Figure 7-31. Vhf (146-174 Mhz) Voltage Controlled Oscillator Schematic Diagram (8486342Z09-A) - Motorola CP150 Service Manual

VHF (146-174 MHz) Schematic Diagrams, Overlays, and Parts Lists (8486342Z09-A)
3.0V to 9.0V
V_STEER
6880309N62-C
V_SF
4.5V
V_SF
L270
560nH
D251
C255
C253
18pF
16pF
1%
1%
L254
33nH
C254
2%
3.3pF
L253
3.0%
L252
100nH
560nH
L251
560nH
C257
36pF
1%
C251
.01uF
L262
560nH
D261
C263
27pF
1%
L264
47nH
2%
C264
L263
4.7pF
100nH 2.1%
C268
2.7pF
3.7%
VCO_MOD
R261
51K
1SV229
SH250 SH251 SH253
SHIELD SHIELD SHIELD
1 1 1
3V
C270
1200pF
R270
18
C272
0.1uF
R272
9.1K
C273 R271
8.2K
.01uF
R274 L271
33 1
NU
C271
TX_IADJ
.01uF 2
RX_IADJ
3
SUPER_FLTR
4
COLL_RFIN
5
RX_BASE
6
U251
RX_EMITTER
16
TX_BASE
15
C256 TX_EMITTER
20
10pF R254 FLIP_IN
19
1.0% 220
TRB_IN
C258
1200pF
R253
47
L255
330nH
C265
15pF
1%
C266
10pF
1.0%
R264
220
C269
V_SF
1500pF
R263
R262 30
6.8K
C267
36pF L265
330nH
1%
D262
RX: 0V
TX: 3V
TRB
R275
0
C275
1200pF

Figure 7-31. VHF (146-174 MHz) Voltage Controlled Oscillator Schematic Diagram (8486342Z09-A)

R273
300
C292
1200pF
C274 C285
0.1uF 0.1uF
L282 R284
L292
47nH
330
68nH
10
TX_OUT
8
RX_OUT
C290
51pF
12
PRESC_OUT
7 286 mV (RF) L291
RX_SWITCH NC
27nH
13
TX_SWITCH NC
L281
68nH
5R
VCO_5R
R281
C284
R282
1200pF 9.1K
C281
750
1200pF
1.89 V (RX)
C286 R286
0
11pF
R280
6.8K
L283
NU
R283
180
V_SF
PRESC
R276 L276 C277
100nH
1K 1200pF
C276
5.1pF
7-25
1220 mV (RF)
TX_INJ
C291
36pF
850 mV (RF)
RX_INJ
C282
3
9.1pF
1
Q280
BFS540
1.35 V (RX)
2
C283
1200pF
June, 2005