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Service Manual - KNG Portables
theory of operation
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. The
microprocessor communicates with the EEPROM on the RF board to access the stored calibration and
tuning data that is unique to each radio.
Voltage regulators
Multiple voltage regulators provide power for the circuitry located on the System Board.
Baseband signal Processor
BASEBAND SIGNAL PROCESSOR
TCXO
19.6608 MHz
MIC
DISC
AUDIO
SPEAKER
AUDIO
TX AUDIO
CONTROL /
DATA BUS
TO CORE
µ
P
The Baseband Signal processor implements filters, tone generators and other signal processing
algorithms required for analog and digital modes of operation. A 19.6608MHz TCXO provides a stable
operating frequency reference to the Baseband Signal Processor.
Power management Unit
The Power Management Unit supports the power and clock requirements of the microprocessor. The
device also provides peripheral interfaces including audio, USB communication, microphone, keypad
and display to the microprocessor.
Audio Power Amplifiers
Two Class-D amplifiers provide audio power amplification to drive the internal and external speakers.
Summary of Contents for KNG Series
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