Motorola GP344 Detailed Service Manual page 410

3-54
C308
100pF
-51.4dBm@450.125MHz
-51.2dBm@526.925MHz
R301
R302
100K
100K
C303
C301
C305
8.2pF 4.3pF 8.2pF
RX_IN
CR301
CR302
L301
C302
C304
12pF 11.03nH L302
11pF
11.03nH
SH301 SH302
SHIELD SHIELD
1 1
RXFE Top Shield RXFE Bottom Shield
SH304
SHIELD
1
RX Mixer Diode Shield
UHF2 Receiver Front End Schematic Diagram
8485641Z02
R5
C315
R305 C314
100pF
470 0.1uF
R304
12K
C321
L304
100pF
180nH
C309
100pF
C310
0.1uF
R303
1.5K
C307
Q301
3
0.1uF
1
3
CR303 2
R328
2.7
L303 R340
2 1
22nH 8.2K
R5
L340 R347
390nH
1K
SH303
SHIELD C395
100pF
1
Mixer Shield
R336
NU
R5
Rx1 = -50dBm@450.125MHz rf signal
Rx2 = -50dBm@526.925MHz rf signal
probed using high impedence probe
DACRx
R342
100K
C380
.01uF
-51.7dBm@450.125MHz
-52.6dBm@526.925MHz
C306
NU
R306 R307
100K
C312 100K
C316 C318
L305
7.5pF
4.3pF 7.5pF
12nH
CR304 CR305
-51dBm@450.125MHz
-51.2dBm@526.925MHz
L306 L307
C311 C313
C317
11.03nH 11.03nH
11pF
NU 11pF
-24dBm@405.025MHz
-24.9dBm@481.825MHz
CR308
HSMP3820
R317
1
1K
3
2
C331
100pF
4.398V
C396
NU RX_INJ
R300
R316
2.2K
91K
C333
RSSI
NU
Q315
3
1
C397
0.508V
0.47pF
2 R318
1.850V@-50dBm
18K
1
R319
RT300
150
R327
33.0K
33K
R338
3
2
NU
1
2
Q316
NU
VR300
NU
R325 C391
6.8K NU
R326 R334
NU NU
C322
82pF
-63.8dBm@45.1MHz
L310
150nH
R310
R308
270
270
R309
18
CR306
4
T301
XFMR
6 1
2
R329
0
4 3 2
T302
XFMR
C381
4.7pF
R348 L309
3.6K 16.28nH
TP302
C320 C319
7.5pF 3.6pF
R5
L321 R333
C374
NU
NU
100pF
R339
0
R332
R349
NU
0
C386
100pF
3 C373
C370
Q310
NU
100pF 1
NU
2
C372
R330 C371 R331
NU
NU NU
NU
R335
NU
R5
2 1
RT301
NU
UHF2 PCB and Schematic Diagrams
IF
3
1
C375
100pF
VCOBUF
C378
NU