Motorola MDH65SDC9AA2AN Service Information - Page 41
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UHF3 PCB 8486634Z02-O Schematic Diagrams
V_SF
VCO_VSF
4.5V
V_S F
SH250
SH251
SHIELD
SHIELD
1
1
L252
27nH
VCO_V_STEER
L251
R
220nH
V_STEE
3.2V to 9.5V
C251
C252
150pF
NU
L262
27nH
VCO_MOD
VCO_MOD
L270
220nH
C270
390pF
L272
220nH
SH253
SHIELD
1
C271
R274
33
390pF
C255
C253
1.6%
1.1%
D251
6.2pF
9.1pF
C254
C256
L254
12.5nH
3.9pF
3.3pF
2%
R253
2.5%
3.0%
47
C257
12pF
1%
C265
C263
1.6%
5.6pF
6.2pF
C264
L264
1.8%
D261
C266
8nH
3.0pF
2%
3.3%
3.0pF
C268
V_SF
3.3%
0.5pF
20%
C267
R262
7.5K
9.1pF
R261
1.1%
22K
D262
1SV229
UHF R3 VCO
R273
330
C274
VCO_3V
3V
0.1uF
C272
0.1uF
C273
R272
R271
6.2K
5.1K
.01uF
L271
NU
1
TX_IADJ
2
RX_IADJ
3
SUPER_FLTR
U251
4
COLL_RFIN
4
50U5
5
RX_BASE
6
RX_EMITTER
16
TX_BASE
15
TX_EMITTER
20
FLIP_IN
19 TRB_IN
R254
100
L255
220nH
R263
33
R264
100
L265
220nH
RX: 0V
TX: 3V
VCO_TRB
R275
TRB
100
C275
390pF
R277
0
C292
390pF
C285
0.1uF
L282
18nH
L292
R284
15nH
NU
10
TX_OU T
RX_OUT 8
7
NC
RX_SWITCH
13
TX_SWITCH
NC
12
VCO_5R
L281
PRESC_OUT
5R
18nH
C284
R281
8.2K
390pF
C286
R285
0
3.9pF
2.5%
L283
NU
V_SF
VCO_PRESC
R276
L276
PRESC
27nH
NU
C276
3.6pF
2.8%
UHF3 (465-495 MHz) Voltage Controlled Oscillator Schematic
4-9
C290
VCO_TX_INJ
TX_IN J
1.5%
6.8pF
C291
L291
6.8nH
13pF
1%
C282
C281
4.3pF
R282
VCO_RX_IN J
RX_IN J
2.3%
910
390pF
3
1
Q280
2
BFS540
C283
R280
R283
4.7K
130
390pF