Figure 9.1-14. Pmld4303A/ Pmld4303D/ Pmld4264B/ Pmld4264E Frequency Generation Unit (Fgu) Schematic - Sheet 2 Of 3 - Motorola XTS 2500 Service Manual

VHF Schematics, Board Overlays, and Parts Lists
C295
.01uF
TP291
TEST_POINT
VCTRL
R251
0
C294
330pF
TRB
6816985H01-F
4.6VSF_OUT 4.6VSF_VCO
C257
0.1uF
C252
12pF
L251
1uH
C254 L253
3.3pF 18.08nH
D251 C253
12pF
L252
L254
1uH
11.87nH
D252
C271
11pF
L270
1uH
C273 L272
1.8pF 39nH
C272
15pF
D270
L273
L271
27nH
1uH
C296
1000pF
R254
270K
R295
10K
Figure 9.1-14. PMLD4303A/ PMLD4303D/ PMLD4264B/ PMLD4264E Frequency Generation Unit (FGU) Schematic – Sheet 2 of 3
4.6VSF_VCO 4.6VSF_VCO
C258 4.6VSF_VCO
4.6VSF_VCO
330pF
R257
R291 R277 10K
33 10K
4.6VSF_VCO
4.6VSF_VCO
C255
1pF
R253
330
R252
1
30 TX_IADJ TX_OUT
2
RX_IADJ RX_OUT
3
SUPER_FLTR
4
COLL_RFIN U250 PRESC_OUT
5
RX_BASE
C256
6
VCOBIC
330pF RX_EMITTER RX_SWITCH
16
TX_BASE TX_SWITCH
15
TX_EMITTER
20
FLIP_IN
19
TRB_IN
C274
1pF
R271
270
R270
33
C275
330pF
4.6VSF_OUT
R255
Q301
1K
TP296
TEST_POINT
1
C286
330pF
4.6VSF_VCO
C277
330pF
R272
200
C279
L274 R274
330pF
33nH 15
C278 C276
R273
5.1pF 0.5pF
470
4.6VSF_VCO
C262
10 330pF
8
12
L259
1uH
7
NC
L258 R293
13
NC 150nH 33
C261
330pF
C263 C267
0.5pF 0.5pF
TP297
C292 C293 TEST_POINT
L266
330pF 330pF
180nH
C266
R266
2.2pF
330
9.1-15
TP299
TEST_POINT
TXRF_OUT
R275
470
TP298
TEST_POINT
RX_LO_IN
R294
330
PRES_IN
February 14, 2012