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BK Radio
Page 4-1
Section iv
theory of operation
4.1 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 VI of this manual.
4.2 equipment deScription
The BK Radio KNG Series radio comprises the following major sub-assemblies:
4.2.1 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.
4.2.2 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.
4.3 theory of operation
4.3.1 SyStem Board
System board functions include:
• Core Microprocessor
• Voltage Regulators
• Baseband Signal Processor
• Audio Power Amplifiers
core microprocessor
The core microprocessor communicates with the baseband signal processor, the LCD display and the
battery. It controls radio functions such as adjusting the deviation and receiver tuning. An EEPROM
is used to store calibration and tuning data unique to each radio. An internal clock determines the
microprocessor’s operating frequency.
voltage regulators
Several voltage regulators provide power for the circuitry located on the System Board.
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