EFJohnson 001-9800-001, 001-9800-200, 9800 SERIES, 984X SERIES, 988X SERIES, 989X SERIES Synthesizer, Receiver, Power Amplifier

CIRCUIT DESCRIPTION

3-13 February 2001

Part No. 001-9800-001

Figure 3-4 RF Block Diagram (UHF Models)

Two-Pole

Bandpass Filter Two-Pole

Bandpass Filter 45 MHz Four Pole

Crystal Filter

L200/L201 L204/L206 Z204

RF Amp Mixer

Q201

Q202

Second Mixer/Detector

U201

Tripler

Q207 Z205

450 kHz

Ceramic Filter

Q205/

Q206

Switch/Inverter

14.850 MHz

44.550

MHz

Frequency

Control

Frequency

Control

Frequency

Control

Rx Audio

To Audio/Logic Bd

RSSITo

Audio/Logic Bd

Q801

Module

U806

14.850 MHz

TCXO

Reference

Divider

Main

Divider

Prescaler

Control

64/65

Prescaler

Phase

Detector

Tx Modulation

Tx Audio/Data

Shift Register

U800

VCO Control

VCO

Buffer Amplifier

Q506

Q507

Q508

Q509Q600

Q601

Q504/

Q505 First

Amplifier

Second

Amplifier

Third

Amplifier

Predriver

8VTransmit

Switch

Driver

Final

Antenna

Switch

Directional

Coupler

Harmonic

Filter CR601,

CR603

Balance Adj

U802C

Summing Amp

Level Adjust

U802A

U802B

WB

Data

Tx

Data

Tx

Audio

U803

U804

Battery

Forward

Power

Current

Sense Power

Adj U801

Channel

Programming

Control From

Audio/Logic Bd

Power Amplifier Board Power Control Exciter

SynthesizerPowerAmplifierReceiver

Pin

Shift

Tx Freq

Rx Freq - 45 MHz

Synthesizer IC

Tx Modulation

Rx Freq - 45 MHz

Antenna

Lock

Detect

U802D

Charge

Current

Adjust

Q204

Injection

Amplifier

Q2

Q3

Q4

Q0

Q1

fR

fV

R821

Delayed

Transmit

From A/L Bd

Z206

450 kHz

Ceramic Filters

Z202

WB

NB

Switching

Q512

(470-512 MHz) Q511

(470-512 MHz) Q510

(470-512 MHz) Q509

(470-512 MHz)

UHF SYNTHESIZER DESCRIPTION

Contents

Main SERVICE MANUAL 984XSERIES (UHF) 988 989XSERIES (900 MHZ) 98xx-SERIES FM TWO-WAY RADIO SERVICE MANUAL TABLE OF CONTENTS 1 GENERAL INFORMATION 2 INSTALLATION 3 CIRCUIT DESCRIPTION TABLE OF CONTENTS (CONTD) 4 SERVICING 5 PARTS LIST 6 SCHEMATIC DIAGRAMS AND COMPONENT LAYOUTS LIST OF TABLES LIST OF FIGURES SECTION 1 GENERAL INFORMATION 242 - 9 8 x x -x Page Page UHF 984x SPECIFICATIONS 800 MHz 988x SPECIFICATIONS 900 MHz 989x SPECIFICATIONS SECTION 2 INSTALLATION WAR NI NG Page Page Page Page CAUTION Page Page SECTION 3 CIRCUIT DESCRIPTION Page 3-3 February 2001 Figure 3-1 Power Distribution and Switching POWER DISTRIBUTION (ALL MODELS) Note:Arrows Indicate Signal Flow. Figure 3-2 Power On-Off Control Circuit Interface Board (HighTier Only) Page Page Page Page Figure 3-3 Audio and Data Processing Circuitry Block Diagram AUDIO/LOGIC DESCRIPTION (ALL MODELS) 3-8 February 2001 RECEIVEAUDIO TRANSMITDATA Page Page Page Figure 3-4 RF Block Diagram (UHF Models) UHF SYNTHESIZER DESCRIPTION 3-13 February 2001 Synthesizer Receiver Power Amplifier Switching Page Page Page Page Page Page Page Page Figure 3-7 RF Block Diagram (800/900 MHz Models) 800/900 MHz SYNTHESIZER DESCRIPTION 3-23 February 2001 Synthesizer Receiver Power Amplifier Switching Page Page Page Page Page Page Page Page Page SECTION 4 SERVICING CAUTION Page Page Page Page SECTION 5 PARTS LIST FRONT PANEL ASSEMBLY AND MECHANICAL PARTS FRONT PANEL ASSEMBLY AND MECHANICAL PARTS (CONTD) UHF RF AND PA BOARDS UHF RF AND PA BOARDS Page Page Page Page Page Page Page Page Page Page Page Page Page Page 800/900 MHZ RF AND PA BOARDS 800/900 MHz RF AND PA BOARDS Page Page 800/900 MHz RF AND PA BOARDS (CONTD) Page Page Page AUDIO/LOGIC BOARD (ALL MODELS) AUDIO/LOGIC BOARD Page Page Page Page 9800-SERIES RADIO MOUNTING KIT PART NO. 023-9800-030 9800-SERIES REMOTE MOUNTING KIT PART NO. 023-9800-040 DC POWER CABLE AND HARDWARE KIT PART NO. 023-9800-410 (10 Ft) PART NO. 023-9800-422 (22 Ft) ACCESSORY WIRE KIT PART NO. 023-9750-011 AMPLIFIED DYNAMIC MICROPHONE PART NO. 250-0740-300 FRONT PANEL EXPLODED VIEW FRONT AND TOP MECHANICAL PARTS BOTTOM MECHANICAL PARTS 5-32 5-33 REMOTE CONTROL UNIT MECHANICAL PARTS REMOTE TRANSCEIVER MECHANICAL PARTS TRANSISTOR AND DIODE BASING DIAGRAMS SECTION 6 SCHEMATIC DIAGRAMS AND COMPONENT LAYOUTS TRANSISTORS Part Number Basing Diagram Identification DIODES Page Page 6-4 PA BOARD AUDIO / LOGIC BOARDRF BOARD 7A 8B P1 1 INTERCONNECT SCHEMATIC J3 1 21J2 19 20 S1 2 DISPLAY BOARD TOP VIEW DISPLAY BOARD BOTTOM VIEW 6-6 February 2001 Part No. 001-9800-001 R17 RPI (P.N. 023-9800-000) BOARD LAYOUT A 1 2 3 4 5 6 B RPI (P.N. 023-9800-000) SCHEMATIC A 1 2 3 4 5 6 B Orange Black Red Green Yellow Blue Grey Brown RF BOARD COMPONENT LOCATOR GUIDE (UHF) Page Page RF BOARD COMPONENT LOCATOR GUIDE (800/900 MHZ) Page Comp. Location AUDIO/LOGIC BOARD COMPONENT LOCATOR GUIDE Page Comp. Location 6-15 EXCITER RF BOARD SCHEMATIC (REVISED 430-470 MHZ) PA BOARD SCHEMATIC (25W, 430-470 MHZ) 6.6 NOTES: 1. POWER CONTROL 5 A 1 RF BOARD LAYOUT (430-512 MHZ) 2 3 VCO BOARD LAYOUT (430-512 MHZ) PA BOARD LAYOUT (25W, 430-512 MHZ) 6-18 .4 TX 13.6 RX PA BOARD SCHEMATIC (40W, 430-470 MHZ) PA BOARD LAYOUT (40W, 430-512 MHZ) 6-19 February 2001 6-20 EXCITER RF BOARD SCHEMATIC (UNREVISED 430-470 MHZ) 0.5V RF 5.8 13 .4 5 A B CA Go To Page 6-22 C575 C544 RF BOARD SCHEMATIC (470-512 MHZ) PA BOARD SCHEMATIC (25W, 470-512 MHZ) 6.6 NOTES: 1. POWER CONTROL 5 A 1 RF BOARD LAYOUT (430-512 MHZ) 2 3 800/900 MHz RF Board Schematic C119 PA BOARD LAYOUT (25W, 430-512 MHZ) Q102 VCO BOARD LAYOUT (430-512 MHZ) PA BOARD SCHEMATIC (40W, 470-512 MHZ) .7 TX 0 RX 6-26 February 2001 PA BOARD LAYOUT (40W, 430-512 MHZ) Go To Page 6-27 6-27 EXCITER RF BOARD SCHEMATIC (800/900 MHZ) PA BOARD SCHEMATIC (15W, 800/900 MHZ) NOTES: POWER CONTROL SYNTHESIZER RECEIVER 2 ABC 1 RF BOARD LAYOUT (800 MHZ) 3 4 2 6-29 February 2001 A900 VCO RF BOARD LAYOUT (900 MHZ) 3 VCO BOARD LAYOUT (800/900 MHZ) PA BOARD LAYOUT (15W , 800/900 MHZ) PA BOARD SCHEMATIC (30W, 800/900 MHZ) 6-31 6-32 February 2001 J601 PA BOARD LAYOUT (30W , 800/900 MHZ) U600 Q651 6-33 29 AUDIO/LOGIC BOARD SCHEMATIC 26 97 NOTES: TRANSMIT DATA RECEIVE AUDIO 3 45 AUDIO/LOGIC BOARD LAYOUT C B 3 4 5 A A B