Figure 9-96. 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
C281
R245
100pF
240
L281 L273
390nH 33nH
C272
NU
L271
68nH
RX_INJ
TX_INJ
SH241
SHIELD
VCO TOP SHIELD
5V
AUX3
VSF
C276 C286
2.2uF 0.1uF
C273
0.1uF
18 14
10
TX_OUT
8
RX_OUT
SUPER_FLTR
12
PRESC PRESC_OUT COLL_RFIN
U241
C271
RX_BASE
NU
7
RX_SW
RX_SWITCH RX_EMITTER
13
TX_SWITCH TX_BASE
TX_SW
TX_EMITTER
17 11 9
SH242
SHIELD
Q261
4
VCO BOTTOM SHIELD
R260
Q260
1K
3 4
2
C297
.01uF
1
R242
200
C285
100pF
C246
100pF
R244
12K
1
TX_IADJ
2
RX_IADJ
3
2
4
Q241
5
1
6
16
3
L282
15
390nH
20
FLIP_IN
19
TRB_IN
R253
7.5K
R254
7.5K
C289
C254
100pF
3.6pF
3
C255
100pF
2 RESONATOR
AUX4
R252 R251
1
18
330
C250
7.5pF
L243
RESONATOR
3
R241
18
C242
7.5pF
2
C243
1
C245
7.5pF
2.4pF
C244
R243
2pF
10K
Rx_sw
VSF
R248
30
C247
C248
100pF
0.1uF
Tx_sw
C252
L251
10pF
33nH
C253 CR251
1.5pF
L253
2
P2

Figure 9-96. UHF (403-470 MHz) Voltage Controlled Oscillator Schematic Diagram

9-169
L242
220nH
CR243 CR242
L241
390nH
VCTRL
C241
100pF
CR241
3
1 2
C251
100pF
FL0830745O