Motorola PRO Elite Serie Manual De Servicio página 114

8-4
C308
100pF
R301
R302
100K
100K
C303
C301
4.3pF
8.2pF
X_IN
CR301
CR302
C302 L301
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
Figura 8-4. Diagrama esquemático de la etapa de entrada del receptor de UHF banda 2
R305
470
R304
12K
C321
L304
100pF
180nH
C309
100pF
C310
-51.4dBm@450.125MHz 0.1uF
-51.2dBm@526.925MHz
R303
1.5K
C305 C307
Q301
3
8.2pF 0.1uF
1
3
CR303 2
R328
2.7
L303 R340
2 1
22nH 8.2K
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
C306
NU
R306
C312
100K C316
L305
7.5pF
4.3pF
12nH
CR304
-51dBm@450.125MHz
-51.2dBm@526.925MHz
C311 C313 L306
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
R319
150
R327
33K
3
1
2
Q316
NU
R326
NU
Tarjeta de circuito de UHF banda 2, esquemas eléctricos y lista de partes
C380
.01uF
-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
4.7pF
11pF
-24dBm@405.025MHz
-24.9dBm@481.825MHz
TP302
R5
R339
0
R332
NU
C386
100pF
C370
100pF 1
RX_INJ
R300
2.2K
RSSI
R330 C371
NU NU
C397
0.47pF
1.850V@-50dBm
1
RT300
33.0K
R335
R338 NU
2
NU
R5
2 1
VR300
NU
RT301
R325 C391 NU
6.8K NU
R334
NU
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
VCOB
L321 R333
C374
NU NU
100pF
R349
0
3 C373
C378
Q310
NU
NU
NU
2
C372
R331
NU
NU