Motorola EP450 Service Manual

11-24 UHF 438-470 MHz Schematic Diagrams, Overlays, and Parts Lists
November 24, 2003 HKLN4216A
Chapter 11 UHF 438-470 MHz Schematic Diagrams, Overlays, and Parts Lists
4.2V
UHF R2 Front End
0.79V
C5
1.3%
7.5pF
C26
390pF
8pF
1.25%
C10
R24
1.5K
C39
1.43%
7pF
0.1uF
C99
R20
5.6K
8.2pF
C44
C36
1%
18pF
C20
390pF
C34
1.5%
6.8pF
C522
0.5pF
4
NU
C46
CR41
HSMS2829
IO1
1
2
IO2
IO3
3
IO4
390pF
C25
R51
L51
150nH
51
C31
1.43%
7pF
9.85nH
2%
L32
L41
27nH
C38
1.2%
8.2pF
1.6%
C3
25
6
3
1
4
6.2pF
UMT1
Q22
C29
1.5%
6.8pF
C11
15pF
C4
1%
16pF
9.85nH
2%
L34
C8
2%
5.1pF
L31
2%
9.85nH
9.85nH
2%
L3
C13
6.7%
1.5pF
680nH
L52
0
C4
8
BFS505
Q21
1
3
2
FE_IF_OUT
C35
1.3%
7.5pF
1
C43
20pF
4
6
3
2
1
TP1
T41
RF BALUN
5
NC
C47
1
TP2
1
SH1
SHIELD
CR1
1
3
2
22nH
L55
1%
16pF
C1
C30
C27
9.1pF
1.1%
C33
7.5pF
1.3%
390pF
20pF
1%
C23
1.5pF
6.7%
C14
C2
8pF
1.25%
C6
9.1pF
1.1%
5.1pF
C521
FE_RF_INJ
R25
5.6K
T42
5
NC
4
6
3
2
1
IF BALUN
NC
L2
2%
9.85nH
L21
22nH
1K
R40
C45
16pF
NC
L33
2%
9.85nH
C7
1%
16pF
FE_5R
0.5pF
C524
R22
5.6K
C32
1.5%
6.8pF
390pF
C21
C28
1%
12pF
SH40
SHIELD
1
C42
16pF
C37
1.3%
7.5pF
9.85nH
2%
L1
C49
NU
L40
27nH
NU
R21
82
C12
82pF
C51
C41
7.5pF
R23
27K
C523
6.7%
0.45pF
C9
1.2%
8.2pF
RX_IN
IF_OUT
RX_INJ
5R
IF1
Figure 11-18. UHF (438-470 MHz) PCB 8486348Z13-C Receiver Front 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)