Figure 7-54. Vhf (146-174 Mhz) Receiver Back End Schematic Diagram (8486769Z04-C) - Motorola CP150 Service Manual

VHF 146-174 MHz Schematic Diagrams, Overlays, and Parts Lists (8486769Z04-C)
500mV (RF)
IF_IN
IF_IN
C52
18pF
1%
6880309N62-C
R61
100K
BW_SEL
5V for 25kHz IF_BAND_SEL
0V for 12.5kHz
5V
3.39V
5V
IF_5V
R91
1.6K
R55
C56
330
0.1uF
R53
550mV (RF)
33K
3.05V
C55 R54
0.1uF
5.1K
320 mV (RF) L53
3
120pF
3 IN OUT 6 1
C57
0.74V 0.1uF
2 CC1 390 mV (RF) 2
C93
5 CC2 Q51
3.6pF PBR941
NU
R52
12K
1 4
FL51
MXF45
C53
44.85MHz
9.1pF
1.1%
SH50 SH52
SHIELD SHIELD
1 1
5 V (12.5 KHz)
0 V (12.5 KHz)
0 V (25KHz)
5V (25KHz)
1 7
R65
U52-1
39K
TC7W04F
C68 FL53
CFWC455E
0.1uF
1 IN OUT 2
5V 0 V (12.5 KHz)
1V (25KHz)
3 4
6 2
U52-2
R63
TC7W04F
39K
FL54
C69 0.33 V
2 CFWC455G
0.1uF
3 1 IN
OUT
1
0 V (25KHz)
D51
1 V (12.5KHz)
R62
3.3K
3 4
R60
2.4K
C62
0.1uF
170 mV (RF)
FL52
FLTR
130 mV (RF)
1 IN OUT 2
C61
68pF
C64
0.1uF
C65
0.1uF
3
9180468V04
110 mV (RF)
5V
VCC
6
R90
51
C90
C91 C92
0.1uF
10uF 0.1uF
C58
3.9pF
L54
C59 R57
2.7pF 1.2uH
4.7K
2%
3
290 mV (RF)
C60
1 2
0.1uF
CR51
R80
C80
5.1K 22pF
C81
1%
33pF
1%
Y51
TSS2_44_395MHZ
R81
R76
1K 44.395MHz
12K
3 1 1%
OUT IN
490 mV (RF)
C82
R82
33pF
NU
L81
1uH

Figure 7-54. VHF (146-174 MHz) Receiver Back End Schematic Diagram (8486769Z04-C)

R66
20K
5V
0 V (12.5 KHz)
8
3
2.8V (25KHz)
VCC
GND
U52-3
TC7W04F
4
U52-4
PWR_GND
R64
20K
1
2.14 V
3
2
2
0 V (25 KHz)
D52
2.8V (12.5KHz) C74
R67
47pF
20K
C63
0.1uF
170 mV (RF)
5V
C67
R72
0.1uF
390
C66
0.1uF
Q70
MMBT3904
3
1.23V
1
2
U51 0.62V
SA616
165mV (RF)
C70
130pF
GND
R73
15
1.8K
R74
1.2K
1 2
Y70
3
45B02
455KHz
C71
0.1uF
RSSI
IF_RSSI
R75
2.1V When -47 dBm @ antenna
12K
C72
0.1uF
DEMOD
R77 R78
IF_DEMOD
8.2K
680
1%
100 mV RMS (25KHz)
50 mV RMS (12.5KHz)
C73
4700pF
7-55
5
NC
June, 2005