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6-1.
BLOCK DIAGRAM – BASE UNIT Section –
MIX, IF AMP, LIMITER AMP,
PLL, EXPANDER/COMPRESSOR
IC101
IC101 (1/2)
RX FREQUENCY:
49.67 – 49.99MHz
MIX1
MIX1
ANT1
OUT
RF AMP
B.P.F.
IN1
B.P.F.
40
TELESCOPIC
Q1
BPF2
BPF1
ANTENNA
1ST
MIX
LO OUT
43
RX
L101
VCO
(RX VCO)
RX VT
LO IN
44
CONTR
42
PD OUT
RX
46
PLL
RX SYSTEM B+
41
VCC2
L52
(TX VCO)
TX VT
D51
MODULATOR
B.P.F.
TX AMP
TX VCO
BPF51
Q51
Q52
05
SECTION 6
DIAGRAMS
FL101
(DET)
RX LEVEL
28
CF102
MIX2
CF101
MIX2
IF
10.68MHz
OUT
460kHz
IN
IN
IF
QUADRATURE
38
36
34
32
AMP
DETECTOR
2ND
MIX
CARRIER
RSSI
DETECTOR
LO1
3
LOCAL
LO2
OSCILLATOR
4
X101
10.22MHz
COMP
FIL OUT
FIL IN
OUT
TX
TX
9
10
11
SPLATTER
MUTE
PD
OUT
TX
47
PLL
TVCOIN
1
X501
4.048MHz
9
10
7
16
17
SW302
S301
DIAL MODE
PAGE
T
P
– 19 –
IC101 (2/2)
AF
PRE
PREAMP
OUT
IN
27
15
EXPANDER
COMP
L.P.F.
IN
DATA
24
COMP
SIG
OUT
5
CPU
INTERFACE
RSSI
H/L
22
23
7
6
8
RV101
RSSI (H)
SENSITIVITY
MIC
IN
COMPRESSOR/
14
LIMITER
MIC AMP
19 5
6
4
2 3 1
SYSTEM CONTROLLER
IC501
18
22
12
AMP
AMP
EXP
OUT
IN
19
RX
OUT
+
RECEIVER
17
18
MUTE
AMP
20
AMP
OUT
T201
LINE TRANSFORMER
TEL AMP
Q202
D101
SIDE TONE
+
CANCEL
21
14
RESET
VOLTAGE
SWITCH
DETECT
Q302
IC301
B+
REGULATOR
REGULATOR
B+ SWITCH
TX SYSTEM B+
Q54
Q301
CHARGE
REGULATOR
Q402
D401
POWER
CHARGE/IN USE
CHARGE DETECT
Q401
– 20 –
SPP-68
• SIGNAL PATH
: RX
: TX
: BELL
MJ201
LINE
D205
RECT
LINE TX
DRIVE
Q203
HOOK ON/OFF
SWITCH
PH202
HOOK ON/OFF
RINGER
SWITCH CONTROL
DETECT
Q201
PH201
20
30
J301
DC IN 9V
–
+
Q601
+
CURRENT
CHARGE
LIMITER
TERMINAL
Q403
–
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