Motorola CP040 - Page 195

VHF2 PCB 8486769Z04-C/Z05-D Schematic Diagrams 3-27
3.0V to 8.0V
4.5V
RX: 0V
TX: 3V
206 mV (RF)
850 mV (RF)
1200 mV (RF)
1.35 V (Rx)
1.89 V (Rx)
0.1uF0.1uF
C285
L281
C274
2%
33nH
68nH
4.7pF
2.1%
C264
L254
10pF
1.0%
C256
750
VCO_VSF
R282
R270
L252
560nH
18
NU
VCO_MOD
L283
C282
C266
1.0%
10pF
9.1pF
47
R253
C286
11pF
L265
330nH
1SV229
D262
330
R284
C268
3.7%
2.7pF
C273
.01uF
C276
5.1pF
R272
9.1K
VCO_TX_INJ
3.3pF
3.0%
C254
180
R283
C290
1200pF
C275
51pF
1
3
2
L264
2%
47nH
BFS540
Q280
560nH
30
R263
L262
D251
C272
0.1uF
19
TRB_IN
TX_BASE
16
TX_EMITTER
15
TX_IADJ
1
TX_OUT
10
TX_SWITCH
13
VCC_BUFFERS
14
VCC_LOGIC
1817
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
C267
1%
36pF
C283
V_SF
C284
1200pF
33
R274
1200pF
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
VCO_PRESC
560nH
L251
NC
C270
VCO_RX_INJ
1200pF
51K
VCO_3V
R261
C258
V_SF
VCO_V_STEER
1200pF
1200pF
1200pF
C292
C281
R264
L292
220
68nH
C277
1200pF
R280
6.8K
16pF
1%
C253
300
R273
R275
0
SHIELD
SH253
1
D261
L271
NU
220
R254
560nH
L270
330nH
L255
0
R286
L291
27nH
27pF
1%
C263
C251
8.2K
.01uF
R276
R271
NC
1K
L253
100nH
R281
9.1K
36pF
C291
SH251
SHIELD
1
R262
V_SF
V_STEER
PRESC
6.8K
VCO_MOD
5R
TX_INJ
RX_INJ
3V
TRB
VHF2 (146-174MHz) Voltage Controlled Oscillator Schematic PCB No. 8486769Z04-C/Z05-D