50u54 – Motorola CP150TM User Manual
Page 111
VHF (146-174 MHz) Schematic Diagrams, Overlays, and Parts Lists (8486342Z13-C)
7-41
6880309N62-C
June, 2005
4.5V
RX: 0V
TX: 3V
206 mV (RF)
850 mV (RF)
1200 mV (RF)
1.35 V (Rx)
1.89 V (Rx)
3.0V to 8.0V
18
R270
VCO_MOD
L252
560nH
NU
C266
1.0%
10pF
L283
9.1pF
C282
47
R253
11pF
L265
330nH
C286
330
R284
1SV229
D262
3.7%
2.7pF
C268
5.1pF
C273
.01uF
9.1K
C276
VCO_TX_INJ
R272
3.3pF
3.0%
C254
180
R283
1200pF
C275
51pF
C290
2
L264
2%
47nH
BFS540
Q280
1
3
30
R263
C285
0.1uF
C274
0.1uF
68nH
L281
1
8
L254
2%
33nH
3
19
TRB_IN
TX_BASE
16
TX_EMITTER
15
TX_IADJ
1
TX_OUT
10
TX_SWITCH
13
VCC_BUFFERS
14
VCC_LOGIC
9
17
GND_LOGIC
PRESC_OUT
12
RX_BASE
5
RX_EMITTER
6
RX_IADJ
2
RX_OUT
8
RX_SWITCH
7
SUPER_FLTR
50U54
U251
COLL_RFIN
4
FLIP_IN
20
GND_BUFFERS
11
GND_FLAG
1500pF
C269
C267
1%
36pF
C283
V_SF
1200pF
C284
1200pF
33
R274
V_SF
C265
C255
1%
18pF
L263
15pF
1%
C271
100nH
1
.01uF
SH250
SHIELD
47nH
L282
C257
100nH
L276
36pF
1%
VCO_TRB
VCO_5R
4.7pF
2.1%
C264
10pF
1.0%
C256
R282
750
C270
VCO_VSF
1200pF
51K
VCO_3V
R261
C258
V_SF
VCO_V_STEER
1200pF
1200pF
1200pF
C292
C281
R264
L292
220
1200pF
68nH
C277
R280
6.8K
16pF
1%
C253
300
R273
R275
0
SHIELD
SH253
1
D261
L262
560nH
C272
0.1uF
D251
R286
0
L291
27nH
27pF
1%
C263
.01uF
C251
R271
8.2K
R276
NC
1K
9.1K
L253
100nH
C291
R281
1
36pF
SH251
SHIELD
L251
6.8K
R262
VCO_PRESC
560nH
VCO_RX_INJ
NC
NU
220
R254
L271
L270
330nH
L255
560nH
V_SF
PRESC
VCO_MOD
5R
TX_INJ
RX_INJ
3V
TRB
Figure 7-43. VHF (146-174 MHz) Voltage Controlled Oscillator Schematic Diagram (8486342Z13-C)