Figure 7-43. Vhf (146-174 Mhz) Voltage Controlled Oscillator Schematic Diagram (8486342Z13-C) - Motorola CP150 Service Manual

VHF (146-174 MHz) Schematic Diagrams, Overlays, and Parts Lists (8486342Z13-C)
L252
560nH
L251
VCO_V_STEER
560nH
3.0V to 8.0V
C251
.01uF
L262
560nH
SH250
SHIELD
1
6880309N62-C
V_SF
V_SF
L270
4.5V VCO_VSF
560nH
C270
1200pF
R270
18
R274
33
C271
D251 .01uF
C255
C253
18pF
16pF
1%
1%
L254
33nH
C256
C254
2%
10pF R254
3.3pF
1.0% 220
L253
3.0%
100nH
R253
47
C257 L255
36pF 330nH
1%
D261
C263 C265
27pF 15pF
1% 1%
C266
L264
10pF
47nH
1.0%
2%
C264
L263 4.7pF
100nH 2.1%
V_SF
C268
2.7pF
3.7%
R262
6.8K
C267
36pF
1%
VCO_MOD
VCO_MOD
R261
51K
D262
1SV229
SH251 SH253
SHIELD SHIELD
1 1
R273
300
3V
C274
0.1uF
VCO_3V
C272
0.1uF
R272
9.1K
C273 R271
8.2K
.01uF
L271
NU 1 10
TX_IADJ TX_OUT
2 8
RX_IADJ RX_OUT
3
SUPER_FLTR
4 12
COLL_RFIN PRESC_OUT
5
RX_BASE
6 U251 7
RX_EMITTER RX_SWITCH NC
16 13
TX_BASE TX_SWITCH NC
15
TX_EMITTER
20
FLIP_IN
19
TRB_IN
C258
1200pF
R264
220
C269
1500pF
V_SF
R263
30
R276
1K
L265
330nH
TRB
R275
TX: 3V
VCO_TRB
RX: 0V 0
C275
1200pF

Figure 7-43. VHF (146-174 MHz) Voltage Controlled Oscillator Schematic Diagram (8486342Z13-C)

C292
1200pF
C285
0.1uF
L282 R284
L292
47nH
330
68nH
1200 mV (RF)
C290
VCO_TX_INJ
51pF
206 mV (RF)
C291
L291
36pF
27nH
L281
68nH
5R
VCO_5R
R281
C284
R282
1200pF 9.1K
C281
750
1200pF
C282
3
9.1pF
1.89 V (Rx)
1
Q280
BFS540
C286 R286 2
0
11pF
R280
6.8K
L283
NU
C283
R283
1200pF
180
PRESC
L276
C277 VCO_PRESC
100nH
1200pF
C276
5.1pF
7-41
TX_INJ
850 mV (RF)
RX_INJ
VCO_RX_INJ
1.35 V (Rx)
June, 2005