Figure 9.3-27. Pmle4427B Vco Schematic - Motorola XTS 2500 Service Manual

9.3-28
4.6VSF_OUT 4.6VSF_VCO
R257
0
C257 C258
0.1uF 330pF
L251
390nH
L252
390nH
C295
100pF
TP291
TEST_POINT
VCTRL
R251
0
C294
NU
L271
390nH
C296
100pF

Figure 9.3-27. PMLE4427B VCO Schematic

February 14, 2012
Rx_SW
R252
10K
R253
15K
C256
11pF
C253
2.7pF
C259
11pF
C254
2.0pF
D252 D251
R258
7.5
L255
11.87nH
C255
10pF
D254 D253
Tx_SW
C280
4.3pF
C281
4.3pF
L270
390nH
C282
4.3pF
C272
4.3pF
D271
D270
L275
8.9nH
C273
D273 D272 4.7pF
TRB
4.6VSF_VCO
L250
R298
R297
390nH
NU
NU
R291
30
R296
0
R299
C251 C250
0.10uF 100pF 0
4.6VSF_VCO 4.6VSF_VCO
Q250
1 10
TX_IADJ TX_OUT
2 8
RX_IADJ RX_OUT
3
SUPER_FLTR
4 12
COLL_RFIN U250 PRESC_OUT
L254
5
CD8408DK
RX_BASE
390nH
6 7
VCOBIC
RX_EMITTER RX_SWITCH
16 13
TX_BASE TX_SWITCH
15
TX_EMITTER
20
FLIP_IN
19
R259
TRB_IN
330
R276
10K
R278
12K
C271
2.0pF
R271
L273
30
390nH
R270
120
4.6VSF_OUT
R254 R255
Q251
270K 1K
R295
10K
UHF2 Schematics, Board Overlays, and Parts Lists
4.6VSF_VCO
R272
200
C277
L276
22pF
22nH
C278
L274
56pF
18nH
C276
R273
5.6pF
200
4.6VSF_VCO
C262
NU
C267
1.2pF L259
47nH
Rx_SW
Tx_SW
L258
27nH
C261
100pF
C263
2.0pF
C292
C293
L266
100pF
100pF
39nH
C266 R266
1pF
NU
1
TP296
TEST_POINT
C286
330pF
TP299
TEST_POINT
R274
20
TXRF_OUT
R275
200
R293
20
RX_LO_IN
R294
330
TP297
TEST_POINT
PRES_IN
6816985H01-F