TC-700 EX PLUS Service Manual
20
for modulation.
Receive:
MSK input of demodulating IC is sent to AK2346 for demodulation after being
amplified. The demodulated signal is then sent to MCU for decoding.
4) AF
Transmit:
Audio signal from MIC enters baseband processed IC for amplification,
pre-emphasis etc. after being amplified. And then it enters VCO for modulation.
Receive:
Demodulated audio signal enters the baseband processor for amplification,
de-emphasis, etc., after being amplified. And then it enters AF PA driven speaker.
Baseband processed chip provides functions for processing signal as amplifying,
filtering, emphasizing, scrambling, companding, and amplitude limiting.
6
.
Control System
The IC500 CPU operates at 9.8304 MHz.
The block diagram of MCU control system is shown as the following figure:
Fig.6 MCU Block Diagram
Circuit in this section is mainly comprised of MCU, EEPROM etc.
MCU control circuit accomplishes the following functions: accomplish the reset initialization according to
the programmed feature of the radio when power on; detect keying signal and monitor battery voltage;
send necessary frequency data to PLL according to encode of the channel; switch and control
EEPROM
CTCSS/CDCSS
Code
MCU
IC506
E
2
PROM
PTT/RXD RSSI
MONI SQL
FK TONEI
ALRM BATT
T5C T/R
R5C AUXI
APC/TV SAVE
SHIFT AFMUTE
NCON MICMUTE
CTC/CDC Code
PLL IC
Audio Processor
TXD/RXD
Содержание TC-700 Ex PLUS
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