Uhf Band 2 Receiver Front End Schematic Diagram - Motorola GP328 Plus Service Manual

5C-22
R301
R302
100K
100K
C303
C301
4.3pF
8.2pF
RX_IN
CR301 CR302
C302 L301
12pF 11.03nH L302
11.03nH
SH301 SH302
SHIELD SHIELD
1 1
RXFE Top Shield RXFE Bottom Shield
SH304
SHIELD
1
RX Mixer Diode Shield

UHF Band 2 Receiver Front End Schematic Diagram

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