TABLE OF CONTENTS
TABLE OF CONTENTS (CONT’D)
3.10 SYNTHESIZER CIRCUIT DESCRIPTION
(800/900 MHz
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . .
VCO and TCXO Modulation . . . . . . . . . . . . . .
Active Filter (Q800) . . . . . . . . . . . . . . . . . . . . .
Buffer Amplifier (Q801), Tx/Tx Switch
(CR801/CR802) . . . . . . . . . . . . . . . . . . . . . .
Synthesizer Integrated Circuit (U804) . . . . . . .
Lock Detect . . . . . . . . . . . . . . . . . . . . . . . . . . .
Charge Pump . . . . . . . . . . . . . . . . . . . . . . . . . .
Shift Register (U800, U801) and Digital
Potentiometer (U802) Programming . . . . . .
3.11 RECEIVER CIRCUIT DESCRIPTION
(800/900 MHz
Front End Filter . . . . . . . . . . . . . . . . . . . . . . . .
RF Amplifier (Q201) . . . . . . . . . . . . . . . . . . . .
First Mixer (Q202), Crystal Filter (Z204) . . . .
Second Mixer/Detector (U201) . . . . . . . . . . . .
3.12 TRANSMITTER CIRCUIT DESCRIPTION
(800/900 MHz
Predriver (Q506), Driver (Q507) . . . . . . . . . . .
Power Amplifier Module (U600), Final (Q651)
Antenna Switch . . . . . . . . . . . . . . . . . . . . . . . .
Directional Coupler,
Power Control (U500A/B,
4 SERVICING
4.1
4.2 SURFACE MOUNTED DEVICES
4.3 SYNTHESIZER
Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5 TRANSMITTER
4.6 AUDIO/LOGIC BOARD SERVICING. . . . . . .4-5
Digital Circuits . . . . . . . . . . . . . . . . . . . . . . . . . .
Analog Circuits. . . . . . . . . . . . . . . . . . . . . . . . . .
5 PARTS LIST
Front Panel Assembly and Mechanical Parts . . .
UHF RF and PA Boards . . . . . . . . . . . . . . . . . . .
800/900 MHz RF and PA Boards . . . . . . . . . . .
Audio/Logic Board . . . . . . . . . . . . . . . . . . . . . .
DC Power Cable and Hardware Kit . . . . . . . . .
Accessory Wire Kit . . . . . . . . . . . . . . . . . . . . . .
Amplified Dynamic Microphone . . . . . . . . . . .
15 Watt,
Exploded Views
Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . .
Front and Top . . . . . . . . . . . . . . . . . . . . . . . .
Bottom. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Control Unit. . . . . . . . . . . . . . . . . . .
Remote Transceiver . . . . . . . . . . . . . . . . . . .
6SCHEMATIC DIAGRAMS AND COMPONENT LAYOUTS
Amplified Dynamic Microphone . . . . . . . . . . . .
Transceiver Top Photo . . . . . . . . . . . . . . . . . . . .
Transceiver Bottom Photo. . . . . . . . . . . . . . . . . .
Interconnect Schematic. . . . . . . . . . . . . . . . . . .
Interface Board Layout. . . . . . . . . . . . . . . . . . .
Display Board
Top View. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RPI (P.N. 023-9800-000)
Board Layout. . . . . . . . . . . . . . . . . . . . . . . . . .
Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Programming Cable (P.N.
Component Locator Guides
UHF RF Board . . . . . . . . . . . . . . . . . . . . . . . .
800/900 MHz RF Board . . . . . . . . . . . . . . . .
Audio/Logic Board . . . . . . . . . . . . . . . . . . . .
430-470 MHz RF
RF Board Schematic (Revised Board . . . . . .
PA Board Schematic (25W) . . . . . . . . . . . . .
RF Board Layout (Revised Board) . . . . . . . .
VCO Board Layout . . . . . . . . . . . . . . . . . . . .
PA Board Layout (25W) . . . . . . . . . . . . . . . .
PA Board Schematic (40W) . . . . . . . . . . . . .
PA Board Layout (40W) . . . . . . . . . . . . . . . .
RF Board Schematic (Unrevised Board) . . .
RF Board Layout (Unrevised Board) . . . . . .
| February 2001 |
iii | Part No. |