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5-1.
BLOCK DIAGRAM – BASE UNIT Section –
1st MIXER, VCO, PLL SYNTHESIZER
IC302
FT1
MIX
MIX
10.555MHz
IN
OUT
RF AMP
1st
24
13
Q301
MIXER
ANT1
(ANTENNA)
LOCAL OSC
BUFFER
B.P.F.
FT301
RT301
RXE
20
VCO
TX B+
TX
RXB
(RX SYSTEM)
POWER
21
TX B+
TX AMP
SWITCH
Q306, 307
Q302
LOCK
14
TX
TXE
5
OUT
2 DOUBLER
VCO
2
TXB
TX AMP
(TX SYSTEM)
4
• SIGNAL PATH
: RX
: TX
: BELL
05
SECTION 5
DIAGRAMS
2nd MIXER, LIMITER AMP, DET,
AF AMP, SQUELCH CONTROL
IC3
MIX
MIX
FT2
LIM
IN
2nd
OUT
455kHz
IN
IF AMP
LIMITER
16
3
5
MIXER
Q1
LOCAL
OSC
SQUELCH
TRIGGER
WITH
HYSTERESIS
1
2
X2
10.1MHz
CT1
TX
FREQUENCY
PROGRAM-
PD2
RX VCO
L.P.F.
18
MABLE
PHASE
Q312
DIVIDER
DETECTOR
D303
LATCH
LOCK
DETECTOR
PROGRAM-
MABLE
PHASE
PD1
TX
DIVIDER
DETECTOR
7
L.P.F.
VCO
LATCH
D302
1/2
PROGRAM-
MABLE
DIVIDER
LATCH
L3
B+ (+3V)
DISCRI
VOLTAGE
RT2
8
TEL
QUAD COIL
OUT LEVEL
AF
OUT
DE-
AF
PREAMP
9
AMP
MODULATOR
AMP
Q2
FIL
FIL
SQ IN
OUT
IN
FILTER
12
11
10
AMP
RT1
SQ
SENSITIVITY
RT3
MODULATION
COMP
SENSITIVITY
OUT
LIMITER
20
13
39
47 48
1/32, 1/33
SYSTEM CONTROLLER
PRESCALER
IC5
TX MUTE
37
RX MUTE 36
DATA IN 38
DTMF
1
DTMF 34
TALK 13
1/16, 1/17
PRESCALER
21
BELL IN
XIN
9
OSC &
LED CHG1
32
XOUT
1/2 DIVIDER
10
31
LED CHG2
SI
LED INUSE1
30
SHIFT
16
41
PLL DATA
REGISTER &
CPS
LED INUSE2
29
15
40
PLL CLK
LATCH
PULSE
17
42
PLL EN
COUNTER
RST
BATT OFF
18
RESET
2
S1
HANDSET
20
PAGE
LOCATOR
S2
PULSE
TX B
46
22 TONE/PULSE
DIAL MODE
TONE
CHG OUT 25
1
24 FLASH 100
S3
FLASH
23 FLASH 270
2
CHG IN 35
3
5
6
X1
3.579545MHz
17
17
EXPANDER, COMPRESSOR, LIMITER
IC1
EXPANDER
EXP
TEL
LPF2
IN
OUT
IN
SUM
+
3
VCA
MUTE
6
19
AMP
LPF1
FSK
IN
OUT
DATA
1
L.P.F.
DRIVE
10
SHAPE
COMPRESSOR
PRE
IN
SUM
PRE
MUTE
24
VCA
AMP
AMP
17
16
HOOK ON/OFF
RELAY DRIVE
Q10
RINGER DETECT
IC4
D6
CHARGE
B+ (+3V)
D7
LINE
BATTERY
VOLTAGE DETECT
IC6
RESET SIGNAL
GENERATOR
Q9
B+ (+3V)
B+ SWITCH
TX B+ (+3V)
(FOR TX SYSTEM)
REGULATOR
Q12
CHARGE CONTROL
Q8
CHARGE DETECT
Q6
SPP-904
T1
LINE
TRANSFORMER
LPF2
HYBRID
OUT
L.P.F.
18
AMP
Q3
AF AMP
Q4
J1
LINE
RL1
B+ (+6V)
J2
!
DC IN 9V
+3V
+6V
REGULATOR
Q11
Q7
+
CHARGE
TERMINAL
–
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