50u54 – Motorola CP150TM User Manual
Page 95
VHF (146-174 MHz) Schematic Diagrams, Overlays, and Parts Lists (8486342Z09-A)
7-25
6880309N62-C
June, 2005
NU
1200pF
C270
286 mV (RF)
1.89 V (RX)
1.35 V (RX)
850 mV (RF)
1220 mV (RF)
3.0V to 9.0V
RX: 0V
4.5V
TX: 3V
C282
C266
1.0%
10pF
9.1pF
1200pF
C258
C281
1200pF
100nH
L263
.01uF
C276
5.1pF
C273
R272
9.1K
R273
6.8K
R262
0
300
1
3
2
R275
BFS540
Q280
30
R263
L262
560nH
C272
0.1uF
560nH
L270
330nH
L255
0
R286
C267
1%
36pF
27pF
1%
C263
V_SF
1200pF
C283
1200pF
C284
1200pF
C292
220
R264
330
R284
C268
3.7%
2.7pF
SHIELD
SH253
1
D261
NU
220
R254
L271
36pF
1%
C257
VCO_5R
C286
11pF
560nH
L251
1SV229
D262
L291
27nH
51K
L265
330nH
R261
R276
V_SF
NC
1K
R281
9.1K
68nH
L292
.01uF
C251
R271
8.2K
C255
1%
18pF
C254
15pF
1%
C265
R283
3.3pF
3.0%
C275
180
C271
1200pF
.01uF
36pF
C291
100nH
L276
68nH
L281
L254
2%
33nH
4.7pF
2.1%
C264
NC
10pF
1.0%
C256
L253
100nH
L283
C277
1200pF
V_SF
SH251
SHIELD
1
SH250
SHIELD
1
47nH
L282
C285
0.1uF
C274
0.1uF
C253
R280
6.8K
C290
16pF
1%
47nH
51pF
750
L264
2%
33
R274
R282
R270
560nH
18
D251
L252
19
TRB_IN
TX_BASE
16
TX_EMITTER
15
TX_IADJ
1
TX_OUT
10
TX_SWITCH
13
VCC_BUFFERS
14
VCC_LOGIC
18
17
GND_LOGIC
PRESC_OUT
12
RX_BASE
5
RX_EMITTER
6
RX_IADJ
2
RX_OUT
8
RX_SWITCH
7
SUPER_FLTR
3
50U54
U251
COLL_RFIN
4
FLIP_IN
20
GND_BUFFERS
11
GND_FLAG
9
1500pF
C269
47
R253
V_SF
V_STEER
PRESC
VCO_MOD
5R
TX_INJ
RX_INJ
3V
TRB
Figure 7-31. VHF (146-174 MHz) Voltage Controlled Oscillator Schematic Diagram (8486342Z09-A)