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WCS-880
SECTION 4
DIAGRAMS
4-1.
BLOCK DIAGRAM – TX Section –
PRE-EMPHASIS
J1
& COMPRESSOR
MIC
IC1
RV1 – 3
TX MODULATION
SENSITIVITY
RV3
RV2
RV1
SW51
CH-3
CH-2
CH-1
RF
CHANNEL
SW51 – 1
1
2
3
X51
12.8MHz
TX OSC
AMP
OSC IN
8
Q50
Q51
CT2
L50
DIV
7 5
• SIGNAL PATH
: TX
PLL
IC51
CHARGE
CRYSTAL
REFERENCE
PHASE
PUMP
INPUT
FREQUENCY
COMPARATOR
BUFFER
DIVIDER
DIGITAL
LOCK
DATA
DETECTOR
SET
OUTPUT
CIRCUIT
COMPARATOR
SELECTOR
FERQUENCY
CIRCUIT
DIVIDER
PRESCALER
CONTROL CIRCUIT
4
D102
BATT
D101
B+
V OUT
2
ERROR
PWM
OUTPUT
AMP
CONTROL
CIRCUIT
VREF
OSC
DC/DC CONVERTER
IC101
10
10
DO
IN
FREQUENCY
2
LPF
Q1
CT1
VCO
CT1
X1
VOLTAGE
970MHz
MULTIVIBRATOR
(FOR MUTING)
Q121, 123
SWITCHING
Q122
LED DRIVE
Q101
SW101
POWER
LINE
L101
FILTER
DRY BATTERY
LF101
SIZE "AA"
ON
(IEC DESIGNATION R6)
1PCS. 1.5V
LX
OFF
3
ANT1
LEAD
ANTENNA
OUT
RF AMP
Q2, 3
RV51
TX OUTPUT
LEVEL
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