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Kenwood Manuals
Transceiver
NEXEDGE NX-820G
Quick start manual
Kenwood NX-820G Quick Start Manual page 73
Uhf digital transceiver
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Also See for NX-820G
:
Instruction manual
(23 pages)
,
Technical details
(2 pages)
,
Instruction manual
(196 pages)
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Contents
Table of Contents
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Table of Contents
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AE
TX-RX UNIT (X57-8240-1X)
THP1
B-BUS
L 1
TEMP
GND1
VCC
GND2 oUTPUT
X 1
L 7 7 -3 0 7 3 -0 5
.
AVR(33C)
.
I C 4 0 9
33C
NJM2878F4-33
R8 25
50M
0
SBC2
D408,409
DC/DC Converter
80C
R4 2 9
0
2SC4738(GR)F
DC Switch(150C)
B-BUS
R 30 3
1 k
IF_DET
S P -
SP +
M I C
ME
B-BUS
AF
SCHEMATIC DIAGRAM
.
L 2
C 3
R 7 2
4 . 7u
1 k
0 . 0 1u
3.3V
13.9V
D4 0 8
D409
DB 2 S 31 0
DB 2 S 3 1 0
150C
R 4 31
Q415,416
0
DC/DC Converter
Q 4 1 5
Q 416
2 S A 18 32( GR ) F
3.3V
20KHz
Q 4 1 4
E M D9
C N 30 2
C 32 2
3.83V
10 0p
L 3 02
L 30 4
C3 1 6
C 3 24
R 3 1 5
5 6 0n
R 3 0 6
33 0 k
0
56n
1 0 p
33p
3
C 3 1 5
1
0. 0 1 u
2
Tripler
0.64V
Q 3 0 3
2 S C5 10 8 (Y )F
.
L 72 -1 0 1 7 -0 5
C307
C313
R3 0 8
R 32 3
IN
o UT
0
0 . 1u
0
0. 1u
CF1
AG
NX-820(G)/820
33C
.
C10
0.01u
.
0.01u
C11
13
CPout
NC_1
6
14
VCCcp
NC_2
5
.
15
LD/PS
NC_3
.
4
PLL System
C 20
16
NC_4
Fin
I C 2
3
1 00 p
17
.
S K Y 72 31 0- 36 2
Fin
NC_5
2
R 1 0
18
NC_6
VCC
1
.
1 0
.
C22
.
L3
0 . 1 u
C 23
.
10 0p
.
C 1 6
10 0p
.
C 17
1 00p
.
C 18
1 00p
C 19
1 00 p
R 43 5
0
CV
.
R 1 3
.
4 7 k
R17
1 00 k
150C
.
C 35 9
0. 01 u
.
FM System
I C 3 03
.
T K 10 931 V TL - G
.
4.71V
C 3 47
C 33 0
1 OSC<B>
RFin
24
0 . 0 1u
2 OSC<E>
0 . 1 u
GND
2 3
3 MIXo
COMPo
2 2
.
4 VCC
COMPi
2 1
C 32 7
R 33 2 0
.
5 AMIFi
NAMPo
2 0
C 33 2 0 . 1 u
.
0. 1 u
.
6 AMIFdecp
.
NAMPi
1 9
R 3 26
C 3 33 0 . 1 u
.
7 FMIFi
C342 1u
AGC
1 8
3 3 0
C 3 34 0 . 1 u
.
8 FMIFdecp1
AGCAMPo
1 7
C 3 35 0 . 1 u
.
9 FMIFdecp2
RFAGCo
16
C 326
10 LIMo
RSSIo
15
1 0p
11 QUADi
AMSW
14
1 2 FMDETo
AMDETo
13
.
C N 3 03
C F 2
.
.
.
L 72 - 1 040 - 0 5
C 33 7
R 337
o U T
I N
0.1u
1 k
G N D
AH
.
C 31
47 p
.
.
.
R 19
R 2 0
R2 4
0
0
3 9 0
.
C25
10 0p
.
R 14
47 k
.
C 2 6
Over Voltage
10 0p
Protection
DC Switch
.
(Assist)
Q2
2 S J 6 4 8 - A
.
R 2 8
1 0 M
.
I C 3
B D 7 54 2F V M
1 oU T 1
VDD
8
2
- +
7
.
3
+
-
6
ASSIST
R 26
4 V S S
5
.
1 k
.
C 28 1 00 p
C 3 0
1 u 25
DC AMP(CV/Assist)
4.54V
C N 304
.
C 3 71
R 35 5
C 36 7
0.93V
.
0 . 0 1u
0
0. 01 u
C 3 6 1
C 34 5 0 . 1 u
.
0 .0 1 u
R 3 42 10 0k
1st IF AMP
.
Q 3 0 5
2 S C 4 2 1 5 - F( Y )
R 3 45
.
0
DC AMP(RSSI)
R 34 4
IC 3 0 4
2. 7k
B U7 4 4 5 HFV
R 35 0
1 I N +
1 0 k
R 3 58
.
2 VSS
R 34 3
33 k
3 I N -
22 k
C351
100p
CN 3 0 6
C 3 43
0. 1u
X57-824 7/10
AI
THP1
FIN
L 5
DC Switch
.
(Assist)
Q1
LTC014EEBFS8
B-BUS
150C
3.30V
VDD
5
oUT
4
S P -
S P +
M I C
ME
B-BUS
73
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