BK Radio GPH-CMD Service Manual

GPH-CMD VHF Radio General Information
Specifications are subject to change without notice.
BK RADIO Page iii
3.14 ALPHANUMERIC DISPLAY....................................................................................................... 3-18
3.14.1 DISPLAY BACKLIGHTING .................................................................................................. 3-19
3.14.2 CHANNEL AND GROUP LABELS ...................................................................................... 3-19
3.15 DEFINITIONS AND ACRONYMS .............................................................................................. 3-20
FIGURE 3-1 LIQUID CRYSTAL DISPLAY......................................................................................... 3-18
SECTION IV
THEORY OF OPERATION
4.1 INTRODUCTION .......................................................................................................................... 4-1
4.2 DESCRIPTION ............................................................................................................................. 4-1
4.3 THEORY OF OPERATION .......................................................................................................... 4-1
4.3.1 RECEIVER............................................................................................................................. 4-1
4.3.2 TRANSMITTER...................................................................................................................... 4-3
4.3.3 SYNTHESIZER ...................................................................................................................... 4-5
4.3.4 SYSTEMS AREA ................................................................................................................... 4-7
4.3.5 DIGITAL SIGNAL PROCESSING.......................................................................................... 4-9
FIGURE 4-1 RECEIVER BLOCK DIAGRAM ....................................................................................... 4-2
FIGURE 4-2 TRANSMITTER BLOCK DIAGRAM................................................................................ 4-3
FIGURE 4-3 POWER AMPLIFIER BLOCK DIAGRAM........................................................................ 4-4
FIGURE 4-4 ANTENNA SWITCH FUNCTIONAL BLOCK DIAGRAM................................................. 4-4
FIGURE 4-5 SYNTHESIZER BLOCK DIAGRAM ................................................................................ 4-5
FIGURE 4-6 DIGITAL SIGNAL PROCESSING BLOCK DIAGRAM .................................................... 4-9
SECTION V
MAINTENANCE
5.1 INTRODUCTION .......................................................................................................................... 5-1
5.2 TEST EQUIPMENT REQUIRED .................................................................................................. 5-1
5.3 OVERHAUL.................................................................................................................................. 5-2
5.3.1 ACCESSORIES ..................................................................................................................... 5-2
5.3.2 CLEANING............................................................................................................................. 5-3
5.3.3 REPAIR.................................................................................................................................. 5-4
5.4 DISASSEMBLY/ASSEMBLY........................................................................................................5-4
5.4.1 BATTERY REMOVAL............................................................................................................ 5-4
5.4.2 UNIT DISASSEMBLY ............................................................................................................ 5-4
5.4.3 ASSEMBLY............................................................................................................................ 5-5
5.5 ALIGNMENT PROCEDURES ...................................................................................................... 5-6
5.5.1 TEST SETUP ......................................................................................................................... 5-6
5.5.2 ALIGNMENT ORDER ............................................................................................................ 5-6
5.6 TROUBLESHOOTING......................................................................................................... 5-15
FIGURE 5-1 TRANSMITTER TEST SETUP...................................................................................... 5-11
FIGURE 5-2 SYSTEMS BOARD ADJUSTMENTS............................................................................ 5-12
FIGURE 5-3 RECEIVER TEST SETUP ............................................................................................. 5-13
FIGURE 5-4 RX/TX BOARD ADJUSTMENTS .................................................................................. 5-14

BK Radio GPH-CMD Specifications

General

Brand	BK Radio
Model	GPH-CMD
Category	Portable Radio
Language	English