Motorola EP450 Service Manual

UHF 465-495 MHz PCB 8486634Z02 Schematic Diagrams, Overlays, and Parts Lists 11-43
HKLN4216A November 24, 2003
5V for 25kHz
RX Back End (Overtone)
0V for 12.5kHz
3.39V
3.05V
0.74V
1.5V
2.1V When -47 dBm @ antenna
9.1pF
1.1%
C53
1
2
3
5V
1
2
3
D51
1
3
2
D52
CR51
C71
IF_DEMOD
TC7W04F
1
7
0.1uF
GND1
3
4
GND2
IN
1
OUT
2
U52-1
C69
CFWC455E
FL53
12K
0.1uF
C73
R52
1
IN
2
OUT
4700pF
FL54
CFWC455G
GND1
3
GND2
4
0.1uF
C55
5V
0.1uF
C56
C62
0.1uF
C60
0.1uF
C67
0.1uF
R53
33K
2.4K
Q70
MMBT3904
1
3
2
R60
C80
22pF
1%
C59
2.7pF
R73
1.8K
NC
R74
1.2K
6
2
1.6K
U52-2
TC7W04F
5.1K
R80
R91
PBR941
Q51
1
3
2
C93
3.6pF
C90
0.1uF
NU
C63
L53
120pF
0.1uF
R82
1.2uH
2%
L54
NU
1uH
L81
5V
C52
18pF
4.7K
R57
C66
SH52
SHIELD
1
OUT I N
1
0.1uF
44.395MHz
TSS2_44_395MHZ
Y51
2
GND
4
GND1
3
2
CC1
5
CC2
1
GND1
4
GND2
3
IN
6
OUT
44.85MHz
MXF45
FL51
4
VCC
8
C58
3.9pF
PWR_GND
U52-4
GND
R81
10uF
C91
0.1uF
C65
1K
R75
12K
20K
C57
0.1uF
9180468V04
3
GND
IN
1
OU T
2
R64
FLTR
FL52
C81
1%
33pF
C70
IF_IN
RFIN RFIN_DEC
2 5
RSSIOUT RSSI_FEED
9
6
VCC
130pF
LIMIN
LIMOUT
11 13
LIM_DEC1
12
LIM_DEC2
20
MIXOUT
OSCIN
4 3
OSCOUT
10
QUADIN
1
AUDIOOUT
8 7
AUDIO_FEED
15
GND
18
IFAMPIN
16
IFAMPOUT
IFAMP_DEC1
19 17
IFAMP_DEC2
14
SA616
U5
1
680
R78
R77
1%
8.2K
R67
5V
IF_BAND_SEL
20K
R76
1%
12K
0.1uF
33pF
1%
C82
5.1K
C68
R54
R66
20K
R63
C72
0.1uF
455KHz
3
21
39K
45B02
Y70
5V
IF_RSSI
SH50
SHIELD
1
R55
330
C64
0.1uF
390
R72
39K
R65
3.3K
R61
100K
R62
TC7W04F
U52-3
35
IF_5
V
C92
0.1uF
51
R90
BW_SE L
5V
IF_IN
RSSI
DEMOD
47pF
C61
47pF
C74
Figure 11-32. UHF (465-495 MHz) Receiver Back End Schematic Diagram

Motorola EP450 Specifications

General

Channel Capacity	16 channels
Operating Temperature	-30°C to +60°C
IP Rating	IP54
Frequency Range	VHF: 136-174 MHz, UHF: 403-470 MHz
Weight	Approximately 350g (with standard battery)