Figure 9-20. Uhf (403-470 Mhz) Receiver Front End Schematic Diagram - Motorola HT Series Detailed Service Manual

9-24
C308
100pF
R301
R302
100K C305
C301 C303 100K
20pF
3.6pF 3.9pF
RX_IN
CR302
CR301
L302 C304
C302 L301
13.9nH 9.1pF
10pF
13.9nH
SH301 SH302
SHIELD SHIELD
RXFE Bottom Shield
RXFE Top Shield
SH304
SHIELD
RX Mixer Diod Shield

Figure 9-20. UHF (403-470 MHz) Receiver Front End Schematic Diagram

R5
C314
R305
0.1uF
510
R304
12K
L304 C321
180nH 100pF
C309
100pF
C310
0.1uF
R303
1K
C307
Q301
3
0.1uF
1
3
CR303 2
R328
2.7
L303 R340
2 1
220nH 6.8K
R5
L340 R347
1K
390nH
SH303
SHIELD C395
100pF
Mixer Shield
R5
DACRx
R342
100K
C315
100pF
C380
.01uF
C306
NU
R306 R307
C312 100K 100K
L305 C316
6.8pF
3.9pF
27nH
CR304
CR305
C311
C313 L306 L307
NU
13.9nH 13.9nH
10pF
CR308
HSMP3820
R317
1
1K
3
2
C331
100pF
C396
R336
NU
NU
R316 R300
91K 2.2K
C333
Q315
NU
3
1
C397
1uF
2 R318
18K
1
R319
150 RT300
R327
33.0K
33K
3
2
1
2
Q316
NU VR300
NU
R325
6.8K
R334
R326
NU NU
UHF Band 1 Circuit Board/Schematic Diagrams and Parts List (PCB 8480450Z03)
C322
82pF
L310
150nH
R308
270
R309
18
T301
XFMR
6 1
C318 2
R329
7.5pF
0
4 3
C381 T302
C317
XFMR
9.1pF
9.1pF
R348
3.6K
TP302
L309
16.28nH
C320
7.5pF
R5
C374
L321 R333
100pF
NU
NU
R339
0
R332
NU
C386
100pF
3
C370
100pF 1 Q310
NU
RX_INJ
2
RSSI
C372
R330 C371 R331
NU
NU NU NU
R335
R338 NU
NU
R5
2 1
RT301
NU
C391
NU
R310
270
IF
CR306
4 3
2 1
1 2 3
6 4
C319 C375
1.8pF 100pF
R349
0
C373 C378
NU NU
FL0830742O