User Manual

CIRCUIT DESCRIPTION
4-3
Part No. 001-3422-003
Figure 4-1 Transceiver Block Diagram
RF AMP
MIXER
CRYSTAL FILTER
PREDRIVER
ANTENNA
SWITCH
RX AUDIO
VCO
T/R PS
SYNTHESIZER
VCO
RSSI
LOW-PASS
FILTER
RF OUT
RF BPF
RF BPF
IF / 450 kHz FILTER
1st LO AMP
CLV
BUFFER/AMPLIFIER
RSSI
RX OUT
TX IN
Y801
TCXO
MOD INPUT
MOD ADJUST
SYNTH OUT
RF IN
U241
TRANSMITTER
RECEIVER
+13.6V
+4.6V
U581A
U581B
PWR SET
DIAG
DIAG EN
MOD ADJ
DIAG
DIAG EN
TX EN
+9V TX
RX EN
+13.6V
SWITCHED
CLOCK
DATA
ENABLE
LOCK
Q122
Q121
Q801
TEST
-2.0V
Q501
Q123
+5V DC
SHUTDOWN
Q511
Q531/U111C
CR561/562
V FWD
V REV
U913C
U911
U912
Q131/U131
U141
+9.6V
+5.5V
Q201/Q202
U531
Q301/Q302
Q231/Q232
21.45 MHz
Z231/Z232
Q251
Q101/Q102
U111A/B/D
Q124
Q871/Q872 Q881/Q882
Q171, Q172, Q173
Q173, Q841
Q842, Q901
AUX IN
U811
Q701
CR281/CR282
CR281/CR282
CR251
PHP
PHA
U801
CLOCK
DATA
U913A
U831B
U913B