Figure 9.5-16. Pmlf4036B Frequency Generation Unit (Fgu) Schematic - Sheet 2 Of 3 - Motorola XTS 2500 Service Manual

900MHz Schematics, Board Overlays, and Parts Lists
Steering Line
2 to 11 VDC
VCTRL
C269 C270
2.2pF
1pF
C272
L217
2.2pF
100nH
1 C271
2.4pF
D212
Y203
C274
RESONATOR
39pF
2
1025MHz
AUX4
6816985H01-F
C260
2.2pF C262 VSF
DNP
1pF
R229
18K
C263
L215
4.3pF
100nH
C264
1
2.4pF
C265
D211
1.8pF
Y202
C267
RESONATOR
39pF
2
0MHz
C268
2.2pF
VSF
AUX2
C246
R235
.01uF
20K
R234
18K
Q215
C273
1.8pF
R236
22
R237
240
C275
1.8pF
SH203
L218
SHIELD
100nH
C296
39pF
Q214
C245
R232
.01uF
51K
5V
R298
0
DNP
R297
0
L211
0
C224 C253
0.10uF 39pF
R225
33
VSF
14 18
1
R230
TX_IADJ
20K 2
RX_IADJ
3
SUPER_FLTR
4
Q213
COLL_RFIN PRESC_OUT
U250
5
RX_BASE
CD8408DK
6
RX_EMITTER RX_SWITCH
16
TX_BASE TX_SWITCH
15
R231 TX_EMITTER
20
18 FLIP_IN
19
R233
TRB_IN
220
9 11 17
L216
100nH
VCO Select Line
0V for RX
5V
C297
39pF
Q212
R262
5.6K
R227
51K
Q218
AUX3
C247 R261
.01uF 51K
SH205
SHIELD
Figure 9.5-16. PMLF4036B Frequency Generation Unit (FGU) Schematic – Sheet 2 of 3
R220
330
C250
39pF
1
L210
150nH
C251
39pF 2
R222
750
C256 1
39pF L212
150nH
2
C231
33pF
DNP
C261
39pF
L230
10
18nH
TX_OUT
8
RX_OUT
12
7
C266
13
39pF
VSF
R238
150
R239
24K L219
150nH
R289
L220 L221
82
27nH 18nH
Q216
C278
NE68519
39pF 3
2
C279
R241
1.5pF
1 1
0
R292 R243
33 30K
2
Q217
C230
39pF
R244
51K
9.5-17
IF209
RX_LO
PRESC
C276
39pF
C277
39pF
IF210
TX_INJ
C280
2.0pF
TX BUFFER
February 14, 2012