Kenwood NX-720 Service Manual page 94
Vhf digital transceiver
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Also See for NX-720:
- Service manual (90 pages) ,
- Instruction manual (24 pages) ,
- Technical details (2 pages)
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NX-720
Pin
Pin
Signal
I/O
No.
Name
DETO
O
4
Analog
AFO
O
DATAI
I
5
Analog
MI2
I
FNC1/
I/O Digital
TXD
6
TXD
(RS-
O
Digital
232C)
FNC2/
I/O Digital
RXD
7
RXD
(RS-
I
Digital
232C)
FNC3
I/O Digital
8
RTS
(RS-
O
Digital
232C)
FNC4
I/O Digital
9
CTS
(RS-
I
Digital
232C
10
FNC5
I/O Digital
94
TERMINAL FUNCTION
Description
Type
FM detector output
RX Audio output
External Modulation input
External MIC AF Input
Programmable I/O
RS-232C Serial port
(TXD)
Programmable I/O
RS-232C Serial port
(RXD)
Programmable I/O
RS-232C Serial port
(RTS)
Programmable I/O
RS-232C Serial port
(CTS)
Programmable I/O
Item and Condition
Min
Output Level
-
Coupling Capacitor
-
Allowable Load
600
Output Level
-
Coupling Capacitor
-
Allowable Load
600
Input Voltage Range
-
Input Impedance
-
Input Voltage Range
-
Allowable Frequency
300
Input Impedance
-
VIH
4.0
VIL
-0.5
VOH (Io=-1.5mA)
4.0
VOL (Io=1.5mA)
-
Voltage Swing
±5
Baud Rate
1200
CL
VIH
4.0
VIL
-0.5
VOH (Io=-1.5mA)
4.0
VOL (Io=1.5mA)
-
Input Voltage Range
-30
Threshold Low
0.5
Threshold High
-
Baud Rate
1200
VIH
4.0
VIL
-0.5
VOH (Io=-1.5mA)
4.0
VOL (Io=1.5mA)
-
Voltage Swing
±5
VIH
4.0
VOH
-0.5
VOH (Io=-1.5mA)
4.0
VOL (Io=1.5mA)
-
Input Voltage Range
-30
Threshold Low
0.5
Threshold High
-
VIH
4.0
VOH
-0.5
VOH (Io=-1.5mA)
4.0
VOL (Io=1.5mA)
-
Typ
Max
Unit
Note
0.28
-
Vp-p
4.7
-
uF
-
-
0.24
-
Vp-p
4.7
-
uF
-
-
Standard devia-
0.5
1.98
Vp-p
tion
100
-
k
5
-
mVrms
-
3000
Hz
600
-
-
5.2
V
-
1.0
V
-
5.2
V
-
1.1
V
±9
-
V
3k Load
-
19200
bps
100
pF
-
5.2
V
-
1.0
V
-
5.2
V
-
1.1
V
-
30
V
1.3
-
V
1.75
2.6
V
-
19200
bps
-
5.2
V
-
1.0
V
-
5.2
V
-
1.1
V
±9
-
V
3k Load
-
5.2
V
-
1.0
V
-
5.2
V
-
1.1
V
-
30
V
1.3
-
V
1.75
2.6
V
-
5.2
V
-
1.0
V
-
5.2
V
-
1.1
V
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