed 45J68 * Motorola Depot Servicing only VHF (146-174 MHz) Keypad Board Parts List Circuit Motorola Description Part No. NOTPLACED CAP, 150pF 2113740F55 CAP, 150pF NOTPLACED CAP, 150pF 2113743E20 CAP, 0.1uF...

  • Page 70: Chapter 7 403-440 Mhz Uhf Theory Of Operation

    Chapter 7 403-440 MHz UHF Theory Of Operation Introduction This chapter provides a detailed theory of operation for the radio components. Schematic diagrams for the circuits described in the following paragraphs are located in Chapter 11of this manual. UHF Receiver The UHF receiver covers the range of 403-440 MHz and provides switchable IF bandwidth for use with 20/25/30 kHz or 12.5 kHz channel spacing systems.

  • Page 71: Receiver Back End

    403-440 MHz UHF Theory Of Operation: UHF Receiver The output of the RF amplifier is applied to the interstage filter, a fixed-tuned 4-pole Butterworth shunt-coupled resonator design having a 3 dB bandwidth of 68 MHz centered at 462 MHz, and insertion loss of 3.5 dB.

  • Page 72: Uhf Transmitter

    403-440 MHz UHF Theory Of Operation: UHF Transmitter UHF Transmitter The UHF transmitter covers the range of 403-440 MHz. Depending on model, the output power of the transmitter is either switchable on a per-channel basis between high power (4 watts) and low power (1 watt), or is factory preset to 2 watts.

  • Page 73: Antenna Matching Network

    403-440 MHz UHF Theory Of Operation: UHF Frequency Generation Circuitry 7.3.4 Antenna Matching Network The harmonic filter presents a 50Ω impedance to antenna jack J140. A matching network, made up of C140-C141 and L140, is used to match the antenna impedance to the harmonic filter. This optimizes the performance of the transmitter and receiver into the impedance presented by the antenna, significantly improving the antenna's efficiency.

  • Page 74: Fractional-N Synthesizer

    403-440 MHz UHF Theory Of Operation: UHF Frequency Generation Circuitry SPI_CLK, and SYNTH_CS (chip select) lines (U409 pins 100, 1 and 47 respectively). A logic high (3 V) from U201 pin 4 indicates to the microprocessor that the synthesizer is locked. Buffer Voltage Q280...

  • Page 75: Voltage Controlled Oscillator (Vco)

    403-440 MHz UHF Theory Of Operation: UHF Frequency Generation Circuitry One of the auxiliary outputs of the synthesizer IC (AUX3, U201 pin 2) provides the TRB signal which determines the operating mode of the VCO, either receive or transmit. DATA (U401 Pin 100) LOCK LOCK (U401 Pin 56) DATA...

  • Page 76: Keypad

    403-440 MHz UHF Theory Of Operation: Keypad C267, and varactor D262. High-port audio modulation from the synthesizer IC is applied as VCO_MOD to varactor D261 which modulates the transmit VCO. AUX3 (U201 Pin 2) TRB_IN Pin 20 Pin 19 Pin 7 TX/RX/BS Pin 13 Switching Network...
  • Page 77 403-440 MHz UHF Theory Of Operation: Keypad Notes: November 24, 2003 HKLN4216A...

  • Page 78: Chapter 8 438-470 Mhz Uhf Theory Of Operation

    Chapter 8 438-470 MHz UHF Theory Of Operation Introduction This chapter provides a detailed theory of operation for the radio components. Schematic diagrams for the circuits described in the following paragraphs are located in Chapter 11of this manual. UHF Receiver The UHF receiver covers the range of 438-470 MHz and provides switchable IF bandwidth for use with 20/25/30 kHz or 12.5 kHz channel spacing systems.

  • Page 79: Receiver Back End

    438-470 MHz UHF Theory Of Operation: UHF Receiver The output of the RF amplifier is applied to the interstage filter, a fixed-tuned 4-pole Butterworth shunt-coupled resonator design having a 3 dB bandwidth of 68 MHz centered at 462 MHz, and insertion loss of 3 dB.

  • Page 80: Uhf Transmitter

    438-470 MHz UHF Theory Of Operation: UHF Transmitter UHF Transmitter The UHF transmitter covers the range of 438-470 MHz. Depending on model, the output power of the transmitter is either switchable on a per-channel basis between high power (4 watts) and low power (1 watt).

  • Page 81: Antenna Matching Network

    438-470 MHz UHF Theory Of Operation: UHF Frequency Generation Circuitry 8.3.4 Antenna Matching Network The harmonic filter presents a 50Ω impedance to antenna jack J140. A matching network, made up of C140-C141 and L140, is used to match the antenna impedance to the harmonic filter. This optimizes the performance of the transmitter and receiver into the impedance presented by the antenna, significantly improving the antenna's efficiency.

  • Page 82: Fractional-N Synthesizer

    438-470 MHz UHF Theory Of Operation: UHF Frequency Generation Circuitry SPI_CLK, and SYNTH_CS (chip select) lines (U409 pins 100, 1 and 47 respectively). A logic high (3 V) from U201 pin 4 indicates to the microprocessor that the synthesizer is locked. Buffer Voltage Q280...

  • Page 83: Figure 8-4. Uhf Synthesizer Block Diagram

    438-470 MHz UHF Theory Of Operation: UHF Frequency Generation Circuitry One of the auxiliary outputs of the synthesizer IC (AUX3, U201 pin 2) provides the TRB signal which determines the operating mode of the VCO, either receive or transmit. DATA (U401 Pin 100) LOCK LOCK (U401 Pin 56) DATA...

  • Page 84: Keypad

    438-470 MHz UHF Theory Of Operation: Keypad C267, and varactor D262. High-port audio modulation from the synthesizer IC is applied as VCO_MOD to varactor D261 which modulates the transmit VCO. AUX3 (U201 Pin 2) TRB_IN Pin 20 Pin 19 Pin 7 TX/RX/BS Pin 13 Switching Network...
  • Page 85 438-470 MHz UHF Theory Of Operation: Keypad Notes: November 24, 2003 HKLN4216A...

  • Page 86: Introduction

    Chapter 9 465-495 MHz UHF Theory Of Operation Introduction This chapter provides a detailed theory of operation for the radio components. Schematic diagrams for the circuits described in the following paragraphs are located in Chapter 11of this manual. UHF Receiver The UHF receiver covers the range of 465-495 MHz and provides switchable IF bandwidth for use with 20/25/30 kHz or 12.5 kHz channel spacing systems.

  • Page 87: Receiver Back End

    465-495 MHz UHF Theory Of Operation: UHF Receiver The output of the RF amplifier is applied to the interstage filter, a fixed-tuned 4-pole Butterworth shunt-coupled resonator design having a 3 dB bandwidth of 68 MHz centered at 480 MHz, and insertion loss of 3.3 dB.

  • Page 88: Figure 9-2. Uhf Transmitter Block Diagram

    465-495 MHz UHF Theory Of Operation: UHF Transmitter UHF Transmitter The UHF transmitter covers the range of 465-495 MHz. Depending on model, the output power of the transmitter is either switchable on a per-channel basis between high power (4 watts) and low power (1 watt), or is factory preset to 2 watts.
  • Page 89 465-495 MHz UHF Theory Of Operation: UHF Frequency Generation Circuitry 9.3.4 Antenna Matching Network The harmonic filter presents a 50Ω impedance to antenna jack J140. A matching network, made up of C140-C141 and L140, is used to match the antenna impedance to the harmonic filter. This optimizes the performance of the transmitter and receiver into the impedance presented by the antenna, significantly improving the antenna's efficiency.

  • Page 90: Figure 9-3. Uhf Frequency Generation Unit Block Diagram

    465-495 MHz UHF Theory Of Operation: UHF Frequency Generation Circuitry SPI_CLK, and SYNTH_CS (chip select) lines (U409 pins 100, 1 and 47 respectively). A logic high (3 V) from U201 pin 4 indicates to the microprocessor that the synthesizer is locked. Buffer Voltage Q280...

  • Page 91: Figure 9-4. Uhf Synthesizer Block Diagram

    465-495 MHz UHF Theory Of Operation: UHF Frequency Generation Circuitry One of the auxiliary outputs of the synthesizer IC (AUX3, U201 pin 2) provides the TRB signal which determines the operating mode of the VCO, either receive or transmit. DATA (U401 Pin 100) LOCK LOCK (U401 Pin 56) DATA...

  • Page 92: Figure 9-5. Uhf Vco Block Diagram

    465-495 MHz UHF Theory Of Operation: Keypad C267, and varactor D262. High-port audio modulation from the synthesizer IC is applied as VCO_MOD to varactor D261 which modulates the transmit VCO. AUX3 (U201 Pin 2) TRB_IN Pin 20 Pin 19 Pin 7 TX/RX/BS Pin 13 Switching Network...
  • Page 93 465-495 MHz UHF Theory Of Operation: Keypad Notes: November 24, 2003 HKLN4216A...

  • Page 94: Chapter 10 Uhf Troubleshooting Tables

    Chapter 10 UHF Troubleshooting Tables 10.1 Troubleshooting Table for Receiver Table 10-1. Troubleshooting Table for Receiver Symptom Possible Causes Procedure Corrective Action Radio Dead (no 1. Battery dead or defec- Substitute known good battery or Charge or replace battery. turn-on beep, no tive.
  • Page 95 10-2 UHF Troubleshooting Tables: Troubleshooting Table for Receiver Table 10-1. Troubleshooting Table for Receiver (Continued) Symptom Possible Causes Procedure Corrective Action No Audio 1. Synthesizer out of lock Verify U201-4 is at 3V dc. Troubleshoot synthesizer/VCO circuits. 2. Defective IFIC Verify audio is present at U51-8.

  • Page 96: Troubleshooting Table For Synthesizer

    UHF Troubleshooting Tables: Troubleshooting Table for Synthesizer 10-3 10.2 Troubleshooting Table for Synthesizer Table 10-2. Troubleshooting Table for Synthesizer Symptom Possible Causes Procedure Corrective Action Synthesizer Out of 1. VCO fault Verify oscillator is working, check RF Check VCO tank components Lock (RX mode level at U251-10 per schematic.

  • Page 97: Troubleshooting Table For Transmitter

    10-4 UHF Troubleshooting Tables: Troubleshooting Table for Transmitter 10.3 Troubleshooting Table for Transmitter Table 10-3. Troubleshooting Table for Transmitter Symptom Possible Causes Procedure Corrective Action No Transmit (no TX 1. PTT switch defective. Verify U401-71 goes low when PTT Replace PTT switch S441. LED indication) is pressed.
  • Page 98 UHF Troubleshooting Tables: Troubleshooting Table for Transmitter 10-5 Table 10-3. Troubleshooting Table for Transmitter (Continued) Symptom Possible Causes Procedure Corrective Action Poor TX range, 1. RF test jack defective Verify continuity of J140 pins 3 and 4 Replace J140. conducted power in RX mode only.

  • Page 99: Troubleshooting Table For Board And Ic Signals

    10-6 UHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals 10.4 Troubleshooting Table for Board and IC Signals Table 10-4. Troubleshooting Table for Board and IC Signals IC Designator Pin Function DC Voltage Comments (Condition) RF input 44.85 MHz 1.20 IFIC RF input decoupling...
  • Page 100 UHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals 10-7 Table 10-4. Troubleshooting Table for Board and IC Signals (Continued) IC Designator Pin Function DC Voltage Comments (Condition) U110 RF input (TX mode) RF Power Amp Vgg (gate bias) 2.65 (typ) (TX mode) (4.25V typ at VHF) 6.59...
  • Page 101 10-8 UHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals Table 10-4. Troubleshooting Table for Board and IC Signals (Continued) IC Designator Pin Function DC Voltage Comments (Condition) U201 Ref osc XTAL2 Freq Synthesizer Ref osc warp output 3.00 Superfilter cap 4.48 Superfilter base (NU)
  • Page 102 UHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals 10-9 Table 10-4. Troubleshooting Table for Board and IC Signals (Continued) IC Designator Pin Function DC Voltage Comments (Condition) U251 Prescaler output 2.26 VCO / Buffer TX switch output (NU) 0.06 Vcc_BUFFERS 3.00...
  • Page 103 10-10 UHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals Table 10-4. Troubleshooting Table for Board and IC Signals (Continued) IC Designator Pin Function DC Voltage Comments (Condition) U401 PB1_ADDR9 3.05 Microprocessor PB2_ADDR10 0.16 3.23 PBO_ADDR8 3.05 PB5_ADDR13 0.13 PG1_XA14 0.20 PG4_XA17...
  • Page 104 UHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals 10-11 Table 10-4. Troubleshooting Table for Board and IC Signals (Continued) IC Designator Pin Function DC Voltage Comments (Condition) U401 PH1_PW2 3.00 Microprocessor PH0_PW1 3.23 Synth chip select XIRQ 3.00 1.48 RX enable 0.01...
  • Page 105 10-12 UHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals Table 10-4. Troubleshooting Table for Board and IC Signals (Continued) IC Designator Pin Function DC Voltage Comments (Condition) U401 PA3_IC4_OC5_OC1 3.00 Microprocessor PA4_OC4_OC1 Squelch detect input PA5_OC3_OC1 Channel activity input PA6_OC2_OC1 PA7_PA1_OC1 VSSR...
  • Page 106 UHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals 10-13 Table 10-4. Troubleshooting Table for Board and IC Signals (Continued) IC Designator Pin Function DC Voltage Comments (Condition) U404 3.17 Flash ROM 0.30 0.22 3.03 3.08 3.06 0.24 3.08 3.05 3.05 0.69...
  • Page 107 10-14 UHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals Table 10-4. Troubleshooting Table for Board and IC Signals (Continued) IC Designator Pin Function DC Voltage Comments (Condition) U451 GCB1 general purpose output ASFIC_CMP GCB0 general purpose output 3.00 BW select (25 kHz mode) Squelch channel activity output To U401-84...
  • Page 108 UHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals 10-15 Table 10-4. Troubleshooting Table for Board and IC Signals (Continued) IC Designator Pin Function DC Voltage Comments (Condition) U480 Unit 1 output 2.48 Dual Opamp Unit 1 (-) input 2.48 Unit 1 (+) input 2.46...
  • Page 109 10-16 UHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals Notes: November 24, 2003 HKLN4216A...

  • Page 110: Chapter 11 Uhf Schematic Diagrams, Overlays, And Parts Lists

    (pF) or microfarads (µF), and inductance values are in nanohenries (nH) or micro- henries (µH). 2. DC voltages are measured from point indicated to chassis ground using a Motorola DC multi- meter or equivalent. If the board has been removed from the chassis, the transmitter module mounting screws may be used for ground connection.
  • Page 111 11-2 UHF Schematic Diagrams, Overlays, and Parts Lists: Introduction Ref. No. Series Circuit Block 301-400 DC Regulation 401-450 Microprocessor 451-550 Audio 7. Circuit Block Interconnection Legend: Name Description USWB+ Unswitched Battery Voltage (always on) 5 volts (regulated) 5 volts in RX mode only 5 volts in TX mode only RESET Low-line reset signal from U320 to uP...

  • Page 112: Six Layer Circuit Board

    11.2 Speaker and Microphone Schematic MATES WITH J470 ON RADIO BOARD MATES WITH J491 ON RADIO BOARD Figure 11-2. Speaker and Microphone Schematic 11.2.1 Speaker and Microphone Parts List Reference Motorola Part Description Designator 5085880L01 Microphone, electret 5085738Z08 Speaker assembly with connector...
  • Page 113 11-4 UHF Schematic Diagrams, Overlays, and Parts Lists: Speaker and Microphone Schematic Notes: November 24, 2003 HKLN4216A...

  • Page 114: Figure 11-3. Uhf (403-440 Mhz) Radio Circuit Block Diagram

    UHF 403-440 MHz PCB 8486635Z03-O Schematic Diagrams, Overlays, and Parts Lists 11-5 Chapter 11 UHF 403-440 MHz PCB 8486635Z03-O Schematic Diagrams, Overlays, and Parts Lists UHF R1 USWB + USWB+ USWB+ USWB TX_EN A TX_ENA PWR_SET TX_UHF_R1 PWR_SET RX_BE RX_FE_UHF_R1 DEMOD DEMOD CONTROLLER...

  • Page 115: Uhf 403-440 Mhz Schematic Diagrams, Overlays, And Parts Lists

    11-6 UHF 403-440 MHz Schematic Diagrams, Overlays, and Parts Lists Chapter 11 UHF 403-440 MHz Schematic Diagrams, Overlays, and Parts Lists FE_5R 5.6K 390pF UMT1 UHF R1 Front End SH40 SHIELD SHIELD 390pF 390pF 18nH 0.1uF 5.6K C523 0.55pF C521 4.2V 5.5% FE_IF_OUT...

  • Page 116: Figure 11-5. Uhf (403-440 Mhz) Receiver Back End Schematic Diagram

    UHF 403-440 MHz PCB 8486635Z03-O Schematic Diagrams, Overlays, and Parts Lists 11-7 RX Back End (Overtone) U52-1 FL53 TC7W04F CFWC455E 0.1uF OUT 2 U52-2 100K TC7W04F IF_BAND_SEL 5V for 25kHz BW_SE L 0V for 12.5kHz 0.1uF FL54 CFWC455G 1 IN 47pF U52-3 3.3K...

  • Page 117: Figure 11-6. Uhf (403-440 Mhz) Pcb 8486635Z03-O Synthesizer Schematic Diagram

    11-8 UHF 403-440 MHz Schematic Diagrams, Overlays, and Parts Lists UHF R1 Synthesizer FN_V_SF 4.5V V_SF SH200 SH201 C231 C232 C233 SHIELD SHIELD R230 R247 LOCK: 3V 1000pF 0.1uF 4.7uF UNLOCK: 0V FN_LOCK LOCK C204 31 NC3 WARP 470pF 29 NC2 INDMULT 17 NC1 SFOUT...

  • Page 118: Figure 11-7. Uhf (403-440 Mhz) Voltage Controlled Oscillator Schematic Diagram

    UHF 403-440 MHz PCB 8486635Z03-O Schematic Diagrams, Overlays, and Parts Lists 11-9 UHF R1 VCO V_SF VCO_VSF L270 R273 R277 4.5V V_SF 220nH C270 C274 C292 C285 VCO_3V 390pF 0.1uF 390pF 0.1uF L272 220nH SH250 SH251 SH253 C272 SHIELD SHIELD SHIELD L292 0.1uF...

  • Page 119: Figure 11-8. Uhf (403-440 Mhz) Pcb 8486635Z03-O Transmitter And Power Control Schematic Diagram

    11-10 UHF 403-440 MHz Schematic Diagrams, Overlays, and Parts Lists UHF R1 Tx PA_USWB+ USWB+ Q171 PA_TX_ENA TX_ENA C170 390pF Q170 EMB10 C525 C172 390pF R120 C157 390pF C154 0.1uF 390pF R152 R121 100K R158 R159 C151 R153 100K U151 390pF 5.1K U150-2...

  • Page 120: Figure 11-9. Uhf (403-440 Mhz) Controller Interconnect Schematic Diagram

    UHF 403-440 MHz PCB 8486635Z03-O Schematic Diagrams, Overlays, and Parts Lists 11-11 Controller SW_B +3 V VS_AUDIO_SEL CNTL_PWR_SET OPT_MI C PWR_SET PWR_SET OPT_TX_AUD_FLAT_RETURN CNTL_DEMO D DEMO D DEMOD OPT_TX_AUD_RETURN CNTL_BW_SEL OPT_TX_AUD_SEN D BW_SEL BW_SEL AUDI O OPT_RX_AUD_SEND_DETECTO R OPT_RX_AUD_SEND_UNMUTED MOD_OUT MOD_OUT CNTL_16_8_MHZ OPT_RX_AUD_RETURN...

  • Page 121: Figure 11-10. Uhf (403-440 Mhz) Pcb 8486635Z03-O Microprocessor Circuitry Schematic Diagram

    11-12 UHF 403-440 MHz Schematic Diagrams, Overlays, and Parts Lists Microprocessor D3_3 V D3_3V C418 R410 R416 R417 D3_3V 0.1uF Q410 C410 C411 C413 C412 TP402 R412 R411 0.1uF 0.1uF 10uF 1000pF 100K SC I TP405 SH400 SH401 C419 SHIELD SHIELD 1000pF R419...

  • Page 122: Figure 11-11. Uhf (403-440 Mhz) Audio Circuitry Schematic Diagram

    UHF 403-440 MHz PCB 8486635Z03-O Schematic Diagrams, Overlays, and Parts Lists 11-13 R516 R523 Audio C512 C514 R522 Q520 6.8pF 16pF IMX1 100K R512 150K R514 5V_A 100K U510-1 LM2904 Q520 IMX1 R511 C518 R513 DEMOD C460 100K R515 VR471 0.1uF OPT_RX_AUD_SEND_DETECTO R R470...

  • Page 123: Figure 11-12. Uhf (403-440 Mhz) Pcb 8486635Z03-O Dc Regulation Schematic Diagram

    11-14 UHF 403-440 MHz Schematic Diagrams, Overlays, and Parts Lists DC Regulation USWB+ U310 TK71750S F301 VR301 J301 MMBZ5250B 1 VIN VOUT 4 CTRL D301 C301 C303 C304 C311 C312 C313 DATA BYPASS 390pF .01uF .018uF .01uF 33uF 10uF Q311 C310 .01uF D3_3V...

  • Page 124: Figure 11-13. Uhf (403-440 Mhz) Keypad Board Schematic Diagram

    UHF 403-440 MHz PCB 8486635Z03-O Schematic Diagrams, Overlays, and Parts Lists 11-15 DISPLAY MODULE KEYPAD MAIN BOARD CONNECTOR CONNECTO R LEDBL J2-9 LEDBL J1-9 LEDBL DATA J2-16 16 J1-8 Vddd J2-1 7 J1-7 LCD_SEL J2-1 0 J1-6 J2-1 J1-5 DATA Vddd Vddd J2-2...

  • Page 125: Figure 11-14. Uhf (403-440 Mhz) Pcb 8486635Z03-O Board Component Side View

    UHF 403-440 MHz PCB 8486635Z03-O Schematic Diagrams, Overlays, and Parts Lists 11-16 D301 C488 C465 R480 C458 C454 C513 S444 C480 J471 R470 R473 R264 U451 R254 FL54 R496 L265 L255 C470 R253 C267 C473 R472 C256 R481 C257 C302 C489 C482 R522...

  • Page 126: Figure 11-15. Uhf (403-440 Mhz) Board Solder Side View

    UHF 403-440 MHz PCB 8486635Z03-O Schematic Diagrams, Overlays, and Parts Lists 11-17 C206 R206 C52 C53 C220 C417 R416 R411 D121 U151 C222 R434 L140 R502 R433 R432 C221 FL51 C122 R150 R501 C223 C157 L141 L132 C224 C132 C159 R151 SH200 R154...

  • Page 127: Figure 11-16. Uhf (403-440 Mhz) Pcb 8486635Z03-O Keypad Board

    11-18 UHF 403-440 MHz Schematic Diagrams, Overlays, and Parts Lists Component Side Solder Side Figure 11-16. UHF (403-440 MHz) PCB 8486635Z03-O Keypad Board December 4, 2003 HKLN4216A...

  • Page 128: Uhf (403-440 Mhz) Radio Parts List

    UHF 403-440 MHz PCB 8486635Z03-O Schematic Diagrams, Overlays, and Parts Lists 11-19 UHF (403-440 MHz) Radio Parts List Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Circuit Motorola Part No. Part No. Part No. Description Part No. 2113743N46 CAP, 68pF...
  • Page 129 11-20 UHF 403-440 MHz PCB 8486635Z03-O Schematic Diagrams, Overlays, and Parts Lists Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. C406 2113743N50 CAP, 150pF C475 2113743L48 CAP, .022uF...
  • Page 130 UHF 403-440 MHz PCB 8486635Z03-O Schematic Diagrams, Overlays, and Parts Lists 11-21 Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. 0662057M43 RES, 51 R206 Not_Placed RES, 100 R421...

  • Page 131: Uhf (403-440 Mhz) Keypad Board Parts List

    VR475 4880140L20 MMBZ5245B 4802245J84 TSS2_44_395MHZ 9186145B02 45B02 Y201* 4880114R06 14R06 Y202 Not_Placed 45J68 * Motorola Depot Servicing only UHF (403-440 MHz) Keypad Board Parts List Circuit Motorola Description Part No. NOTPLACED CAP, 150pF 2113740F55 CAP, 150pF NOTPLACED CAP, 150pF 2113743E20 CAP, 0.1uF...
  • Page 132 UHF 440-470 MHz PCB 84863848Z13-C Schematic Diagrams, Overlays, and Parts Lists 11-23 Chapter 11 UHF 440-470 MHz PCB 84863848Z13-C Schematic Diagrams, Overlays, and Parts Lists UHF R2 USWB+ USWB+ USWB+ USWB+ TX_ENA TX_ENA PWR_SET TX_UHF_R2 PWR_SET DEMOD DEMOD RX_FE_UHF_R2 RX_BE BW_SEL BW_SEL IF_IN...

  • Page 133: Uhf 438-470 Mhz Schematic Diagrams, Overlays, And Parts Lists

    11-24 UHF 438-470 MHz Schematic Diagrams, Overlays, and Parts Lists Chapter 11 UHF 438-470 MHz Schematic Diagrams, Overlays, and Parts Lists FE_5R 5.6K 390pF UHF R2 Front End SH40 SHIELD SHIELD UMT1 390pF 390pF 22nH 5.6K 0.1uF C521 4.2V C523 1.5K FE_IF_OUT 5.1pF...

  • Page 134: Figure 11-19. Uhf (438-470 Mhz) Receiver Back End Schematic Diagram

    UHF 440-470 MHz PCB 84863848Z13-C Schematic Diagrams, Overlays, and Parts Lists 11-25 RX Back End (Overtone) U52-1 FL53 TC7W04F CFWC455E 0.1uF OUT 2 U52-2 100K TC7W04F IF_BAND_SEL 5V for 25kHz BW_SE L 0V for 12.5kHz 0.1uF FL54 CFWC455G 1 IN 47pF U52-3 3.3K...

  • Page 135: Figure 11-20. Uhf (438-470 Mhz) Pcb 8486348Z13-C Synthesizer Schematic Diagram

    11-26 UHF 438-470 MHz Schematic Diagrams, Overlays, and Parts Lists UHF R2 Synthesizer FN_V_SF 4.5V V_SF SH200 SH201 SHIELD SHIELD C232 C233 C231 R230 R247 1000pF 0.1uF 4.7uF FN_LOCK LOCK LOCK: 3V WARP 25 C204 INDMULT 16 UNLOCK: 0V SFOUT 28 470pF ADAPTSW 46 CCOMP...

  • Page 136: Figure 11-21. Uhf (438-470 Mhz) Voltage Controlled Oscillator Schematic Diagram

    UHF 440-470 MHz PCB 84863848Z13-C Schematic Diagrams, Overlays, and Parts Lists 11-27 UHF R2 VCO V_SF VCO_VSF R273 L270 R277 4.5V V_S F 220nH C292 C274 C270 C285 L282 R284 0.1uF 390pF VCO_3V 15nH 390pF 0.1uF L272 220nH SH250 SH251 SH253 SHIELD SHIELD...
  • Page 137 11-28 UHF 438-470 MHz Schematic Diagrams, Overlays, and Parts Lists UHF R2 Tx PA_USWB+ USWB+ PA_TX_EN A TX_ENA C170 390pF Q171 Q170 EMB10 C171 390pF SH100 SHIELD C157 C154 R152 0.1uF 390pF 100K C155 R158 C151 R153 U151 100K 1.5K 390pF C150 0.1uF...
  • Page 138 UHF 440-470 MHz PCB 84863848Z13-C Schematic Diagrams, Overlays, and Parts Lists 11-29 Controller SW_B +3 V VS_AUDIO_SEL CNTL_PWR_SET OPT_MI C PWR_SET PWR_SET OPT_TX_AUD_FLAT_RETURN CNTL_DEMO D DEMO D DEMOD OPT_TX_AUD_RETURN CNTL_BW_SEL OPT_TX_AUD_SEN D BW_SEL AUDI O BW_SEL OPT_RX_AUD_SEND_DETECTO R MOD_OUT MOD_OUT OPT_RX_AUD_SEND_UNMUTED CNTL_16_8_MHZ OPT_RX_AUD_RETURN...

  • Page 139: Figure 11-23. Uhf (438-470 Mhz) Pcb 8486348Z13-C Controller Interconnect Schematic Diagram

    11-30 UHF 438-470 MHz Schematic Diagrams, Overlays, and Parts Lists Microprocessor D3_3 V D3_3V C418 R410 R416 R417 D3_3V 0.1uF Q410 C410 C411 C413 C412 TP402 R412 R411 0.1uF 0.1uF 10uF 1000pF 100K SC I TP405 SH400 SH401 C419 SHIELD SHIELD 1000pF R419...

  • Page 140: Figure 11-24. Uhf (438-470 Mhz) Microprocessor Circuitry Schematic Diagram

    UHF 440-470 MHz PCB 84863848Z13-C Schematic Diagrams, Overlays, and Parts Lists 11-31 R516 R523 Audio C512 C514 R522 Q520 6.8pF 16pF IMX1 100K R512 150K R514 5V_A 100K U510-1 LM2904 Q520 IMX1 R511 C518 R513 DEMOD C460 R515 VR471 100K 0.1uF R470 OPT_RX_AUD_SEND_DETECTO R...

  • Page 141: Figure 11-25. Uhf (438-470 Mhz) Pcb 8486348Z13-C Audio Circuitry Schematic Diagram

    11-32 UHF 438-470 MHz Schematic Diagrams, Overlays, and Parts Lists DC Regulation USWB+ U310 TK71750S VR301 J301 F301 MMBZ5250B 1 VIN VOUT 4 CTRL D301 C303 C304 C312 C301 BYPASS C311 C313 DATA 390pF .01uF .018uF 10uF .01uF 33uF Q311 C310 .01uF D3_3V...

  • Page 142: Figure 11-26. Uhf (438-470 Mhz) Dc Regulation Schematic Diagram

    UHF 440-470 MHz PCB 84863848Z13-C Schematic Diagrams, Overlays, and Parts Lists 11-33 DISPLAY MODULE KEYPAD MAIN BOARD CONNECTOR CONNECTO R LEDBL J1-9 LEDBL J2-9 LEDBL DATA J2-16 16 J1-8 Vddd J2-1 7 J1-7 LCD_SEL J2-1 0 J1-6 J2-1 J1-5 DATA Vddd Vddd J2-2...

  • Page 143: Figure 11-27. Uhf (438-470 Mhz) Pcb 8486348Z13-C Keypad Option Schematic Diagram

    11-34 UHF 438-470 MHz Schematic Diagrams, Overlays, and Parts Lists D301 C488 C465 C458 R480 C454 C513 S444 C480 J471 R470 R473 R264 U451 R254 FL54 R496 L265 L255 C470 R253 C257 C267 C473 R481 C256 C302 R472 C489 C482 R522 L264 F301...

  • Page 144: Figure 11-28. Uhf (438-470 Mhz) Board Component Side View

    UHF 440-470 MHz PCB 84863848Z13-C Schematic Diagrams, Overlays, and Parts Lists 11-35 C124 C121 C206 R206 C52 C53 D121 R416 C220 C417 R411 C136 U151 L121 C222 C123 C134 R434 L140 R502 R433 C122 R432 C135 C221 FL51 R150 R501 C223 L141 L132...

  • Page 145: Figure 11-29. Uhf (438-470 Mhz) Pcb 8486348Z13-C Board Solder Side View

    11-36 UHF 438-470 MHz Schematic Diagrams, Overlays, and Parts Lists Component Side Solder Side Figure 11-29. UHF (438-470 MHz) PCB 8486348Z13-C Board Solder Side View November 24, 2003 HKLN4216A...

  • Page 146: Uhf (438-470 Mhz) Radio Parts List

    UHF 440-470 MHz PCB 84863848Z13-C Schematic Diagrams, Overlays, and Parts Lists 11-37 UHF (438-470 MHz) Radio Parts List Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Circuit Motorola Part No. Part No. Part No. Description Part No. 2113743N46 CAP, 68pF...
  • Page 147 11-38 UHF 440-470 MHz PCB 84863848Z13-C Schematic Diagrams, Overlays, and Parts Lists Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. C400 Not_Placed CAP, .022uF C467 2113743L19 CAP, 1200pF...
  • Page 148 UHF 440-470 MHz PCB 84863848Z13-C Schematic Diagrams, Overlays, and Parts Lists 11-39 Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. 0662057N09 RES, 27K R162 0662057M98 RES, 10K R418...

  • Page 149: Uhf (438-470 Mhz) Keypad Board Parts List

    VR475 4880140L20 MMBZ5245B 4802245J84 TSS2_44_395MHZ 9186145B02 45B02 Y201* 4880114R06 14R06 Y202 Not_Placed 45J68 * Motorola Depot Servicing only UHF (438-470 MHz) Keypad Board Parts List Circuit Motorola Description Part No. NOTPLACED CAP, 150pF 2113740F55 CAP, 150pF NOTPLACED CAP, 150pF 2113743E20 CAP, 0.1uF...

  • Page 150: Figure 11-30. Uhf (465-495 Mhz) Radio Circuit Block Diagram

    UHF 465-495 MHz PCB 8486634Z02 Schematic Diagrams, Overlays, and Parts Lists 11-41 Chapter 11 UHF 465-495 MHz PCB 8486634Z02 Schematic Diagrams, Overlays, and Parts Lists UHF R3 USWB + USWB + USWB+ USWB TX_ENA TX_ENA PWR_SET TX_UHF_R3 PWR_SET DEMOD DEMOD RX_BE RX_FE_UHF_R3 CONTROLLER...

  • Page 151: Figure 11-31. Uhf (465-495 Mhz) Pcb8486634Z02-O Receiver Front End Schematic Diagram

    11-42 UHF 465-495 MHz Schematic Diagrams, Overlays, and Parts Lists Chapter 11 UHF 465-495 MHz Schematic Diagrams, Overlays, and Parts Lists UHF R3 Front End FE_5R 5.6K 390pF SH40 SHIELD SHIELD UMT1 390pF 390pF 22nH 0.1uF 5.6K C521 4.2V C523 3.7% 1.2K 390pF...

  • Page 152: Figure 11-32. Uhf (465-495 Mhz) Receiver Back End Schematic Diagram

    UHF 465-495 MHz PCB 8486634Z02 Schematic Diagrams, Overlays, and Parts Lists 11-43 RX Back End (Overtone) U52-1 FL53 TC7W04F CFWC455E 0.1uF OUT 2 U52-2 100K TC7W04F IF_BAND_SEL 5V for 25kHz BW_SE L 0V for 12.5kHz 0.1uF FL54 CFWC455G 1 IN 47pF U52-3 3.3K...

  • Page 153: Figure 11-33. Uhf (465-495 Mhz) Pcb8486634Z02-O Synthesizer Schematic Diagram

    11-44 UHF 465-495 MHz Schematic Diagrams, Overlays, and Parts Lists UHF R3 Synthesizer FN_V_SF 4.5V V_SF C231 C232 C233 R230 R247 0.1uF 1000pF 4.7uF SH201 SH200 SHIELD SHIELD FN_LOCK LOCK LOCK: 3V C204 31 NC3 UNLOCK: 0V WARP 470pF 29 NC2 INDMULT 17 NC1 SFOUT...

  • Page 154: Figure 11-34. Uhf (465-495 Mhz) Voltage Controlled Oscillator Schematic Diagram

    UHF 465-495 MHz PCB 8486634Z02 Schematic Diagrams, Overlays, and Parts Lists 11-45 UHF R3 VCO V_SF VCO_VSF L270 R273 R277 4.5V V_S F 220nH C274 C292 C270 VCO_3V 390pF 0.1uF 390pF C285 L272 C272 0.1uF 220nH SH250 SH251 SH253 0.1uF SHIELD SHIELD SHIELD...

  • Page 155: Figure 11-35. Uhf (465-495 Mhz) Pcb8486634Z02-O Transmitter And Power Control Schematic Diagram

    11-46 UHF 465-495 MHz Schematic Diagrams, Overlays, and Parts Lists UHF R3 Tx PA_USWB+ USWB+ PA_TX_EN A TX_ENA C170 390pF Q171 Q170 EMB10 SH100 SHIELD C525 390pF C172 R120 C157 C154 390pF 0.1uF 390pF R152 100K 1% R121 C160 R158 C151 R153 U151...

  • Page 156: Figure 11-36. Uhf (465-495 Mhz) Controller Interconnect Schematic Diagram

    UHF 465-495 MHz PCB 8486634Z02 Schematic Diagrams, Overlays, and Parts Lists 11-47 Controller SW_B +3 V VS_AUDIO_SEL CNTL_PWR_SET OPT_MI C PWR_SET PWR_SET OPT_TX_AUD_FLAT_RETURN CNTL_DEMO D DEMO D DEMOD OPT_TX_AUD_RETURN CNTL_BW_SEL OPT_TX_AUD_SEN D BW_SEL BW_SEL AUDI O OPT_RX_AUD_SEND_DETECTO R OPT_RX_AUD_SEND_UNMUTED MOD_OUT MOD_OUT CNTL_16_8_MHZ OPT_RX_AUD_RETURN...

  • Page 157: Figure 11-37. Uhf (465-495 Mhz) Pcb8486634Z02-O Microprocessor Circuitry Schematic Diagram

    11-48 UHF 465-495 MHz Schematic Diagrams, Overlays, and Parts Lists Microprocessor D3_3 V D3_3V C418 R410 R416 R417 D3_3V 0.1uF Q410 C410 C411 C413 C412 TP402 R412 R411 0.1uF 0.1uF 10uF 1000pF 100K SC I TP405 SH400 SH401 C419 SHIELD SHIELD 1000pF R419...

  • Page 158: Figure 11-38. Uhf (465-495 Mhz) Audio Circuitry Schematic Diagram

    UHF 465-495 MHz PCB 8486634Z02 Schematic Diagrams, Overlays, and Parts Lists 11-49 R516 R523 Audio C512 C514 R522 Q520 6.8pF 16pF IMX1 100K R512 150K R514 5V_A 100K U510-1 LM2904 Q520 IMX1 R511 C518 R513 DEMOD C460 R515 VR471 100K 0.1uF R470 OPT_RX_AUD_SEND_DETECTO R...

  • Page 159: Figure 11-39. Uhf (465-495 Mhz) Pcb8486634Z02-O Dc Regulation Schematic Diagram

    11-50 UHF 465-495 MHz Schematic Diagrams, Overlays, and Parts Lists DC Regulation USWB+ U310 TK71750S F301 VR301 J301 MMBZ5250B 1 VIN VOUT 4 CTRL D301 C301 C303 C304 C311 C312 C313 DATA BYPASS 390pF .01uF .018uF .01uF 33uF 10uF Q311 C310 .01uF D3_3V...

  • Page 160: Figure 11-40. Uhf (465-495 Mhz) Keypad Board Schematic Diagram

    UHF 465-495 MHz PCB 8486634Z02 Schematic Diagrams, Overlays, and Parts Lists 11-51 DISPLAY MODULE KEYPAD MAIN BOARD CONNECTOR CONNECTO R LEDBL J2-9 J1-9 LEDBL LEDBL DATA J2-16 16 J1-8 Vddd J2-1 7 J1-7 LCD_SEL J2-1 0 J1-6 J2-1 J1-5 DATA Vddd Vddd J2-2...

  • Page 161: Figure 11-41. Uhf (465-495 Mhz) Pcb8486634Z02-O Board Component Side View

    11-52 UHF 465-495 MHz Schematic Diagrams, Overlays, and Parts Lists D301 C488 C465 R480 C458 C454 C513 S444 C480 J471 R470 R473 R264 U451 R254 FL54 R496 L265 L255 C470 R253 C267 C473 R481 R472 C256 C257 C302 C489 C482 R522 L264 F301...

  • Page 162: Figure 11-42. Uhf (465-495 Mhz) Board Solder Side View

    UHF 465-495 MHz PCB 8486634Z02 Schematic Diagrams, Overlays, and Parts Lists 11-53 C121 C124 C206 R206 C52 C53 C417 R416 C220 D121 C136 U151 R411 C222 L121 C134 R434 C123 R502 R433 C122 R432 C135 C141 C221 FL51 R150 R501 C223 C157 L132...

  • Page 163: Figure 11-43. Uhf (465-495 Mhz) Pcb8486634Z02-O Keypad Board

    11-54 UHF 465-495 MHz Schematic Diagrams, Overlays, and Parts Lists Component Side Solder Side Figure 11-43. UHF (465-495 MHz) PCB8486634Z02-O Keypad Board November 24, 2003 HKLN4216A...

  • Page 164: Uhf (465-495 Mhz) Radio Parts List

    UHF 465-495 MHz PCB 8486634Z02 Schematic Diagrams, Overlays, and Parts Lists 11-55 UHF (465-495 MHz) Radio Parts List Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Circuit Motorola Part No. Part No. Part No. Description Part No. 2113743N46 CAP, 68pF...
  • Page 165 11-56 UHF 465-495 MHz PCB 8486634Z02 Schematic Diagrams, Overlays, and Parts Lists Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. C401 2113743M24 CAP, 0.1uF C470 2113743E20 CAP, 0.1uF...
  • Page 166 UHF 465-495 MHz PCB 8486634Z02 Schematic Diagrams, Overlays, and Parts Lists 11-57 Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. 0662057M92 RES, 5.6K R158 0662057M78 RES, 1.5K R417...

  • Page 167: Uhf (465-495 Mhz) Keypad Board Parts List

    VR475 4880140L20 MMBZ5245B 4802245J84 TSS2_44_395MHZ 9186145B02 45B02 Y201* 4880114R06 14R06 Y202 Not_Placed 45J68 * Motorola Depot Servicing only UHF (465-495 MHz) Keypad Board Parts List Circuit Motorola Description Part No. NOTPLACED CAP, 150pF 2113740F55 CAP, 150pF NOTPLACED CAP, 150pF 2113743E20 CAP, 0.1uF...
  • Page 168 INDEX Antenna Matching Network, UHF 403-440 MHz Theory Of Operation .......7-4 Antenna Matching Network, UHF 438-470 MHz Theory Of Operation .......8-4 Antenna Matching Network, UHF 465-495 MHz Theory Of Operation .......9-4 Antenna Matching Network, VHF 146-174 MHz Theory Of Operation........4-4 Antenna Switch, UHF 403-440 MHz Theory Of Operation..........7-3 Antenna Switch, UHF 438-470 MHz Theory Of Operation..........8-3 Antenna Switch, UHF 465-495 MHz Theory Of Operation..........9-3...
  • Page 169 INDEX Foreword ..........................ii Fractional-N Synthesizer, UHF 403-440 MHz Theory Of Operation ........7-5 Fractional-N Synthesizer, UHF 438-470 MHz Theory Of Operation ........8-5 Fractional-N Synthesizer, UHF 465-495 MHz Theory Of Operation ........9-5 Fractional-N Synthesizer, VHF 146-174 MHz Theory Of Operation ........4-5 Frequency Generation Circuitry, UHF 403-440 MHz Theory Of Operation......7-4 Frequency Generation Circuitry, UHF 438-470 MHz Theory Of Operation......8-4 Frequency Generation Circuitry, UHF 465-495 MHz Theory Of Operation......9-4...
  • Page 170 INDEX Notes For All Schematics and Circuit Boards, UHF ............11-1 Notes For All Schematics and Circuit Boards, VHF 146-174 MHz........6-1 Power Control, UHF 438-470 MHz Theory Of Operation l ..........8-4 Power Control, UHF 403-440 MHz Theory Of Operation............7-4 Power Control, UHF 465-495 MHz Theory Of Operation............9-4 Power Control, VHF 146-174 MHz Theory Of Operation ............4-4 Product Safety and RE Exposure Compliance...............
  • Page 171 INDEX Transmitter Power Amplifier, UHF 403-440 MHz Theory Of Operation ......7-3 Transmitter Power Amplifier, UHF 438-470 MHz Theory Of Operation ......8-3 Transmitter Power Amplifier, UHF 465-495 MHz Theory Of Operation ......9-3 Transmitter, UHF 403-440 MHz Theory Of Operation ............7-3 Transmitter, UHF 438-470 MHz Theory Of Operation ............8-3 Transmitter, UHF 465-495 MHz Theory Of Operation ............9-3 Troubleshooting Tables, UHF....................10-1 Troubleshooting Table for Board and IC Signals, UHF .............10-6...
  • Page 172 INDEX UHF 465-495 MHz Theory Of Operation................9-1 Introduction........................9-1 UHF Receiver........................9-1 Receiver Front End....................9-1 Receiver Back End ....................9-2 UHF Transmitter ......................9-3 Transmitter Power Amplifier ..................9-3 Antenna Switch......................9-3 Harmonic Filter ......................9-3 Antenna Matching Network ..................9-4 Power Control......................9-4 UHF Frequency Generation Circuitry ................9-4 Fractional-N Synthesizer ..................9-5 Voltage Controlled Oscillator (VCO) ................9-6 Keypad ..........................9-7...
  • Page 173 INDEX VHF Transmitter ......................4-3 Transmit Power Amplifier ..................4-3 Antenna Switch .......................4-3 Harmonic Filter ......................4-3 Antenna Matching Network ..................4-4 Power Control......................4-4 VHF Frequency Generation Circuitry ................4-4 Fractional-N Synthesizer ..................4-5 Voltage Controlled Oscillator (VCO)................4-6 Keypad ..........................4-7 VHF 146-174 MHz Troubleshooting Tables ................5-1 Troubleshooting Table for Receiver................5-1 Troubleshooting Table for Synthesizer ................5-3 Troubleshooting Table for Transmitter................5-4...

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