Figure 12-19. Uhf (438-470 Mhz) Voltage Controlled Oscillator Schematic Diagram (8486348Z09-A) - Motorola CP150 Service Manual

UHF (438-470 MHz) Schematic Diagrams, Overlays, and Parts Lists (8486348Z09-A)
3.5V to 10V
V_STEER
L251
220nH
C251
NU
6880309N62-C
V_SF
4.5V
V_SF
L270
220nH
C270
390pF
C271
390pF
C253 C255
5.6pF
5.6pF
0.1% 0.1%
L252
27nH
D251
C256
C254 L254 3.9pF
5.1pF 12.5nH
2.5%
2% 2%
C257
12pF
1%
C252
390pF
C263
4.3pF
L262
2.3%
27nH
D261
C268
C264 L264
0.5pF
2pF 12.5nH
20%
5% 2%
V_SF
VCO_MOD
R261
22K
D262
1SV229
SH250 SH251 SH253
SHIELD SHIELD SHIELD
1 1 1
3V
0.1uF
L272
220nH
C272
0.1uF
C273 R271 R272
5.1K 5.6K
.01uF
R274 L271
1
33 NU
TX_IADJ TX_OUT
2
RX_IADJ RX_OUT
3
SUPER_FLTR
4
COLL_RFIN PRESC_OUT
5
RX_BASE
6
U251
RX_EMITTER RX_SWITCH
16
TX_BASE TX_SWITCH
15
TX_EMITTER
20
FLIP_IN
19
TRB_IN
R253
33
R254
100
L255
220nH
C265
3.3pF
3.0%
C266
2.4pF
0.1%
V_SF
R263
33
R262
6.8K
C267
R264
7.5pF
100
1.3%
L265
220nH
RX: 0V
TX: 3V
TRB
R275
100
C275
390pF

Figure 12-19. UHF (438-470 MHz) Voltage Controlled Oscillator Schematic Diagram (8486348Z09-A)

R273
330
R277
0
C292
390pF
C274 C285
0.1uF
L282 R284 L292
15nH
15nH 330
C290
6.8pF
276 mV RF (TX)
10
8
12
7 -6.7 dBm L291 C291
NC
66.3 mV RF (RX) 6.8nH 18pF
13
NC
L281
27nH
5R
C284 R281
8.2K R282
390pF
C281
910
390pF
3
1.64 V (RX) 1
R285
2
C286
0
6.2pF
0.98 V (RX)
R283
R280 150
L283
4.7K
NU
PRESC
R276 L276
27nH
1K
C276
6.8pF
12-25
+11.7 dBm
TX_INJ
4.97 V (RX)
+8 dBm
293 mV RF (RX)
RX_INJ
C282
3.3pF
Q280
BFS540
C283
390pF
June, 2005