Figure 9-96. Uhf Voltage Controlled Oscillator Schematic Diagram - Motorola HT Series Detailed Service Manual

9-122
C281
R245
100pF
240
L281 L273
390nH 33nH
C272
NU
L271
68nH
RX_INJ
TX_INJ
SH241 SH242
SHIELD SHIELD
1 1
VCO TOP SHIELD VCO BOTTOM SHIELD
5V (Rx)
5.05V (Tx)
Q260
3
5V
5.043V (Rx)
3.218V (Tx)
2
AUX3
C297
.01uF
1

Figure 9-96. UHF Voltage Controlled Oscillator Schematic Diagram

VSF
C276
C286
2.2uF 4.567V (Rx)
0.1uF
4.613V (Tx)
C273
0.1uF
18 14
10
TX_OUT TX_IADJ
8
RX_OUT RX_IADJ
SUPER_FLTR
12
PRESC
PRESC_OUT COLL_RFIN
U241
C271
RX_BASE
NU 50U54
7
Rx_sw
RX_SWITCH RX_EMITTER
13
Tx_sw TX_SWITCH TX_BASE
TX_EMITTER
FLIP_IN
TRB_IN
17 11 9
Q261
4
DD
10K
47K
4.7K
R260
47K
1K
4
10K
47K
4.7K 9.55mV (Rx)
5.058V (Tx)
47K
UHF Band 1 Circuit Board/Schematic Diagrams and Parts List (PCB 8415234H01, 8415234H02, 8415234H05, 8415234H08)
R242
200
C285
100pF
C246
100pF
R244
12K
1
2
3
2 Q241
4
BFQ67W
5
1
6
16
3
L282
15
390nH
20
19
4.639V (Rx)
R253
7.5K
9.59mV (Rx)
Tx_sw
4.998V (Tx)
R254
7.5K
C289
C254
100pF
3.6pF
3
C255
100pF
L253
2 RESONATOR
AUX4
R252 R251
1
330 18
C250
7.5pF
L243
RESONATOR
3
R241
18
C242
7.5pF
2
C243
1 7.5pF
C245
2.4pF
C244
R243
2pF
10K
Rx_sw
1.978V (Rx)
CR241
VSF
R248
30
C247 C248
100pF 0.1uF
C252
L251
10pF
33nH
CR251
C253
P1 1
1.8pF
2
P2
P3 3
L242
220nH
CR243 CR242 3.499V (Rx),4.125V (Tx)@403.355MHz
8.798V (Rx),9.216V (Tx)@469.985MHz
L241
390nH
VCTRL
C241
100pF
1 A1 2 A2
C251
100pF