User Manual

CIRCUIT DESCRIPTION
4-2
June 1997
Part No. 001-3412-002
Figure 4-1 TRANSCEIVER BLOCK DIAGRAM
Z201
RF AMP
Z202
MIXER
CRYSTAL FILTER
PREDRIVER
ANTENNA
SWITCH
RX AUDIO
VCO
AMPLIFIER
T/R PS
SYNTHESIZER
VCO
BUFFER/
RSSI
LOW-PASS
FILTER
RF OUT
RF BPF RF BPF
U221
Z221/Z222
52.95 MHz
IF / 450 kHz FILTER
Q401
2nd LO TRIPLER/AMP
1st LO AMP
CLV
Q853
Q851/Q852
AMPLIFIER
RSSI
RX OUT
TX IN
Y801
TCXO
MOD INPUT
MOD ADJUST
SYNTH OUT
RF IN
U811
BUFFER
U241
Q301
IF AMP
Q850
U521
TRANSMITTER
RECEIVER
+13.3V
+4.6V
U581B
U581A
PWR SET
DIAG
DIAG EN
MOD ADJ
DIAG
DIAG EN
TX EN
+9V TX
RX EN
+13.3V
SWITCHED
CLOCK
DATA
ENABLE
LOCK
Q122
Q121
Q801
TEST
-2.0V
Q171
Q841, Q842
Q901, Q902
Q501
Q701
Q123
+5V DC
SHUTDOWN
Q511
Q531/U111C
CR561/562
V FWD
V REV
U913C
U913A
U912
U261
Q131/U131
U141
+9.6V
+5.5V
Q231Q211Q201/Q202
Q101/Q102
U111A/B/D
Q124
U911
RSSI
RX OUT
TX EN
CLOCK
DATA
Q172
Q173
+9.6V
RECEIVE