Tabla de contenido
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
0.1uF
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 = [email protected] rf signal
Rx2 = [email protected] 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
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
T301
XFMR
6
R307
100K
C318
R329
7.5pF
0
4
CR305
L307
C317
C381
11.03nH
4.7pF
11pF
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
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
Tabla de contenido
Solución de problemas
