Figure 12-7. Uhf (403-440 Mhz) Voltage Controlled Oscillator Schematic Diagram (8486635Z03-O) - Motorola CP150 Service Manual

UHF (403-440 MHz) Schematic Diagrams, Overlays, and Parts Lists (8486635Z03-O)
V_SF
VCO_VSF
4.5V
V_SF
SH250 SH251 SH253
SHIELD SHIELD SHIELD
1
1 1
L252
27nH
D251
VCO_V_STEER
L251
V_STEER
220nH
3.2V to 9.5V
C251 C252
150pF
NU
0888600M03
L262
27nH
VCO_MOD
VCO_MOD
VCO_TRB
R275
TRB
100
68810309N62-C
UHF R1 VCO
L270
220nH
C270
390pF
L272
220nH
C271
R274 L271
33
NU
390pF
C255
C253
5.6pF
6.2pF 1.8%
C254 C256
1.6% L254
12.5nH
7.5pF 3.6pF
2%
R253
2.8%
1.3%
33
C257
R254
100
10pF
1.0%
L255
220nH
C265
C263 3.3pF
5pF 3.0%
C264
L264
2%
C266
12.5nH
V_SF
3.3pF
D261
2%
3.0% C268 3.3pF
3.0%
0.5pF
R262
20%
6.8K
R261 C267
6.8pF
22K
1.5%
D262
1SV229
RX: 0V
TX: 3V
R273
330
C274
VCO_3V
0.1uF
3V
C272
0.1uF
C273
R271 R272
4.7K 5.6K
.01uF
1 TX_OUT 10
TX_IADJ
RX_OUT 8
2
RX_IADJ
3
SUPER_FLTR
4
COLL_RFIN
5
RX_BASE
6
RX_EMITTER RX_SWITCH
16 TX_SWITCH 13
TX_BASE
15
TX_EMITTER
20
FLIP_IN
19 TRB_IN PRESC_OU T
U251
4 50U5
V_SF
R276
R263
NU
33
R264
100
L265
220nH
C275
390pF

Figure 12-7. UHF (403-440 MHz) Voltage Controlled Oscillator Schematic Diagram (8486635Z03-O)

R277
0
C285
C292
390pF 0.1uF
L292
L282 R284
15nH
330
15nH
C290
6.8pF
L291
6.8nH
7
NC
NC
12
VCO_5R
L281
5R
33nH
C284
R281
8.2K
390pF
C281
R282
910
390pF
C286
R285
1
0
8.2pF
L283 R280
NU 4.7K
L276
27nH
C276
3.9pF
12-9
VCO_TX_INJ
TX_INJ
C291
13pF
C282 VCO_RX_INJ
RX_INJ
3 3.6pF
Q280
BFS540
2
C283
R283
130
390pF
VCO_PRESC
PRESC
June, 2005