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Kenwood Manuals
Transceiver
Nexedge NX-720HG
Service manual
Kenwood NX-720H(G) Service Manual page 73
Vhf digital transceiver
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Instruction manual
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Instruction manual
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Contents
Table of Contents
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AE
SCHEMATIC DIAGRAM
TX-RX UNIT (X57-8230-10)
THP1
/T_R
L1
TEMP
GND1
VCC
GND2
oUTPUT
X1
L77-3073-05
C3
0.01u
.
AVR(33C)
.
IC409
NJM2878F4-33
R825
50M
0
SBC2
80C
R429
R431
0
0
DC/DC Converter
Q415
2SC4738(GR)F
DC Switch(150C)
Q414
EMD9
L302
3.80V
560n
C315
R303
1k
0.01u
0.64V
.
C307
0.1u
.
C337
IF_DET
0.1u
SP+
SP-
MIC
ME
POWER
AF
3.31V
.
.
.
L2
R72
4.7u
1k
3.3V
D408,409
DC/DC Converter
D408
D409
DB2S310
DB2S310
13.9V
150C
DC/DC Converter
Q416
2SA1832(GR)F
3.3V
20kHz
CN302
C322
100p
L304
C316
C324
R306
R315
56n
330k
0
10p
33p
3
1
Tripler
2
Q303
2SC5108(Y)F
CF1
L72-1017-05
C313
R323
C327
R308
IN
oUT
0
0.1u
0
0.1u
.
R326
330
.
CN303
CF2
.
.
L72-1040-05
IN
C343
oUT
R337
1k
0.1u
AG
NX-720H(G)/720H
C10
0.01u
0.01u
C11
13
6
CPout
NC_1
5
14
NC_2
VCCcp
.
.
15
4
NC_3
LD/PS
IC2
C20
16
3
SKY72310-362
NC_4
Fin
100p
PLL System
17
.
2
Fin
NC_5
R10
18
1
NC_6
VCC
.
10
.
C22
L3
.
0.1u
C23
.
100p
.
100p
C16
.
C17
100p
.
C18
100p
100p
C19
R435
0
CV
.
R13
47k
100k
DC AMP
(CV/Assist)
.
C359
0.01u
.
FM System
.
IC303
.
TK10931VTL-G
C330
C347
0.1u
1 OSC<B>
RFin
24
0.01u
2 OSC<E>
.
4.70V
GND
23
C345
3 MIXo
COMPo
22
4 VCC
.
21
COMPi
R332
0
5 AMIFi
.
.
NAMPo
20
C332
0.1u
6 AMIFdecp
C342
.
NAMPi
19
C333
0.1u
7 FMIFi
1u
.
AGC
18
C334
0.1u
8 FMIFdecp1
.
AGCAMPo
17
C335
0.1u
9 FMIFdecp2
.
RFAGCo
16
10p
C326
10 LIMo
RSSIo
15
11 QUADi
14
AMSW
12 FMDETo
13
AMDETo
AH
.
C31
100p
.
.
.
R19
R20
R24
0
0
390
.
C24
0.1u
.
C25
100p
.
R14
47k
.
Over Voltage
C26
Protection
100p
.
Q2
2SJ648-A
DC Switch
(Assist)
.
R28
10M
.
IC3
BD7542FVM
1
oUT1
VDD
8
2
- +
7
3
.
+
-
6
R26
ASSIST
4
VSS
5
1k
.
.
C28
100p
C30
1u 25
CN304
4.51V
.
C371
C367
R355
0
0.01u
0.01u
1st IF AMP
C361
0.1u
Q305
.
2SC4215-F(Y)
0.01u
R342
100k
.
R345
0
.
DC AMP(RSSI)
R344
IC304
2.7k
BU7445HFV
R350
5
1
IN+
VDD
10k
R358
.
2
VSS
33k
R343
3
IN-
4
oUT
22k
C351
100p
CN306
X57-823 7/10
AI
THP1
50C
/T_R
33C
FIN
L5
DC Switch
.
(Assist)
Q1
LTC014EEBFS8
150C
B-BUS
0.96V
3.30V
SP+
SP-
MIC
ME
B-BUS
POWER
73
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