Figure 11-34. Uhf (465-495 Mhz) Voltage Controlled Oscillator Schematic Diagram - Motorola EP450 Service Manual

UHF 465-495 MHz PCB 8486634Z02 Schematic Diagrams, Overlays, and Parts Lists
V_SF
VCO_VSF
4.5V
V_S F
SH250 SH251
SHIELD SHIELD
1
1
L252
27nH
D251
VCO_V_STEER
L251
R
220nH
V_STEE
3.2V to 9.5V
C251 C252
150pF NU
L262
27nH
D261
VCO_MOD
VCO_MOD
HKLN4216A
UHF R3 VCO
L270
220nH
C274
C270
390pF 0.1uF
L272
220nH
SH253
SHIELD
1
C271
R274
L271
33
NU
390pF
C253 C255
1.6% 1.1%
9.1pF
6.2pF
C254
C256
L254
12.5nH
3.9pF
3.3pF
2%
R253
2.5%
3.0%
47
C257
R254
100
12pF
1%
L255
220nH
C263 C265
1.6%
5.6pF
6.2pF
C264
L264 1.8%
C266
8nH
3.0pF
2%
3.3% 3.0pF
C268
V_SF 3.3%
0.5pF R263
20%
C267
R262
7.5K
9.1pF
R261 1.1%
22K
D262
1SV229
RX: 0V
TX: 3V
TRB
R273
330
C292
VCO_3V
3V
390pF
C272
0.1uF
C273
R272
R271
6.2K
5.1K
.01uF
1
TX_IADJ TX_OU T
2 RX_OUT 8
RX_IADJ
3
SUPER_FLTR U251
4
COLL_RFIN
4 50U5
5
RX_BASE
6
RX_EMITTER RX_SWITCH
16
TX_BASE TX_SWITCH
15
TX_EMITTER
20
FLIP_IN
19 TRB_IN
PRESC_OUT
V_SF
33
R276
R264
100
NU
L265
220nH
VCO_TRB
R275
100 C275
390pF

Figure 11-34. UHF (465-495 MHz) Voltage Controlled Oscillator Schematic Diagram

R277
0
C285
0.1uF
L282
18nH
L292
R284
15nH
NU
C290
10
1.5%
6.8pF
L291
6.8nH
7
NC
13
NC
VCO_5R
12 L281
5R
18nH
C284
R281
8.2K
390pF
C281
R282
910
390pF
C286
R285
0
3.9pF Q280
2.5%
BFS540
L283 R280
NU 4.7K
VCO_PRESC
L276
PRESC
27nH
C276
3.6pF
2.8%
11-45
VCO_TX_INJ
TX_IN J
C291
13pF
1%
C282
4.3pF
VCO_RX_IN J
RX_IN J
2.3%
3
1
2
C283
R283
130
390pF
November 24, 2003