Motorola PRO3150 Manual De Servicio página 190

4-138
R301
R302
100K
100K
C301 C303
13pF
4.3pF
RX_IN
CR301 CR302
L301 L302
C302
12pF 11.03nH 11.03nH
SH301 SH302
SHIELD SHIELD
1 1
RXFE Bottom Shield
RXFE Top Shield
SH304
SHIELD
1
RX Mixer Diode Shield
Figura 4-82. Diagrama esquemático de la etapa de entrada del receptor de rango 2 de UHF (450-527 MHz) (tarjeta de circuito impreso nº 8485755Z03)
R305
470
R304
12K
L304
180nH
C309
C308 100pF
100pF
C310
0.1uF
[email protected]
[email protected]
R303
4.3K
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
DACRx
R5
R342
100K
C314 C315
0.1uF 100pF
C380
.01uF
C321
C306
100pF
2pF
R306
100K
C312
C316
L305
4.3pF
4.3pF
12nH
CR304
[email protected]
[email protected]
C311 C313 L306
NU 11pF 11.03nH
CR308
HSMP3820
R347
R317
1
1K
1K
3
2
C331
100pF
4.398V
C396
R336
NU
NU
R5
R316
91K
C333
Q315
NU 3
1
0.508V
2 R318
18K
1
R319
150
R327
33K
3
2
1
2
Q316
NU
R326
NU
[email protected]
[email protected]
T301
XFMR
6
R307
100K
C318
R329
7.5pF
0
4
CR305
L307
C317 C381
11.03nH
11pF 4.7pF
[email protected]
[email protected]
TP302
R5
R339
0
R332
NU
C386
100pF
C370
100pF 1
RX_INJ
R300
2.2K
RSSI
R330 C371
C397 NU
NU
1uF
1.850V@-50dBm
RT300
33.0K
R335
R338 NU
NU
R5
2 1
VR300
NU
RT301
R325 C391 NU
6.8K
NU
R334
NU
C322
82pF
[email protected]
L310
150nH
R308
R310
47
270
R309
0
IF
CR306
4 3
1
2
2 1
3
1 2 3
T302
XFMR
6 4
R348 L309
3.6K 16.28nH
C320 C375
C319
7.5pF 3.6pF 100pF
L321 R333
C374
VCOBUF
NU NU
100pF
R349
0
3 C373
C378
NU
NU
Q310
NU
2
C372
R331
NU
NU
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