SPP-A946/A947
SECTION 5
DIAGRAMS
5-1.
BLOCK DIAGRAM – BASE UNIT Section (1/2) –
– 25 –
– 26 –
QUAD COIL
SCAN
CONTROL
1st
MIXER
2nd
MIXER
LOCAL OSC
BUFFER
LOCAL
OSC
PHASE
DETECTOR
LOCK
DETECTOR
B.P.F.
FT301
RF AMP
Q301
TX AMP
Q306, 307
TX B+
SWITCH
Q302
IF AMP
Q1
TX
VCO
RX VCO
Q312
VCO
(RX SYSTEM)
PREAMP
Q2
LEVEL SHIFT
Q5, 6
MIX
OUT
ANT701
(ANTENNA)
FT1
10.555MHz
MIX
IN
LIM
IN
MIX
OUT
16
5
LIMITER
AMP
SQUELCH
TRIGGER
WITH
HYSTERESIS
AF
AMP
EXPANDER
CIRCUIT
COMPRESSOR
CIRCUIT
FILTER
AMP
DE-
MODULATOR
EPI
CO
CPI
DISCRI
VOLTAGE
L3
TX
FREQUENCY
CT1
TX
POWER
RT301
SQ
SENSITIVITY
RT1
MODULATION
SENSITIVITY
LEVEL SHIFT
Q9
RT3
TEL
OUT LEVEL
RT2
AF
OUT
B+ (3V)
FIL
IN
SQ IN
FIL
OUT
9
EO
(Page 27)
(Page 27)
TX
RX
10
11
5
7
12
8
PD2
PROGRAM-
MABLE
DIVIDER
LATCH
SI
CPS
PLL DATA
PLL CLK
PLL EN
X2
3.583MHz
17
15
16
12
11
10
3
SYSTEM CONTROLLER
IC8 (1/2)
2nd MIXER, LIMITER AMP, DET,
AF AMP, SQUELCH CONTROL
IC3
1st MIXER, VCO, PLL SYNTHESIZER
IC302
EXPANDER, COMPRESSOR
IC1
TX MUTE 16
RX MUTE 15
BELL HI 36
BELL LOW 35
X0
5
X1
6
05
• SIGNAL PATH
: RX
: TX
: BELL
PROGRAM-
MABLE
DIVIDER
PROGRAM-
MABLE
DIVIDER
1/32, 1/33
PRESCALER
L.P.F.
SQ IN
DA
TA
IN
MUTE C
MUTE E
RST
XIN
XOUT
TX B+
(3V)
X1
10.1MHz
D303
D302
OSC
OSC
RXE
RXB
MIX
IN
DA
TA
OUT
DA
TA
EN
41 44
40
2
11
39
10
9
10
18
13
1
2
20
21
13
FT2
455kHz
3
24
PHASE
DETECTOR
VCO
(TX SYSTEM)
2 DOUBLER
TX AMP
PD1
LATCH
1/2
LATCH
1/16, 1/17
PRESCALER
OSC &
1/2 DIVIDER
PULSE
COUNTER
SHIFT
REGISTER &
LATCH
L.P.F.
PREANP
PREAMP
LIMITER
MUTE
MUTE
TXE
TXB
7
TX
OUT
2
5
4
14
LOCK
H
L
OFF
S2
RINGER
A
B
Содержание SPP-A946
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