Figure 9-38. Uhf (403-470 Mhz) Receiver Front End Schematic Diagram - Motorola HT Series Detailed Service Manual

9-50
R301
R302
100K
100K
C301
C303
3.6pF 3.9pF
RX_IN
CR302
CR301
L301
C302
L302
13.9nH
10pF
13.9nH
SH301 SH302
SHIELD SHIELD
1 1
RXFE Top Shield
RXFE Bottom Shield
SH304
SHIELD
1
RX Mixer Diod Shield

Figure 9-38. UHF (403-470 MHz) Receiver Front End Schematic Diagram

R305
510
R304
12K
L304
180nH
C309
C308
100pF
100pF
C310
0.1uF
R303
1K
C307
C305
Q301
3
0.1uF
20pF
1
3 2
CR303
R328
2.7
C304 L303 R340
2 1
22nH 6.8K
10pF
R5
L340
390nH
SH303
SHIELD C395
100pF
1
Mixer Shield
M300
DACRx
R5
R342
100K
C315
C314
100pF
0.1uF
C380
.01uF
C321
100pF C306
NU
R306
100K
C312
L305
C316
9.1pF
22nH
3.9pF
CR304
C311 C313 L306
NU 10pF 13.9nH
CR308
HSMP3820
R347 R317
1K 1K
1 3
C331
2
100pF
C396
R336
NU
NU
R5 R316
91K
C333
Q315
3
NU
1
2 R318
18K
1
R319
150 R327
33K
3
2
1
2
Q316
NU
R326
R334
NU
NU
UHF Band 1 Circuit Board/Schematic Diagrams and Parts List (PCB 8480450Z14)
C322
82pF
150nH
T301
XFMR
6
R307
C318
100K
R329
7.5pF
0
4
CR305
L307 C317
C381
13.9nH 9.1pF 6.2pF
TP302
R5
R339
0
R332
NU
C386
100pF
C370
1
100pF
RX_INJ
R300
2.2K
RSSI
R330 C371
C397
NU NU
0.47uF
RT300
R335
33.0K
R338
NU
NU
R5
VR300
2 1
NU
RT301
R325 C391
NU
6.8K NU
L310
R308
R310
270
270
R309
18
IF
CR306
4 3
1
2
3 1
2
T302
XFMR
R348 L309
16.28nH
3.6K
C375
C320 C319
100pF
7.5pF 1.8pF
VCOBUF
L321 R333 C374
100pF
NU NU
if
R349
0
3 C378
C373
Q310
NU
NU
NU
2
C372
R331
NU
NU