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BK Radio
Page 3-1
seCtion iii
tHeorY of oPeration
3.1 introDUCtion
This section contains a description of equipment and a theory of operation for the BK Radio KNG
Series APCO Project 25 digital radio. To aid in understanding the operation of the equipment, schematic
diagrams are found in Section 5 of this manual.
3.2 eqUiPment DesCriPtion
The BK Radio KNG Series radio comprises the following major sub-assemblies:
sYstem BoarD
This sub-assembly consists of core microprocessor, voltage regulation, audio power amp and
baseband signal processor. Sheet metal shields are used to shield the digital and regulator sections.
rf BoarD
This sub-assembly consists of the receiver circuitry from the front-end through the digital IF, the
transmitter power amplifier, harmonic filter, antenna switch, power control, synthesizer, and VCO’s.
Sheet metal shields are used to shield the receiver, synthesizer and the VCO’s.
3.3 tHeorY of oPeration
sYstem BoarD
System board functional blocks include:
Core Microprocessor
Power Management Unit
Voltage Regulators
Baseband Signal Processor
Audio Power Amplifiers
Baseband Signal
Processor
Core Microprocessor
Memory
Power Management
Unit
TCXO
19.6608MHz
TCXO
26MHz
Microphone
Power Supply
Clock
USB
Communication
Audio
LCD Display
RF Board Interface
RF Board Interface
Regulated
Voltage Supply
system Board functional diagram
Summary of Contents for KNG Series
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Page 63: ...Page 3 8 Service Manual KNG Portables Theory of Operation ...
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