Motorola CP160 Detailed Service Manual page 237

UHF3 PCB 8486634Z02-O Schematic Diagrams
V_SF
VCO_VSF
4.5V
V_S F
SH250 SH251
SHIELD SHIELD
1
1
L252
27nH
VCO_V_STEER
L251
R
220nH
V_STEE
3.2V to 9.5V
C251 C252
150pF
NU
L262
27nH
VCO_MOD
VCO_MOD
L270
220nH
C270
390pF
L272
220nH
SH253
SHIELD
1
C271
R274
33
390pF
C255
C253
1.6% 1.1%
D251
6.2pF 9.1pF
C254
C256
L254
12.5nH
3.9pF
3.3pF
2%
R253
2.5%
3.0%
47
C257
12pF
1%
C265
C263
1.6%
5.6pF
6.2pF
C264
L264 1.8%
D261
C266
8nH
3.0pF
2%
3.3% 3.0pF
C268
V_SF 3.3%
0.5pF
20%
C267
R262
7.5K
9.1pF
R261 1.1%
22K
D262
1SV229
UHF R3 VCO
R273
330
C274 VCO_3V
3V
0.1uF
C272
0.1uF
C273
R272
R271
6.2K
5.1K
.01uF
L271
NU
1
TX_IADJ
2
RX_IADJ
3
SUPER_FLTR U251
4
COLL_RFIN
4 50U5
5
RX_BASE
6
RX_EMITTER
16
TX_BASE
15
TX_EMITTER
20
FLIP_IN
19 TRB_IN
R254
100
L255
220nH
R263
33
R264
100
L265
220nH
RX: 0V
TX: 3V
VCO_TRB
R275
TRB
100 C275
390pF
R277
0
C292
390pF
C285
0.1uF
L282
18nH
L292
R284
15nH
NU
10
TX_OU T
RX_OUT 8
7
NC
RX_SWITCH
13
TX_SWITCH NC
12 VCO_5R
L281
PRESC_OUT
5R
18nH
C284
R281
8.2K
390pF
C286
R285
0
3.9pF
2.5%
L283
NU
V_SF
VCO_PRESC
R276 L276
PRESC
27nH
NU
C276
3.6pF
2.8%
UHF3 (465-495 MHz) Voltage Controlled Oscillator Schematic
4-9
C290
VCO_TX_INJ
TX_IN J
1.5%
6.8pF
C291
L291
6.8nH
13pF
1%
C282
C281 4.3pF
R282 VCO_RX_IN J
RX_IN J
2.3%
910
390pF
3
1
Q280 2
BFS540
C283
R280
R283
4.7K
130
390pF