Figure 9-33. Uhf (403-470 Mhz) Voltage Controlled Oscillator Schematic Diagram - Motorola HT Series Detailed Service Manual

UHF Band 1 Circuit Board/Schematic Diagrams and Parts List (PCB 8480450Z13 / 8480587Z05)
C281
R245
100pF
240
L281 L273
390nH 33nH
C272
NU
L271
68nH
RX_INJ
TX_INJ
C271
NU
SH241
SHIELD
VCO TOP SHIELD VCO BOTTOM SHIELD
5V
AUX3
C297
.01uF
VSF
C276 C286
2.2uF 0.1uF
C273
0.1uF
18 14
10
TX_OUT TX_IADJ
8
RX_OUT RX_IADJ
SUPER_FLTR
12
PRESC PRESC_OUT COLL_RFIN
U241
RX_BASE
7
RX_SW
RX_SWITCH RX_EMITTER
13
TX_SWITCH TX_BASE
TX_SW
TX_EMITTER
FLIP_IN
TRB_IN
17 11 9
SH242
SHIELD
Q261
4
R260
Q260
1K
3 4
2
1
R242
200
C285
100pF
C246
100pF
R244
12K
1
2
3
2
4
Q241
5
1
6
16
3
L282
15
390nH
20
19
R253
7.5K
Tx_sw
R254
7.5K
C289
C254
100pF
3.6pF
3
C255
L253
100pF
2 RESONATOR
AUX4
R252 R251
1
2
18
330
P2
C250
7.5pF
L243
RESONATOR
3
R241
18
C242
7.5pF
2
C243
1
C245
7.5pF
2.4pF
CR243
C244
R243
2pF
10K
Rx_sw
VSF
CR241
3
R248
30
C247
C248 1
100pF
0.1uF
C252
L251
10pF
33nH
C251
C253 CR251
1.5pF 100pF

Figure 9-33. UHF (403-470 MHz) Voltage Controlled Oscillator Schematic Diagram

9-41
L242
220nH
CR242
L241
390nH
VCTRL
C241
100pF
2
FL0830745O