Motorola CP150TM - Manual (Page 207)

UHF (438-470 MHz) Schematic Diagrams, Overlays, and Parts Lists (8486348Z09-A) 12-25
6880309N62-C June, 2005
1.64 V (RX)
0.98 V (RX)
4.97 V (RX)
293 mV RF (RX)
+8 dBm
276 mV RF (TX)
+11.7 dBm
66.3 mV RF (RX)
-6.7 dBm
2.5%
3.9pF
R280
4.7K
C285
0.1uF
C268
20%
NC
R282
C251
1K
TX: 3V
3.5V to 10V
4.5V
RX: 0V
390pF
C292
220nH
L270
L254
2%
12.5nH
L264
2%
12.5nH
390pF
C275
V_SF
C265
3.0%
3.3pF
NC
390pF
C283
1SV229
D262
220nH
L255
R261
22K
19
TRB_IN
TX_BASE
16
TX_EMITTER
15
TX_IADJ
1
TX_OUT
10
TX_SWITCH
13
VCC_BUFFERS
14
VCC_LOGIC
18
17
GND_LOGIC
PRESC_OUT
12
RX_BASE
5
RX_EMITTER
6
RX_IADJ
2
RX_OUT
8
RX_SWITCH
7
SUPER_FLTR
3
50U54
U251
COLL_RFIN
4
FLIP_IN
20
GND_BUFFERS
11
GND_FLAG
9
L251
220nH
L283
NU
.01uF
C254
2%
5.1pF
C273
C255
0.1%
5.6pF
33
R263
C257
12pF
1%
SH251
SHIELD
1
390pF
C270
0.1%
2.4pF
C266
V_SF
220nH
L265
33
R253
100
R264
C252
390pF
33
R274
L252
27nH
C253
0.1%
5.6pF
R262
6.8K
390pF
C284
D261
C264
5%
2pF
C263
2.3%
4.3pF
R275
100
330
R273
1
3
2 R285
0
BFS540
Q280
D251
5.1K
R271
C281
390pF
C286
6.2pF
100
R254
6.8pF
C282
C276
3.3pF
C290
6.8pF
C271
18pF
C291
390pF NU
L271
5.6K
R272
SH253
SHIELD
1 1
C274
0.1uF
27nH
SH250
SHIELD
0.5pF
L262
C256
27nH
15nH
L292
15nH
L281
910
L282
R283
150
7.5pF
1.3%
C267
C272
0.1uF
R284
330
27nH
L276
0
R277
R276
8.2K
NU
220nH
R281
6.8nH
V_SF
L272
TX_INJ
L291
5R
VCO_MOD
PRESC
V_STEER
RX_INJ
V_SF
3V
TRB
Figure 12-19. UHF (438-470 MHz) Voltage Controlled Oscillator Schematic Diagram (8486348Z09-A)