Motorola CP160 Detailed Service Manual page 145

UHF1 PCB 8486635Z03-O Schematic Diagrams
V_SF
VCO_VSF
4.5V
V_SF
SH250 SH251
SH253
SHIELD
SHIELD SHIELD
1
1 1
27nH
VCO_V_STEER
L251
V_STEER
220nH
3.2V to 9.5V
C252
C251
150pF
NU
0888600M03
27nH
VCO_MOD
VCO_MOD
VCO_TRB
R275
TRB
100
L270
220nH
C270
390pF
C271
390pF
C255
C253 5.6pF
L252
6.2pF 1.8%
C254
C256
1.6%
L254
D251
12.5nH
7.5pF 3.6pF
2%
2.8% R253
1.3%
33
C257
10pF
1.0%
C265
C263 3.3pF
L262
5pF 3.0%
C264
L264
2%
12.5nH
V_SF
3.3pF
D261
2%
C268
3.0%
0.5pF
R262
20%
6.8K
R261
22K
D262
1SV229
UHF R1 VCO
VCO_3V
L272
3V
220nH
C272
0.1uF
C273
R272
R271
4.7K 5.6K
.01uF
R274
L271
33
NU
1
TX_IADJ
2
RX_IADJ
3
SUPER_FLTR
4
COLL_RFIN
5
RX_BASE
6
RX_EMITTER
16
TX_BASE
15
TX_EMITTER
20
FLIP_IN
19 TRB_IN
R254
100
L255
220nH
C266
3.3pF
3.0%
R263
33
C267
R264
100
6.8pF
1.5%
L265
220nH
RX: 0V
TX: 3V
C275
390pF
R273 R277
0
330
C274 C292 C285
0.1uF
390pF 0.1uF
L292
L282 R284
15nH
330
15nH
TX_OUT 10
RX_OUT 8
7
RX_SWITCH NC
TX_SWITCH 13
NC
12
PRESC_OU T
VCO_5R
L281
5R
U251
33nH
4 50U5
C284
390pF
C286
R285
0
8.2pF
L283
NU
V_SF
R276
L276
27nH
NU
C276
3.9pF
UHF1 (403-440 MHz) Voltage Controlled Oscillator Schematic
4-9
C290
VCO_TX_INJ
TX_INJ
6.8pF
C291
L291
6.8nH
13pF
R281
8.2K
C282 VCO_RX_INJ
C281
R282
RX_INJ
910
390pF 3 3.6pF
1
Q280
BFS540
2
C283
R280 R283
4.7K 130
390pF
VCO_PRESC
PRESC