Figure 7-135.Huf4017A Receiver Front-End Schematic (Sheet 2 Of 2) - Motorola ASTRO Digital XTL 5000 Detailed Service Manual

7-192
1
2
3
VN_B6255
C6289
L6252
0.1uF
68nH
C6264
0.1uF
U6250
AM50_0011
C6295
L6258
3 6
4 RF_IN RF_OUT
7.5nH
1000pF
C6288
3.9pF
TP6250
LNA Output
5
6
Figure 7-135. HUF4017A Receiver Front-End Schematic (Sheet 2 of 2)
May 25, 2005
C6250
.01uF
R6268
200
9.3V_TO_IF
C6255
.01uF
R6267
1K
L6250
B6252
22nH
C6257
03S10
1 2
OUT IN
.01uF
C6261
.01uF
L6255
1uH
TP6259
C6268
D6254 D6255
.01uF
C6271
R6271
10pF
1K
R6270 TP6261
D6256
1K
C6274
TP6260 .01uF
1
TP6262
B6253
C6276 MD365
2
IN OUT
.01uF
L6260
22nH
C6280
.01uF
R6269
200
C6284
.01uF
Schematics, Component Location Diagrams, and Parts Lists: HUF4017A (700-800 MHz) Main Board
C6251
.01uF
R6272 RX switching voltages
200
C6256
Test points
.01uF
TP6254
L6251
22nH TP6255, 57, 59, 61
C6258
9.3V_TO_IF
TP6256, 58, 60, 62
.01uF
R6275
1K
C6266
.01uF
L6257
1uH
U6251
MA4EX951H-1225
MIXER_RF_IN 1
RF
1 D6257 5
C6272
IF
3
LO
VN_B6258
47pF
TP6251
1
C6277
1
.01uF
L6261
22nH
C6281
.01uF
R6273
200
C6285
.01uF
VN_B6253
IF6250
9.3V_TO_IF
RX Receive RX Receive
700 MHz 800 MHz
0V 3V
7.7V 4.3V
2.3V 7.7V
MIXER_IF_OUT
TP6252
IF6256
R6281
IF_OUT_IF
5.1
*R6279*
C6297
9.1pF
0
R6278 R6280
1.5K 1.5K
Part Series
6200-2
MAEPF-27840-O
6881096C74-B