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