Motorola CP160 Detailed Service Manual page 99

VHF PCB 8486342Z13-C Schematic Diagrams
V_SF
VCO_VSF
4.5V
V_S F
SH251 SH253
SH250
SHIELD SHIELD SHIELD
1 1 1
D251
3
L252
560nH
VCO_V_STEER
L251
V_STEER
560nH
3.0V to 8.0V
C251
.01uF
L262
560nH
D261
3
VCO_MOD
R261
VCO_MOD
51K
TX: 3V
VCO_TRB R275
RX: 0V
TRB
0
L270
560nH
C270
1200pF
C271
.01uF
C253 C255
1
16pF 18pF
2
1%
1%
C254
L254
L253
C256
33nH
100nH
3.3pF
2%
10pF
3.0%
1.0%
R253
47
C257
L255
330nH
36pF
1%
1 C263
C265
27pF 15pF
2
1% 1%
C264
L264
L263
47nH
100nH
4.7pF
2%
C268
2.1%
V_SF
2.7pF
3.7%
R262
6.8K
D262
1SV229
VHF R2 VCO
VCO_3V
3V
R270
18
C272
0.1uF
C273
R271 R272
8.2K 9.1K
.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
C258
R254
19
TRB_IN
220
1200pF
C266
C269
R264
10pF
220
1500pF
1.0%
R263
30
C267
L265
330nH
36pF
1%
C275
1200pF
R273
300
C274 C285 C292
0.1uF 0.1uF 1200pF
R284
L282 L292
330
68nH
47nH
10
TX_OU T
8
RX_OUT
7
NC
RX_SWITCH
13
TX_SWITCH NC
12
PRESC_OUT
U251
VCO_5R
L281
4 50 U5
5R
68nH
C284
1200pF
C286
R286
0
11pF
L283
NU
V_SF
R276
1K
C276
5.1pF
VHF (146-174 MHz) Voltage Controlled Oscillator Schematic
4-9
C290 VCO_TX_INJ
TX_INJ
51pF
C291
L291
27nH
36pF
R281
9.1K
C281 C282
VCO_RX_INJ
R282
RX_INJ
750
9.1pF
1200pF 3
1
2
Q280
R280
BFS540
6.8K
C283
R283
180
1200pF
C277 VCO_PRESC
L276
PRESC
100nH
1200pF