tti Tech PMR-446, Руководство по обслуживанию, Страница: 32 / 34

1 2 3 4 5 6 7 8
A
B
C
D
8 7 6 5 4 3 2 1
D
C
B
A
LOW-PASS
FILTER
ANTENNA
SWITCHING
FINAL
AMPLIFIER DRIVER DRIVER
PRE- BUFFER
AMP
TX+5V
SWITCHED
7.5V
SAW FILTER
RF
AMP
SAW FILTER
FIRST
MIXER
BAND PASS
FILTER
LOW PASS
FILTER
21.7MHz
4 POLE
CRYSTAL
FILTER
1ST
IF
AMP
CRYSTAL
OSCILLATOR
BUFFER
AMP
TRANSMIT
VCO
RECEIVE
LOOP
FILTER
DC
FILTER
S5V
FREQUENCY
SYNTHESIZER
SERIAL DATA
SERIAL CLOCK
SYNTHESIZER ENABLE
UNLOCK
S5V
21.25MHz
TCXO
LIMITER
AMP
450KHz
CERAMIC
FILTER
NOISE
AMP
SQUELCH
DETECTOR
SQUELCH
TRIGGER
INVERTER
AMP
FM IC
SQUELCH
FILTER
LOW-PASS
FILTER
DE-
EMPHASIS
HI-PASS
FILTER
AUDUIO
AMPLIFIRE
TO
EXTERNAL
SPEAKER
JACK
LOW-PASS
FILTER
TONE
SQUARER
MIC AMP,
PRE-EMPHASIS,
CLIPPER
TX
MODULATION
LOW-PASS
FILTER
COMPOSITE
MODULATION
TO TRANSMIT VCO
TO TCXO
MASTER
DEVIATION
CONTROL
INTERNAL
OR
EXTERNAL
MICROPHONE
LOW-PASS
FILTER
4.19MHz
CLOCK
OSCILLATOR
EEPROM
CHANNEL
SELECTOR
DCS/CTCSS MODULATION
AUDIO B SW
ADJUST
BEEP
MUTE
LED
INDICATOR
TX/BAT LED
(RED)
BUSY LED
(GRN)
INTERNAL OR
EXTERNAL PTT
MONITOR SWITCH
VOX IN
RESET
SWITCH
5V
REG.
BATTERY
SENSE
SWITCHED
+7.5V
EXTERNAL
+7.5V
ON/OFF
SWITCH
+5V
UNLOCK SYNTHESIZER CLOCK SYNTHESIZER DATA SYNTHESIZER ENABLE +5V RX/TX BATTERY SAVER ENABLE SQUELCH MUTE
+7.5V
BATTERY
MICROPROCESSOR
AUDIO
PA SWITCH
AUDIO B SW
SWITCHED
+7.5V
DCS/CTCSS
MODULATION INPUT
SIC(+5V)
INPUT
MODULATION
COMPOSITE
SQL MUTE
VOLUME
CONTROL
APC
SENSE
APC
1
TTI Tech Co., Ltd.
1
E72-00027Z
APR 22, 2003
Title
Size: Number:
Date: File:
Revision:
Sheet of Time:
A2
TX-446 BLOCK DIAGRAM
Drw: Chk: Apr:
Nakamura
SQL LEVEL
MUTE
LPF
AMP
AC/DC
CONVERT
VOX LEVEL OUT
ADJUST
AC/DC
CONVERT
SQL LEVEL
CTCSS
DEVIATION
CONTROL
DCS
BALANCE
CONTROL
RX5V
S5V
R5 REG
T5 REG
RX/TX
S5
CONT
S5C S5V
R5V
T5V
SECTION 8 BLOCK DIAGRAM
31